144
FZUS63 KMKX 121402
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
902 AM CDT Wed Mar 12 2025

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.

Waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.SYNOPSIS...

30.1 inch high pressure will linger over Quebec today, helping to
maintain east-northeast winds across Lake Michigan. Said high
will progress into the Saint Lawrence Valley tonight as a weak
area of 29.7 inch low pressure concurrently moves toward the
southern Hudson Bay. Light southeasterly winds will thus become
established over the northern half of the open waters this
evening, with easterly winds persisting further south. A broad
area of 29.2 inch low pressure will migrate into the northern
Rocky Mountains on Thursday, allowing southeasterly breezes to
become established across the entirety of Lake Michigan.

A strong area of low pressure near 28.9 inches will form in the
central Great Plains on Friday, quickly progressing into the upper
Mississippi Valley by dawn Saturday. Gusty southeast winds will
develop ahead of the approaching low by Friday evening, when
widespread gusts between 25-30 knots are expected across all of
the open waters. These gusts will continue into the first half of
Saturday evening as the low pressure center moves from northern
Wisconsin to Ontario. Thunderstorms will accompany the approaching
low late Friday night, with rain showers continuing into Saturday.
Severe weather is not expected at this time. Gusts between 30-35+
knots are possible Saturday morning and afternoon, particularly
over the southern half of Lake Michigan. Trends will be monitored
for potential Gale Watches or Warnings in the coming forecasts.
Winds will shift out of the west- northwest Sunday morning as a
front crosses the open waters. 20-25 knot gusts will continue into
Sunday afternoon, gradually tapering Sunday night.

LMZ261-362-364-366-563-565-567-868-122145-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
902 AM CDT Wed Mar 12 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southeast winds 10 to 20 kt becoming east 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TONIGHT...Northeast winds 10 to 15 kt veering to south. Waves
1 to 2 ft.
.THURSDAY...South winds 5 to 10 kt increasing to 10 to 15 kt,
then becoming southeast late. Waves 1 ft or less.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.FRIDAY...Southeast winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.FRIDAY NIGHT...Southeast winds to 30 kt. Rain showers. Waves
4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally
to 10 ft.
.SATURDAY...Southeast winds to 30 kt becoming south. Rain showers
likely. Waves 7 to 10 ft occasionally to 13 ft building to 8 to
12 ft occasionally to 16 ft.
.SUNDAY...West winds 15 to 25 kt. Chance of rain and snow
showers. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-122145-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
902 AM CDT Wed Mar 12 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...East winds 15 to 25 kt diminishing to 10 to
20 kt early this afternoon, then becoming northeast 10 to 15 kt
late. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.TONIGHT...Northeast winds 5 to 10 kt becoming east. Waves 1 to
3 ft subsiding to 1 ft or less.
.THURSDAY...East winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.THURSDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.FRIDAY...Southeast winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.FRIDAY NIGHT...Southeast winds to 30 kt. Showers. Waves 4 to
7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to
10 ft.
.SATURDAY...South gales to 35 kt. Chance of showers. Waves 8 to
11 ft occasionally to 14 ft building to 8 to 12 ft occasionally to
16 ft.
.SUNDAY...West winds 15 to 25 kt. Chance of rain and snow
showers. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ761-122145-
MAFOR 1216/
MICHIGAN NORTH 11320 11210 11110 11200 11300 13400. Waves 1 to 3
feet this afternoon. Waves 2 feet or less tonight and Thursday
morning.

MICHIGAN SOUTH 11220 11110 12100 14200. Waves 2 to 4 feet
subsiding to 1 to 3 feet this afternoon. Waves 2 feet or less
tonight and Thursday morning.

$$


Quigley

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes