601
FXUS63 KBIS 222001
AFDBIS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
301 PM CDT WED APR 22 2026
KEY MESSAGES
- CRITICAL FIRE WEATHER CONDITIONS ACROSS MOST OF WESTERN AND
MUCH OF SOUTHERN NORTH DAKOTA INTO EARLY THIS EVENING.
- NEAR-RECORD HIGH TEMPERATURES IN THE 80S TO NEAR 90 FOR MOST
OF WESTERN THROUGH CENTRAL NORTH DAKOTA THIS AFTERNOON.
- 20 TO 30 PERCENT CHANCE OF SHOWERS AND A FEW THUNDERSTORMS
MAINLY SOUTH CENTRAL INTO EASTERN NORTH DAKOTA THIS EVENING.
FEW OF THESE COULD BE ON THE STRONGER SIDE WITH GUSTY WINDS.
AN ISOLATED STRONG STORM WITH GUSTY WINDS COULD BRUSH THE FAR
NORTHWEST EARLY THIS EVENING.
- MEDIUM TO HIGH CHANCES OF RAIN WEST AND LOW TO MEDIUM CHANCES
OF RAIN CENTRAL ON THURSDAY, FOLLOWED BY LOW CHANCES OF WRAP
AROUND SHOWERS, MOSTLY IN THE FORM OF SNOW, THURSDAY NIGHT
THROUGH SATURDAY.
- STRONG WEST TO NORTHWEST WINDS ARE LIKELY THURSDAY AND FRIDAY.
DISCUSSION
ISSUED AT 112 PM CDT WED APR 22 2026
AS OF 1 PM WINDS ACROSS WESTERN ND WERE MAINLY IN THE 15 TO 25
MPH RANGE, WITH HUMIDITIES 25 TO 35 PERCENT. WIND DIRECTIONS
WERE SOUTHERLY OVER SOUTHWEST ND TO EASTERLY OVER NORTHWEST ND.
ACROSS THE SOUTH CENTRAL WINDS WERE SOUTHEAST AT 15 TO 25 MPH
WITH HUMIDITIES AROUND 35 TO 40 PERCENT. ADDITIONAL FIRE WEATHER
INFO IS CONTAINED IN THE FIRE WEATHER SECTION.
AS THE MONTANA SURFACE LOW PUSHES INTO NORTHEAST MONTANA THIS
AFTERNOON, INCREASING MOISTURE IS BEING PULLED NORTHWARD FROM
THE CENTRAL PLAINS. A MODESTLY UNSTABLE, BUT CAPPED ATMOSPHERE
CURRENTLY OVER EASTERN SD WILL CONTINUE TO ADVECT NORTHWARD INTO
EASTERN ND THIS EVENING, WITH A BAND OF UNSTABLE AIR WORKING ALL
THE WAY BACK WEST INTO NORTHWEST ND. THESE TWO AREAS (NORTHWEST
ND) AND THE FAR SOUTH CENTRAL INTO THE JAMES RIVER VALLEY ARE
THE FOCUS FOR THUNDERSTORM ACTIVITY TONIGHT. IN THE FAR SOUTH
CENTRAL AND JAMES RIVER VALLEY, THE ATMOSPHERE IS EXPECTED TO
REMAIN CAPPED. HOWEVER, WITH INSTABILITY ALOFT AND AN INCREASING
LOW LEVEL JET THIS EVENING, THERE COULD BE SOME ISOLATED TO
SCATTERED ELEVATED CONVECTION THAT LIFTS NORTHEAST THROUGH THE
AREA. WITH STRONG ENVIRONMENTAL WINDS IN PLACE A STRONG TO
MARGINALLY SEVERE WIND GUST COULD MIX DOWN TO THE SURFACE. SOME
SMALL IS ALSO POSSIBLE. IN THE NORTHWEST, VERY STEEP LAPSE RATES
HAVE DEVELOPED OVER EASTERN MONTANA. ISOLATED HIGH BASED
THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON INTO THE EVENING,
MOSTLY OVER EASTERN MONTANA, BUT THERE IS A LOW THREAT THAT AN
ISOLATED STORM COULD BRUSH THE FAR WEST CENTRAL INTO NORTHWEST
ND, NEAR THE BORDER. THESE STORMS WOULD HAVE THE POTENTIAL FOR
WINDS GUST TO AROUND 60 MPH.
ON THURSDAY, THE SURFACE LOW LIFTS INTO SOUTHERN MANITOBA AND WE
SEE STRONG WIND DEVELOP OVER WESTERN NORTH DAKOTA THURSDAY
MORNING AND EVENTUALLY SPREAD INTO CENTRAL ND BY LATE MORNING OR
AFTERNOON. BUFKIT SOUNDINGS INDICATE THERE IS 50 TO 60 KNOTS OF
WIND AT THE TOP OF THE MIXING LAYER. THE QUESTION IS IF THIS CAN
MIX DOWN TO THE SURFACE. SOME OF OUR GENERAL GUIDANCE SUCH AS
THE ECMWF EFI ARE NOT REAL IMPRESSIVE WITH THE WINDS THURSDAY,
BUT CERTAINLY IN THE ADVISORY CRITERIA IN THE WEST. THE NAEFS SA
PAGES DOES SHOW A NICE 850MB AND 700MB JET INTO FAR SOUTHWEST ND
AROUND MIDDAY THURSDAY. GUIDANCE SHOWS THE SURFACE LOW LIFTING
NORTH IN THE AFTERNOON WITH THE SURFACE GRADIENT RELAXING A BIT,
SO THE CONFIDENCE IN STRONG WINDS ADVANCING EAST THROUGH CENTRAL
ND IS LOW AT THIS TIME. IF THIS DID OCCUR, IT WOULDN'T BE UNTIL
THURSDAY AFTERNOON AND INTO THE EVENING, THEREFORE WEEK DID NOT
EXTEND THE WIND ADVISORY THROUGH CENTRAL ND AND LATER SHIFTS
WILL HAVE THE CHANCE TO EVALUATE FURTHER.
EXCEPT FOR ANY CONVECTION THIS EVENING, AND MORNING WRAP AROUND
SHOWERS IN THE NORTHWEST THURSDAY MORNING THROUGH MID AFTERNOON,
MUCH OF THE DAY OVER MOST OF THE FORECAST AREA IS EXPECTED TO BE
DRY. MUCH OF THE WEST AND CENTRAL IS IN THE DRY SLOT LATE
TONIGHT, AND AS THE SURFACE AND UPPER LOW LIFTS NORTH AND
WOBBLES BACK TO THE WEST INTO SASKATCHEWAN, MUCH OF THE STATE
REMAINS WITHIN AN UNFAVORABLE POSITION FOR ANY SIGNIFICANT
PRECIPITATION THURSDAY INTO THURSDAY NIGHT. THEN AS WE GET INTO
LATE THURSDAY NIGHT THROUGH FRIDAY NIGHT, THE STACKED NOW DROPS
BACK SOUTH TO ALONG THE INTERNATIONAL BORDER. THIS WILL KEEP
SOME LOW PRECIPITATION CHANCES TO NORTHERN PORTIONS OF THE
FORECAST AREA. BY THIS TIME WE ARE COOL ENOUGH THAT THEY MAY
FALL AS EITHER RAIN OR SNOW. HOWEVER, ANY SIGNIFICANT
ACCUMULATIONS ARE NOT ANTICIPATED AT THIS TIME. SATURDAY AND
SUNDAY INTO NEXT WEEK WE SEE A SLOW GRADUAL INCREASE IN
TEMPERATURES WITH HIT AND MISS PRECIPITATION CHANCES.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
ISSUED AT 1227 PM CDT WED APR 22 2026
VFR CONDITIONS THROUGH MUCH OF THE TAF PERIOD AT ALL TAF SITES.
EXCEPTIONS WOULD BE POSSIBLE THUNDERSTORM ACTIVITY AROUND KXWA
LATE AFTERNOON/EARLY EVENING AND KJMS THIS EVENING. THESE SITES
HAVE THE HIGHEST PROBABILITY OF A THUNDERSTORM WITH LOWER VSBYS
IN A RAIN SHOWER. CLOUD BASES SHOULD REMAIN WELL ABOVE MVFR.
GUSTY AND ERRATIC WINDS ALSO POSSIBLE NEAR ANY THUNDERSTORMS.
OTHERWISE, MAINLY SOUTHEAST WINDS THIS AFTERNOON 15 TO 25 KNOTS.
WINDS SUBSIDE A BIT THIS EVENING BUT STRONGER WINDS ALOFT WILL
PRODUCE LLWS AT MOST SITES THIS EVENING. WINDS SHIFT SOUTHWEST
TONIGHT THE WESTERLY ON THURSDAY OVER WESTERN ND WITH WINDS
THERE PICKING UP TO 20 TO 35 KNOTS. MVFR CEILING WILL MOVE INTO
WESTERN ND THURSDAY MORNING BEHIND A COLD FRONT.
FIRE WEATHER
ISSUED AT 112 PM CDT WED APR 22 2026
RED FLAG CONDITIONS HAVE BEEN SLOW TO DEVELOP TODAY. AS OF 1 PM
WINDS ACROSS WESTERN ND WERE MAINLY IN THE 15 TO 25 MPH RANGE,
WITH HUMIDITIES 25 TO 35 PERCENT. WIND DIRECTIONS WERE
SOUTHERLY OVER SOUTHWEST ND TO EASTERLY OVER NORTHWEST ND.
ACROSS THE SOUTH CENTRAL WINDS WERE SOUTHEAST AT 15 TO 25 MPH
WITH HUMIDITIES AROUND 35 TO 40 PERCENT. SHORT TERM GUIDANCE
CONTINUES TO SUGGEST THAT WE WILL SEE RED FLAG CONDITIONS OVER
MUCH OF THE SOUTHWEST AND IN THE FAR SOUTH CENTRAL. THE
NORTHWEST AND AREAS IN THE SOUTHWEST ALONG LAKE SAKAKAWEA ARE A
LITTLE MORE UNCERTAIN AS TO IF WE WILL SEE RED FLAG CONDITIONS.
THE SLOWER WARMUP DUE TO THE INCREASED CLOUDS MAY BE DELAYING
THE MIX OUT AND RESULTING STRONGER WINDS AND LOWER HUMIDITIES.
HOWEVER, WITH THE MID AND HIGH CLOUDS BEGINNING TO CLEAR OUT,
AND SEVERAL MORE HOURS OF HEATING, WILL NOT MAKE ANY CHANGES TO
THE CURRENT RFW.
FOR THURSDAY, EXPECT WINDY TO VERY WINDY CONDITIONS OUT OF THE
WEST BEFORE BECOMING NORTHWEST IN THE AFTERNOON IN WESTERN ND.
LOW RAIN CHANCES ARE PRESENT ACROSS CENTRAL NORTH DAKOTA IN THE
AFTERNOON, WITH MEDIUM CHANCES IN THE WEST AND ESPECIALLY
NORTHWEST. THIS WILL MAINTAIN RELATIVE HUMIDITY VALUES IN EXCESS
OF 40 PERCENT ACROSS MOST OF THE STATE. THAT SAID, LOWER VALUES
DOWN TO AROUND 25 PERCENT ARE POSSIBLE MAINLY IN THE JAMES
RIVER VALLEY. WINDS IN THE JAMES RIVER VALLEY WILL BE INITIALLY
STRONG FROM THE SOUTH, THEN SHIFT SOUTHWEST TO WEST AND INCREASE
LATER IN THE AFTERNOON. NEAR CRITICAL FIRE WEATHER CONDITIONS
ARE EXPECTED IN THE JAMES RIVER VALLEY DUE TO THE STRONG WINDS
AND LOW HUMDITIES. SHOULD THE WIND SHIFT BE DELAYED, IT'S
POSSIBLE THAT CRITICAL FIRE WEATHER CONDITIONS COULD OCCUR. WILL
NEED TO MONITOR THE FAR SOUTH CENTRAL INTO THE JAMES RIVER
VALLEY THURSDAY FOR CRITICAL FIRE WEATHER CONDITIONS.
BIS WATCHES/WARNINGS/ADVISORIES
RED FLAG WARNING UNTIL 9 PM CDT /8 PM MDT/ THIS EVENING FOR
NDZ001-009-017>020-031>034-040>048-050-051.
WIND ADVISORY FROM 7 AM CDT /6 AM MDT/ TO 7 PM CDT /6 PM MDT/
THURSDAY FOR NDZ001-009-017-018-031>033-040-041-043-044.
WIND ADVISORY FROM 11 AM CDT /10 AM MDT/ TO 7 PM CDT /6 PM
MDT/ THURSDAY FOR NDZ002-003-010-019-020-035-042-046-055>062.
DISCUSSION...TWH
AVIATION...TWH
FIRE WEATHER...TELKEN
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