textproduct: Marquette

KEY MESSAGES

- A few lake-breeze driven showers and thunderstorms are possible (15% chance) in the central UP tomorrow. More widespread chances for showers and thunderstorms return for Thursday through Saturday (30- 60% chance).

- Patchy dense fog is possible tonight, mainly near the western UP lakeshores and Keweenaw.

- Seasonably warm temperatures 80s dominate this week.

DISCUSSION

Issued at 128 PM EDT Tue Jul 28 2026

Early afternoon GOES satellite imagery reveals clear skies across da Yoop save for retreating areas of stratus/fog hugging the western lakeshores and floating in the open waters east of the Apostles. Patchy fog may linger overnight but isn't expected to penetrate inland overnight. Temps fall into the 50s tonight under calm winds. Building high pressure will keep largely quiet weather in check for another day, however, lake breeze driven showers and storms may be seen across the central UP's golden triangle tomorrow afternoon/evening where lake breezes off of Lake Superior and Michigan collide. Confidence in this scenario is low given dry air seen in area bufkit soundings, but meager elevated instability and enough forcing from the lake breezes may be enough to kick off some precip. Have added low end PoPs (15% chance) in the afternoon/evening for this possibility. The flattening out of the persistent upper level ridge and reintroduction of zonal flow aloft will allow shortwave activity to translate into the Great Lakes later this week into the coming weekend. PoPs increase Thursday ahead of a shortwave rounding into the Upper Midwest. Additionally, dewpoints in the upper 60s return Thursday, making for a muggy evening with apparent temps pushing the upper 80s to low 90s. A weak cold front then pushes through late Thursday through early Friday, bringing another potential round of showers and thunderstorms into the weekend. While sufficient instability will be present for thunderstorms, bulk shear appears to be lacking to yield severe weather potential at this time. Quieter and warm conditions return for early next week as ridging once again returns to the region.

AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/

Issued at 131 PM EDT Tue Jul 28 2026

VFR conditions will prevail for the duration of the TAF period. Exception will be any fog formation late tonight, but confidence is not high enough to insert mention at this time. Strongest winds remain at SAW at ~10 kts.

MARINE

Issued at 128 PM EDT Tue Jul 28 2026

High pressure ridging building in allows for winds to largely remain below 20 kts lakewide, save for gusts ~20 kts at Whitefish Bay this evening where channeling is expected. This weak surface pattern the rest of the forecast package supports winds remaining below 20 kts until early next week.

Transient marine dense fog remains the primary short term hazard. Dense Fog Advisories have been allowed to carry through this evening in the western half of the lake as satellite imagery reveals fog still hugging the lakeshores of the western UP. Since fog is not actively covering large areas of the open water zones, will let the evening and overnight forecasters assess weather fog headlines need to continue.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... None. Lake Superior... Dense Fog Advisory until 8 PM EDT /7 PM CDT/ this evening for LSZ162-240>244-263-264.

Lake Michigan... None.