910  
FXUS63 KDLH 181138  
AFDDLH  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE DULUTH MN  
638 AM CDT THU SEP 18 2025  
   
KEY MESSAGES  
 
- OFF AND ON RAIN CHANCES INCREASE TODAY AND TONIGHT AND WILL  
PERSIST THROUGH THE WEEKEND.  
 
- A FEW THUNDERSTORMS WILL BE POSSIBLE THROUGH THE WEEKEND BUT  
NO SEVERE WEATHER IS EXPECTED AT THIS TIME.  
 
- TEMPERATURES TURN COOLER FOR TODAY WITH EASTERLY WINDS  
RETURNING. HIGHS WILL BE IN THE 60S AND 70S WITH SOME 50S BY  
THE LAKE.  
 
- INCREASED RISK OF RIP CURRENTS IN THE TWIN PORTS FOR TODAY  
AND FRIDAY.  
 
 
   
DISCUSSION  
 
ISSUED AT 407 AM CDT THU SEP 18 2025  
 
A SLOW MOVING UPPER LOW OVER THE NORTHERN HIGH PLAINS WILL  
SLOWLY SPIN OVER THE DAKOTAS THE NEXT COUPLE DAYS, KEEPING THE  
NORTHLAND IN ON AND OFF RAIN CHANCES THROUGH THE WEEKEND UNDER  
GLOOMY SKIES. THERE WILL BE SHORTWAVES EMBEDDED WITHIN THIS  
UPPER LOW, THAT WILL ROTATE ACROSS THE REGION TODAY THROUGH  
SATURDAY. THESE WAVES, IN COMBINATION WITH A PLUME OF GULF  
MOISTURE AND BROAD ISENTROPIC LIFT EXTENDING ALL THE WAY UP TO  
HERE WILL HELP TO PUSH WAVES OF PRECIPITATION ACROSS THE  
FORECAST AREA FOR THE NEXT FEW DAYS. DIGGING INTO THE DETAILS  
THIS MORNING, MOISTURE IS STILL BEING PUSHED INTO THE AREA, AS  
IS BEING SHOWN BY THE DIFFERENCE IN AVAILABLE MOISTURE BETWEEN  
THE 00Z SOUNDING AT KMPX WITH A PWAT VALUES OF 1.50IN VS KINL  
WITH A PWAT OF 0.88IN, AND A LARGE DRY LAYER BETWEEN 400 AND  
700MB. WE EXPECT THE MOISTURE AVAILABLE FOR PRECIPITATION TO  
GRADUALLY INCREASE THROUGH THE DAY TODAY, WITH PRECIPITATION  
CHANCES GRADUALLY INCREASING FROM SOUTH TO NORTH TODAY AND  
TONIGHT. THE MAIN UPPER LOW IS A BIT TOO FAR WEST FOR A COHERENT  
WAVE OF PRECIPITATION, BUT WITH THE CONSISTENT WARM MOIST  
ADVECTION GOING ON, I EXPECT SCATTERED SHOWERS AND ISOLATED  
STORMS TO MOVE ACROSS THE FORECAST AREA FROM SOUTH TO NORTH  
TODAY THROUGH TONIGHT. FRIDAY THE UPPER LOW GETS A LITTLE CLOSER  
AND OUR MOISTURE WILL BE MUCH HIGHER, SO I EXPECT THE HIGHEST  
PRECIPITATION CHANCES ON FRIDAY THROUGH SATURDAY, WITH  
PRECIPITATION CHANCES LIKELY FOR A LARGE PORTION OF THE FORECAST  
AREA. THIS UPPER LOW FINALLY EASES OFF TO THE EAST ON SUNDAY,  
ALLOWING THE PRECIPITATION CHANCES TO DECREASE ON SUNDAY. THE  
CLOUD COVER, PRECIPITATION CHANCES AND EASTERLY FLOW OFF LAKE  
SUPERIOR WILL KEEP OUR TEMPERATURES NEAR TO BELOW NORMAL VALUES  
FOR THIS TIME OF YEAR, WITH HIGHS ONLY IN THE 60S TODAY AND  
FRIDAY, WITH SOME 50S ALONG THE NORTH SHORE. TEMPERATURES WILL  
MODERATE THROUGH THE WEEKEND AS THE UPPER LOW MOVES NORTHEAST OF  
THE AREA. THIS WILL ALSO KEEP OVERNIGHT LOWS ON THE ABOVE  
NORMAL SIDE, WITH ONLY THE TIP OF THE ARROWHEAD DIPPING INTO THE  
40S AND THE REMAINING AREAS STAYING IN THE 50S.  
 
AS WE GET INTO EARLY NEXT WEEK, THE UPPER LOW WILL GET PUSHED  
OFF TO THE EAST BY A SHORT RIDGE, EVEN AS ANOTHER UPPER LOW  
MOVES ACROSS THE NORTHERN ROCKIES AND DIVES SOUTHEAST INTO THE  
MID MISSISSIPPI RIVER VALLEY BY THE MIDDLE PART OF NEXT WEEK.  
THIS WILL LEAVE US WITH THE IN-BETWEEN TROUGHING WITH SMALL  
PRECIPITATION CHANCES FOR MONDAY AND TUESDAY, THEN TRANSITIONING  
INTO MOSTLY DRY CONDITIONS FOR WEDNESDAY AND THURSDAY OF NEXT  
WEEK. TEMPERATURES RETURN TO NEAR TO ABOVE NORMAL FOR EARLY NEXT  
WEEK.  
 
 
   
AVIATION /12Z TAFS THROUGH 12Z FRIDAY/  
 
ISSUED AT 635 AM CDT THU SEP 18 2025  
 
GRADUALLY DETERIORATING CONDITIONS THIS MORNING WILL CONTINUE  
TO WORSEN AS AN AREA OF SHOWERS AND STORMS SPREADS TOWARDS THE  
AREA FROM THE SOUTHWEST. A MIXTURE OF VFR, MVFR AND IFR CEILINGS  
WILL GRADUALLY BECOME ALL MVFR THIS MORNING, THOUGH KDLH MAY  
REMAIN IFR AS NORTHEAST WINDS CAUSE CEILINGS LOWER THERE. RAIN  
SHOWER CHANCES ARE EXPECTED TO GRADUALLY INCREASE IN COVERAGE  
THROUGH THE DAY TODAY AND TONIGHT. CEILINGS SHOULD LIFT BACK TO  
VFR FOR KHIB, KINL, KBRD AND KHYR AROUND 21Z, ONLY TO LOWER  
AGAIN AFTER 00Z, DIPPING BACK INTO IFR FOR KDLH AND KBRD.  
EASTERLY WINDS QUICKLY INCREASE FOR KDLH THIS MORNING, BECOMING  
GUSTY TO AROUND 25 KNOTS THROUGH THE REST OF THE TAF PERIOD. THE  
OTHER TERMINALS WILL ALSO BE GUSTY OUT OF THE EAST, BUT SHOULD  
STAY UNDER 20KTS.  
 
 
   
MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/  
 
ISSUED AT 407 AM CDT THU SEP 18 2025  
 
NORTHEAST WINDS WILL GRADUALLY INCREASE TODAY AS A LOW PRESSURE  
SYSTEM ADVANCES TOWARDS THE AREA, THEN SLOWLY LIFTS NORTH ACROSS  
WESTERN MINNESOTA TODAY THROUGH SATURDAY. THIS WILL KEEP WINDS  
ON THE LAKE OUT OF THE NORTHEAST TO EAST DURING THIS TIME  
FRAME. THE STRONGEST WINDS WILL BE FOUND AS THE LOW CENTER MOVES  
TOWARDS THE AREA TODAY AND AGAIN ON FRIDAY, WITH WIND GUSTS  
APPROACHING GALE FORCE WHERE WINDS ACCELERATE INTO THE SOUTHWEST  
ARM OF THE LAKE AROUND THE TWIN PORTS. SHORT TERM GALE WARNINGS  
MAY BE NEEDED THIS AFTERNOON.  
 
FOR THE OPEN WATER DISCUSSION, REFER TO THE NWS MARQUETTE AREA  
FORECAST DISCUSSION AT WEATHER.GOV/MQT.  
 
 
   
DLH WATCHES/WARNINGS/ADVISORIES  
 
MN...BEACH HAZARDS STATEMENT THROUGH THIS EVENING FOR MNZ037.  
WI...BEACH HAZARDS STATEMENT THROUGH THIS EVENING FOR WIZ001.  
MARINE...SMALL CRAFT ADVISORY UNTIL 7 AM CDT FRIDAY FOR LSZ121-148.  
SMALL CRAFT ADVISORY UNTIL 1 AM CDT SATURDAY FOR LSZ140>147-  
150.  
 
 
 
 
 
DISCUSSION...LE  
AVIATION...LE  
MARINE...LE  
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