textproduct: Marquette

KEY MESSAGES

- Rain showers end later this morning as a low pressure system departs the region.

- Westerly gales of 35-40 kts expected on Lake Superior today in the wake of a passing cold front.

- Mostly dry and cooler weather expected for the remainder of the week.

DISCUSSION

Issued at 333 AM EDT Tue Apr 28 2026

The upper level pattern remains dominated by large scale troughing encompassing much of Canada and the western CONUS this morning, with an embedded negatively tilted shortwave trough lifting through the Upper Great Lakes. At the surface, a 993 mb low is analyzed near Thunder Bay with a cold front extending down through the central U.P. as of 3 AM EDT Tuesday. Radar depicts scattered rain showers ongoing across the area, with the heaviest rain confined to northern Lake Michigan and the eastern U.P. A few rumbles of thunder have been noted from Delta into Schoolcraft County overnight as 500-1000 J/kg MUCAPE per SPC mesoanalysis supports a few elevated thunderstorms. Rain amounts since last evening range from a quarter to three quarter of an inch in the far west and Keweenaw to generally a quarter inch or less over the rest of the U.P., though a few higher amounts are still possible in the east as heavier showers and thunderstorms linger into this morning. Surface observations and webcams also show some patchy fog developing across the area. Will continue to monitor these trends through the morning, but visibilities generally staying above one mile should preclude the need for any headlines.

Rain ends later this morning as the surface low continues to depart into northern Ontario and the cold front clears the eastern U.P. Expect breezy west to northwest winds gusting to 25-35 mph (up to 40 mph in the Keweenaw) on today with CAA, a tight pressure gradient, and a strong isallobaric wind component. Temps will fall back into the mid 40s to mid 50s; near 60 in southern Menominee County.

Once the U.P. is in the wake of the low, surface high pressure will ward off any meaningful precip until late this weekend. Meanwhile, the persistent troughing pattern aloft keeps cooler than normal temps going through the forecast with highs in the 40s to 50s and lows in the 20s to 30s. Fire weather will be the only potential minor concern as daytime humidity values dip into the 30s and perhaps slightly lower in the interior west during the latter half of this week, but generally light winds should help to limit any widespread concerns.

River flooding: No significant changes to river forecasts as the heaviest rainfall over the last 12 hours has occurred outside of the basins experiencing ongoing flooding. River flooding will be mitigated through the rest of the week by mostly dry weather and cooler temps and dewpoints limiting rapid snowmelt.

AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/

Issued at 117 AM EDT Tue Apr 28 2026

LIFR to potentially airport min conditions are or will in short- order be seen over the terminals early this morning as the center of low begins to move into Lake Superior. While some -SHRAs may be seen this morning (highest chances over the western two terminals), once the low passes, expect the winds to turn westerly, bringing an end to the FG seen at SAW at 0500 UTC. While some LIFR to IFR cigs remain throughout much of the morning hours, expect clearing late in the morning into the afternoon hours and rising cigs to progressively bring improvement to VFR from SW to NE over the U.P. today. Expect the winds from the west today to be rather gusty, with some gusts up to 45 mph possible over CMX (up to around a 20% chance).

MARINE

Issued at 333 AM EDT Tue Apr 28 2026

Winds will shift westerly behind the passing cold front this morning as the surface low moves to northern Ontario. This will support another period of 35-40 kt gales today, ending from west to east this evening as the pressure gradient weakens behind the departing system. Significant wave heights of 8 to 14 ft are expected over the east today with 4 to 8 ft over the west. Benign weather is expected for the rest of the week as winds remain below 20 kt under the influence of surface high pressure.

MQT WATCHES/WARNINGS/ADVISORIES

Upper Michigan... None. Lake Superior... Gale Warning until 2 PM EDT /1 PM CDT/ this afternoon for LSZ241>243-263.

Gale Warning until 5 PM EDT this afternoon for LSZ244-245-250- 251-264-265.

Gale Warning from 8 AM this morning to 2 PM EDT this afternoon for LSZ246-247.

Gale Warning from 8 AM this morning to 4 PM EDT this afternoon for LSZ248.

Gale Warning from 11 AM this morning to 4 PM EDT this afternoon for LSZ249.

Gale Warning until 6 PM EDT this evening for LSZ266-267.

Lake Michigan... None.