Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 180749
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
249 AM CDT Tue Jul 18 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 30.0 inches over the southern Great
Lakes region will slowly move southeast today and tonight. A
weak cold front will move south across the lake late tonight and
Wednesday morning. Another area of weak high pressure will move
across the region Wednesday night and Thursday. Broad low pressure
will develop over the northern and central plains Friday and is
expected to move across the Great Lakes region this weekend.

LMZ261-362-364-366-563-565-567-868-181400-
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-
249 AM CDT Tue Jul 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt becoming southwest 15 to 25 kt.
Slight chance of showers and thunderstorms this afternoon. Waves
1 to 3 ft building to 3 to 5 ft.
.TONIGHT...Southwest winds 15 to 25 kt becoming west 10 to 20 kt
after midnight...then becoming northwest 10 to 15 kt late. Chance
of showers and thunderstorms in the evening...then showers and
thunderstorms likely overnight. Waves 3 to 5 ft subsiding to 2 to
4 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt veering to south.
Waves 1 ft or less.
.THURSDAY...South winds 10 to 15 kt becoming southwest. Chance of
showers and thunderstorms. Waves 1 to 2 ft.
.THURSDAY NIGHT...Southwest winds 5 to 10 kt. Waves 1 ft or less.
.FRIDAY...Southwest winds 5 to 10 kt backing to east 10 to 15 kt.
Chance of thunderstorms. Waves 1 to 2 ft.
.SATURDAY...East winds 10 to 15 kt becoming southeast. Chance of
showers and thunderstorms. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-181400-
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-
249 AM CDT Tue Jul 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 15 kt increasing to 15 to 25 kt this
afternoon. Waves 1 to 2 ft building to 2 to 4 ft.
.TONIGHT...South winds 15 to 25 kt becoming west 10 to 20 kt.
Slight chance of showers and thunderstorms in the evening...
then chance of showers and thunderstorms overnight. Waves 2 to
4 ft.
.WEDNESDAY...West winds 10 to 15 kt becoming north. Chance of
showers and thunderstorms in the morning. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...North winds 10 to 15 kt veering to east.
Chance of showers and thunderstorms overnight. Waves 1 to 3 ft.
.THURSDAY...South winds 10 to 20 kt becoming southwest 10 to 15
kt. Showers and thunderstorms likely in the morning...then chance
of showers and thunderstorms in the afternoon. Waves 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt becoming south 10
to 20 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 15 kt. Chance of showers and
thunderstorms. Waves 1 to 2 ft.
.SATURDAY...Southeast winds 10 to 15 kt becoming south. Chance
of showers and thunderstorms. Waves 1 to 2 ft.

$$

LMZ761-181400-
MAFOR 1809/
MICHIGAN NORTH 12420 14530 11520 11629. Chance of showers and
thunderstorms in the evening. Waves 1 to 3 ft building to 3 to
5 ft today...subsiding to 2 to 4 ft tonight.

MICHIGAN SOUTH 12410 11420 13430 11530 11520. Chance of showers
and thunderstorms overnight. Waves 1 to 2 ft building to 2 to 4
ft today.

$$

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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