textproduct: Grand Rapids
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Chances for Rain late Tuesday into Wednesday and again next weekend
DISCUSSION
Issued at 232 PM EDT Sun Sep 6 2026
- Chances for Rain late Tuesday into Wednesday and again next weekend
Fair weather continues through Labor Day into most of Tuesday. There could be some shallow fog late tonight into early Monday morning as light winds and clear skies result in radiational cooling. Lows will drop into the upper 40s and lower 50s by daybreak across much of the forecast area.
An Omega block across the CONUS breaks down early this week as a low across the Pacific NW kicks east and flattens the upper high, with surface low pressure tracking across southern Canada. Return flow of moisture and a surface cold front should kick off some showers and thunderstorms late Tuesday into Wednesday. Shear profiles suggest organized convection is possible if instability is sufficient Tuesday evening ahead of the front.
A zonal flow pattern across the northern CONUS should allow a quick progression of a shortwave trough from the Pacific NW into the upper Great Lakes by next weekend with increasing chances for showers and thunderstorms late Friday into Sunday.
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
Issued at 159 PM EDT Sun Sep 6 2026
Overall VFR conditions with an east to south east wind will continue for the next 24 hours. The only caveat is JXN. Some low CU from out east has brought MVFR over the site this afternoon. That should linger through the day, clearing this evening. Clearing overnight, light winds and cool overnight lows should allow for patchy fog/mist to develop at JXN. Expect MVFR to IFR cigs and vsbys from 09Z until around 13Z. Conditions should then improve to VFR by 15Z at the latest.
MARINE
Issued at 232 PM EDT Sun Sep 6 2026
Light offshore winds, generally less than 15 knots, can be expected through Labor Day under high pressure. Winds will increase on Tuesday as the high moves east A Small Craft Advisory will be needed for Tuesday afternoon through Wednesday night.
GRR WATCHES/WARNINGS/ADVISORIES
MI...None. MARINE...None.
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