Marine Weather Statement
Issued by NWS Grand Rapids, MI

479
FZUS73 KGRR 100731
MWSGRR

Marine Weather Statement
National Weather Service Grand Rapids MI
331 AM EDT Sun Aug 10 2025

LMZ845-876-878-100740-
/O.CAN.KGRR.MA.W.0030.000000T0000Z-250810T0800Z/
331 AM EDT Sun Aug 10 2025

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...
  Nearshore Waters from South Haven to Holland MI...
  Open Waters from St Joseph to Holland MI...

The thunderstorms have moved out of the warned area
and no longer pose a significant threat to boaters.

LAT...LON 4328 8637 4303 8623 4277 8624 4277 8705
      4278 8705 4325 8713
TIME...MOT...LOC 0730Z 237DEG 29KT 4329 8648 4316 8635 4298 8646

$$

LMZ846-847-872-874-100800-
/O.CON.KGRR.MA.W.0030.000000T0000Z-250810T0800Z/
331 AM EDT Sun Aug 10 2025

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 400 AM EDT...

For the following areas...
  Nearshore and Open Waters from Holland to Whitehall MI...

At 330 AM EDT, strong thunderstorms capable of producing waterspouts
were located along a line extending from near The White Lake
Pierheads to near Mona Lake Channel to 10 nm southwest of Grand Haven
Light, moving northeast at 30 knots.

HAZARD...Waterspouts and wind gusts to nearly 50 knots.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally
         hazardous seas. Small craft could be damaged in briefly
         higher winds and suddenly higher waves.

Locations impacted include...
Grand Haven Light and Muskegon Light.

LAT...LON 4328 8637 4303 8623 4277 8624 4277 8705
      4278 8705 4325 8713
TIME...MOT...LOC 0730Z 237DEG 29KT 4329 8648 4316 8635 4298 8646

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...49KTS

$$

JC