757 FXUS63 KDLH 250719 AFDDLHArea Forecast Discussion National Weather Service Duluth MN 219 AM CDT Thu Sep 25 2025
.KEY MESSAGES...
- Areas of fog burn off this morning, and a weak cold front could bring some sprinkles to Cook County and NW WI this afternoon.
- Mostly dry and warm through early to mid next week. A couple stray rain showers are possible along the border Saturday morning.
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.DISCUSSION... Issued at 218 AM CDT Thu Sep 25 2025
Another round of fog is across portions of the Northland this morning, but much more patchy in nature compared to the last several days. That should burn off into a hot and mostly sunny day with high temperatures soaring into the upper 70s to near 80F. A southwest breeze will reduce the moderating effect of Lake Superior, and for areas around the Twin Ports and South Shore, downslope warming may actually mean warmer temperatures right along the lake, by a couple of degrees compared to further inland.
A weak, mostly dry cold front should bring some partly cloudy skies and a switch in wind direction through this afternoon and evening. This front has about a 10-25% chance of bringing some sprinkles or isolated light rain to eastern Cook County and NW WI early this evening.
Northwest winds should bring temperatures back into the 60s to low 70s Friday (still above normal for this time of year). Another weak shortwave Friday night into Saturday could bring some sprinkles or a light rain shower to the Borderlands Saturday morning, but moisture is limited and chances remain low (10-30%).
An omega blocking pattern sets up late this week into early next week, which should lead to quite the dry precipitation anomaly. Little to no precipitation is expected through mid next week and temperatures remain above normal. Global models suggest that troughing could start to push into the Northern Plains mid to late next week, bringing chances of rain back to the Northland.
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.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 1225 AM CDT Thu Sep 25 2025
VFR conditions for the most part early this morning should persist for INL, DLH, and BRD. Patchy MVFR to IFR fog is possible through sunrise at HIB and HYR before we go to VFR at all sites. Southwest winds become northwest through the day today, with some gusts up to 20knots possible at times. Winds should calm overnight.
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.MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/... Issued at 218 AM CDT Thu Sep 25 2025
Areas of dense fog should burn off and pull back through this morning, but patchy areas may linger along the North Shore through this afternoon. Southwest winds pick up ahead of a dry cold front today and may gust around 15-20 knots, particularly along the North Shore and in the Apostle Islands. Observations will need to be monitored for the Grand Marais to Grand Portage zone for a possible short term Small Craft Advisory. Winds then turn to come out of the northeast behind the front Friday, again with some gusts of 15-20 knots possible for the Outer Apostle Islands.
For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at weather.gov/mqt.
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.DLH WATCHES/WARNINGS/ADVISORIES... MN...Dense Fog Advisory until 11 AM CDT this morning for MNZ021. WI...None. MARINE...Dense Fog Advisory until 11 AM CDT this morning for LSZ121- 140>143-146>148-150.
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DISCUSSION...Levens AVIATION...Levens MARINE...Levens
NWS DLH Office Area Forecast Discussion