032  
ACUS03 KWNS 301922  
SWODY3  
SPC AC 301921  
 
DAY 3 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0221 PM CDT MON JUN 30 2025  
 
VALID 021200Z - 031200Z  
 
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF  
THE NORTHERN ROCKIES...  
   
..SUMMARY
 
 
AT LEAST SCATTERED STORMS ARE POSSIBLE ACROSS A LARGE PORTION OF THE  
CONTINENTAL U.S. ON WEDNESDAY. A COUPLE OF SEVERE GUSTS MAY  
ACCOMPANY THE STRONGER STORMS OVER PORTIONS OF THE NORTHERN ROCKIES.  
   
..SYNOPSIS
 
 
A MID-LEVEL TROUGH WILL MEANDER ACROSS THE NORTHEAST WHILE UPPER  
RIDGING PERSISTS OVER THE CENTRAL CONUS AND A MID-LEVEL TROUGH  
ADVANCES OVER THE PACIFIC NORTHWEST ON WEDNESDAY. SEASONAL MOISTURE  
AND ASSOCIATED DIURNAL HEATING WILL ENCOURAGE AT LEAST SCATTERED  
DEVELOPMENT ACROSS MOST OF THE CONUS DURING THE AFTERNOON AND  
EVENING HOURS. HOWEVER, A COUPLE OF THUNDERSTORMS EMBEDDED IN THE  
STRONGER MID-LEVEL FLOW OVER THE NORTHERN ROCKIES COULD BECOME  
STRONG. GIVEN ADEQUATE SHEAR AND INSTABILITY IN THIS REGION, A FEW  
OF THE STRONGER STORMS COULD BECOME SEVERE.  
   
..PORTIONS OF THE NORTHERN ROCKIES
 
 
THE PERIPHERY OF RELATIVELY GREATER MID-LEVEL MOISTURE IS POISED TO  
TRAVERSE THE WESTERN EXTENT OF THE UPPER RIDGE ON WEDNESDAY.  
STRONGER WEST-SOUTHWESTERLY MID-LEVEL FLOW WILL GRAZE THE NORTHERN  
ROCKIES DUE TO THE APPROACH OF THE UPPER TROUGH TO THE WEST. ROBUST  
BOUNDARY LAYER HEATING IN THIS REGION WILL BOOST LOW-LEVEL LAPSE  
RATES TO 9 C/KM OVER SEVERAL LOCALES, AS 8.5 C/KM MID-LEVEL LAPSE  
RATES OVERSPREADS THE WELL-MIXED BOUNDARY LAYER. MLCAPE MAY EXCEED  
1000 J/KG OVER MANY AREAS, AND THUNDERSTORMS ACCESSING THIS BUOYANCY  
WILL BE EMBEDDED IN STRONGER MID-LEVEL FLOW AND 30-40 KTS OF  
EFFECTIVE BULK SHEAR. AS SUCH, STRONGER MULTICELLS MAY PRODUCE A MIX  
OF WET AND DRY DOWNBURSTS, PERHAPS INDUCING A COUPLE OF SEVERE  
GUSTS.  
 
..SQUITIERI.. 06/30/2025  
 

 
 
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