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Widely scattered strong to severe storms may impact a corridor from south of the Texas Big Bend into the Gulf coast states and southern Georgia/South Carolina Wednesday afternoon into evening. Additional strong storms are expected across the central Appalachians and southern Mid-Atlantic.
← back to overviewSPC AC 290453
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1153 PM CDT Tue Apr 28 2026
Valid 291200Z - 301200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF TEXAS AND THE GULF COAST STATES INTO SOUTHERN GEORGIA AND SOUTH CAROLINAS…AND ACROSS THE CENTRAL APPALACHIANS/SOUTHERN MID-ATLANTIC
### SUMMARY
Widely scattered strong to severe storms may impact a corridor from south of the Texas Big Bend into the Gulf coast states and southern Georgia/South Carolina Wednesday afternoon into evening. Additional strong storms are expected across the central Appalachians and southern Mid-Atlantic.
Synopsis
An upper trough will pivot across the Great Lakes and Midwest today. Within southern stream flow, a weak shortwave impulse will migrate through westerly flow aloft from Texas to the GA/SC coast. This will result in enhanced westerly flow across the southern U.S. and the Midwest to the Mid-Atlantic. At the surface, a cold front is forecast to extend from northern IN southwestward into central TX this morning. This front will develop southward across TX and southeastward across the Lower MS Valley and Southeast through the period. The northern extent of the front will shift east across the Midwest to the Mid-Atlantic. This surface boundary will be a focus for strong to severe thunderstorm development during the afternoon/evening.
TX to GA/SC Coast
A moist airmass will be in place ahead of the surface front, particularly across TX where dewpoints in the 70s are common. Heating into the 80s and 90 of this very moist airmass will result in a corridor of moderate to strong MLCAPE. The surface boundary will be the main forcing mechanism for convection across TX and storm coverage may remain isolated. Further east into the Lower MS Valley/Southeast, a shortwave impulse will provide modest forcing for ascent in addition to the southeast sagging cold front.
Isolated supercells across central TX will pose a risk for large hail, with some potential for 2+ inch hail. Uncertainty concerning storm coverage and capping across TX precludes an upgrade to Sight risk at this time. Additional storms are expected to develop closer to the Sabine Valley and Lower MS Valley this afternoon. Initial thunderstorm clusters may congeal into one or more linear segment and move across MS/AL/GA during the late afternoon into evening hours. Hail and strong wind gusts will be possible with this activity.
Central Appalachians/Mid-Atlantic vicinity
An upper shortwave trough emanating from the Great Lakes/Midwest upper trough will overspread the region during the afternoon/evening in tandem with the eastward advancing cold front. Modest boundary layer moisture is forecast across the region, with dewpoints generally in the 50s to near 60 F. Modest heating will result in weak destabilization (generally 500-750 J/kg or less). Despite weak instability, supercell wind profiles are evident in forecast soundings. This should aid in at least transient organization of stronger updrafts with a wind and hail risk. While instability and moisture will be marginal, 0-1 SRH will approach 150 m2/s2 in proximity to a weak surface low and a brief tornado could also occur.
..Leitman/Moore.. 04/29/2026
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z
A couple of strong storms may impact the Rio Grande River vicinity near the Texas Big Bend late Thursday afternoon and evening, perhaps accompanied by at least some risk for severe hail.
← back to overviewSPC AC 290452
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1152 PM CDT Tue Apr 28 2026
Valid 301200Z - 011200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS LATE THURSDAY AFTERNOON AND EVENING ACROSS PARTS OF THE RIO GRANDE NEAR THE TEXAS BIG BEND
### SUMMARY
A couple of strong storms may impact the Rio Grande River vicinity near the Texas Big Bend late Thursday afternoon and evening, perhaps accompanied by at least some risk for severe hail.
Discussion
It still appears that an elongated area of lower mid-level heights will continue a slow east-southeastward progression across much of the upper Mississippi Valley through northern Atlantic Seaboard, with an embedded cyclonic circulation redeveloping southeastward through the Great Lakes region. In its wake, split westerlies likely will remain confluent across and east of the Rockies, as a short wave perturbation emerges from the subtropical eastern Pacific.
There appears a much better consensus within latest model output concerning the inland progression of this perturbation, which is now generally forecast to accelerate across northern Mexico and adjacent portions of the U.S. Southwest, toward the Texas Big Bend vicinity Thursday through Thursday night. Downstream short wave ridging is forecast to gradually shift east of the southern Rockies, across the southern Great Plains through Gulf Coast, while subtropical ridging centered across southern Mexico undergoes further suppression.
In lower levels, to the east of the Rockies, cool surface ridging will be maintained across much of the Great Plains and Mississippi Valley into Southeast. Most guidance now indicates that the frontal zone on the leading edge of this air mass will make slow, but steady, southward progress into and across the Texas Big Bend and Hill Country, immediate upper Texas/Louisiana coastal vicinity, and northern Florida.
Forcing for ascent associated with lower/mid-tropospheric warm advection, downstream of the approaching subtropical perturbation, may contribute to multiple rounds of thunderstorm development above the stable surface-based air across parts of the Permian Basin and Texas South Plains through much of central Texas by late Thursday night. Based on latest model output, including Rapid Refresh and NAM forecast soundings, thermodynamic profiles seem unlikely to support severe hail. One exception might develop within moist upslope flow into a more strongly heated environment across the higher terrain near and south of the Texas Big Bend. Beneath moderate to strong mid-level flow, the initiation of a couple of supercells appears possible. However, this activity is expected to weaken as it acquires less unstable updraft inflow to the east of the higher terrain.
Otherwise, the front might provide a general focus for widely scattered thunderstorm activity near the Gulf coast vicinity, while destabilization beneath cool mid-level air across the Great Basin into southern Rockies supports scattered, mostly diurnal thunderstorm activity.
..Kerr.. 04/29/2026
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 | Friday, May 1 | potential too low |
| Day 5 | Saturday, May 2 | potential too low |
| Day 6 | Sunday, May 3 | potential too low |
| Day 7 | Monday, May 4 | potential too low |
| Day 8 | Tuesday, May 5 | potential too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 280923 SPC AC 280923
Day 4-8 Convective Outlook RESENT 1 NWS Storm Prediction Center Norman OK 0423 AM CDT Tue Apr 28 2026
Valid 011200Z - 061200Z
DISCUSSION
Medium-range guidance indicates that the evolving split flow may maintain a broadly confluent mid-level regime across and east of the Rockies through this period. While a broad area of lower mid-level heights remains centered across the Ontario/Quebec and Upper Midwest through Northeast, it appears that a more prominent blocking ridge/high may evolve upstream near the British Columbia/Pacific Northwest coast by late this coming weekend into early next week. A developing low to its southeast may slowly progress inland across California into the Southwest, with downstream mid-level ridging building across the Rockies.
There is considerable model spread concerning embedded short wave developments, but it appears that potential for stronger convection will remain generally low for the time of year and confined to parts of the southern tier of the U.S., perhaps including parts of the San Joaquin Valley, as well as along a lingering frontal zone near or just south of the Gulf into southern Atlantic coastal plain. Due to a combination of low predictability and low severe weather potential, severe weather probabilities are being maintained at less than 15 percent through this period.
..Kerr.. 04/28/2026
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 | Friday, May 1 | potential too low |
| Day 5 | Saturday, May 2 | potential too low |
| Day 6 | Sunday, May 3 | potential too low |
| Day 7 | Monday, May 4 | potential too low |
| Day 8 | Tuesday, May 5 | potential too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 280923 SPC AC 280923
Day 4-8 Convective Outlook RESENT 1 NWS Storm Prediction Center Norman OK 0423 AM CDT Tue Apr 28 2026
Valid 011200Z - 061200Z
DISCUSSION
Medium-range guidance indicates that the evolving split flow may maintain a broadly confluent mid-level regime across and east of the Rockies through this period. While a broad area of lower mid-level heights remains centered across the Ontario/Quebec and Upper Midwest through Northeast, it appears that a more prominent blocking ridge/high may evolve upstream near the British Columbia/Pacific Northwest coast by late this coming weekend into early next week. A developing low to its southeast may slowly progress inland across California into the Southwest, with downstream mid-level ridging building across the Rockies.
There is considerable model spread concerning embedded short wave developments, but it appears that potential for stronger convection will remain generally low for the time of year and confined to parts of the southern tier of the U.S., perhaps including parts of the San Joaquin Valley, as well as along a lingering frontal zone near or just south of the Gulf into southern Atlantic coastal plain. Due to a combination of low predictability and low severe weather potential, severe weather probabilities are being maintained at less than 15 percent through this period.
..Kerr.. 04/28/2026
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 | Friday, May 1 | potential too low |
| Day 5 | Saturday, May 2 | potential too low |
| Day 6 | Sunday, May 3 | potential too low |
| Day 7 | Monday, May 4 | potential too low |
| Day 8 | Tuesday, May 5 | potential too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 280923 SPC AC 280923
Day 4-8 Convective Outlook RESENT 1 NWS Storm Prediction Center Norman OK 0423 AM CDT Tue Apr 28 2026
Valid 011200Z - 061200Z
DISCUSSION
Medium-range guidance indicates that the evolving split flow may maintain a broadly confluent mid-level regime across and east of the Rockies through this period. While a broad area of lower mid-level heights remains centered across the Ontario/Quebec and Upper Midwest through Northeast, it appears that a more prominent blocking ridge/high may evolve upstream near the British Columbia/Pacific Northwest coast by late this coming weekend into early next week. A developing low to its southeast may slowly progress inland across California into the Southwest, with downstream mid-level ridging building across the Rockies.
There is considerable model spread concerning embedded short wave developments, but it appears that potential for stronger convection will remain generally low for the time of year and confined to parts of the southern tier of the U.S., perhaps including parts of the San Joaquin Valley, as well as along a lingering frontal zone near or just south of the Gulf into southern Atlantic coastal plain. Due to a combination of low predictability and low severe weather potential, severe weather probabilities are being maintained at less than 15 percent through this period.
..Kerr.. 04/28/2026
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 | Friday, May 1 | potential too low |
| Day 5 | Saturday, May 2 | potential too low |
| Day 6 | Sunday, May 3 | potential too low |
| Day 7 | Monday, May 4 | potential too low |
| Day 8 | Tuesday, May 5 | potential too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 280923 SPC AC 280923
Day 4-8 Convective Outlook RESENT 1 NWS Storm Prediction Center Norman OK 0423 AM CDT Tue Apr 28 2026
Valid 011200Z - 061200Z
DISCUSSION
Medium-range guidance indicates that the evolving split flow may maintain a broadly confluent mid-level regime across and east of the Rockies through this period. While a broad area of lower mid-level heights remains centered across the Ontario/Quebec and Upper Midwest through Northeast, it appears that a more prominent blocking ridge/high may evolve upstream near the British Columbia/Pacific Northwest coast by late this coming weekend into early next week. A developing low to its southeast may slowly progress inland across California into the Southwest, with downstream mid-level ridging building across the Rockies.
There is considerable model spread concerning embedded short wave developments, but it appears that potential for stronger convection will remain generally low for the time of year and confined to parts of the southern tier of the U.S., perhaps including parts of the San Joaquin Valley, as well as along a lingering frontal zone near or just south of the Gulf into southern Atlantic coastal plain. Due to a combination of low predictability and low severe weather potential, severe weather probabilities are being maintained at less than 15 percent through this period.
..Kerr.. 04/28/2026
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 | Friday, May 1 | potential too low |
| Day 5 | Saturday, May 2 | potential too low |
| Day 6 | Sunday, May 3 | potential too low |
| Day 7 | Monday, May 4 | potential too low |
| Day 8 | Tuesday, May 5 | potential too low |
← back to overviewZCZC SPCSWOD48 ALL ACUS48 KWNS 280923 SPC AC 280923
Day 4-8 Convective Outlook RESENT 1 NWS Storm Prediction Center Norman OK 0423 AM CDT Tue Apr 28 2026
Valid 011200Z - 061200Z
DISCUSSION
Medium-range guidance indicates that the evolving split flow may maintain a broadly confluent mid-level regime across and east of the Rockies through this period. While a broad area of lower mid-level heights remains centered across the Ontario/Quebec and Upper Midwest through Northeast, it appears that a more prominent blocking ridge/high may evolve upstream near the British Columbia/Pacific Northwest coast by late this coming weekend into early next week. A developing low to its southeast may slowly progress inland across California into the Southwest, with downstream mid-level ridging building across the Rockies.
There is considerable model spread concerning embedded short wave developments, but it appears that potential for stronger convection will remain generally low for the time of year and confined to parts of the southern tier of the U.S., perhaps including parts of the San Joaquin Valley, as well as along a lingering frontal zone near or just south of the Gulf into southern Atlantic coastal plain. Due to a combination of low predictability and low severe weather potential, severe weather probabilities are being maintained at less than 15 percent through this period.
..Kerr.. 04/28/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
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