textproduct: Marquette

KEY MESSAGES

- Dry, sunny, and pleasant weather returns today as temperatures run cooler than in previous days.

- Temperatures stay near normal this weekend through next week with rain showers and storms returning from time to time.

DISCUSSION

Issued at 252 AM EDT Sat Aug 8 2026

Ridging persists over the western CONUS, extending from midlevel high pressure centered over the Four Corners. Meanwhile, midlevel low pressure continues to spin over central Canada. We remain on the back side of an exiting shortwave, but increasingly this weekend, flow aloft becomes more zonal which leaves us vulnerable to passing shortwaves. In the meantime, behind the exiting cold front, skies continue to clear from west to east across the UP. Temperatures so far have only fallen into the lower 60s in the western UP and the upper 60s under cloudy skies in the east. Expect temperatures to range in the lower to mid 50s in the western UP, and the upper 50s to lower 60s in the east by the early morning hours. Surface ridging into the Great Lakes today will allow for a sunny and pleasant day, with temperatures coming in cooler than yesterday; expect highs in the 70s for most, and closer to 80 in the south-central UP. NW winds may turn breezy again, though not as much as on Friday, with gusts up to 15-20mph for the daytime hours.

Sunday brings back chances for showers and storms as another cold front moves through. Modest instability and plenty of bulk shear could support stronger storms, however better instability and forcing for severe storms remains south of the CWA. NBM probabilities of exceeding 0.25 inches of rainfall are between 10- 40%, highest over the west half of the UP. Otherwise quasi zonal flow over the Upper Great Lakes leads to pleasant summer temps in the 70s the remainder of the forecast period with lows in the upper 40s to 50s. Chances for showers and storms dot the extended forecast as transient shortwaves traverse the area.

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/

Issued at 712 AM EDT Sat Aug 8 2026

VFR prevails through the forecast period with mostly clear skies during the daytime hours followed by increasing midlevel cloud cover tonight. Some rain showers may reach CMX early Sunday morning. Otherwise, shifting winds will make up the aviation impacts this period as winds become northwesterly today before shifting back to the south to southwest tonight, generally between 5-10 kt.

MARINE

Issued at 252 AM EDT Sat Aug 8 2026

Winds across Lake Superior are turning over to the west, coming in below 20kts early this morning. Meanwhile, satellite imagery indicates a potential for patchy fog across the eastern half of the lake, which should lift after sunrise. As winds shift over to the SW this afternoon, channeling near Granite island and Isle Royale will yield some gusts to around 20-25 kts. Winds fall back below 20kts across the lake tonight, then are expected to stay at our below 10kts at least into early next week.

Over northern Lake Michigan and the northern half of Green Bay, winds shifting over to the W and then NW come in below 20kts today through tonight, but then gusts increase to around 15-20kts out of the south Sunday. Expect winds to quickly fall back again Sunday evening, then remain at or below 10kts through at least early next week.

MQT WATCHES/WARNINGS/ADVISORIES

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