Source: US National Oceanic and Atmospheric Administration
Day 4-8 Severe Weather Outlook Issued on Apr 20, 2025
Updated: Sun Apr 20 08:26:02 UTC 2025
.
D4
Wed, Apr 23, 2025 – Thu, Apr 24, 2025
D7
Sat, Apr 26, 2025 – Sun, Apr 27, 2025
D5
Thu, Apr 24, 2025 – Fri, Apr 25, 2025
D8
Sun, Apr 27, 2025 – Mon, Apr 28, 2025
D6
Fri, Apr 25, 2025 – Sat, Apr 26, 2025
(All days are valid from 12 UTC – 12 UTC the following day)
Note: A severe weather area depicted in the Day 4-8 period indicates 15%, 30% or higher probability for severe thunderstorms within 25 miles of any point.
PREDICTABILITY TOO LOW is used to indicate severe storms may be possible based on some model scenarios. However, the location or occurrence of severe storms are in doubt due to: 1) large differences in the deterministic model solutions, 2) large spread in the ensemble guidance, and/or 3) minimal run-to-run continuity.
POTENTIAL TOO LOW means the threat for a regional area of organized severe storms appears unlikely (i.e., less than 15%) for the forecast day.
Forecast Discussion
ZCZC SPCSWOD48 ALL
ACUS48 KWNS 200823
SPC AC 200823
Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0323 AM CDT Sun Apr 20 2025
Valid 231200Z – 281200Z
…DISCUSSION…
A low-amplitude southwesterly flow regime will prevail for much of
the Day 4-8 period across portions of the central and eastern U.S.,
with a mean upper trough persisting across the western states.
Persistent south/southeasterly low-level flow across the Gulf and
southern Plains will result in northward transport of rich
boundary-layer moisture across the southern and parts of the central
Plains through at least Day 6/Fri. Forecast guidance suggests weak
shortwave impulses may float through modest southwesterly flow Days
4-5/Wed-Thu, perhaps providing some support for isolated to
scattered thunderstorm potential across the warm sector over
TX/OK/KS. Given a moist and unstable airmass, at least some severe
potential will exist. However, where exactly severe potential may
develop Day 4-5/Wed-Thu is uncertain given a lack of stronger
large-scale ascent and absence of any substantial surface
cyclogenesis, coupled with modest deep-layer flow. This precludes 15
percent probabilities at this time, though outlook areas could
become necessary in later outlooks as smaller-scale features become
better resolved.
A period of weak upper ridging may spread across the Plains and the
eastern U.S. on Days 6-7/Fri-Sat ahead of a more substantial upper
trough developing over the western U.S. This may limit severe
potential late in the week before the western upper trough ejects
east toward the end of the forecast period.
..Leitman.. 04/20/2025
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