ACUS01 KWNS 031954
SWODY1
SPC AC 031952

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0252 PM CDT Sat May 03 2025

Valid 032000Z - 041200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE CAROLINAS INTO THE MID-ATLANTIC AND NEW ENGLAND...

...SUMMARY...
Scattered strong to severe thunderstorms are possible this afternoon
and evening from parts of the Carolinas into the Mid-Atlantic and
Northeast. A more isolated severe threat may develop across the
Southeast, and also across parts of the Great Basin and far west Texas.

...20z update...
Minimal changes were made to the current forecast, mostly trimming probabilities from the west. A broad corridor of severe potential
continues from southern New England to the Gulf Coast. Partial
diurnal heating east of the frontal zone is supporting a few
clusters of stronger storms from southern NY/New England and the Mid
Atlantic to the western Carolinas. 30-40 kt of bulk shear, in
combination with 500-1000 J/kg of MLCAPE will favor damaging winds
as the main threat with the multicell clusters or transient
supercells that develop as they spread northeastward through the
evening. Some sporadic hail and a brief tornado will also be
possible with any stronger rotating storms.

...AL and western GA...
Another corridor of locally stronger clusters may evolve across the
Gulf Coast, to central AL and into western GA later this afternoon
into the evening. Here, stronger diurnal heating (temps in the mid
to upper 70s F) amid enhanced mid-level flow from the sub tropical
jet may pose a locally greater severe risk for a few hours. A mix of
line segments and some supercell structures could pose a locally
greater severe risk. Some consideration was given to higher wind
probabilities here, but confidence in more robust convective
organization remains low, with lingering cloud cover, modest forcing
and limited buoyancy. Otherwise, the outlook remains unchanged, see
the previous discussion for more info.

..Lyons.. 05/03/2025

.PREV DISCUSSION... /ISSUED 1128 AM CDT Sat May 03 2025/

...Carolinas into the Mid-Atlantic and New England...
Generally upper 50s to low 60s surface dewpoints are present
along/east of the higher terrain of the Blue Ridge/Appalachians from
parts of the Carolinas northeastward into the Mid-Atlantic and
southern New England. Even with mid-level lapse rates remaining
fairly modest, around 500-1000 J/kg of MLCAPE is forecast to develop
this afternoon in a narrow corridor across these regions with
additional filtered daytime heating. Large-scale ascent associated
with a slow-moving upper trough over the mid MS Valley will
gradually overspread the destabilizing warm sector in the next few
hours. This ascent, along with orographic lift over the higher
terrain, should aid in the development of scattered strong to severe thunderstorms this afternoon and evening.

Around 30-40 kt of deep-layer shear should be present, which will
support a mix of multicells and marginal supercells. Scattered
damaging winds should be the main threat with the multiple clusters
that develop as they spread northeastward through the evening, but
some hail may also occur with any sustained supercell. Greater
confidence exists in overall thunderstorm coverage and intensity
across parts of the Mid-Atlantic into southern New England, where
the Slight Risk has been maintained with minimal changes. The
tornado threat remains less clear across these regions, but some
modest enhancement to the southwesterly low-level flow could aid in
occasional low-level updraft rotation.

...Southeast...
12Z soundings across the central Gulf Coast states show that
convection that occurred yesterday into the overnight/early morning
hours generally stabilized the environment this morning. Widespread
cloudiness evident in visible satellite imagery late this morning
should tend to delay/hinder robust destabilization this afternoon
along/ahead of the southeastward-advancing synoptic cold front,
which lends considerable uncertainty to the overall intensity of
renewed convection along/ahead of the front later today. Still,
mid-level winds and related deep-layer shear are forecast to
gradually strengthen through the afternoon/evening as the upper
trough over the mid MS/lower OH Valley develops slowly eastward.
This should support some threat for organized convection, and
isolated damaging winds may occur with any clusters that can form.
With continued concerns regarding the degree of instability
developing this afternoon, confidence remains too low to include
greater severe wind probabilities at this time.

...Great Basin...
Modestly enhanced southerly mid-level flow will overspread parts of
the western and northern Great Basin as an upper trough moves
eastward over the western CONUS through the afternoon/evening. While boundary-layer moisture is expected to remain very limited,
increasing mid-level moisture and diurnal destabilization should aid
in weak MLCAPE developing by this afternoon. Scattered thunderstorms
are forecast to develop and spread northward, with an isolated
threat for severe winds given steepened low-level lapse rates and a
very well mixed boundary layer. Small hail may also occur with the
strongest cores.

...Far West Texas...
Even though large-scale ascent should remain weak/nebulous across
far west TX and vicinity today, isolated supercell development still
appears possible in a modest post-frontal/low-level upslope flow
regime. Both low-level winds and MLCAPE are expected to remain
modest, but strengthening westerly winds with height in mid/upper
levels should support around 30-40 kt of deep-layer shear and some
updraft organization. Based on latest guidance trends showing a
supercell or two developing this afternoon/evening, have introduced
a Marginal Risk for hail across parts of far west TX and vicinity.

$$
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ACUS01 KWNS 041252
SWODY1
SPC AC 041250

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0750 AM CDT Sun May 04 2025

Valid 041300Z - 051200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS EASTERN NEW
MEXICO AND FAR WEST TEXAS...

...SUMMARY...
Strong to potentially severe storms are expected across east-central
and southeast New Mexico and far west Texas this afternoon and
evening, with a threat for large hail, isolated severe wind gusts,
and possibly a tornado. Other strong to locally severe storms are
possible from Florida northward into the Mid-Atlantic and Allegheny Plateau.

...New Mexico/West Texas...
In advance of the upper trough over the Southwest Deserts,
increasing height falls and strongly diffluent flow aloft will
overspread a modestly moist boundary layer with prevalent 40s to
near 50F surface dewpoints. Beneath steep mid-level lapse rates,
upwards of 500-1000 J/kg MLCAPE is expected by late afternoon.
Scattered thunderstorms are expected across northern into
east-central New Mexico, with more isolated storms expected into far
southeast New Mexico and west Texas. Wind profiles veering with
height and increasing mid-level southwesterly winds will provide
sufficient deep-layer shear for storm organization, including the
probable development of a few supercells. Large hail and localized
severe wind gusts will be possible. In addition, enlarging low-level
hodographs and gradually improving low-level moisture could support
a tornado or two if any mature supercells can persist through late
afternoon into the evening.

...Florida...
A cluster of storms across the north-central Peninsula, and to a
lesser extent across the south-central Peninsula, may pose a
localized severe risk as they continue eastward today. Existing
cloud cover may tend to somewhat mute more robust heating, but
gradual destabilization should still occur particularly along the
east coast, which will also probably influence storm development.
Effective shear of 25-30 kt will support potentially organized
storms capable of hail and isolated damaging gusts, and some tornado
threat may exist particularly in the vicinity of the sea breeze or
any other boundaries.

...Allegheny Plateau into the Carolinas...
East of the semi-stacked/closed low, cloud breaks and cold
temperatures aloft should support modest diurnal destabilization
across parts of Ohio and West Virginia into western Pennsylvania.
Storm development should be aided one or more low-amplitude
vorticity maxima rotating around the midlevel cyclone amidst
diffluent flow aloft. Low-level winds are expected to remain rather
weak, but modestly veering wind profiles and moderate mid-level flow
could support some storm organization, if sufficient buoyancy can be
realized. Hail and locally gusty winds could accompany the strongest
storms, and a corridor of higher severe probabilities (Slight Risk
caliber) may be warranted if a scenario with somewhat greater
destabilization appears likely.

Farther south into the Carolinas and parts of the Mid-Atlantic
region, somewhat stronger diurnal heating is expected, and MLCAPE
may increase to near/above 1000 J/kg. However, storm coverage is
more uncertain, with a notable mid-level dry slot and only weak to
modest large-scale ascent expected with southward extent. Any storms
that can mature within this environment could become modestly
organized with a threat of isolated hail and damaging gusts.

...Eastern Idaho/southwest Montana...
Scattered storm development is expected this afternoon and evening
across eastern Idaho into southwest Montana, within an environment characterized by cool temperatures aloft and steep lapse rates.
Deep-layer shear will be relatively modest, but a few stronger
storms with small hail and gusty winds could occur. Subsequent
outlooks will reevaluate the need for a potential introduction of
low-end severe probabilities.

..Guyer/Jewell.. 05/04/2025

$$
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ACUS01 KWNS 112000
SWODY1
SPC AC 111959

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0259 PM CDT Sun May 11 2025

Valid 112000Z - 121200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE
NORTHERN ROCKIES/GREAT BASIN AND MONTANA HIGH PLAINS...

...SUMMARY...
Scattered severe wind gusts are expected across the northern
Rockies/Great Basin and the Montana High Plains from mid-afternoon
into the evening. Isolated severe thunderstorms are also possible
across the Southeast today through tonight.

...20Z Update...
The only noteworthy change with this update was a southwestward
expansion of the Slight Risk area into northern UT, driven by
15-percent severe wind probabilities. Here, ample diurnal heating
has resulted in a deep/dry boundary layer supportive of scattered
severe wind gusts accompanying high-based storms. Reference Severe
Thunderstorm Watch #245 for more details. Farther east, isolated
severe storms capable of producing locally damaging winds and
marginally severe hail remain possible across the Southeast into
this evening. Reference MCDs #766/767 for details.

..Weinman.. 05/11/2025

.PREV DISCUSSION... /ISSUED 1119 AM CDT Sun May 11 2025/

...Northern Rockies/High Plains and northeast Great Basin...
Strengthening southwesterly flow aloft is anticipated throughout the
day as the upper low off the Pacific Northwest coast progresses
eastward and a lead shortwave trough pivots through OR/northern CA
into the northern Rockies. Strong heating will help destabilize the
airmass downstream from the northern Rockies into the northern High
Plains. Large-scale ascent attendant to the approaching shortwave
trough, coupled with orographic lift, will help initiate storms
across the high terrain during the afternoon within this
destabilized airmass.

Environmental conditions suggest some supercells are possible with
this initial development, with damaging gusts and isolated hail as
the primary risk. A low-probability corridor of tornado potential
exists across southeast ID. The storms should encounter an
increasingly mixed environment with eastern/northeastern extent into
central MT, with strong gusts becoming the primary severe hazard as
storms trend towards more outflow-dominant linear structures.

...Southeast States...
Recent satellite imagery and surface observations continue to show
the vertically stacked low over the Lower MS Valley, with broad
swath of southwesterly flow extending south and east of this low
from the central Gulf into FL. Surface features have become
increasingly diffuse across the Southeast and FL over the past two
days given the persistence of this low and associated precipitation,
but recent surface analysis shows a weak and wavy stationary
boundary extending from the low over the ArkLaMiss southeastward to
the AL/FL Panhandle border before arcing back northeastward across
southern GA.

Scattered thunderstorms are ongoing and the general expectation is
for scattered to numerous thunderstorms to persist across much of
the region throughout the day. Widespread cloudiness should limit
heating, but ample low-level moisture will still support modest
buoyancy. Shear will gradually increase as the low to mid-level flow strengthens this afternoon and evening, which could lead to some
transient storm organization, but in general convection is expected
to be disorganized, outflow-dominated multicells. Even so, isolated
damaging gusts are possible. Some low-probability tornado potential
exists as well, particularly along the stationary boundary across
southern GA around 00Z.

Farther northwest across AL/MS and into eastern AR, the airmass is
forecast to destabilize this afternoon as heating occurs beneath
cool temperatures aloft. Even with the cooler temperature aloft,
overall buoyancy will be modest given the somewhat cool low to
mid-level thermodynamic profile. Even so, a nearly unidirectional
southeasterly wind profile with moderate deep-layer speed shear
could support brief updraft organization. As a result, a few cells
may briefly produce marginally severe hail and locally strong gusts,
and possibly some funnel/brief tornado potential, from late
afternoon through early/mid-evening.

$$
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