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Thunderstorms with isolated severe wind gusts and perhaps a tornado or two are possible today across parts of the mid Mississippi and Ohio Valleys. Additional storms with isolated severe wind gusts will be possible in parts of the southern Plains.
← back to overviewSPC AC 150532
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1232 AM CDT Thu Oct 15 2026
Valid 151200Z - 161200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE MID MISSISSIPPI VALLEY INTO THE OHIO VALLEY…AND OVER PARTS OF THE SOUTHERN PLAINS
### SUMMARY
Thunderstorms with isolated severe wind gusts and perhaps a tornado or two are possible today across parts of the mid Mississippi and Ohio Valleys. Additional storms with isolated severe wind gusts will be possible in parts of the southern Plains.
Mid Mississippi and Ohio Valleys
At mid-levels, a ridge will move eastward today into the Northeast, as a large-scale trough moves into the Great Plains. Ahead of the trough, a surface low will track northeastward from the mid Mississippi Valley into the southwestern Great Lakes. Ahead of the surface low, a warm front will move northward through the Ohio Valley. To the south of the warm front, surface dewpoints will be in the upper 60s and lower 70s F. This will enable an axis of instability to develop by afternoon, with MLCAPE likely peaking around 1000 J/kg. Ahead of the trough, a mid-level jet will overspread the warm sector during the afternoon. This will create moderate deep-layer shear over much of the Ohio Valley, which will support isolated supercell development. In addition, RAP forecast soundings in the Ohio Valley by mid afternoon have 0-3 km storm-relative helicity in the 200 to 250 m2/s2 range suggesting that a tornado or two will be possible. Short line segments capable of isolated severe wind gusts will also be possible. Poor lapse rates will be the main limiting factor for a greater severe threat coverage and magnitude.
Southern Plains
An upper-level trough will move into the Great Plains today, as mid-level flow remains southwesterly ahead of the trough. At the surface, a cold front will advance southward across the southern Plains, with the front located from west-central Texas into southeast Oklahoma by afternoon. Although large-scale ascent will be weak, low-level convergence along and near the front will result in thunderstorm development. Storms will move east-southeastward across a narrow corridor of instability, where MLCAPE is forecast to peak in the 1000 to 1500 J/kg range. As low-level lapse rates steepen in the afternoon, isolated severe wind gusts will be possible with multicells. However, deep-layer shear will be marginal for organized convection, and poor lapse rates will be a major limiting factor.
..Broyles/Chalmers.. 10/15/2026
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z
Scattered severe storms capable of damaging wind gusts and perhaps a brief tornado or two are possible in parts of the Mid-Atlantic Friday afternoon and evening.
← back to overviewSPC AC 150523
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1223 AM CDT Thu Oct 15 2026
Valid 161200Z - 171200Z
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER A PORTION OF THE MID-ATLANTIC
### SUMMARY
Scattered severe storms capable of damaging wind gusts and perhaps a brief tornado or two are possible in parts of the Mid-Atlantic Friday afternoon and evening.
Synopsis
The models continue to slow the progression of an intense midlevel trough, which will track through the Mississippi Valley and Great Lakes toward the Appalachians by early Saturday. An attending belt of strong, southwesterly mid/upper-level flow (e.g., 70-90 kt at 500 mb) will precede the trough, the eastern edge of which will overspread the Mid-Atlantic on Saturday. In the low levels, a surface cyclone will develop from the lower Great Lakes into the Gulf of St. Lawrence, while a trailing cold front advances from the lower Great Lakes/upper-Ohio Valley regions Friday morning to off the Mid-Atlantic Coast by Friday night.
### Mid-Atlantic
Showers and thunderstorms may be ongoing at 12Z Friday from northern PA and NY into New England, with lingering clouds and decreasing boundary-layer moisture with northward extent limiting air mass destabilization in the vicinity of the surface low. Farther south ahead of the cold front, greater diabatic heating will combine with dewpoints in the 60s to around 70 F to yield MLCAPE approaching 500-750 J/kg by mid afternoon. Overall CAPE depth and magnitude will be limited by warm temperatures aloft on the anticyclonic side of the upper-level jet streak.
Renewed thunderstorm development is anticipated by late morning or early afternoon along the front over eastern OH and WV into western parts of PA and NY. An increase in storm coverage and intensity is expected through the remainder of the afternoon as the front encounters a more unstable air mass with eastward extent. Vertical shear will be strong with effective bulk shear magnitudes of 45-55 kt, suggesting the potential for embedded supercells and/or bowing structures within the line. Damaging wind gusts will be the primary hazard, though a brief tornado or two appear possible in the Delaware River Valley and Delmarva, where locally stronger low-level shear is forecast during the late afternoon into early evening.
An upgrade to Level-2/Slight Risk has been included with this forecast update to highlight the area where the most favorable overlap of instability and vertical shear is forecast from mid afternoon into early evening.
..Mead.. 10/15/2026
CLICK TO GET WUUS02 PTSDY2 PRODUCT
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z
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, October 17 | potential too low |
| Day 5 | Sunday, October 18 | potential too low |
| Day 6 | Monday, October 19 | potential too low |
| Day 7 | Tuesday, October 20 | predictability too low |
| Day 8 | Wednesday, October 21 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 140825 SPC AC 140825
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Wed Oct 14 2026
Valid 171200Z - 221200Z
DISCUSSION
Days 4 through 6/Saturday through Monday
An intense midlevel trough will move off the Atlantic Coast early on Day 4/Saturday in response to strong zonal flow developing along the U.S./Canadian border. Elsewhere, an upper low off the Baja Coast will weaken while accelerating through the Southwest into the Great Plains. In the low levels, a drier and more stable air mass is expected to limit severe weather potential through at least Monday.
### Days 7 and 8/Tuesday and Wednesday
There is good model agreement that a midlevel trough will move inland from the Pacific Coast. Meanwhile, an associated deepening of a lee surface trough is expected over the High Plains, which in turn will promote the poleward flux of an increasingly moist air mass from the Gulf into the Great Plains. An isolated severe weather threat could materialize by as early as Tuesday in the lower-Colorado Valley, where strengthening vertical shear and forcing for ascent overspread a marginally unstable environment. Uncertainty remains in how quickly the midlevel trough will move through the Interior West; however, it does appear that severe weather potential may increase over the central U.S. by Wednesday or Thursday of next week.
..Mead.. 10/14/2026
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, October 17 | potential too low |
| Day 5 | Sunday, October 18 | potential too low |
| Day 6 | Monday, October 19 | potential too low |
| Day 7 | Tuesday, October 20 | predictability too low |
| Day 8 | Wednesday, October 21 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 140825 SPC AC 140825
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Wed Oct 14 2026
Valid 171200Z - 221200Z
DISCUSSION
Days 4 through 6/Saturday through Monday
An intense midlevel trough will move off the Atlantic Coast early on Day 4/Saturday in response to strong zonal flow developing along the U.S./Canadian border. Elsewhere, an upper low off the Baja Coast will weaken while accelerating through the Southwest into the Great Plains. In the low levels, a drier and more stable air mass is expected to limit severe weather potential through at least Monday.
### Days 7 and 8/Tuesday and Wednesday
There is good model agreement that a midlevel trough will move inland from the Pacific Coast. Meanwhile, an associated deepening of a lee surface trough is expected over the High Plains, which in turn will promote the poleward flux of an increasingly moist air mass from the Gulf into the Great Plains. An isolated severe weather threat could materialize by as early as Tuesday in the lower-Colorado Valley, where strengthening vertical shear and forcing for ascent overspread a marginally unstable environment. Uncertainty remains in how quickly the midlevel trough will move through the Interior West; however, it does appear that severe weather potential may increase over the central U.S. by Wednesday or Thursday of next week.
..Mead.. 10/14/2026
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, October 17 | potential too low |
| Day 5 | Sunday, October 18 | potential too low |
| Day 6 | Monday, October 19 | potential too low |
| Day 7 | Tuesday, October 20 | predictability too low |
| Day 8 | Wednesday, October 21 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 140825 SPC AC 140825
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Wed Oct 14 2026
Valid 171200Z - 221200Z
DISCUSSION
Days 4 through 6/Saturday through Monday
An intense midlevel trough will move off the Atlantic Coast early on Day 4/Saturday in response to strong zonal flow developing along the U.S./Canadian border. Elsewhere, an upper low off the Baja Coast will weaken while accelerating through the Southwest into the Great Plains. In the low levels, a drier and more stable air mass is expected to limit severe weather potential through at least Monday.
### Days 7 and 8/Tuesday and Wednesday
There is good model agreement that a midlevel trough will move inland from the Pacific Coast. Meanwhile, an associated deepening of a lee surface trough is expected over the High Plains, which in turn will promote the poleward flux of an increasingly moist air mass from the Gulf into the Great Plains. An isolated severe weather threat could materialize by as early as Tuesday in the lower-Colorado Valley, where strengthening vertical shear and forcing for ascent overspread a marginally unstable environment. Uncertainty remains in how quickly the midlevel trough will move through the Interior West; however, it does appear that severe weather potential may increase over the central U.S. by Wednesday or Thursday of next week.
..Mead.. 10/14/2026
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, October 17 | potential too low |
| Day 5 | Sunday, October 18 | potential too low |
| Day 6 | Monday, October 19 | potential too low |
| Day 7 | Tuesday, October 20 | predictability too low |
| Day 8 | Wednesday, October 21 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 140825 SPC AC 140825
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Wed Oct 14 2026
Valid 171200Z - 221200Z
DISCUSSION
Days 4 through 6/Saturday through Monday
An intense midlevel trough will move off the Atlantic Coast early on Day 4/Saturday in response to strong zonal flow developing along the U.S./Canadian border. Elsewhere, an upper low off the Baja Coast will weaken while accelerating through the Southwest into the Great Plains. In the low levels, a drier and more stable air mass is expected to limit severe weather potential through at least Monday.
### Days 7 and 8/Tuesday and Wednesday
There is good model agreement that a midlevel trough will move inland from the Pacific Coast. Meanwhile, an associated deepening of a lee surface trough is expected over the High Plains, which in turn will promote the poleward flux of an increasingly moist air mass from the Gulf into the Great Plains. An isolated severe weather threat could materialize by as early as Tuesday in the lower-Colorado Valley, where strengthening vertical shear and forcing for ascent overspread a marginally unstable environment. Uncertainty remains in how quickly the midlevel trough will move through the Interior West; however, it does appear that severe weather potential may increase over the central U.S. by Wednesday or Thursday of next week.
..Mead.. 10/14/2026
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, October 17 | potential too low |
| Day 5 | Sunday, October 18 | potential too low |
| Day 6 | Monday, October 19 | potential too low |
| Day 7 | Tuesday, October 20 | predictability too low |
| Day 8 | Wednesday, October 21 | predictability too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 140825 SPC AC 140825
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0325 AM CDT Wed Oct 14 2026
Valid 171200Z - 221200Z
DISCUSSION
Days 4 through 6/Saturday through Monday
An intense midlevel trough will move off the Atlantic Coast early on Day 4/Saturday in response to strong zonal flow developing along the U.S./Canadian border. Elsewhere, an upper low off the Baja Coast will weaken while accelerating through the Southwest into the Great Plains. In the low levels, a drier and more stable air mass is expected to limit severe weather potential through at least Monday.
### Days 7 and 8/Tuesday and Wednesday
There is good model agreement that a midlevel trough will move inland from the Pacific Coast. Meanwhile, an associated deepening of a lee surface trough is expected over the High Plains, which in turn will promote the poleward flux of an increasingly moist air mass from the Gulf into the Great Plains. An isolated severe weather threat could materialize by as early as Tuesday in the lower-Colorado Valley, where strengthening vertical shear and forcing for ascent overspread a marginally unstable environment. Uncertainty remains in how quickly the midlevel trough will move through the Interior West; however, it does appear that severe weather potential may increase over the central U.S. by Wednesday or Thursday of next week.
..Mead.. 10/14/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
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