426
FXUS63 KBIS 270933
AFDBIS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
433 AM CDT MON OCT 27 2025
KEY MESSAGES
- WIDESPREAD ACCUMULATING RAINFALL TODAY FOR ALL BUT WEST
CENTRAL AND NORTHWESTERN NORTH DAKOTA. CHANCES FOR RAIN
DECREASE FROM WEST TO EAST TONIGHT THROUGH TUESDAY MORNING.
- THERE IS AN 80 PERCENT CHANCE FOR AT LEAST HALF AN INCH OF
RAINFALL FROM SOUTH CENTRAL NORTH DAKOTA NORTH/NORTHEAST INTO
THE TURTLE MOUNTAINS AND DEVILS LAKE REGION THROUGH MONDAY
NIGHT (THERE IS A 60 PERCENT FOR AT LEAST ONE INCH OF
RAINFALL FOR THIS SAME AREA AND TIME PERIOD).
- NEAR NORMAL TEMPERATURES ARE FORECAST THROUGH MUCH THE
UPCOMING WORK WEEK, ALONG WITH MAINLY DRY WEATHER CONDITIONS.
A CLIPPER SYSTEM MAY MOVE THROUGH LATER NEXT WEEK.
DISCUSSION
ISSUED AT 415 AM CDT MON OCT 27 2025
CURRENTLY, LONG WAVE UPPER LEVEL TROUGH OVER THE WESTERN AND
CENTRAL CONUS, WITH THE TROUGH AXIS ROUGHLY OVER THE CENTRAL AND
NORTHERN ROCKIES. STRONG SOUTHWEST FLOW ALOFT OVER THE NORTHERN
PLAINS, AHEAD OF AN INTENSIFYING S/WV OVER WYOMING IN THE LEFT
EXIT REGION OF A STRONG UPPER JET STREAK. THIS WAVE HAS
TRIGGERED AN AREA OF SFC LOW PRESSURE DEVELOPING ACROSS EASTERN
COLORADO/WYOMING EARLIER, AND WHICH HAS/WILL BECOME ORIENTATED
FROM SOUTHWEST TO NORTHEAST FROM WESTERN SD INTO SOUTH CENTRAL
AND NORTHEASTERN NORTH DAKOTA THIS MORNING AND AFTERNOON. THE
INITIAL SURGE OF SHOWERS CONTINUES TO EXPAND ALONG THE SFC
TROUGH/FRONTAL BOUNDARY FROM THE BLACK HILLS OF SD NORTH-
NORTHEAST ACROSS SOUTHWEST AND CENTRAL ND.
THE AFOREMENTIONED SFC TROUGH/FRONTAL BOUNDARY WILL BE THE
FOCUS FOR ACCUMULATING RAINFALL NOW THROUGH MUCH OF THIS
AFTERNOON AND EVENING, AS LEAD EMBEDDED WAVES CONTINUE TO LIFT
NORTH/NORTHEAST, FOLLOWED BY THE MAIN IMPULSE LIFTING THROUGH
THE REGION LATER TODAY AND TONIGHT. THROUGH 18Z, STRONG DIV Q
FORCING WILL COMBINE WITH LOW LEVEL FORCING/FRONTOGENESIS TO
RESULT IN WIDESPREAD RAINFALL, WITH ENHANCED AMOUNTS FOCUSED
ALONG THE FRONTAL BOUNDARY (PLACEMENT MENTIONED ABOVE) WHERE
NBM SHOWS AN 80 PERCENT CHANCE FOR AT LEAST HALF AN INCH OF
RAIN, AND A 60 PERCENT CHANCE FOR AN INCH. OUR RAIN CHANCES WILL
RATHER QUICKLY END FROM WEST TO EAST MONDAY NIGHT AS THE MAIN
FORCING PUSHES FARTHER EAST. WILL MAINTAIN A MENTION OF THUNDER
FOR SOUTHERN AREAS OF ND THIS AFTERNOON WHEN DECENT LIFT AND
ELEVATED INSTABILITY WILL BE PRESENT.
AFTERWARDS, S/WV RIDGING BUILDS INTO THE NORTH CENTRAL CONUS MID
WEEK, FOLLOWED BY A POTENTIAL CLIPPER/SHORT WAVE TROUGH PASSAGE
LATER IN THE WORK WEEK. PRECIPITATION CHANCES WITH THIS FEATURE
LOOK MINIMAL AT THIS TIME, WITH THE MAIN WEATHER ASSOCIATED WITH
THIS WAVE COLDER TEMPERATURES AND A PERIOD OF GUSTY WINDS.
OVERALL, TEMPERATURES ARE FAVORED TO BE NEAR NORMAL THROUGH
THURSDAY, THEN BRIEFLY COOL OFF WITH THE ABOVE MENTIONED WAVE
PASSAGE.
AVIATION /06Z TAFS THROUGH 06Z TUESDAY/
ISSUED AT 118 AM CDT MON OCT 27 2025
CONTINUED OVERCAST CONDITIONS WITH CEILINGS LOWERING AT ALL
TERMINALS THIS MORNING AS SHOWERS INCREASE IN COVERAGE OVER
WESTERN AND CENTRAL NORTH DAKOTA. MVFR TO PERIODS OF IFR
CONDITIONS WILL ACCOMPANY THE SHOWERS THIS MORNING AND INTO MON
EVENING. THIS WILL BE TRUE FOR ALL BUT KXWA WHICH LOOKS TO
REMAIN VFR THROUGH THE PERIOD. IMPROVING CONDITIONS ARE EXPECTED
FROM WEST TO EAST LATER IN THE DAY MONDAY AND THROUGH MONDAY
NIGHT.
BIS WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...ADAM/NH
AVIATION...NH
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