885
FXUS63 KUNR 072333
AFDUNR
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
533 PM MDT TUE JUL 7 2026
KEY MESSAGES
-ACTIVE THROUGH MID WEEK AS A SERIES OF DISTURBANCES MOVE THROUGH
THE REGION, WITH SEVERE THUNDERSTORMS POSSIBLE TODAY, MORE
ISOLATED WED AND THUR
-VERY HOT THIS WEEKEND INTO EARLY NEXT WEEK WITH RECORD HIGH
TEMPS POSSIBLE AND DANGEROUS HEAT
DISCUSSION
(THIS AFTERNOON THROUGH MONDAY)
ISSUED AT 1025 AM MDT TUE JUL 7 2026
IMPULSE FILLED WESTERLY FLOW WILL BE IN PLACE OVER THE REGION
THROUGH THURSDAY AS A FRONTAL BOUNDARY REMAINS IN PLACE. NEAR
DAILY CHANCES FOR THUNDERSTORMS CAN BE EXPECTED WITH SEVERE STORMS
POSSIBLE AT TIMES, BEST CHANCES TODAY. SFC FRONT STALLED ACROSS
THE FA TODAY. THE FRONT HAS SETTLED FURTHER SOUTH THAT PREVIOUS
MODEL RUNS INDICATED YESTERDAY, WITH A SOUTHWARD SHIFT OF THE BEST
SEVERE POTENTIAL. MODERATELY STRONG IMPULSE WILL KICK OUT OF
WY/MT IN THE THE AFTERNOON AND EVENING AND WILL DRIVE CI THERE.
STORMS MAY ALSO FIRE ALONG THE PINE RIDGE AND INVOF OF THE FRONT
IF CAPPING CAN BE OVERCOME. ANOTHER LOCATION FOR CI WILL BE
NORTHERN BH IF THE INHIBITION IS ALSO OVERCOME. GIVEN PROGGED ML
CAPE OF 1-2.5 KJ/KG, DEEP BULK LAYER SHEAR OF 35 TO 45 KNOTS
(HIGHEST NORTH OF THE SFC FRONT), EXPECT SUPERCELLS TO BE POSSIBLE
WITH STRONG ROTATING UPDRAFTS, CAPABLE OF PRODUCING LARGE HAIL
AND DAMAGING WINDS. BEST CHANCES FOR ROTATING STORMS WILL BE ALONG
AND NORTH OF THE SFC FRONT. STILL A VERY SMALL WINDOW FOR
TORNADOES WITH ANY STORMS NEAR THE SFC FRONT, WHICH WILL START
SHIFTING SW INTO SW SD THIS AFTERNOON. STORMS WILL CARRY ACROSS
THE REGION THROUGH THE EVENING AND OVERNIGHT, POSSIBLY LINGERING
INTO THE MORNING WED AS ELEVATED ACTIVITY. MORE STORMS ARE
POSSIBLE WED AND THUR AS SUFFICIENT LL MOISTURE WILL BE IN PLACE
WITH WEAK STABILITY AND ADDITIONAL IMPULSES. THE BEST CHANCES FOR
STORMS WILL BE ACROSS THE WESTERN THIRD WED WITH CHANCES EXPANDING
TO THE ENTIRE FA THUR. UPPER RIDGE BUILDS INTO THE REGION THIS
WEEKEND, WITH DRY AND HOT CONDS EXPECTED. IMPRESSIVE TEMPS OF 35
TO ALMOST 40C AT H85 WITH CLOSE TO 6000 H5 HEIGHTS OVER WY, WILL
OFFER RECORD TO NEAR RECORD HIGHS WELL INTO THE 100S WITH 110 TO
115 POSSIBLE ON PORTIONS OF THE PLAINS, ESP SUNDAY AND MONDAY.
RIDGE BEGINS TO BREAKS DOWN ACROSS THE NORTHERN PLAINS THE MIDDLE
OF NEXT WEEK, WITH STORM CHANCES RETURNING AS THE ACTIVE NORTHERN
PERIPHERY OF THE RIDGE SETTLES SOUTH.
AVIATION
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)
ISSUED AT 525 PM MDT TUE JUL 7 2026
ISOLATED TO SCATTERED, POTENTIALLY SEVERE, THUNDERSTORMS WILL
CONTINUE TO DEVELOP OVER NORTHEAST WYOMING AND WESTERN SOUTH
DAKOTA LATE THIS AFTERNOON INTO EVENING BEFORE MOVING OVER MUCH OF
WESTERN SOUTH DAKOTA INTO THE OVERNIGHT HOURS. LARGE HAIL,
FREQUENT LIGHTNING, AND GUSTY/ERRATIC WINDS CAN BE EXPECTED WITH
ANY STRONGER CONVECTIVE CORES. TRANSIENT MVFR/IFR CONDITIONS ALSO
EXPECTED AROUND ANY HEAVIER PRECIPITATION CORES. CONDITIONS WILL
BEGIN TO IMPROVE AROUND 11Z AS STORMS DIMINISH AND MOVE OUT OF
THE REGION. ANOTHER ROUND OF STORMS WILL BEGIN TO DEVELOP OVER
NORTHEAST WYOMING AND WESTERN SOUTH DAKOTA STARTING AROUND 08/18Z
AND LASTING THROUGH THE REMAINDER OF THE FORECAST PERIOD.
UNR WATCHES/WARNINGS/ADVISORIES
SD...NONE.
WY...NONE.
DISCUSSION...JC
AVIATION...SCHULTZ
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