RSS Mesoscale Discussions from Storm Prediction Center
WW 243 SEVERE TSTM IA MN NE SD 242155Z - 250400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 243
NWS Storm Prediction Center Norman OK
455 PM CDT Sun May 24 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northwest Iowa
Southwest Minnesota
Northeast Nebraska
Southeast South Dakota
* Effective this Sunday afternoon and evening from 455 PM until
1100 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 65 mph possible
SUMMARY...High-based supercells are expected from northeast Nebraska
across southeast South Dakota into southwest Minnesota this evening,
and storms could spread into northwest Iowa before weakening early
tonight. The storms will be capable of producing large hail (1.5-2
inches in diameter) and isolated severe outflow gusts (60-65 mph).
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 40 miles north of Redwood
Falls MN to 30 miles west southwest of Norfolk NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 55 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27015.
...Thompson
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WW 0243 Status Updates
STATUS REPORT ON WW 243
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 ENE SUX
TO 15 SE YKN TO 30 W YKN TO 25 E MHE TO 25 SW BKX TO 25 W FRM.
WW 243 WILL BE ALLOWED TO EXPIRE AT 250400Z.
..MEAD..05/25/26
ATTN...WFO...FSD...MPX...OAX...LBF...
STATUS REPORT FOR WS 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC119-141-143-149-167-250400-
IA
. IOWA COUNTIES INCLUDED ARE
LYON O'BRIEN OSCEOLA
PLYMOUTH SIOUX
MNC063-105-133-250400-
MN
. MINNESOTA COUNTIES INCLUDED ARE
JACKSON NOBLES ROCK
SDC027-083-087-099-125-127-250400-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CLAY LINCOLN MCCOOK
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No Mesoscale Discussions are in effect as of Mon May 25 03:33:02 UTC 2026.
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0752 PM CDT Sun May 24 2026
Valid 250100Z - 251200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING
ACROSS PARTS OF NORTHEASTERN NEBRASKA...SOUTHEASTERN SOUTH
DAKOTA...NORTHWESTERN IOWA...SOUTHWESTERN MINNESOTA...
...SUMMARY...
Isolated supercell development may persist in a narrow corridor
across northeastern Nebraska into southwestern Minnesota through mid
to late evening before diminishing.
...01Z Update...
...Mid Missouri Valley...
Mid-level heights continue to build across much of the northern
Rockies and Missouri Valley into Upper Midwest. Primary forcing for
ongoing convective development appears to lift associated with weak
lower/mid-tropospheric warm advection, along and east of weak
northern Great Plains surface troughing. Low-level moisture return
has remained rather modest (with maximum surface dew points still in
the mid/upper 50s F) and confined to a narrow corridor, but this
appears to be contributing to CAPE on the order of 1000-2000 J/kg.
The onset of radiational surface cooling, coupled with warming
aloft, probably will result in rapidly increasing inhibition within
the next couple of hours. This should be accompanied by diminishing
convective trends, but it is possible that this could be slowed
somewhat by forcing on the nose of a nocturnally strengthening
low-level jet.
...Southern Appalachians...
As a remnant lower/mid-tropospheric mesoscale convective vortex
migrates north-northeastward across northwestern Georgia into the
southern Appalachians, modest clockwise-curved low-level hodographs
are developing across the Piedmont of eastern Georgia into South
Carolina. This is where a recent increase in thunderstorm
development is ongoing in the presence of a seasonably moist
boundary-layer characterized by sizable CAPE. With the surface dew
points in the lower 70s enhancing low-level buoyancy and potential
near surface upward accelerations, an isolated tornado may not be
out of the question, before forcing spreads into cooler/more stable
air.
..Kerr.. 05/25/2026
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