textproduct: Marquette

KEY MESSAGES

- Fog and freezing fog develops tonight, becoming dense at times especially over the interior-western UP. A Dense Fog Advisory has been issued for Gogebic and Iron counties late tonight into Saturday morning.

- Well above normal temperatures settle over the region through weekend, with highs above freezing each day.

- A series of winter storm system may impact the Great Lakes next week. Uncertainty remains high at this time regarding the track of the systems and impacts.

DISCUSSION

Issued at 258 PM EST Fri Feb 13 2026

A weak frontal boundary and shortwave are passing east. Behind it, dry midlevel air working in has allowed for clearing skies from west to east. In turn, temperatures across most of the UP have been able to climb a few degrees higher than expected, with most of the UP hover in the lower to mid 40s. In the Keweenaw and in the far eastern UP, where clouds were slower to clear, temperatures so far have climbed only as high as the mid 30s. Meanwhile, winds continue to decrease this afternoon and evening behind the exiting wave. Mainly clear skies and light winds linger into the evening while a sharp subsidence inversion develops over the top of our snowpack. This, in combination with abundant lower-level moisture courtesy of daytime snowmelt will contribute to fog development at least over the western half of the UP tonight. This may turn dense at times, particularly nearer to the WI border where hi-res ensemble guidance highlights a 60-80% chance for visibility below a quarter mile for most of the night. As temperatures plummet into the teens, freezing fog will be possible, which may lead to slick spots on the roadways. Re-freezing of melted snow on roadways could also lead to some patchy slick spots...but will note that webcams across the UP are showing dry roads for the most part. A Dense Fog Advisory has been issued for Gogebic and Iron counties given the greater confidence in dense fog there.

High pressure in place will allow for another quiet day Saturday while winds back southerly ahead of another approaching shortwave. More breaks in the clouds are expected by Saturday afternoon in the western half of the UP, but soundings over the eastern UP show little sign of that low cloud cover mixing out. This should lead to a rather large spread in temperatures, with highs only in the lower- mid 30s in the eastern UP and in the lower-mid 40s in the west. Midlevel cloud cover my pick up Saturday night as the aforementioned wave ripples through. Sunday and Monday will be near copies of Saturday, with generally quiet weather and just a weak, moisture- starved shortwave tracking through. Temperatures start in the mid 20s each morning, climbing into the upper 30s to lower 40s each afternoon. Stubborn lower-level inversions present in model soundings also indicate a potential for morning fog/freezing fog early Sunday and early Monday.

Western troughing finally begins to lift through the Plains and into the Midwest/Great Lakes Tuesday/Wednesday. Deterministic operational models continue to hone in an on active mid to late week period, with a couple Colorado lows potentially ejecting out of the Plains and heading towards the Great Lakes. However, run-to-run and model- to-model consistency is not quite there yet to provide any definitive answers, as particular track and timing would have significant impacts on both precipitation type and amounts. This will be a target of opportunity for future forecast packages this weekend.

AVIATION /00Z TAFS THROUGH 00Z SUNDAY/

Issued at 635 PM EST Fri Feb 13 2026

VFR conditions early this evening dwindle to well below VFR conditions late tonight, potentially even to airport mins late tonight into early Saturday morning as a low-level inversion sets up tonight and melted snow from earlier today will make the boundary layer moist, potentially creating low-level stratus or FG across the terminals. While southerly winds will likely help to keep FG from forming over IWD Saturday morning, wouldn't be surprised to see LIFR cigs via low-stratus still. Went a little 'gung-ho' on FG chances at CMX and SAW tonight/Saturday morning given the large amount of melting we saw today and multiple CAMs highlighting a strong inversion tonight through the morning hours. However, it looks like all will trend back towards VFR by the afternoon hours on Saturday.

MARINE

Issued at 258 PM EST Fri Feb 13 2026

Winds have shifted over to the W and NW behind a cold front that passed through during the early afternoon, coming in below 20 kts in the west but still maintaining 20 kts in the east until tonight when winds fall below 15 kts. Winds remain below 20 kts through the weekend, southerly on Saturday and shifting back to the west and northwest on Sunday. Winds become southerly again on Monday before shifting easterly on Tuesday, with gales possible (50% chance) by Wednesday as storm systems look to move out of the Plains - but exact track and timing remain uncertain.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... Dense Fog Advisory from midnight tonight to 9 AM CST Saturday for MIZ009-010.

Lake Superior... None. Lake Michigan... None.