textproduct: Marquette

KEY MESSAGES

- Patchy fog and/or frost is possible over the interior west late tonight through early Friday morning.

- Seasonable temperatures late this workweek give way to above normal temperatures and humid conditions this weekend through early next week.

DISCUSSION

Issued at 119 PM EDT Thu Aug 27 2026

Early afternoon GOES satellite imagery reveals mostly clear skies across Upper Michigan save for a bubbling cu field in the western interior. Very light radar returns <25 dbz have been observed in the last hour where maybe some sprinkles or very light rain may be reaching the surface, but the majority of CAMs haven't latched onto the idea of any precipitation occuring out that way, so added some 15% PoPs for a very brief shower through the evening. Given ongoing dry air advection, suspecting the area will remain precip free. A few light rain showers may be seen in the Keweenaw this afternoon/evening as showers currently crossing Isle Royale journey southeast across the lake. Otherwise with increasing high pressure and dry air in place, temperatures tonight could be rather chilly especially for the interior. Opting to continue the trend of erring on the lower side of guidance for overnight lows- 50s lakeshores and 40s elsewhere with pockets of upper 30s in the typical cool spots of the interior. Patchy fog and or developing stratus may keep some locations warmer than expected.

Pleasant weather sticks around through Friday under the influence of rising heights aloft and surface high pressure meandering through the Great Lakes. A warmer and more active pattern shapes up this weekend and into the early parts of next week as height rises flatten out to more zonal flow aloft, allowing additional shortwaves to work through the area. Southerly return flow ahead of said shortwaves aims to usher in warmer (5-10 degree above normal daytime highs, 5-15 above normal lows) and more humid airmasses. The next best shot at widespread precip returns this Saturday into Sunday with NBM probability of at least 0.1" pegged between 50-75% for much of the UP. That said, precip amounts will largely depend on thunderstorm coverage. Hopefully we can see enough rainfall in areas now experiencing moderate to extreme drought across the southern and western UP.

AVIATION /18Z TAFS THROUGH 18Z FRIDAY/

Issued at 125 PM EDT Thu Aug 27 2026

VFR conditions continue this afternoon with few/sct cu from 3.5-6kft at IWD and mainly clear skies at SAW/CMX. Main potential aviation impact late tonight to around daybreak Friday is fog, as skies clear, promoting good radiational cooling. Probs of IFR or lower vsby at IWD/SAW are >50% between 07-12Z, and around 20% for LIFR. Probs for IFR or lower vsby at CMX are around 20% so no mention was included in the TAFs at this time. Conditions return to VFR shortly after daybreak on Friday.

MARINE

Issued at 119 PM EDT Thu Aug 27 2026

Lake Superior: NW winds dwindle down to 15 kts or less by this evening as high pressure moves back into the region. Winds look to remain generally 20 kts or less until a shortwave low lifting towards the Upper Midwest brings NE winds of 20 to 25 kts back over the western half of the lake on Sunday into Sunday night. In addition, expect showers and storms to return for the weekend due to incoming shortwave lows. Shortwave activity continues into early next week, keeping the threat for showers and thunderstorms overhead. Some E to NE winds of 20 to 25 kts are possible over the lake on Monday.

Northern Green Bay and northwestern Lake Michigan: NW to N winds lessen to 15 kts or less again for the rest of the work week. Incoming shortwave activity this weekend into early next week looks to bring showers and thunderstorms back across the area throughout much of the rest of the period, with S to SW winds of 15 to 25 kts returning through the weekend. After calming down a bit Sunday night, expect SE to S winds of 15 to 20 kts to return to the area on Monday.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... Beach Hazards Statement until 3 PM EDT this afternoon for MIZ005.

Beach Hazards Statement until 6 PM EDT this evening for MIZ006.

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