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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