950  
FXUS63 KFGF 180909 AAA  
AFDFGF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND FORKS ND  
341 AM CDT THU SEP 18 2025  
   
KEY MESSAGES
 
 
- PROLONGED PERIOD OF SHOWERS SPREADING NORTH TODAY AND PULLING OUT  
SATURDAY. 70 PERCENT OR HIGHER CHANCE OF 1 INCH OR MORE OF RAIN  
IN SOUTHEAST NORTH DAKOTA THRU FRIDAY NIGHT.  
 

 
   
DISCUSSION
 
 
ISSUED AT 315 AM CDT THU SEP 18 2025  
   
..SYNOPSIS
 
 
THE FOCUS THE NEXT 48 HOURS WILL BE MOVEMENT, DEVELOPMENT OF 500  
MB LOW OVER THE N PLAINS AND RAINFALL AMOUNTS. OVERALL IT IS NOT  
LOOKING LIKE RAINFALL AMOUNTS SPREAD OUT OVER 48 HOURS WILL BE  
ENOUGH TO CAUSE ANY IMPACTS IN TERMS OF FLOODING OR RIVER  
FLOODING. IMPACTS DUE TO GENERAL WET WEATHER PRESENT DUE TO  
IMPACTS TO ONGOING HARVEST, DEPENDING ON CROP, AND ALSO IMPACTS  
TO OUTDOOR ACTIVITIES.  
 
EARLY THIS THURSDAY MORNING, 500 MB LOW IS SLOWLY MOVING SOUTH  
AND NEAR SASKATCHEWAN MONTANA BORDER AND OVERALL IN THE PAST DAY  
IT HAS TRACKED SOUTHWEST. MEANWHILE 500 MB LOW IS SEEN IN  
CENTRAL SOUTH CENTRAL SOUTH DAKOTA WITH DEFORMATION ZONE  
RAINFALL IN SOUTH CENTRAL ND INTO WEST CENTRAL SD. DURING THE  
COURSE OF THE DAY TODAY AS THE UPPER LOW IN MONTANA/SASK BORDER  
REGION DROPS SOUTH AND UPPER LOW IN SOUTH DAKOTA MOVES NORTH AND  
THEN TONIGHT INTO FRIDAY EVENTUAL CONSOLODATION WITH UPPER LOW  
IN SOUTH CENTRAL OR NORTHEAST SD. RAIN SHOWERS WILL CONTINUE TO  
ADVANCE NORTH AND THEN WEST AROUND THE UPPER LOW TODAY AS AS THE  
UPPER LOW IN SD MOVES NORTH THERE WILL BE A GRADUAL NORTH  
ADVANCE OF SHOWERS. DRY SLOT MID LEVEL WORKING UP INTO SOUTHEAST  
AND EAST CENTRAL SD AND SOUTHWEST MN MAY MOVE INTO SOUTHEAST  
FCST AREA AND FOR A TIME THIS AFTERNOON OR EVENING LIMIT  
PRECIPITATION. BUT ALSO EXPECT AT THAT TIME LIKELY LOWER CLOUDS  
AND POTENTIAL DRIZZLE IN THAT DRY SLOT AREA. THERE IS SOME 500  
J/KG CAPE IN THE DRY SLOT AREA NEAR THE ND/MN/SD BORDER REGION  
AT 00Z SO A FEW T-STORMS ARE POSSIBLE. I DONT FORSEE ANY STRONG  
OR SEVERE STORMS. ANYTIME YOU HAVE AN UPPER LOW NEARBY HAVING A  
BRIEF FUNNEL CLOUD ISNT UNUSUAL.  
 
MODELS IN AGREEMENT IN TAKING A SEPARATE SHORT WAVE IN KANSAS  
EARLY THIS MORNING NORTHEAST INTO WESTERN IOWA AND THEN  
NORTHWARD TONIGHT INTO FRIDAY, AND WITH THIS WILL BE A SURGE OF  
DEEPER MOISTURE AND INCREASED RAINFALL RATES SPREADING INTO THE  
AREA LATER TONIGHT INTO FRIDAY.  
 
UPPER WAVE DOES SEEM TO BE MORE NORTHEAST NOW INTO NW ONTARIO  
WITHY SHOWERS SATURDAY FOCUSED IN NORTHERN MN INTO NW ONTARIO  
AND EASTERN MANITOBA. RAIN CHANCES MAY LINGER INTO SUNDAY IN  
NORTH CENTRAL MN.  
 
NEXT WEEK IS INDICATING AN UPPER TROUGH MOVING INTO B.C. WITH A  
BROAD UPPER RIDGE BUILDING INTO SOUTH CENTRAL CANADA AND NORTH  
CENTRAL US ON THE NORTH SIDE OF AN UPPER LOW TUES-THU PERIOD.  
 

 
   
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/
 
 
ISSUED AT 1051 PM CDT WED SEP 17 2025  
 
CONDITIONS ARE EXPECTED TO GO DOWN HILL DRAMATICALLY OVERNIGHT  
INTO THURSDAY MORNING, WITH VFR GIVING WAY TO MVFR, EVENTUALLY  
TURNING TO IFR AT MULTIPLE SITES. EVEN IF IFR IS NOT PREVAILED  
AT A SPECIFIC SITES TAF, POCKETS OF IFR WILL LIKELY BE ROAMING  
AROUND THROUGHOUT THURSDAY, LEADING TO BRIEF INSTANCES OF LOWER  
CEILINGS. AT THIS TIME, IT REMAINS TOO EARLY TO ADD A TEMPO OR  
PROB30 TO ACCOUNT FOR THIS OUTSIDE OF WHERE IFR IS EXPECTED TO  
PREVAIL. SHOWERS WILL ALSO BE PASSING THROUGH. VISIBILITIES  
WILL CHANGE VERY LITTLE IN AREAS WHERE IT IS RAINING VS AREAS  
WHERE IT IS NOT, AS A MIX OF DRIZZLE/MIST WILL LIKELY PERSIST IN  
BETWEEN THE PERIODS OF RAIN. CEILINGS WILL LOWER AGAIN THURSDAY  
NIGHT. HOW LOW THEY GO IS UNCERTAIN, BUT PLACES WHERE WE SEE  
PERSISTENT IFR THURSDAY AFTERNOON (SUCH AS KDVL) COULD SEE LIFR  
BY THURSDAY NIGHT.  
 

 
   
FGF WATCHES/WARNINGS/ADVISORIES
 
 
ND...NONE.  
MN...NONE.  
 

 
 

 
 
DISCUSSION...RIDDLE  
AVIATION...RAFFERTY  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab ND Page
The Nexlab MN Page Main Text Page