textproduct: Marquette

KEY MESSAGES

- The warmest airmass of the season so far will impact the UP with highs in the 90s through Tuesday. High dewpoints and poor overnight recoveries will increase cumulative impacts. So, an Extreme Heat Warning has been issued for all of Upper Michigan Monday. People sensitive to heat should make preparations for these conditions.

DISCUSSION

Issued at 401 PM EDT Sun Jul 12 2026

Radar has been very active all day with latest round of convection impacting north-central portions of the forecast area. Large hail has been the main threat throughout the day with golf ball size hail reported earlier and a very strong core currently over northern Marquette County. With the peak heating of the day coming up and abundant moisture in place, do not anticipate these storms weakening any time soon. Daytime highs across the area are already pushing the upper 80s/90 degree mark across the west and where there hasn't been any cloud cover/rainfall so far today. Therefore, the heat advisory remains in place for the western and central portions of the UP through this evening. But, there will be little recovery even tonight with lows only decreasing into the 60s and 70s. With tomorrow being the hottest day of this heat wave, an Extreme Heat Warning has been issued for all of Upper Michigan as heat indices soar into the 105 to 110 degree range. By Tuesday, the extreme heat threat shifts to mainly the southeast. Therefore, the extreme heat warning will likely be continued for Menominee and Delta Counties with future forecast issuances. Meanwhile, the remainder of the forecast area will likely fall under a heat advisory on Tuesday unless future model runs change drastically.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/

Issued at 737 PM EDT Sun Jul 12 2026

VFR conditions will prevail at IWD and SAW through the duration of the 0Z TAF period. A brief period of BR lowering vis to MVFR is anticipated early Monday morning at CMX. West to southwest winds remain elevated around 7 to 14 kts through the period with gusts to around 25 kts at CMX. LLWS is expected to impact SAW late tonight into early Monday morning.

MARINE

Issued at 401 PM EDT Sun Jul 12 2026

Southwesterly winds have increased to 20 to 25 kt across the western half of the lake as the pressure gradient tightens while a strong low moves along the high pressure ridge. Look for winds to increase higher tonight into the 25 to 30 kt range while expanding over the central portions of the lake as well. By Monday night, southwesterly winds will approach gale force before gradually diminishing Tuesday morning and below 20 kts by Tuesday afternoon.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... Heat Advisory until 9 PM EDT /8 PM CDT/ this evening for MIZ001>005-009>011-084.

Extreme Heat Warning from noon EDT /11 AM CDT/ to 10 PM EDT /9 PM CDT/ Monday for MIZ001>007-009>014-084-085.

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