Marine Weather and Tide Forecast for Grand Haven, MI

DISCUSSION
Issued at 339 AM EDT Mon Jul 14 2025

- Chances for Rain Wed/Thu and next Weekend

Zonal flow with weak sfc ridging brings fair weather through Tuesday then rain chances return for mid-week with the approach of a weak shortwave trough. Showers and storms arrive Wednesday and persist into Thursday as a cold front moves through. The GFS has backed off the severe weather threat, now showing rather weak shear of 20 knots on Wednesday and Thursday. This looks like another pulse thunderstorm environment and only isolated wind gusts as a threat. Storm total QPF is only around 0.15 inches average over the forecast area.

Upper ridging across the SE CONUS late in the week with zonal flow across northern periphery could result in MCS activity making it into Lower Michigan over the weekend but confidence is low at this point with location and timing.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/
Issued at 120 AM EDT Mon Jul 14 2025

VFR conditions will prevail through tonight. Winds will be west to southwest blo 10 knots.

MARINE
Issued at 339 AM EDT Mon Jul 14 2025

Winds and waves will be relatively light through Tuesday with slowly increasing southwest and south flow. Thunderstorms are possible from Wednesday into Thursday and north winds could ramp up behind a cold front later Thursday.

GRR WATCHES/WARNINGS/ADVISORIES
MI...Air Quality Alert until midnight EDT tonight for MIZ037>040- 043>046-050>052-056>059-064>067-071>074.
MARINE...None.