textproduct: Marquette

KEY MESSAGES

- Spotty showers linger in the east this morning, then additional showers and storms are possible in the western and central UP this afternoon and evening.

- Scattered showers and isolated thunderstorms will be possible at times into early next week, but severe weather and heavy rainfall are not expected, and it's not likely that any day becomes a washout.

- Temperatures remain below normal this week into early next week.

DISCUSSION

Issued at 225 AM EDT Thu Jun 18 2026

Early this morning, a 994mb surface low is moving through the central Lower Peninsula. Light rain showers continue to pivot into the central UP with wraparound moisture directed into the area. These should exit eastward closer to 12Z as the system pulls away. Expect otherwise quiet conditions the rest of the night as temperatures bottom out in the mid and upper 40s for most.

After a brief break in shower activity this morning into the early afternoon, another shortwave dropping into northern WI will introduce more PoPs to the area, mainly along the state line. With a few hundred j/kg of CAPE, some rumbles of thunder are possible, but severe storms are not expected. Temperatures rise into the mid and upper 60s for most, and possibly the lower 70s over the south- central UP, with more breaks of sunshine into the afternoon. WNW winds become elevated into the afternoon, gusting to near 20mph. Quiet conditions return tonight as winds fall back and showers/storms wrap up. Temperatures fall back into the lower/mid 40s inland, and closer to 50 along the lakeshores. Dry weather persists for most of Friday before showers begin to move into the western UP late in the evening.

Daily rain chances and below normal temperatures persist through the weekend as weak shortwaves rotate through the Upper Great Lakes, though no notable QPF signals exist until early next week. The seemingly endless period of troughing begins to break down early next week into the midweek period, allowing more zonal flow aloft and the passage of additional shortwaves from the northern Rockies to emanate into the region. Chances for more widespread meaningful rainfall (25-50% of >0.25") returns in the Tuesday-Wednesday timeframe.

AVIATION /06Z TAFS THROUGH 06Z FRIDAY/

Issued at 110 AM EDT Thu Jun 18 2026

MVFR cigs and spotty light showers at SAW persist until around daybreak before drier air and diurnal heating help lift them to VFR. There is still a low probability of brief IFR cigs through daybreak as well. Otherwise, VFR conditions are expected to prevail today. A few high-based showers are possible in the afternoon and evening but are not likely to impact flying conditions. West to northwest winds will gust to around 20 kt at times this afternoon.

MARINE

Issued at 225 AM EDT Thu Jun 18 2026

Winds are starting off light early this morning, but modest height rises and weak CAA will allow winds to increase out of the NW after sunrise, with gusts of 20-30 kts across the central and eastern lake. Winds fall between 20-25 kts or less tonight before falling below 20 kts lakewide Friday PM. A period of calmer winds <15 kts is expected through the rest of the weekend and into the coming week.

MQT WATCHES/WARNINGS/ADVISORIES

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