567  
FXUS63 KDLH 172325  
AFDDLH  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE DULUTH MN  
625 PM CDT WED SEP 17 2025  
   
KEY MESSAGES  
 
- OFF AND ON RAIN CHANCES RETURN THIS EVENING 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 COOL TOMORROW 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 THURSDAY AND  
FRIDAY.  
 
 
   
DISCUSSION  
 
ISSUED AT 241 PM CDT WED SEP 17 2025  
 
CURRENT CONDITIONS/TODAY:  
 
MOSTLY QUIET ACROSS MOST THE NORTHLAND THIS AFTERNOON WITH  
SATELLITE AND RADAR SHOWING SHOWERS AND STORMS OVER SOUTH  
CENTRAL MN. THERE IS A LINE OF CONVERGENCE EXTENDING FROM NORTH  
OF THE TWIN CITIES INTO NORTHERN PRICE WHERE A FEW TOWERS ARE  
BEGINNING TO GROW WHICH WILL LEAD TO SOME ISOLATED STORMS. ALOFT  
WE STILL HAVE AN OMEGA BLOCKING PATTERN IMPACTING OUR REGION  
WITH A PAIR OF UPPER LEVEL LOWS TRAPPED OVER THE NORTHERN PLAINS  
AND CANADIAN PRAIRIES. ON EITHER SIDE OF THE LOWS WE HAVE  
ANTICYCLONIC FLOW LOCKING THE NORTHLAND INTO OUR ABNORMALLY WARM  
TEMPERATURES. ALPW ALSO HIGHLIGHTS A FAIR AMOUNT OF MOISTURE  
EXTENDING ACROSS THE UPPER MIDWEST.  
 
RAIN SET UP THROUGH THE WEEKEND:  
 
THE PAIR OF UPPER LEVEL LOWS TO OUR WEST CONTINUE TO SLOWLY PIN  
WHEEL AROUND EACH OTHER. THE MORE VERTICALLY STACKED ONE OVER SD  
WILL START TO ENCROACH MORE ACROSS MN AS ITS WARM FRONT BEGINS TO  
MARCH SOUTH TO NORTH INTO THE NORTHLAND. THE INCREASED ISENTROPIC  
ASCENT MIXED WITH OUR MOIST ATMOSPHERE WILL IN TURN LEAD TO  
INCREASED PRECIPITATION CHANCES OVER THE NEXT SEVERAL DAYS.  
 
CAMS SUGGEST THE FIRST WAVE OF PRECIPITATION ENTERS FROM THE SOUTH  
AFTER 7 PM AND CONTINUES NORTH THROUGH THURSDAY MORNING. AFTER THIS  
FIRST WAVE WE WILL STILL MAINTAIN RAIN CHANCES (20-30%) THROUGH THE  
DAY AS POCKETS OF SHOWERS WILL STILL BE POSSIBLE UNDER OUR SOUTHERLY  
LOW LEVEL FLOW. THE BETTER CHANCES FOR RAIN THURSDAY AFTERNOON WILL  
LIKELY BE CLOSER TO THE SURFACE CONVERGENCE NEAR THE LOW AS IT MOVES  
OUT OF THE SOUTHERN PORTIONS OF THE RED RIVER VALLEY TOWARDS THE  
BRAINERD LAKES REGION. DETAILS ON TIMING AND PLACEMENT OF  
PRECIPITATION GETS A LITTLE MORE MURKY BEYOND FRIDAY. WHILE THE  
OMEGA BLOCKING PATTERN DOES BREAK DOWN WE ARE STILL LEFT WITH  
SEVERAL UPPER LEVEL LOWS MOVING THROUGH THE AREA FOR THE WEEKEND. AS  
SUCH WE MAINTAIN POPS OF 40-60% THROUGH SUNDAY.  
 
ACTIVE WEATHER IMPACTS:  
 
WITH THE ONGOING RAIN CHANCES THROUGH THE WEEKEND WE WILL HAVE SOME  
INTERMITTENT CHANCES FOR THUNDERSTORMS AT TIMES. INSTABILITY WILL  
VARY BETWEEN 0-700 J/KG AND SHEAR IS ON THE WEAKER SIDE LEADING TO  
NO SEVERE STORM THREAT. WE DO LOOK TO INTRODUCE SOME BETTER SHEAR  
SUNDAY AFTERNOON, BUT THERE REMAINS TOO MUCH UNCERTAINTY ON SURFACE  
FEATURES TO WORRY ABOUT SEVERE WEATHER AT THIS TIME. WITH ACTIVE  
WEATHER BEING PRESENT FOR SUCH AN EXTENDED PERIOD OF TIME WE COULD  
HAVE SOME CONCERN FOR EXCESSIVE RAINFALL. WPC DOES HAVE OUR REGION  
HIGHLIGHTED IN A MARGINAL RISK THROUGH SATURDAY. PWATS OVER THE  
REGION ARE NEAR THE 90TH PERCENTILE OF GUIDANCE WITH THE MORNING  
SOUNDING OUT OF MPX HAVING AROUND 1.38" MODEL SOUNDINGS ALSO SHOW A  
WARM CLOUD DEPTH OF OVER 10,000FT WHICH WILL ALLOW FOR BIGGER RAIN  
DROPS. THE WIDELY SCATTERED NATURE WILL BE WHAT PREVENTS WIDESPREAD  
FLOODING BUT SOME HEAVY RAINFALL AT TIMES WILL BE POSSIBLE.  
 
TEMPERATURES:  
 
ONE MORE WARM DAY OUT THERE TODAY, ALTHOUGH THE CLOUD COVER ACROSS  
FAR NORTHERN MN HAS LIMITED HOW QUICKLY TEMPERATURES WERE EXPECTED TO  
INCREASE, SO WE HAVE PULLED THE AFTERNOON TEMPS DOWN A FEW DEGREES  
WITH THIS FORECAST UPDATE. AS THE AFOREMENTIONED SYSTEM GRAVITATES  
CLOSER TO THE NORTHLAND WE WILL SEE WINDS DRAWN TOWARD IT OUT OF THE  
EAST. THIS WILL PROVIDE THE REGION WITH MUCH COOLER TEMPERATURES  
WITH HIGHS IN THE 60S AND SOME IN THE 50S BY LAKE SUPERIOR. THESE  
WINDS WILL ALSO LEAD TO FUNNELING AT THE HEAD OF THE LAKE WITH  
INCREASED WAVE ACTION EXPECTED. RIP CURRENTS WILL LIKELY BE A  
PROBLEM FOR THURSDAY AND FRIDAY. LOOK FOR TEMPERATURES TO CLIMB BACK  
INTO THE 70S ON SUNDAY WHEN SOUTHERLY WINDS RETURN.  
 
 
   
AVIATION /00Z TAFS THROUGH 00Z FRIDAY/  
 
ISSUED AT 622 PM CDT WED SEP 17 2025  
 
SEASONABLY DEEP MOISTURE ADVECTION ALONG A STATIONARY FRONT IS  
CREATING A LINE OF THUNDERSTORMS THIS EVENING SOUTH OF US HWY 2.  
EXPECT LIMITED AND PERIODIC IMPACTS TO MAINLY VISIBILITY FROM  
THE HEAVY RAINFALL THIS EVENING FROM THOSE SHOWERS. CEILINGS  
REMAIN VFR THROUGH 09-12Z BEFORE QUICKLY DECREASING TO MVFR AS  
THE NEXT ROUND OF RAINFALL LIFTS NORTHWARD AGAIN FOR THURSDAY  
DAYTIME RAIN SHOWERS. EASTERLY WINDS QUICKLY INCREASE FOR THE  
LAKE SHORELINE TERMINALS, ESPECIALLY IN THE TWIN PORTS FROM 08  
TO 10Z TONIGHT. GUSTY EASTERLY WINDS 20-30 KNOTS WILL THEN  
OCCUR THROUGH THE REST OF THE TAF PERIOD FOR THOSE TERMINALS.  
 
 
   
MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/  
 
ISSUED AT 241 PM CDT WED SEP 17 2025  
 
NORTHEASTERLY WINDS ARE EXPECTED TO RAMP UP LATER THIS EVENING WITH  
GUSTS IN EXCESS OF 25 KNOTS AT TIMES. A SMALL CRAFT ADVISORY HAS  
BEEN ISSUED FOR ALL OF THE NEAR-SHORE WATERS. THIS FLOW IS EXPECTED  
TO PERSIST THROUGH FRIDAY WITH WINDS TAPERING OFF LATE FRIDAY. WAVES  
WILL BUILD TO 3-6 FT AND WILL BE SLOWER TO DIMINISH AS WE HEAD INTO  
SATURDAY. ADDITIONALLY, WE WILL BE IN AN ACTIVE WEATHER PATTERN WITH  
OFF AND ON RAIN CHANCES WITH EMBEDDED THUNDERSTORMS AT TIMES  
BEGINNING TONIGHT AND LASTING THROUGH THE WEEKEND.  
 
FOR THE OPEN WATER DISCUSSION, REFER TO THE NWS MARQUETTE AREA  
FORECAST DISCUSSION AT WEATHER.GOV/MQT.  
 
 
   
DLH WATCHES/WARNINGS/ADVISORIES  
 
MN...NONE.  
WI...NONE.  
MARINE...SMALL CRAFT ADVISORY FROM 4 AM THURSDAY TO 7 AM CDT FRIDAY FOR  
LSZ121-148.  
SMALL CRAFT ADVISORY FROM 6 AM THURSDAY TO 1 AM CDT SATURDAY  
FOR LSZ140-141.  
SMALL CRAFT ADVISORY FROM 4 AM THURSDAY TO 1 AM CDT SATURDAY  
FOR LSZ142>147-150.  
 
 
 
 
 
DISCUSSION...BRITT  
AVIATION...NLY  
MARINE...BRITT  
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