113
ACUS02 KWNS 201732
SWODY2
SPC AC 201730
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CDT SUN JUL 20 2025
VALID 211200Z - 221200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
EASTERN/CENTRAL MONTANA...
..SUMMARY
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING SEVERE WIND GUSTS AND
LARGE HAIL ARE EXPECTED ACROSS PARTS OF THE NORTHERN GREAT PLAINS.
DAMAGING THUNDERSTORM WIND GUSTS ARE ALSO POSSIBLE ACROSS PARTS OF
THE OHIO VALLEY AND THE SOUTHEAST.
..NORTHERN PLAINS
DOWNSTREAM OF A SLOW-MOVING MIDLEVEL TROUGH OVER THE NORTHWEST, A
RELATED SOUTHWESTERLY JET STREAK WILL EMERGE OVER THE NORTHERN
ROCKIES INTO THE ADJACENT HIGH PLAINS DURING THE DAY. RELATED
FORCING FOR ASCENT WILL AID IN WIDELY SCATTERED THUNDERSTORM
DEVELOPMENT WITHIN A DEEPLY MIXED AIR MASS OVER WESTERN/CENTRAL MT.
AS STORMS TRACK EASTWARD INTO AN INCREASINGLY MOIST AND UNSTABLE AIR
MASS OVER CENTRAL/EASTERN MT, AROUND 50 KT OF EFFECTIVE SHEAR WILL
PROMOTE SUPERCELLS AND SMALL ORGANIZED CLUSTERS. ANY LONGER-LIVED
STORMS WILL BE CAPABLE OF PRODUCING SEVERE WIND GUSTS AND LARGE
HAIL.
..OHIO VALLEY AND THE SOUTHEAST
MODESTLY ENHANCED WEST-NORTHWESTERLY FLOW WILL BE IN PLACE FROM THE
OH/TN VALLEYS TO THE SOUTHEAST. HERE, DIURNAL HEATING AMID DEEP
TROPOSPHERIC MOISTURE WILL CONTRIBUTE TO AN ENVIRONMENT FAVORABLE
FOR LOCALLY DAMAGING THUNDERSTORM WIND GUSTS THROUGH THE AFTERNOON.
..WEINMAN.. 07/20/2025
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