Great Lakes Forecast
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FZUS63 KLOT 231959
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
259 PM CDT Wed Aug 23 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 29.2 inches just east of James Bay
will gradually shift northeast over the next few days while while
slowly filling. High pressure of 30.1 inches over the middle and
upper Mississippi Valley will eventually drift east to the western
Lakes by early Thursday, then will remain in place and strengthen
to 30.2 inches while drifting very slowly east, moving east of
the Great Lakes region on Sunday. A weak surface trough averaging
29.9 inches will approach the western Great Lakes on Sunday and
then move near or south of the lake on Monday.

LMZ261-362-364-366-563-565-567-868-240330-
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-
259 PM CDT Wed Aug 23 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds 10 to 20 kt becoming north. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.THURSDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt becoming northeast 5 to
10 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.FRIDAY...Northeast winds 5 to 10 kt becoming variable. Waves 1
to 2 ft.
.FRIDAY NIGHT...Variable winds 5 to 10 kt becoming east. Waves 1
ft or less.
.SATURDAY...Southeast winds 5 to 10 kt becoming variable. Waves 1
ft or less.
.SATURDAY NIGHT...East winds 5 to 10 kt becoming southeast 10 to
20 kt. Waves 1 to 3 ft.
.SUNDAY...South winds 10 to 20 kt becoming southeast. Waves 2 to
4 ft.
.MONDAY...East winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-240330-
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-
259 PM CDT Wed Aug 23 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds 10 to 20 kt becoming northeast 10 to 15
kt. Chance of waterspouts overnight. Slight chance of showers
overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt. Chance of waterspouts in the morning. Slight chance of
showers. Waves 2 to 4 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt becoming east 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
3 ft.
.FRIDAY NIGHT...Northeast winds 10 to 15 kt becoming east. Waves
1 to 2 ft.
.SATURDAY...Southeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.
.SATURDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.SUNDAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...East winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-240330-
MAFOR 2321/
MICHIGAN NORTH 10720 11820 19830 15820 11820. Waves 3 to 5 feet
subsiding to 2 to 4 feet.

MICHIGAN SOUTH 11820 15110 11820. Waves 3 to 5 feet subsiding to
1 to 3 feet tonight. Waves 2 to 4 feet Thursday.

$$

RC

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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