Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 201951
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
251 PM CDT Sun May 20 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 30.2 inches across the northern and
central Great Lakes will remain in place through Monday morning
before weakening. Low pressure of 29.9 inches across the middle
Mississippi Valley tonight will move slowly to southern Michigan
by late Monday night, 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.


LMZ261-362-364-366-563-565-567-868-210330-
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-
251 PM CDT Sun May 20 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds 10 to 20 kt diminishing to 10 to 15 kt
this evening, then becoming variable 5 to 10 kt after midnight.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.MONDAY...Northeast winds 5 to 10 kt. Chance of rain showers.
Patchy fog. Waves 1 to 2 ft.
.MONDAY NIGHT...Variable winds 5 to 10 kt becoming north. Waves 1
to 3 ft.
.TUESDAY...North winds 5 to 10 kt backing to west. Waves 1 to
3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.WEDNESDAY...Southwest winds 10 to 15 kt becoming south. Waves 1
to 3 ft.
.WEDNESDAY NIGHT...South winds 10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves building to 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210330-
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-
251 PM CDT Sun May 20 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds 10 to 20 kt becoming northeast late this
evening, then east late. Chance of showers and thunderstorms
overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.MONDAY...East winds 15 to 20 kt becoming northeast in the
afternoon. Patchy fog. Showers and slight chance of
thunderstorms. Waves 2 to 4 ft building to 3 to 5 ft.
.MONDAY NIGHT...Northeast winds 10 to 20 kt becoming north 10 to
15 kt. Chance of rain showers in the evening. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.TUESDAY...North winds 10 to 15 kt. Waves subsiding to 1 to 3 ft.
.TUESDAY NIGHT...Variable winds 5 to 10 kt. Waves 1 to 2 ft.
.WEDNESDAY...South winds 5 to 10 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 kt. Waves 1 ft or
less.
.THURSDAY...Southeast winds 10 to 15 kt becoming south. Waves
1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.

$$

LMZ761-210330-
MAFOR 2021/
MICHIGAN NORTH 12120 11110 12900 13100. Chance of rain showers
Monday afternoon. Waves 2 to 4 ft subsiding to 1 to 2 ft tonight
and continuing through Monday.

MICHIGAN SOUTH 12820 11120 11110 11220 12226 11120. Chance of
showers and thunderstorms overnight. Waves 3 to 5 ft subsiding to
1 to 3 ft overnight. Waves 2 to 4 ft Monday morning building to 3
to 5 ft Monday afternoon.

$$

MTF

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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