textproduct: Marquette

KEY MESSAGES

- Areas of dense fog are possible through later this morning, especially along and near east-central Lake Superior.

- Dry and mostly sunny weather continues today with above normal temperatures.

- Temperatures trend hotter into the coming week, with widespread 90s possible mid to late week.

- Another round of showers and storms likely on Monday. Diurnally- driven showers and storms will be possible the remainder of the week (15-30% chance each day).

DISCUSSION

Issued at 335 AM EDT Sun Jun 7 2026

Early morning RAP analysis depicts upper level ridging centered just west of the Great Lakes over the Upper MS River Valley, with surface high pressure analyzed over eastern Lake Superior. GOES Nighttime Microphysics composite satellite imagery reveals mostly clear skies across Upper Michigan as of 3 AM EDT Sunday, with fog thus far confined mainly to Luce and Chippewa Counties as well as adjacent areas along the shoreline east of Munising. There is still reason to anticipate further expansion of fog and stratus through the morning hours based on recent satellite trends and dewpoint depressions generally only running 1-2 degrees at best per latest surface observations from around the UP. For that reason, would expect the current southwestward progression of the fog bank over the eastern UP to continue through daybreak, with some recent fog development also being noted over northern Wisconsin. The prevalence (or not) of fog and stratus could once again make for a tricky temperature forecast this afternoon as onshore flow threatens to hold areas along the immediate Superior shoreline (including Marquette) down in the 60s while inland locations once again warm into the upper 70s to mid 80s under sunny skies as the axis of the upper level ridge shifts directly overhead this afternoon. Stay tuned for some possible temperature adjustments later this morning depending on the evolution of the fog and stratus concerns through and after daybreak. Regardless, would expect a pleasant afternoon across the UP as any fog and stratus eventually breaks up with daytime heating and gives way to sunny skies.

Precipitation chances return early this coming week as a shortwave is lifted from the southern Plains into the Great Lakes amidst increasing height falls across the western CONUS. Ample moisture return from the Gulf in the form of PWATs climbing into the 90-99th climatological percentile will pose a heavy rain risk, although given the lack of rain received in the last month, most would welcome an additional soaking rain event. In addition to the increased moisture, warm temperatures, possibly the warmest experienced so far this early Summer, are expected into the midweek. The latest NBM suggests a high chance (60-90%) of surface temps exceeding 90F across the interior west and central Wednesday/Thursday. However, these temperatures may be inflated by the ensembles bias correction, which was been warmer than observed recently. Non-bias corrected ensembles such as the LREF, comprised of other global ensembles, suggests a low <30% chance for sfc temps reaching 90F this far north. Trends will continued to be monitored over the coming days. In addition, cloud cover and precip development may hinder peak temperatures from reaching the 90s. Trends in severe weather potential will be monitored as well as a sharp shortwave lifting through the Plains and Upper Midwest will lead to thunderstorm development Wednesday afternoon and evening. At this time, SPC highlights and severe weather risk across MN and northwest WI, including the far western arm of Lake Superior.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 742 AM EDT Sun Jun 7 2026

Satellite imagery shows patchy low stratus and fog impacting parts of Upper Michigan as of 12z Sun, particularly along the Lake Superior shoreline. This is producing LIFR conditions at KCMX and is also encroaching upon KSAW, where conditions appear likely to deteriorate within the next hour or so. A patch of low stratus producing IFR cigs around FL007 is also located east of KIWD but appears to be showing signs of eroding. Expect stratus and fog to dissipate at all terminals by around 15-16z Sun, with VFR conditions prevailing for the remainder of the period. Winds will increase to around 10 kt out of the ESE today ahead of the next approaching system Monday morning. Expect any precipitation associated with this system to hold off at KIWD until after 12z Mon.

MARINE

Issued at 335 AM EDT Sun Jun 7 2026

Dense Fog Advisory remains in effect for most of Lake Superior through 11 AM EDT this morning as satellite and available webcam imagery continue to indicate at least patchy dense fog over the waters. Will continue to monitor trends for any possible extensions later today. Otherwise, winds are expected to remain below 25 kts through the forecast period. Active weather returns Monday/Tuesday with increasing chances for showers and a few thunderstorms, which may create localized gusty winds. Looking further ahead, stronger thunderstorms may pose a hazard to mariners and recreationists alike on Wednesday. The latest SPC convective outlook highlights the western arm of Lake Superior for potential severe thunderstorms capable of producing strong winds and large hail. While the details are murky at this time, continue to monitor the forecast for ongoing trends and updates.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... None. Lake Superior... Dense Fog Advisory until 11 AM EDT /10 AM CDT/ this morning for LSZ162-244>251-263>267.

Lake Michigan... Dense Fog Advisory until 10 AM EDT this morning for LMZ250.