Great Lakes Forecast
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000
FZUS63 KLOT 201349
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
849 AM CDT Sun Aug 20 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...High pressure of 30.1 inches across the upper Ohio
River Valley will move to the Atlantic seaboard by this evening.
Low pressure of 29.7 inches will develop across the northern Great
Lakes late Monday night into early Tuesday morning, and deepen
quickly to 29.4 inches as it moves to western Quebec by Tuesday
evening. Expansive high pressure of 30.2 inches will build
eastward across the Great Lakes during the latter half of the
week.

LMZ261-362-364-366-563-565-567-868-202130-
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-
849 AM CDT Sun Aug 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 10 to 15 kt becoming south 15 to 25 kt by
mid afternoon. Waves 1 to 3 ft building to 3 to 5 ft by late
afternoon.
.TONIGHT...South winds 15 to 25 kt becoming southwest 10 to
20 kt after midnight. Chance of showers and slight chance of
thunderstorms in the evening...then showers likely with a chance
of thunderstorms overnight. Waves 3 to 6 ft occasionally to 8 ft.
.MONDAY...Southwest winds 10 to 15 kt becoming south. Chance of
showers. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers and thunderstorms in the evening...then showers
and thunderstorms likely overnight. Waves 1 to 3 ft.
.TUESDAY...Northwest winds 15 to 25 kt. Chance of showers and
thunderstorms in the morning. Waves 3 to 6 ft occasionally to 8
ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt. Waves 3 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...North winds 10 to 20 kt. Waves subsiding to 2 to 4
ft.
.THURSDAY...North winds 10 to 15 kt. Waves subsiding to 1 to 3
ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-202130-
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-
849 AM CDT Sun Aug 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 15 kt increasing to 10 to 20 kt early
in the afternoon. Waves 1 to 3 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest after
midnight and diminishing to 10 to 15 kt late. Slight chance of
showers in the evening...then slight chance of showers and
thunderstorms overnight. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 15 kt becoming south in the
afternoon. Chance of showers in the morning. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers and thunderstorms in the evening...then showers
and thunderstorms overnight. Waves 1 to 3 ft building to 2 to
4 ft.
.TUESDAY...West winds 15 to 25 kt becoming northwest 20 to 25 kt.
Showers and thunderstorms likely in the morning...then chance of
showers and thunderstorms in the afternoon. Waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming north. Waves
3 to 6 ft occasionally to 8 ft.
.THURSDAY...Northeast winds 10 to 15 kt. Waves subsiding to 1 to
3 ft.

$$
LMZ761-202130-
MAFOR 2015/
MICHIGAN NORTH 11510 11420 13430 12526 11510. Chance of showers
this evening and a chance of thunderstorms overnight. Waves 1 to 3
ft building to 3 to 5 ft by late afternoon. Waves 3 to 6 ft
occasionally to 8 ft tonight.. Waves 2 to 4 ft Monday morning.

MICHIGAN SOUTH 11410 14420 11420 12510. Chance of showers Monday
morning. Waves 1 to 3 ft.

$$

MDB

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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