Great Lakes Forecast
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FZUS63 KLOT 121429
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
829 AM CST Tue Dec 12 2017

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 29.4 inches over New York this
morning will shift eastward to Maine tonight. High pressure of
29.9 inches will quickly pass over the Western Lakes Wednesday,
and a 29.4 inch low will pass over the southern end of the lake or
just south of the lake Wednesday evening. A low averaging 29.9
inches will form over Lake Superior Thursday evening and deepen to
around 29.7 inches over the Eastern Great Lakes Friday evening.

LMZ261-362-364-366-563-565-567-868-122215-
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-
829 AM CST Tue Dec 12 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WARNING IN EFFECT UNTIL 6 PM CST THIS EVENING...

.REST OF TODAY...North gales to 40 kt diminishing to gales to 35
kt. Freezing spray. Chance of snow showers. Waves 10 to 14 ft
occasionally to 18 ft subsiding to 8 to 11 ft occasionally to 14
ft.
.TONIGHT...Northwest winds to 30 kt diminishing to 10 to 15 kt.
Slight chance of snow showers in the evening...then chance of snow
showers overnight. Waves subsiding to 3 to 5 ft.
.WEDNESDAY...North winds 5 to 10 kt veering to east 10 to 20 kt
late in the morning...then increasing to 15 to 25 kt early in the
afternoon and becoming northeast late. Snow likely in the
morning... then chance of snow in the afternoon. Waves 2 to 4 ft
building to 3 to 5 ft.
.WEDNESDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of snow in the evening. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt. Chance of snow. Waves
2 to 4 ft.
.FRIDAY...Northwest winds 15 to 25 kt. Chance of snow. Waves 3 to
5 ft.
.SATURDAY...West winds 10 to 20 kt becoming southwest. Chance of
snow. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-122215-
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-
829 AM CST Tue Dec 12 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WARNING IN EFFECT UNTIL 8 PM CST THIS EVENING...

.REST OF TODAY...Northwest gales to 40 kt diminishing to gales to
35 kt. Freezing spray. Snow showers. Waves 12 to 16 ft
occasionally to 21 ft.
.TONIGHT...Northwest winds to 30 kt becoming west 10 to 20 kt
late. Snow showers in the evening...then slight chance of snow
showers overnight. Waves subsiding to 4 to 6 ft occasionally to
8 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt backing to east 15 to
25 kt. Snow. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 kt becoming north.
Snow likely in the evening...then chance of snow overnight. Waves
4 to 6 ft occasionally to 8 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt. Chance of snow. Waves
2 to 4 ft.
.FRIDAY...West winds to 30 kt becoming northwest. Chance of snow.
Waves 4 to 6 ft occasionally to 8 ft building to 4 to 7 ft
occasionally to 9 ft.
.SATURDAY...West winds 15 to 25 kt becoming southwest. Chance of
snow. Waves 3 to 5 ft.

$$
LMZ761-122215-
MAFOR 1216/
MICHIGAN NORTH...Gale Warning in effect...13850 11740 11730 11720
11817 11117. Chance of snow showers today and tonight. Waves 10
to 14 feet occasionally to 18 feet subsiding to 8 to 11 feet
occasionally to 14 feet today. Waves subsiding to 3 to 5 feet
tonight...and to 2 to 4 feet Wednesday morning.

MICHIGAN SOUTH...Gale Warning in effect...13757 11747 12737 11627
11527. Waves 12 to 16 feet occasionally to 21 feet today. Waves
subsiding to 4 to 6 feet occasionally to 8 feet tonight and
Wednesday morning.

$$


KJB

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

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



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