894
FXUS63 KUNR 131755
AFDUNR
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
1155 AM MDT WED MAY 13 2026
KEY MESSAGES
-WARM AND WINDY THIS WEEK WITH CRITICAL TO NEAR CRITICAL FIRE
WEATHER CONDITIONS THE REST OF THE WEEK
-COOLER EARLY NEXT WEEK WITH SOME CHANCES FOR SHOWERS
DISCUSSION
(THIS AFTERNOON THROUGH TUESDAY)
ISSUED AT 1121 AM MDT WED MAY 13 2026
WESTERN CONUS RIDGE WILL REMAIN IN PLACE MOST OF THIS WEEK,
SUPPORTING WARM AND DRY WEATHER. RIDGE TOPPING IMPULSES WILL
SUPPORT WEAK COOL FRONTS AT TIMES, WITH LITTLE TO NO PRECIP WITH
EACH SYSTEM. BREEZY SOUTHEAST WINDS HAVE DEVELOPED ACROSS WESTERN
SD IN RESPONSE TO THE ADVANCING PAC NW UPPER TROUGH. ASSOCIATED
FRONTSIDE IMPULSE WILL SHIFT EAST INTO NE WY LATER THIS AFTERNOON
AND EVENING. SUFFICIENT LL MOISTURE SHOULD BE IN PLACE FOR
ISOLATED HIGH BASED SHOWERS/TS. IF CONVECTION DOES DEVELOP, GUSTY
WINDS WOULD BE EXPECTED PER INVERTED-V PROFILES. ANY CONVECTION
WILL SHIFT NE OVERNIGHT IN VERY ISOLATED FASHION. RETAINED LOW
POPS FOR THIS. SFC TROUGH WILL SHIFT THROUGH THE FA TONIGHT INTO
THUR MORNING, SUPPORTING GUSTY NW WINDS. BREEZY WINDS CAN EXPECTED
THUR, ESP OVER NW SD WHERE ADV LEVEL WINDS ARE EXPECTED WITH
GUSTS OVER 50 MPH AT TIMES. ISSUED A WIND ADV FOR THIS. BREEZY NW
WINDS WILL CONTINUE INTO FRIDAY AS ANOTHER WEAK IMPULSE ADVECTS
THROUGH WESTERLY FLOW ON THE SOUTH SIDE OF THE DEEPER SOUTHERN
CANADIAN UPPER TROUGH. DEEPER UPPER TROUGH WILL MOVE INTO THE
ROCKIES THIS WEEKEND, LEADING TO MUCH COOLER TEMPS BY SUNDAY, AS
WELL AS SLIGHTLY BETTER CHANCES FOR SHOWERS INTO EARLY NEXT WEEK.
HOWEVER, THE BULK OF MOISTURE STAYS EAST OF THE FA, WITH MORE
ISOLATED TO SCATTERED ACTIVITY EXPECTED IN THE FA. EXPECT HIGHS
IN THE 50S AND 60S MOST PLACES MONDAY AND TUES, WITH SOME 40S IN
THE WEST MONDAY, BEFORE THINGS START TO WARM BACK UP WED. SOME
FROST WILL ALSO BE POSSIBLE IN THIS PERIOD, ESP ACROSS NORTHEAST
WY.
AVIATION
(FOR THE 18Z TAFS THROUGH 18Z THURSDAY)
ISSUED AT 1149 AM MDT WED MAY 13 2026
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD. A FEW HIGHER
BASED ISOLATED SHOWERS/STORMS WILL BE POSSIBLE THIS EVENING INTO
TONIGHT MOVING WEST TO EAST ACROSS THE REGION, AND BASED ON THE
LATEST CAMS HAVE ADDED PROB30S TO BOTH KGCC AND KRAP TO HIGHLIGHT
THIS POTENTIAL. VFR CONDITIONS ARE STILL EXPECTED IN ANY SHOWERS.
FINALLY, A SHIFT FROM SOUTH-SOUTHWEST WINDS TO NORTHWEST WINDS IS
EXPECTED FROM WEST TO EAST BETWEEN 08Z AND 14Z THURSDAY MORNING.
FIRE WEATHER
ISSUED AT 1121 AM MDT WED MAY 13 2026
WARM, DRY AND, WINDY CONDS WITH RECEPTIVE FUELS WILL CONTINUE TO
SUPPORT CRITICAL TO NEAR CRITICAL CONDS TO MOST OF WESTERN SD
THROUGH THE END OF THE WEEK. A RED FLAG WARNING REMAINS IN EFFECT
THROUGH THUR, WITH A LONG DURATION OF CRITICAL FIRE WEATHER
CONDITIONS EXPECTED. BREEZY SE WINDS TODAY AHEAD OF A TROUGH OF
LOW PRESSURE. VERY DRY CONDS, WITH RH'S EXPECTED TO FALL TO AS LOW
AS 10 PERCENT BOTH TODAY AND THUR AFTERNOON (FRIDAY AS WELL). THE
TROUGH WILL MOVE THROUGH THIS EVENING AND SUPPORT GUSTY NW WINDS,
WITH POOR OVERNIGHT RECOVERY. GUSTY NW WINDS WILL CONTINUE THUR
WITH CONTINUED VERY DRY PROFILES. DRY AND BREEZY THROUGH SAT. THE
RED FLAG WARNING WILL MOST LIKELY NEED EXTENDED ACROSS SOUTHWEST
SD FRIDAY AS CRITICAL FIRE WEATHER CONDITIONS ARE FORECAST. COOLER
WITH SHOWER CHANCES EARLY NEXT WEEK, LEADING TO A BREAK IN FIRE
WEATHER CONCERNS ALTHOUGH THE BEST CHANCE FOR WETTING RAINS WILL
BE EAST OF THE AREA.
UNR WATCHES/WARNINGS/ADVISORIES
SD...WIND ADVISORY FROM 9 AM TO 6 PM MDT THURSDAY FOR SDZ001-002-012-
013-078.
RED FLAG WARNING UNTIL 9 PM MDT THURSDAY FOR SDZ322>327-329>333.
WY...
DISCUSSION/KEY MESSAGES...JC
AVIATION...DYE
FIRE WEATHER...JC
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