Great Lakes Forecast
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442
FZUS63 KLOT 211330
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
830 AM CDT Mon May 21 2018

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...High pressure of 30.3 inches across the Great Lakes
will gradually weakening while shifting to the east today into
tonight. Low pressure of 30.0 inches across the middle Mississippi
Valley will move to southern Michigan by late tonight, and to the
eastern Great Lakes by Tuesday. High pressure of 30.1 inches will
build over the Great Lakes Tuesday night and Wednesday. Late in
the week, low pressure of 29.5 inches will move from the Upper
Midwest into the Great Lakes.

LMZ261-362-364-366-563-565-567-868-212115-
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-
830 AM CDT Mon May 21 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...East winds 5 to 10 kt becoming northeast around
10 kt. Chance of rain showers. Waves 1 to 3 ft.
.TONIGHT...East winds 10 to 15 kt becoming northeast. Chance of
rain showers and slight chance of thunderstorms in the evening,
then slight chance of rain showers overnight. Waves 1 to 3 ft.
.TUESDAY...Northeast winds 5 to 10 kt backing to northwest. Waves
1 to 2 ft.
.TUESDAY NIGHT...West winds 5 to 10 kt becoming southwest. Waves
1 to 2 ft.
.WEDNESDAY...Southwest winds 5 to 10 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-212115-
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-
830 AM CDT Mon May 21 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...East winds 10 to 20 kt. Patchy fog. Rain showers
with a chance of thunderstorms. Waves 2 to 4 ft building to 3 to
5 ft.
.TONIGHT...East winds 10 to 20 kt becoming north 10 to 15 kt.
Chance of rain showers and slight chance of thunderstorms in the
evening, then slight chance of rain showers overnight. Waves
subsiding to 2 to 4 ft.
.TUESDAY...North winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 3 ft.
.TUESDAY NIGHT...Northwest winds 5 to 10 kt. Waves 1 to 2 ft.
.WEDNESDAY...Southwest winds 5 to 10 kt becoming south. Waves
1 ft or less.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 kt. Waves 1 ft or
less.
.THURSDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.

$$
LMZ761-212115-
MAFOR 2115/
MICHIGAN NORTH 11200 12110 12210 11200 12100. Chance of showers
this afternoon. Chance of showers late tonight. Waves 1 to 3 ft.

MICHIGAN SOUTH 12229 11226 12220 11210 11810 11800. Chance of
thunderstorms late this morning. Chance of showers late tonight.
Waves 2 to 4 ft building to 3 to 5 ft this afternoon. Waves
subsiding to 2 to 4 ft tonight and to 1 to 3 ft Tuesday 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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