554
FXUS63 KBIS 240913
AFDBIS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
413 AM CDT SUN MAY 24 2026
KEY MESSAGES
- WELL ABOVE AVERAGE TEMPERATURES THROUGH THE FIRST HALF OF
NEXT WEEK, WITH NEAR-RECORD HIGHS AROUND 90 TO 95 MEMORIAL DAY
AND TUESDAY.
- SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING
ALONG THE INTERNATIONAL BORDER, WITH BETTER CHANCES FOR
PRECIPITATION LATER THIS COMING WEEK.
DISCUSSION
ISSUED AT 405 AM CDT SUN MAY 24 2026
CURRENTLY, QUASI-ZONAL/WEST-NORTHWEST FLOW ALOFT BEHIND A
DEPARTING MID LEVEL S/WV TROUGH AND AHEAD OF A S/WV MID LEVEL
RIDGE. A LIGHT SOUTH/SOUTHEASTERLY LOW LEVEL FLOW THIS MORNING
WITH SURFACE HIGH PRESSURE TO OUR SOUTHEAST AND A SFC TROUGH
OVER EASTERN MONTANA NORTH INTO WESTERN SASKATCHEWAN. NOCTURNAL
LOW LEVEL JET INDUCED MID LEVEL CLOUDS HAVE FLARED UP THE PAST
COUPLE OF HOURS ACROSS PORTIONS OF WESTERN AND CENTRAL ND,
ALONG WITH SOME LIGHT RADAR RETURNS. FOR NOW, OPTED TO INTRODUCE
SLIGHT CHANCE POPS FOR A FEW HOURS, BUT OVERALL EXPECT IT TO BE
DRY THIS MORNING WITH CLOUD BASES AT OR ABOVE 10K FT AGL, ALONG
WITH LITTLE IF ANY FORCING ALOFT AND MINIMAL ELEVATED
INSTABILITY. WILL CONTINUE TO MONITOR.
QUASI-ZONAL FLOW TODAY AND TONIGHT, WITH AN EMBEDDED S/WV MOVING
EAST ACROSS THE REGION THIS AFTERNOON AND EVENING. CAMS AND
GLOBAL ENSEMBLES ARE MAINLY DRY, BUT DO HIGHLIGHT MY NORTHERN
TWO TIER COUNTIES WITH SOME LIGHT QPF, WHERE SOME ELEVATED
MUCAPE DIPS DOWN FROM THE PLAINS OF SOUTH CENTRAL CANADA. SPC
HIGHLIGHTS THIS AREA AS WELL WITH GENERAL THUNDER, SO OPTED TO
ADD SLIGHT CHANCE POPS ROUGHLY 21Z-03Z TODAY.
IN THE WAKE OF THIS EMBEDDED WAVE, UPPER LEVEL RIDGING AMPLIFIES
MONDAY INTO TUESDAY ACROSS THE NORTHERN PLAINS, IN RESPONSE TO A
POTENT UPPER LOW PROPAGATING SOUTH ALONG THE EASTERN
PACIFIC/WEST COASTAL REGION. STRONG SOUTHERLY LOW/MID LEVEL
FLOW WILL TRANSPORT THE WARMEST AIRMASS THUS FAR THIS YEAR INTO
OUR REGION, WITH DAYTIME HIGHS BOTH MON AND TUE IN THE MID 80S
TO MID 90S, NEAR RECORD VALUES FOR SOME LOCATIONS.
UPPER LOW SLOWLY MOVES INLAND THROUGH MID-WEEK, STRENGTHENING A
LEE-SIDE SURFACE LOW TO OUR WEST. AS A RESULT,
SOUTH/SOUTHEASTERLY WINDS INCREASE MON NIGHT INTO TUESDAY, WHICH
MAY RESULT IN ELEVATED FIRE WEATHER CONCERNS ACROSS THE WEST
DURING THE DAY TUESDAY AND WED. IN ADDITION, WILL LIKELY SEE A
NOCTURNAL LOW LEVEL JET BOTH MON AND TUE NIGHTTIME, SO CAN'T
RULE OUT EVENING/OVERNIGHT THUNDERSTORMS EACH NIGHT. RIGHT NOW
NBM KEEPS MON NIGHT DRY, BUT DOES INTRODUCE CONVECTION TUE
NIGHT.
THEREAFTER, ENSEMBLES FAVOR THE UPPER RIDGE GRADUALLY
WEAKENING/DISPLACED EAST, WHILE THE WESTERN CONUS LOW SLOWLY
STARTS TO INFLUENCE OUR REGION WHILE IT MOVES EAST AND MORPHS
INTO A LONG WAVE TROUGH. THIS SCENARIO WOULD FAVOR A COOLING
TREND AND INCREASING CHANCES FOR PRECIPITATION. LOTS OF
UNCERTAINTY STILL HOWEVER GIVEN A VERY DYNAMIC WEATHER PATTERN.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 1242 AM CDT SUN MAY 24 2026
MOSTLY CLEAR EARLY THIS MORNING WITH A FEW MID LEVEL CLOUDS
WEST. LIGHT AND VARIABLE WINDS AND A MOSTLY CLEAR SKY MAY STILL
PRODUCE SOME PATCHY FOG LATE TONIGHT, BUT LOW PROBABILITY SO
WILL NOT INCLUDE IN THE TERMINAL FORECASTS. VFR CONDITIONS
CONTINUE INTO SUNDAY, WITH PERHAPS A BIT MORE DIURNALLY DRIVEN
CU DURING THE DAY, THOUGH WILL CONTINUE TO BE HIGH BASED.
BIS WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...NH
AVIATION...NH
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