fzus63 kmkx 121359
glflm 
expires:202605122130;;437970

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 2026

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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz364-366-563-565-567-868-122130-
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-
859 am cdt tue may 12 2026

rock island passage to charlevoix mi south to sheboygan wi to
pentwater mi...

...gale warning in effect until 5 pm cdt this afternoon...

.rest of today...south winds 15 to 25 kt increasing to gales to
35 kt. rain showers through mid morning, then chance of rain
showers and slight chance of thunderstorms this afternoon. waves
2 to 4 ft building to 8 to 12 ft occasionally to 16 ft. 
.tonight...southwest winds to 30 kt becoming west 10 to 20 kt
late in the evening, then becoming northwest 15 to 25 kt after
midnight increasing to 30 kt late. chance of rain showers and
slight chance of thunderstorms in the evening, then slight chance
of rain showers overnight. waves 7 to 10 ft occasionally to 13 ft
subsiding to 4 to 7 ft occasionally to 9 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.thursday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.thursday night...south winds 5 to 10 kt increasing to 10 to
20 kt. waves 1 ft or less building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally
to 12 ft. 
.saturday...southwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.  

$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437971

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 2026

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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz669-671-870-872-122130-
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 whitehall to pentwater mi 5 nm offshore to mid
lake-
lake michigan from grand haven to whitehall mi 5 nm offshore to
mid lake-
859 am cdt tue may 12 2026

sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...

...gale warning in effect until 5 pm cdt this afternoon...

.rest of today...south winds 15 to 25 kt increasing to up to 30 
kt. rain showers likely through mid morning, then chance of rain 
showers and thunderstorms this afternoon. waves 1 to 3 ft building
to 8 to 11 ft occasionally to 14 ft. 
.tonight...southwest winds to 30 kt veering to northwest. chance
of rain showers and thunderstorms in the evening. waves 6 to 9 ft
occasionally to 12 ft subsiding to 5 to 8 ft occasionally to
10 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds to 30 kt diminishing to 10 to
20 kt overnight. waves 4 to 7 ft occasionally to 9 ft subsiding
to 2 to 4 ft. 
.thursday...north winds 10 to 20 kt. waves 1 to 3 ft. 
.thursday night...east winds 10 to 15 kt becoming south 10 to
20 kt. waves 1 to 2 ft building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally
to 10 ft. 
.saturday...southwest winds 10 to 20 kt. waves 3 to 5 ft
subsiding to 2 to 4 ft.  

$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437972

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 2026

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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz080-673-675-777-779-874-876-878-122130-
lake michigan from michigan city in to st. joseph mi 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 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-
859 am cdt tue may 12 2026

north point light wi to grand haven mi south...

.rest of today...south winds 15 to 25 kt increasing to up to 30 
kt. chance of rain showers through mid morning, then chance of 
rain showers and thunderstorms this afternoon. waves 1 to 3 ft 
building to 5 to 8 ft occasionally to 10 ft. 
.tonight...southwest winds to 30 kt veering to northwest. chance
of showers and thunderstorms in the evening. waves 5 to 8 ft
occasionally to 10 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds to 30 kt diminishing to 10 to
20 kt overnight. waves 5 to 8 ft occasionally to 10 ft subsiding
to 3 to 5 ft. 
.thursday...north winds 10 to 20 kt. waves 2 to 4 ft subsiding to
1 to 3 ft. 
.thursday night...east winds 10 to 15 kt becoming south. waves
1 to 3 ft. 
.friday...south winds 15 to 25 kt. chance of showers. waves 4 to
6 ft occasionally to 8 ft. 
.saturday...southwest winds 10 to 20 kt becoming south 10 to
15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft.  

$$