905  
ACUS01 KWNS 051912  
SWODY1  
SPC AC 051910  
 
DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0210 PM CDT SAT JUL 05 2025  
 
VALID 052000Z - 061200Z  
 
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON  
AND EVENING FROM SOUTHEAST MONTANA AND NORTHEAST WYOMING INTO  
WESTERN SOUTH DAKOTA...  
   
..SUMMARY  
 
SCATTERED SEVERE STORMS ARE LIKELY ACROSS PORTIONS OF THE NORTHERN  
HIGH PLAINS THIS AFTERNOON THROUGH THE EVENING. SEVERE WIND GUSTS  
AND LARGE HAIL ARE THE PRIMARY HAZARDS.  
   
..20Z UPDATE  
 
THE CURRENT D1 CONVECTIVE OUTLOOK REMAINS ON TRACK WITH NO UPDATES  
NEEDED. SEE THE PREVIOUS DISCUSSION BELOW FOR MORE INFORMATION.  
 
..THORNTON.. 07/05/2025  
   
PREV DISCUSSION  
/ISSUED 1058 AM CDT SAT JUL 05 2025/  
   
..NORTHERN HIGH PLAINS  
 
MORNING WATER VAPOR LOOP SHOWS A SHORTWAVE TROUGH PROGRESSING INTO  
SOUTHERN ID. THIS FEATURE WILL MOVE ACROSS THE NORTHERN ROCKIES,  
SPREADING LARGE SCALE FORCING INTO MUCH OF MT THIS AFTERNOON.  
SCATTERED THUNDERSTORMS ARE EXPECTED TO FORM OVER THE MOUNTAINS OF  
SOUTHWEST MT AND NORTHERN WY DURING THE EARLY/MID AFTERNOON AND  
SPREAD EASTWARD INTO A PROGRESSIVELY MORE MOIST/BUOYANT AIR MASS.  
EASTERLY LOW-LEVEL WINDS IN THE PLAINS, COUPLED WITH FAVORABLE  
WESTERLY FLOW ALOFT WILL PROMOTE SUPERCELL STORM STRUCTURES CAPABLE  
OF LARGE HAIL. MOST 12Z CAM GUIDANCE SUGGESTS UPSCALE GROWTH TO  
BOWING SEGMENTS AS STORMS TRACK ACROSS EASTERN MT/WY INTO WESTERN  
SD, WITH AN INCREASING RISK OF SIGNIFICANT WIND DAMAGE.  
   
..CO/KS  
 
FULL SUNSHINE IS OCCURRING THIS MORNING OVER NORTHEAST CO, LEADING  
TO AFTERNOON TEMPERATURES IN THE 90S AND STEEP LOW-LEVEL LAPSE  
RATES. HIGH-BASED CONVECTION WILL FORM OFF THE FOOTHILLS DURING THE  
AFTERNOON AND MOVE INTO THIS ENVIRONMENT THAT WILL BE FAVORABLE FOR  
STRONG DOWNDRAFTS. A CONSENSUS OF MORNING MODEL GUIDANCE SUGGESTS A  
CLUSTER OF STORMS WILL EVOLVE FROM THIS AREA, SPREADING EASTWARD  
INTO WESTERN KS THIS EVENING. LOCALLY DAMAGING WIND GUSTS WILL BE  
POSSIBLE. HAVE EXTENDED THE SLGT RISK SOUTHWARD TO INCLUDE THIS  
SCENARIO.  
   
..SC/NC  
 
TROPICAL STORM CHANTAL WILL TRACK NORTHWARD TODAY, APPROACHING THE  
SC COAST BY EARLY SUNDAY MORNING. FORECAST SOUNDINGS SUGGEST THAT  
LOW-LEVEL SHEAR WILL STEADILY INCREASE THROUGH THE NIGHT ALONG THE  
COAST OF EASTERN SC AND SOUTHERN NC. OUTER RAIN BANDS ASSOCIATED  
WITH THE SYSTEM WILL POSE A MRGL RISK OF TORNADOES.  
 
 
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