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Isolated strong-severe thunderstorms with strong gusts and hail will be possible across parts of the High Plains this afternoon and evening, as well as from northeast Indiana into northern Ohio.
← back to overviewSPC AC 221237
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0737 AM CDT Wed Apr 22 2026
Valid 221300Z - 231200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON/EVENING FOR PARTS OF THE HIGH PLAINS/NORTHERN PLAINS…AND FROM NORTHEAST INDIANA INTO NORTHERN OHIO
### SUMMARY
Isolated strong-severe thunderstorms with strong gusts and hail will be possible across parts of the High Plains this afternoon and evening, as well as from northeast Indiana into northern Ohio.
High Plains this afternoon/evening
In response to a shortwave trough digging south-southeastward over BC/AB, a closed low over the Great Basin will evolve into a more open wave and eject northeastward to the northern High Plains by early Thursday. An associated, deep lee cyclone will develop eastward from MT to near the ND/SK border, with a lee trough extending southward into the central/southern High Plains. East of the lee trough, low-level moisture (boundary-layer dewpoints in the 55-60 F range) will spread northward today from TX/OK to KS/NE. Diurnal mixing will likely limit the quality of the moisture farther north into the Dakotas. Thus, a few high-based thunderstorms will be possible this afternoon/evening from NE into SD along the lee trough with deep mixing, where inverted-v profiles will favor strong outflow gusts.
A narrow zone of moderate buoyancy is expected along the dryline from southwest NE and western KS into west TX, where deep-layer vertical shear will be sufficient for supercells. Only limited height falls and a warm elevated mixed layer, in combination with somewhat limited parcel residence times in the dryline circulation, suggest that storm coverage will be isolated at best. There will be a conditional threat for isolated large hail with any sustained storms.
Dakotas tonight
The threat for thunderstorms may increase tonight as a result of ascent preceding the midlevel trough, and a modest increase in low-level moisture with a strengthening low-level jet. Much of the convection will likely be rooted above the surface, but could still produce strong outflow gusts and marginally severe hail.
IN/OH this afternoon/evening
Residual low-level moisture and surface heating along a diffuse baroclinic zone will support thunderstorm development this afternoon from northeast IN into northern OH. Though deep-layer wind profiles will not be particularly strong, relatively cool midlevel temperatures and weak-moderate buoyancy could support marginally severe hail and gusty outflow winds with the strongest storms.
..Thompson/Bentley.. 04/22/2026
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z
Severe thunderstorms will be possible from southern Kansas into southern Minnesota on Thursday. Large hail to very large hail, damaging winds, and a few tornadoes are possible.
← back to overviewSPC AC 220600
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Wed Apr 22 2026
Valid 231200Z - 241200Z
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM SOUTHERN KANSAS INTO SOUTHERN MINNESOTA
### SUMMARY
Severe thunderstorms will be possible from southern Kansas into southern Minnesota on Thursday. Large hail to very large hail, damaging winds, and a few tornadoes are possible.
Synopsis
A shortwave trough will move northeast along the eastern periphery of a western US longwave trough. This shortwave will help maintain a surface cyclone in southern Canada, while a secondary surface low may develop across southern Minnesota late in the period. A secondary shortwave will approach the southern Plains late in the forecast period.
As the shortwave trough lifts northeast, a cold front will accelerate east across the central and northern Plains. Ahead of the surface front southerly winds will support mid 50F dewpoints as far north as northern Minnesota and pockets of 60F dewpoints perhaps as far north as southern-to-central Minnesota.
Central and Northern Plains
Diurnal heating of the moist airmass ahead of the advancing surface front will yield an increasingly unstable atmosphere during the afternoon with the 20260422/00Z HREF showing ensemble mean SBCAPE values approaching 2000 J/kg as far north as the greater Omaha, NE, vicinity by 20Z. Interrogation of forecast soundings ahead of the frontal boundary shows a strong cap stretching from Oklahoma northward into Nebraska and Iowa. This cap does lift during the day in response to increasing large-scale ascent from the approaching trough, but thunderstorm initiation will likely require convergence along the surface front.
This should occur by mid-afternoon anywhere from northeast Kansas into southern Minnesota. Initially, deep-layer shear is not particularly strong across the warm sector, but would still support a combination of multi-cells and supercells. Given the degree of instability and steep midlevel lapse rates, large-to-very-large hail would be possible with any of these initial storms. A tornado or two would also be possible given some low-level curvature in the forecast hodographs associated with at least a modest low-level jet.
As the cold front continues to move east into the moist and unstable airmass, additional thunderstorms should develop along the front, eventually growing upscale into one or more linear systems and a transition to a damaging wind threat. Vertical shear should improve during the late afternoon and evening as the mid-to-upper-level winds respond to the approach trough, yielding a continued tornado threat with any persistent discrete cell.
Oklahoma and Northwest Texas
A very unstable airmass will develop across the region to the east of a dryline across western Oklahoma during the afternoon. Forecast soundings show varying degrees of a cap across Oklahoma and Northwest Texas. With the strongest large-scale ascent remaining largely to the north of the area, forcing for ascent will likely require strong dryline circulations. Given afternoon temperatures in the 90Fs to the west of the dryline, there is at least some potential for dryline circulations to break the cap and initiate at least a couple of storms. Vertical shear profiles will support supercells capable of very large hail. A highly conditional tornado threat could develop with any discrete storm that is able to move off the dryline and into the increasingly moist and unstable environment to the east.
..Marsh.. 04/22/2026
CLICK TO GET WUUS02 PTSDY2 PRODUCT
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z
A few severe thunderstorms will be possible across portions of the Southern Plains into the Lower Mississippi Valley on Saturday. Large hail and damaging wind gusts should be the primary threats.
← back to overviewSPC AC 220721
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0221 AM CDT Wed Apr 22 2026
Valid 241200Z - 251200Z
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE SOUTHERN PLAINS INTO THE LOWER MISSISSIPPI VALLEY
### SUMMARY
A few severe thunderstorms will be possible across portions of the Southern Plains into the Lower Mississippi Valley on Saturday. Large hail and damaging wind gusts should be the primary threats.
Synopsis
A persistent longwave trough will remain situated across the northern US on Friday, maintaining a broad regime of cyclonic midlevel flow over the western two-thirds of the country. Within this broad flow, neutral to modest midlevel height rises are likely across the Southern Plains. This evolution suggests a lack of robust large-scale forcing for ascent, with subtle subsidence potentially acting as a limiting factor for widespread convective coverage.
Southern Plains into the Lower Mississippi Valley
At the start of the forecast period, convective activity may be ongoing across portions of northeast Oklahoma, southeast Kansas, southern Missouri, or northern Arkansas along a consolidated outflow boundary/cold front. These storms should slowly weaken during the morning with the loss of large-scale ascent and a weakening low-level jet. The outflow boundary/cold front should slowly sag south through the morning before stalling somewhere in the vicinity of the I40 corridor. This feature will serve as the primary focus for subsequent development later in the afternoon, with residual outflow or differential heating boundaries being a secondary source of initiation.
South of the frontal boundary, a highly unstable airmass will remain in place across the warm sector. Strong diabatic heating of a moist boundary layer will yield pockets of moderate-to-strong instability, with MUCAPE values potentially in the 2000-3000 J/kg range. While deep-layer shear is forecast to remain relatively modest (30-35 knots), the degree of instability will be sufficient to support robust updrafts.
Given the modest shear and lack of stronger synoptic support, storm modes will likely be multicell clusters or transient supercells. Any persistent cell will be capable of producing large hail and localized damaging wind gusts
Lower Mississippi Valley
Convection that develops across Oklahoma and Arkansas during the afternoon is expected to persist into the evening as it moves slowly east-southeast toward Mississippi and Tennessee. Although instability is not as great with eastward extent, it should remain sufficient enough to support some potential for sporadic wind and hail through the overnight hours.
..Marsh.. 04/22/2026
CLICK TO GET WUUS03 PTSDY3 PRODUCT
NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 1930Z
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, April 25 | 30% |
| Day 5 | Sunday, April 26 | 30% |
| Day 6 | Monday, April 27 | 15% |
| Day 7 | Tuesday, April 28 | predictability too low |
| Day 8 | Wednesday, April 29 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 220900 SPC AC 220900
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0400 AM CDT Wed Apr 22 2026
Valid 251200Z - 301200Z
DISCUSSION
An active severe weather pattern will continue through early next week.
On Saturday/Day-4, model guidance continues to show thunderstorms developing during the late afternoon and early evening hours along a lifting warm front across the Southern Plains. Along and south of this boundary, the environment will be strongly unstable with MUCAPE values between 2000-3000 J/kg as a low-level jet continually advects mid 60Fs dewpoints north across the boundary. Effective layer shear around 40 knots would support an initial supercell threat that should grow upscale into bowing segments overnight. A 30% area is introduced across southwest Kansas into east-central Oklahoma for the expectation is for strong bowing segments to move east-southeast overnight into a strong low-level jet. These storms will be capable of producing strong winds, large hail, and QLCS tornadoes.
On Sunday/Day-5, ongoing convection across southeast Kansas and western Missouri at the start of the period may pose a continued risk of hail and damaging winds, and this convection may persist into mid morning. To the west, continued moist low-level advection will allow for surface dewpoints to rise into the upper 60Fs to low 70Fs across central Oklahoma to the east of a sharp dryline. At the same time, a low-amplitude shortwave should approach the Southern Plains during the late afternoon and evening hours, with a mid-990-millibar surface low developing across northwest Oklahoma along the dryline. The result of this setup will be a volatile atmosphere where MLCAPE values around 4000 J/kg exist within a strongly shear environment (vertical shear nearly 50 knots). Should thunderstorms initiate, a high-end severe weather threat could materialize during the late afternoon and evening hours across central and eastern Oklahoma and southern Kansas. However, global models continue to struggle to develop convection within this environment despite model guidance having modest upward vertical velocities overspreading the dryline. Pattern recognition suggests the need for a 30% severe area for this potential despite the lack of a QPF signal in the global models, and have opted to add one with this forecast. The location of this 30% will likely need to be refined in subsequent outlooks.
The severe threat should continue into Monday/Day-6 across portions of the Lower Mississippi Valley. Strong storms should develop along and ahead of an eastward moving cold front. MUCAPE of 2000-3000 J/kg and 40-knots of deep-layer shear will support supercell thunderstorms capable of all severe hazards. The location, number, and intensity of these supercells will likely be modulated by the events of Sunday. Specifically, if widespread convection does not occur Sunday across the Southern Plains, a more robust reservoir of CAPE/lapse-rates will be available to thunderstorms across the Lower Mississippi Valley on Monday and a higher-end severe potential may develop. This will be monitored in subsequent forecasts.
By Tuesday/Day-7 into Wednesday/Day-8, uncertainty in the severe potential across the southeast increases too much to have confidence in identifying specific locations. Although, as the mesoscale details become cleared in the preceding days, areas may need to be added in subsequent forecasts.
..Marsh.. 04/22/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, April 25 | 30% |
| Day 5 | Sunday, April 26 | 30% |
| Day 6 | Monday, April 27 | 15% |
| Day 7 | Tuesday, April 28 | predictability too low |
| Day 8 | Wednesday, April 29 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 220900 SPC AC 220900
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0400 AM CDT Wed Apr 22 2026
Valid 251200Z - 301200Z
DISCUSSION
An active severe weather pattern will continue through early next week.
On Saturday/Day-4, model guidance continues to show thunderstorms developing during the late afternoon and early evening hours along a lifting warm front across the Southern Plains. Along and south of this boundary, the environment will be strongly unstable with MUCAPE values between 2000-3000 J/kg as a low-level jet continually advects mid 60Fs dewpoints north across the boundary. Effective layer shear around 40 knots would support an initial supercell threat that should grow upscale into bowing segments overnight. A 30% area is introduced across southwest Kansas into east-central Oklahoma for the expectation is for strong bowing segments to move east-southeast overnight into a strong low-level jet. These storms will be capable of producing strong winds, large hail, and QLCS tornadoes.
On Sunday/Day-5, ongoing convection across southeast Kansas and western Missouri at the start of the period may pose a continued risk of hail and damaging winds, and this convection may persist into mid morning. To the west, continued moist low-level advection will allow for surface dewpoints to rise into the upper 60Fs to low 70Fs across central Oklahoma to the east of a sharp dryline. At the same time, a low-amplitude shortwave should approach the Southern Plains during the late afternoon and evening hours, with a mid-990-millibar surface low developing across northwest Oklahoma along the dryline. The result of this setup will be a volatile atmosphere where MLCAPE values around 4000 J/kg exist within a strongly shear environment (vertical shear nearly 50 knots). Should thunderstorms initiate, a high-end severe weather threat could materialize during the late afternoon and evening hours across central and eastern Oklahoma and southern Kansas. However, global models continue to struggle to develop convection within this environment despite model guidance having modest upward vertical velocities overspreading the dryline. Pattern recognition suggests the need for a 30% severe area for this potential despite the lack of a QPF signal in the global models, and have opted to add one with this forecast. The location of this 30% will likely need to be refined in subsequent outlooks.
The severe threat should continue into Monday/Day-6 across portions of the Lower Mississippi Valley. Strong storms should develop along and ahead of an eastward moving cold front. MUCAPE of 2000-3000 J/kg and 40-knots of deep-layer shear will support supercell thunderstorms capable of all severe hazards. The location, number, and intensity of these supercells will likely be modulated by the events of Sunday. Specifically, if widespread convection does not occur Sunday across the Southern Plains, a more robust reservoir of CAPE/lapse-rates will be available to thunderstorms across the Lower Mississippi Valley on Monday and a higher-end severe potential may develop. This will be monitored in subsequent forecasts.
By Tuesday/Day-7 into Wednesday/Day-8, uncertainty in the severe potential across the southeast increases too much to have confidence in identifying specific locations. Although, as the mesoscale details become cleared in the preceding days, areas may need to be added in subsequent forecasts.
..Marsh.. 04/22/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, April 25 | 30% |
| Day 5 | Sunday, April 26 | 30% |
| Day 6 | Monday, April 27 | 15% |
| Day 7 | Tuesday, April 28 | predictability too low |
| Day 8 | Wednesday, April 29 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 220900 SPC AC 220900
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0400 AM CDT Wed Apr 22 2026
Valid 251200Z - 301200Z
DISCUSSION
An active severe weather pattern will continue through early next week.
On Saturday/Day-4, model guidance continues to show thunderstorms developing during the late afternoon and early evening hours along a lifting warm front across the Southern Plains. Along and south of this boundary, the environment will be strongly unstable with MUCAPE values between 2000-3000 J/kg as a low-level jet continually advects mid 60Fs dewpoints north across the boundary. Effective layer shear around 40 knots would support an initial supercell threat that should grow upscale into bowing segments overnight. A 30% area is introduced across southwest Kansas into east-central Oklahoma for the expectation is for strong bowing segments to move east-southeast overnight into a strong low-level jet. These storms will be capable of producing strong winds, large hail, and QLCS tornadoes.
On Sunday/Day-5, ongoing convection across southeast Kansas and western Missouri at the start of the period may pose a continued risk of hail and damaging winds, and this convection may persist into mid morning. To the west, continued moist low-level advection will allow for surface dewpoints to rise into the upper 60Fs to low 70Fs across central Oklahoma to the east of a sharp dryline. At the same time, a low-amplitude shortwave should approach the Southern Plains during the late afternoon and evening hours, with a mid-990-millibar surface low developing across northwest Oklahoma along the dryline. The result of this setup will be a volatile atmosphere where MLCAPE values around 4000 J/kg exist within a strongly shear environment (vertical shear nearly 50 knots). Should thunderstorms initiate, a high-end severe weather threat could materialize during the late afternoon and evening hours across central and eastern Oklahoma and southern Kansas. However, global models continue to struggle to develop convection within this environment despite model guidance having modest upward vertical velocities overspreading the dryline. Pattern recognition suggests the need for a 30% severe area for this potential despite the lack of a QPF signal in the global models, and have opted to add one with this forecast. The location of this 30% will likely need to be refined in subsequent outlooks.
The severe threat should continue into Monday/Day-6 across portions of the Lower Mississippi Valley. Strong storms should develop along and ahead of an eastward moving cold front. MUCAPE of 2000-3000 J/kg and 40-knots of deep-layer shear will support supercell thunderstorms capable of all severe hazards. The location, number, and intensity of these supercells will likely be modulated by the events of Sunday. Specifically, if widespread convection does not occur Sunday across the Southern Plains, a more robust reservoir of CAPE/lapse-rates will be available to thunderstorms across the Lower Mississippi Valley on Monday and a higher-end severe potential may develop. This will be monitored in subsequent forecasts.
By Tuesday/Day-7 into Wednesday/Day-8, uncertainty in the severe potential across the southeast increases too much to have confidence in identifying specific locations. Although, as the mesoscale details become cleared in the preceding days, areas may need to be added in subsequent forecasts.
..Marsh.. 04/22/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, April 25 | 30% |
| Day 5 | Sunday, April 26 | 30% |
| Day 6 | Monday, April 27 | 15% |
| Day 7 | Tuesday, April 28 | predictability too low |
| Day 8 | Wednesday, April 29 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 220900 SPC AC 220900
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0400 AM CDT Wed Apr 22 2026
Valid 251200Z - 301200Z
DISCUSSION
An active severe weather pattern will continue through early next week.
On Saturday/Day-4, model guidance continues to show thunderstorms developing during the late afternoon and early evening hours along a lifting warm front across the Southern Plains. Along and south of this boundary, the environment will be strongly unstable with MUCAPE values between 2000-3000 J/kg as a low-level jet continually advects mid 60Fs dewpoints north across the boundary. Effective layer shear around 40 knots would support an initial supercell threat that should grow upscale into bowing segments overnight. A 30% area is introduced across southwest Kansas into east-central Oklahoma for the expectation is for strong bowing segments to move east-southeast overnight into a strong low-level jet. These storms will be capable of producing strong winds, large hail, and QLCS tornadoes.
On Sunday/Day-5, ongoing convection across southeast Kansas and western Missouri at the start of the period may pose a continued risk of hail and damaging winds, and this convection may persist into mid morning. To the west, continued moist low-level advection will allow for surface dewpoints to rise into the upper 60Fs to low 70Fs across central Oklahoma to the east of a sharp dryline. At the same time, a low-amplitude shortwave should approach the Southern Plains during the late afternoon and evening hours, with a mid-990-millibar surface low developing across northwest Oklahoma along the dryline. The result of this setup will be a volatile atmosphere where MLCAPE values around 4000 J/kg exist within a strongly shear environment (vertical shear nearly 50 knots). Should thunderstorms initiate, a high-end severe weather threat could materialize during the late afternoon and evening hours across central and eastern Oklahoma and southern Kansas. However, global models continue to struggle to develop convection within this environment despite model guidance having modest upward vertical velocities overspreading the dryline. Pattern recognition suggests the need for a 30% severe area for this potential despite the lack of a QPF signal in the global models, and have opted to add one with this forecast. The location of this 30% will likely need to be refined in subsequent outlooks.
The severe threat should continue into Monday/Day-6 across portions of the Lower Mississippi Valley. Strong storms should develop along and ahead of an eastward moving cold front. MUCAPE of 2000-3000 J/kg and 40-knots of deep-layer shear will support supercell thunderstorms capable of all severe hazards. The location, number, and intensity of these supercells will likely be modulated by the events of Sunday. Specifically, if widespread convection does not occur Sunday across the Southern Plains, a more robust reservoir of CAPE/lapse-rates will be available to thunderstorms across the Lower Mississippi Valley on Monday and a higher-end severe potential may develop. This will be monitored in subsequent forecasts.
By Tuesday/Day-7 into Wednesday/Day-8, uncertainty in the severe potential across the southeast increases too much to have confidence in identifying specific locations. Although, as the mesoscale details become cleared in the preceding days, areas may need to be added in subsequent forecasts.
..Marsh.. 04/22/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Saturday, April 25 | 30% |
| Day 5 | Sunday, April 26 | 30% |
| Day 6 | Monday, April 27 | 15% |
| Day 7 | Tuesday, April 28 | predictability too low |
| Day 8 | Wednesday, April 29 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 220900 SPC AC 220900
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0400 AM CDT Wed Apr 22 2026
Valid 251200Z - 301200Z
DISCUSSION
An active severe weather pattern will continue through early next week.
On Saturday/Day-4, model guidance continues to show thunderstorms developing during the late afternoon and early evening hours along a lifting warm front across the Southern Plains. Along and south of this boundary, the environment will be strongly unstable with MUCAPE values between 2000-3000 J/kg as a low-level jet continually advects mid 60Fs dewpoints north across the boundary. Effective layer shear around 40 knots would support an initial supercell threat that should grow upscale into bowing segments overnight. A 30% area is introduced across southwest Kansas into east-central Oklahoma for the expectation is for strong bowing segments to move east-southeast overnight into a strong low-level jet. These storms will be capable of producing strong winds, large hail, and QLCS tornadoes.
On Sunday/Day-5, ongoing convection across southeast Kansas and western Missouri at the start of the period may pose a continued risk of hail and damaging winds, and this convection may persist into mid morning. To the west, continued moist low-level advection will allow for surface dewpoints to rise into the upper 60Fs to low 70Fs across central Oklahoma to the east of a sharp dryline. At the same time, a low-amplitude shortwave should approach the Southern Plains during the late afternoon and evening hours, with a mid-990-millibar surface low developing across northwest Oklahoma along the dryline. The result of this setup will be a volatile atmosphere where MLCAPE values around 4000 J/kg exist within a strongly shear environment (vertical shear nearly 50 knots). Should thunderstorms initiate, a high-end severe weather threat could materialize during the late afternoon and evening hours across central and eastern Oklahoma and southern Kansas. However, global models continue to struggle to develop convection within this environment despite model guidance having modest upward vertical velocities overspreading the dryline. Pattern recognition suggests the need for a 30% severe area for this potential despite the lack of a QPF signal in the global models, and have opted to add one with this forecast. The location of this 30% will likely need to be refined in subsequent outlooks.
The severe threat should continue into Monday/Day-6 across portions of the Lower Mississippi Valley. Strong storms should develop along and ahead of an eastward moving cold front. MUCAPE of 2000-3000 J/kg and 40-knots of deep-layer shear will support supercell thunderstorms capable of all severe hazards. The location, number, and intensity of these supercells will likely be modulated by the events of Sunday. Specifically, if widespread convection does not occur Sunday across the Southern Plains, a more robust reservoir of CAPE/lapse-rates will be available to thunderstorms across the Lower Mississippi Valley on Monday and a higher-end severe potential may develop. This will be monitored in subsequent forecasts.
By Tuesday/Day-7 into Wednesday/Day-8, uncertainty in the severe potential across the southeast increases too much to have confidence in identifying specific locations. Although, as the mesoscale details become cleared in the preceding days, areas may need to be added in subsequent forecasts.
..Marsh.. 04/22/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
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