fzus63 kmkx 150902
glflm 
expires:202512151700;;615419

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
302 am cst mon dec 15 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...

strong high pressure of 30.7 inches over the ohio river valley
early this morning will slowly progress southeastward through the
first half of this week, gradually weakening and merging into the
atlantic ocean. with the proximity and strength of the high
pressure system this morning, southwesterly winds with gusts to
gale force are expected, and a gale warning remains in effect
through noon cst today for all open waters. these should be 
relatively weak (35 kt) gales at best. moderate freezing spray is
expected through this morning as well. winds veer due west and 
decelerate in a north to south manner this afternoon into tonight.

strong low pressure around 29.0 inches tracks eastward across
ontario canada on tuesday, working with the aforementioned high
pressure system to drive breezy southwesterly winds. a gale watch
is in effect for the northern third of the open waters tuesday 
afternoon through late tuesday night, where roughly 40 kt gales
are expected. winds are forecast to hold just shy of gale force
for the rest of the lake, though we will continue to monitor. a 
cold front extending south of the low crosses the lake late 
tuesday night, veering winds due west. winds and gusts subside 
behind the front.

another strong low pressure system is expected to track eastward 
along the usa / canada borderline mid week, likely crossing lake 
superior thursday and continuing east. strong south winds are 
expected across lake michigan wednesday night (gales likely over 
most of the lake), with the associated cold front crossing the 
lake late thursday morning. even stronger west to northwesterly 
gales are likely behind the front thursday afternoon into 
thursday night.

a brief lull in the winds is likely mid friday. a clipper system 
crossing southern canada may lead to a period of gusty southerly 
winds late friday into friday night. 


lmz366-565-567-868-151700-
lake michigan from point betsie to manistee mi 5 nm offshore to
mid lake-
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-
302 am cst mon dec 15 2025

sturgeon bay wi to point betsie mi south to sheboygan wi to
pentwater mi...

...gale warning in effect until noon cst today...

.today...southwest gales to 35 kt diminishing to 30 kt late this
morning, then becoming west 15 to 25 kt early this afternoon
diminishing to 10 to 20 kt late. moderate freezing spray this 
morning. slight chance of snow this morning. waves 8 to 11 ft 
occasionally to 14 ft subsiding to 5 to 8 ft occasionally to 10 
ft. 
.tonight...west winds 10 to 15 kt becoming southwest. waves 4 to
6 ft occasionally to 8 ft subsiding to 1 to 3 ft. 
.tuesday...southwest winds 15 to 25 kt increasing to 30 kt. a few
gusts to gale force possible. waves 3 to 5 ft building to 10 to 
14 ft occasionally to 18 ft.
.tuesday night...southwest winds to 30 kt becoming west. waves 10
to 14 ft occasionally to 18 ft subsiding to 8 to 12 ft 
occasionally to 16 ft. 
.wednesday...west winds 10 to 20 kt becoming southwest. waves
5 to 8 ft occasionally to 10 ft subsiding to 2 to 4 ft. 
.wednesday night...south gales to 40 kt increasing to gales to
45 kt. chance of rain. waves 8 to 12 ft occasionally to 16 ft
building to 14 to 18 ft occasionally to 23 ft. 
.thursday...southwest gales to 40 kt becoming west gales to
45 kt. rain with a chance of snow. waves 14 to 18 ft occasionally
to 23 ft. 
.friday...northwest winds 10 to 20 kt backing to southwest to
30 kt. waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to
7 ft occasionally to 9 ft.  

$$

fzus63 kmkx 150902
glflm 
expires:202512151700;;615420

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
302 am cst mon dec 15 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...

strong high pressure of 30.7 inches over the ohio river valley
early this morning will slowly progress southeastward through the
first half of this week, gradually weakening and merging into the
atlantic ocean. with the proximity and strength of the high
pressure system this morning, southwesterly winds with gusts to
gale force are expected, and a gale warning remains in effect
through noon cst today for all open waters. these should be 
relatively weak (35 kt) gales at best. moderate freezing spray is
expected through this morning as well. winds veer due west and 
decelerate in a north to south manner this afternoon into tonight.

strong low pressure around 29.0 inches tracks eastward across
ontario canada on tuesday, working with the aforementioned high
pressure system to drive breezy southwesterly winds. a gale watch
is in effect for the northern third of the open waters tuesday 
afternoon through late tuesday night, where roughly 40 kt gales
are expected. winds are forecast to hold just shy of gale force
for the rest of the lake, though we will continue to monitor. a 
cold front extending south of the low crosses the lake late 
tuesday night, veering winds due west. winds and gusts subside 
behind the front.

another strong low pressure system is expected to track eastward 
along the usa / canada borderline mid week, likely crossing lake 
superior thursday and continuing east. strong south winds are 
expected across lake michigan wednesday night (gales likely over 
most of the lake), with the associated cold front crossing the 
lake late thursday morning. even stronger west to northwesterly 
gales are likely behind the front thursday afternoon into 
thursday night.

a brief lull in the winds is likely mid friday. a clipper system 
crossing southern canada may lead to a period of gusty southerly 
winds late friday into friday night. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-151700-
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-
302 am cst mon dec 15 2025

sheboygan wi to pentwater mi south...

...gale warning in effect until noon cst today...

.today...southwest gales to 35 kt becoming west 15 to 25 kt.
moderate freezing spray this morning. waves 8 to 12 ft 
occasionally to 16 ft subsiding to 7 to 10 ft occasionally to 13 
ft. 
.tonight...west winds 10 to 20 kt becoming southwest 10 to 15 kt.
waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft. 
.tuesday...southwest winds 10 to 20 kt increasing to 30 kt. a few
gusts to gale force possible in the afternoon. waves 3 to 5 ft 
building to 10 to 14 ft occasionally to 18 ft.
.tuesday night...southwest winds to 30 kt becoming west. a few
gusts to gale force possible. waves 10 to 14 ft occasionally to 
18 ft.
.wednesday...west winds 15 to 25 kt becoming southwest 10 to
20 kt. waves 6 to 9 ft occasionally to 12 ft subsiding to 3 to
5 ft. 
.wednesday night...south gales to 40 kt. chance of rain. waves
8 to 12 ft occasionally to 16 ft building to 12 to 16 ft
occasionally to 21 ft. 
.thursday...southwest gales to 40 kt becoming west gales to
45 kt. rain with a chance of snow. waves 14 to 18 ft occasionally
to 23 ft. 
.friday...northwest winds 15 to 25 kt becoming southwest to
30 kt. waves 8 to 12 ft occasionally to 16 ft subsiding to 4 to
7 ft occasionally to 9 ft.  

$$