fzus63 kmkx 181506
glflm 
expires:202512182215;;803090

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
906 am cst thu dec 18 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...

no major changes to the going forecast with this issuance.

low pressure around 29.0 inches over northern minnesota will 
track into lake superior by this afternoon. southerly gales are
expected to continue this morning, and may briefly intensify
(closer to 40 kt) later this morning through around noon cst. a 
brief lull in the gales is possible this afternoon as low 
pressure crosses the upper peninsula of michigan, but then winds 
become westerly and increase back to gale force behind a strong 
cold front this evening, then turn northwesterly tonight and 
remain gales through friday morning. a gale warning is in effect 
for all open waters for these time frames. moderate freezing spray
is expected to accompany the gales late tonight into friday 
morning as a bitterly cold airmass enters the region. 

winds diminish briefly friday as low pressure exits to the west,
but another low pressure system will swing through southern canada
friday night, bringing potential for south-southwest gales once
again. winds will shift to become northwesterly behind the
trailing cold front of this low saturday afternoon, increasing to
near gales once again saturday night before diminishing again into
sunday. winds remain light through sunday night.


lmz261-362-364-366-563-565-567-868-182215-
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-
906 am cst thu dec 18 2025

sheboygan wi to pentwater mi north...

...gale warning in effect through friday morning...

.rest of today...south gales to 40 kt becoming southwest to
30 kt. chance of rain late this morning, then rain and rain
showers this afternoon. waves 10 to 14 ft occasionally to 18 ft. 
.tonight...southwest gales to 35 kt becoming northwest gales to
40 kt. chance of rain and snow showers in the evening, then
chance of snow showers overnight. freezing spray overnight. waves
8 to 11 ft occasionally to 14 ft building to 8 to 12 ft
occasionally to 16 ft. 
.friday...northwest gales to 40 kt diminishing to 15 to 25 kt.
freezing spray in the morning. chance of snow showers in the
morning. waves 10 to 14 ft occasionally to 18 ft subsiding to
4 to 7 ft occasionally to 9 ft. 
.friday night...southwest winds 15 to 25 kt becoming south to
30 kt. chance of snow showers overnight. waves 3 to 5 ft building
to 7 to 10 ft occasionally to 13 ft. 
.saturday...southwest winds to 30 kt becoming west. chance of
snow showers in the morning. waves 8 to 11 ft occasionally to
14 ft subsiding to 6 to 9 ft occasionally to 12 ft. 
.saturday night...west gales to 40 kt. freezing spray. waves 6 to
9 ft occasionally to 12 ft. 
.sunday...northwest winds to 30 kt diminishing to 15 to 25 kt.
freezing spray. waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 6 ft occasionally to 8 ft. 
.monday...southwest winds to 30 kt becoming south. waves 6 to
9 ft occasionally to 12 ft building to 8 to 11 ft occasionally to
14 ft.  

$$

fzus63 kmkx 181506
glflm 
expires:202512182215;;803091

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
906 am cst thu dec 18 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...

no major changes to the going forecast with this issuance.

low pressure around 29.0 inches over northern minnesota will 
track into lake superior by this afternoon. southerly gales are
expected to continue this morning, and may briefly intensify
(closer to 40 kt) later this morning through around noon cst. a 
brief lull in the gales is possible this afternoon as low 
pressure crosses the upper peninsula of michigan, but then winds 
become westerly and increase back to gale force behind a strong 
cold front this evening, then turn northwesterly tonight and 
remain gales through friday morning. a gale warning is in effect 
for all open waters for these time frames. moderate freezing spray
is expected to accompany the gales late tonight into friday 
morning as a bitterly cold airmass enters the region. 

winds diminish briefly friday as low pressure exits to the west,
but another low pressure system will swing through southern canada
friday night, bringing potential for south-southwest gales once
again. winds will shift to become northwesterly behind the
trailing cold front of this low saturday afternoon, increasing to
near gales once again saturday night before diminishing again into
sunday. winds remain light through sunday night.


lmz080-669-671-673-675-777-779-870-872-874-876-878-182215-
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-
906 am cst thu dec 18 2025

sheboygan wi to pentwater mi south...

...gale warning in effect through friday morning...

.rest of today...south gales to 40 kt becoming southwest gales to
35 kt. chance of rain late this morning, then rain and rain
showers this afternoon. waves 10 to 14 ft occasionally to 18 ft. 
.tonight...west gales to 35 kt becoming northwest gales to 40 kt.
chance of snow and rain showers in the evening, then chance of
snow showers overnight. freezing spray overnight. waves 8 to
11 ft occasionally to 14 ft building to 12 to 16 ft occasionally
to 21 ft. 
.friday...northwest gales to 40 kt becoming west 10 to 20 kt.
chance of snow showers in the morning. freezing spray. waves
12 to 16 ft occasionally to 21 ft subsiding to 6 to 9 ft
occasionally to 12 ft. 
.friday night...south winds 15 to 25 kt increasing to 30 kt.
waves 4 to 6 ft occasionally to 8 ft building to 8 to 11 ft
occasionally to 14 ft. 
.saturday...south winds to 30 kt becoming west. chance of snow
showers in the morning. waves 8 to 11 ft occasionally to 14 ft
subsiding to 6 to 9 ft occasionally to 12 ft. 
.saturday night...west winds to 30 kt becoming northwest.
freezing spray. waves 7 to 10 ft occasionally to 13 ft. 
.sunday...northwest winds to 30 kt diminishing to 10 to 20 kt.
freezing spray. waves 6 to 9 ft occasionally to 12 ft subsiding
to 4 to 7 ft occasionally to 9 ft. 
.monday...south winds to 30 kt. waves 6 to 9 ft occasionally to
12 ft building to 8 to 11 ft occasionally to 14 ft.  

$$