568 FXUS63 KDLH 240520 AFDDLHArea Forecast Discussion National Weather Service Duluth MN 1220 AM CDT Wed Sep 24 2025
.KEY MESSAGES...
- Areas of fog, some dense, likely to redevelop tonight. Dense Fog Advisories are in effect.
- A dry and mainly warm pattern will remain in place through the weekend and into early next week.
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.DISCUSSION... Issued at 226 PM CDT Tue Sep 23 2025
Surface high pressure extended from Hudson Bay into the Upper Midwest, Northern Plains and Northern Rockies early this afternoon. Most of the lingering low stratus had lifted along the fog from earlier this morning leaving mainly fair weather cumulus across the region. Skies will likely clear this evening with the loss of daytime heating. However, low level moisture remains in place and will again lead to the development of low stratus and fog overnight. While it is not expected to be as widespread as the past few nights, it will be dense in spots, especially from the Twin Ports to the Iron Range and Brainerd Lakes regions. Depending on how dense and widespread it is, Dense Fog Advisories may be needed.
High pressure will then control the remainder of the forecast period bringing dry conditions along with generally above normal temperatures. There will be a few weak cold frontal passages during this period with the strongest being Friday night into Saturday. While this looks to be a mainly dry passage, aside from some low pops along the International Border, there will be some cooler air that arrives behind this front for Saturday that will bring closer to normal highs in the 60s and lower 70s. Temperatures then warm back into the 70s for the remainder of the weekend and into early next week.
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.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 1220 AM CDT Wed Sep 24 2025
IFR to LIFR is expected at most sites into Wednesday morning, with improvements back to VFR conditions through mid morning. VFR conditions with light winds should persist through the day. Another round of fog may be possible Wednesday evening into Thursday morning, most likely for DLH and HYR.
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.MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/... Issued at 226 PM CDT Tue Sep 23 2025
High pressure will bring light winds at 10 knots or less to western Lake Superior tonight through Wednesday night. Winds will then turn southwesterly on Thursday with gusts to 15 knots from Gran Marais to Grand Portage. Main concern for the next few days will be another round of fog that will likely develop tonight and linger into Wednesday. This round is not expected to be as widespread and will likely dissipate quicker than this morning`s round.
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 MNZ019-026- 034>038. WI...Dense Fog Advisory until 11 AM CDT this morning for WIZ001>003- 006>008. MARINE...None.
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DISCUSSION...BJH AVIATION...Levens MARINE...BJH
NWS DLH Office Area Forecast Discussion