030
ACUS48 KWNS 210813
SWOD48
SPC AC 210811
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0311 AM CDT SUN JUN 21 2026
VALID 241200Z - 291200Z
..DISCUSSION
..D4/WEDNESDAY AND D5/THURSDAY - CENTRAL HIGH PLAINS
AS HIGH PRESSURE BUILDS INTO THE CENTRAL/NORTHERN PLAINS ON
WEDNESDAY AND THURSDAY, UPSLOPE FLOW WILL REMAIN PERSISTENT ACROSS
EASTERN COLORADO AND EASTERN WYOMING. MODERATE TO STRONG INSTABILITY
IS EXPECTED IN THIS AREA WITH 40 TO 50 KNOTS OF WEST-NORTHWESTERLY
FLOW ALOFT. THIS SHOULD RESULT IN A FAVORABLE UPSLOPE REGIME CAPABLE
OF SUPERCELLS. A RELATIVELY NARROW UNSTABLE CORRIDOR SHOULD KEEP THE
MOST FAVORABLE SEVERE THREAT SOMEWHAT CONFINED TO THE HIGHER
ELEVATION PRAIRIES WHERE INSTABILITY AND UPSLOPE FLOW WILL BE
MAXIMIZED.
FRIDAY AND SATURDAY, RIDGING IS FORECAST TO TRANSLATE EAST ACROSS
THE PLAINS, WHICH MAY LEAD TO A RELATIVE LULL IN SEVERE WEATHER
THREAT. HOWEVER, BY SUNDAY AND INTO EARLY NEXT WEEK, THERE IS A
STRONG SIGNAL FOR TROUGHING AND MODERATE TO STRONG MID-LEVEL FLOW
ACROSS THE NORTHERN PLAINS AND INTO THE UPPER MIDWEST. SEVERAL DAYS
OF SUBSTANTIAL SEVERE WEATHER ARE POSSIBLE DURING THIS PERIOD.
HOWEVER, AT THIS TIME, THE TIMING AND AMPLITUDE OF THESE FEATURES
MAKE IT CHALLENGING TO HIGHLIGHT SPECIFIC AREAS. AS THE EVOLUTION OF
THIS MID-LEVEL PATTERN BECOMES MORE CLEAR, SEVERE WEATHER
PROBABILITIES MAY BE ADDED IN LATER OUTLOOKS.
..BENTLEY.. 06/21/2026
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