137  
FXUS63 KDLH 301744  
AFDDLH  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE DULUTH MN  
1244 PM CDT WED JUL 30 2025  
   
KEY MESSAGES  
 
- CANADIAN WILDFIRE SMOKE REMAINS OVER THE NORTHLAND, WITH  
REDUCTIONS TO AIR QUALITY AND VISIBILITY THROUGH THE END OF  
THE WEEK. AIR QUALITY ALERTS ARE IN EFFECT FOR ALL OF THE  
NORTHLAND THROUGH SATURDAY.  
 
- SEASONABLE TEMPERATURES AND DRIER CONDITIONS THROUGH THE END  
OF THE WEEK.  
 
- CHANCES FOR SHOWERS AND STORMS RETURN LATE THIS WEEKEND INTO  
EARLY NEXT WEEK.  
 
 
   
DISCUSSION  
 
ISSUED AT 319 AM CDT WED JUL 30 2025  
 
SURFACE HIGH PRESSURE IS CURRENTLY CENTERED TO OUR NORTHWEST  
OVER SOUTH CENTRAL CANADA, WITH A FRONT STRETCHING FROM THE  
PACIFIC NORTHWEST THROUGH THE CENTRAL PLAINS AND BACK  
NORTHEASTWARD THROUGH THE SOUTHERN GREAT LAKES. ALONG THIS  
BOUNDARY, A CLUSTER OF THUNDERSTORMS IN CENTRAL IOWA IS  
PROVIDING A SIGNIFICANT CIRRUS CLOUD SHIELD THAT IS SPREADING  
INTO THE NORTHLAND. CANADIAN WILDFIRE SMOKE REMAINS OVER THE  
AREA EARLY THIS MORNING, WITH SOME REDUCTIONS IN VISIBILITIES  
NOTED ON REGIONAL OBS.  
 
SURFACE HIGH PRESSURE WILL SLIDE TO THE SOUTHEAST TODAY AND  
SETTLE OVER THE NORTHLAND THROUGH THE END OF THE WEEK. THIS WILL  
KEEP CONDITIONS DRY, WITH SEASONABLE TEMPERATURES. PRIMARY  
WEATHER CONCERN THROUGH THE END OF THE WEEK WILL BE CANADIAN  
WILDFIRE SMOKE SPREADING SOUTH ACROSS THE NORTHLAND AS NORTHWEST  
FLOW ALOFT AND SEASONABLY STRONG SURFACE HIGH PRESSURE REMAIN  
OVER THE REGION. WINDS WILL BE LIGHT FOR MUCH OF THE WORK WEEK  
WHICH WILL LIMIT SMOKE DISPERSION. THE SMOKE WILL LEAD TO  
REDUCTIONS IN AIR QUALITY AND VISIBILITY. MIGHT SEE SOME  
IMPROVEMENT ACROSS THE ARROWHEAD AND ALONG THE INTERNATIONAL  
BORDER THURSDAY, AS GREATEST SMOKE CONCENTRATIONS SHIFT  
SOUTHWARD DUE TO LOW LEVEL WINDS BECOMING NORTHERLY TO  
NORTHEASTERLY. AIR QUALITY ALERTS FROM THE MPCA REMAIN IN  
EFFECT THROUGH SATURDAY IN THE MN PORTION OF THE NORTHLAND. AIR  
QUALITY ALERTS FROM THE WISCONSIN DNR REMAIN IN EFFECT UNTIL  
MIDDAY ON THURSDAY IN THE NORTHWEST WI PORTION OF THE NORTHLAND.  
SEE THOSE ALERTS FOR MORE DETAILS.  
 
A SHORTWAVE WILL HELP DAMPEN THE RIDGE AXIS TO OUR WEST THIS WEEKEND,  
WITH A SURFACE LOW DEVELOPING LEE OF THE ROCKIES. GIVEN THE  
STRENGTH OF SURFACE HIGH PRESSURE, NOW SHIFTED TO OUR EAST, THE  
SURFACE LOW STRUGGLES TO PUSH EASTWARD. REGARDLESS, SOUTHERLY  
LOW LEVEL FLOW ON THE WEST SIDE OF THE SURFACE HIGH WILL BRING  
RETURN OF MOISTURE NORTHWARD, WITH ISOLATED TO SCATTERED SHOWER  
AND STORM CHANCES RETURNING EARLY NEXT WEEK.  
 
 
   
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/  
 
ISSUED AT 1244 PM CDT WED JUL 30 2025  
 
WILDFIRE SMOKE HAS SETTLED ACROSS THE REGION AND IS LEADING TO  
VFR TO MVFR CEILINGS AND VISIBILITIES. WITH HIGH PRESSURE IN  
PLACE AND SMOKE EXPECTED TO LINGER INTO THE WEEKEND, HAVE KEPT A  
PERSISTENCE FORECAST IN PLACE. CONDITIONS MAY IMPROVE AT TIMES,  
BUT OVERALL VISIBILITY REDUCTIONS WILL PREVAIL. SOME FOG MAY  
FORM AT HIB IN THE HOURS AROUND SUNRISE THURSDAY, ESPECIALLY  
WITH THE SMOKE PROVIDING PARTICULATE MATTER FOR CONDENSATION.  
IFR OR LOWER CONDITIONS WILL BE POSSIBLE THERE BEFORE IMPROVING  
TO MVFR AFTER SUNRISE.  
 
 
   
MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/  
 
ISSUED AT 319 AM CDT WED JUL 30 2025  
 
WINDS, INCLUDING GUSTS, ARE EXPECTED TO BE AT OR LESS THAN 15 KTS  
AND WAVES OF AROUND A FOOT OR LESS THROUGH LATE THIS WEEK AS A  
HIGH PRESSURE APPROACHES AND MOVES OVER WESTERN LAKE SUPERIOR.  
THE STRONGEST OF THESE WINDS SHOULD BE THIS AFTERNOON AND  
EVENING IN THE HEAD OF THE LAKE AND ALONG THE SOUTH SHORE AS  
WINDS BLOW FROM THE NORTHEAST. WAVES COULD BRIEFLY JUMP TO 1 TO  
2 FEET AT THE HEAD OF THE LAKE AND ALONG THE SOUTH SHORE FROM  
THE FUNNELED WINDS THIS AFTERNOON AND EVENING. TEMPERATURES  
WILL BE MORE SEASONABLE, AS WELL.  
 
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...NONE.  
 
 
 
 
 
DISCUSSION...HA  
AVIATION...BJH  
MARINE...HA  
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