Great Lakes Forecast
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000
FZUS63 KLOT 211954
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
254 PM CDT Mon Aug 21 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...A weak stationary front was just north of the lake
this afternoon. Low pressure of 29.7 inches will develop along
this front tonight and will move northeast into southwestern
Ontario Tuesday morning, deepening to 29.4 inches and continuing
into Quebec by afternoon while the front pushes south down the
lake. The low will deepen further to 29.2 inches Tuesday night
while high pressure of 30.1 inches spreads southeast across the
Plains. The high 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 into Saturday.

LMZ261-362-364-366-563-565-567-868-220330-
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-
254 PM CDT Mon Aug 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 20 kt becoming west 15 to 25 kt.
Chance of showers and thunderstorms this evening...then showers
and thunderstorms overnight. Waves 1 to 3 ft building to 3 to 5
ft.
.TUESDAY...Northwest winds 15 to 25 kt. Chance of showers and
slight chance of thunderstorms in the morning. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt. Waves 3 to 5 ft.
.WEDNESDAY...Northwest winds 15 to 20 kt. Waves 3 to 5 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.THURSDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 1 to 2 ft.
.FRIDAY...Northeast winds 5 to 10 kt. Waves 1 ft or less.
.SATURDAY...East winds 5 to 10 kt. Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220330-
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-
254 PM CDT Mon Aug 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southeast winds 10 to 15 kt becoming southwest 15 to
25 kt. Chance of showers and thunderstorms this evening...then
showers and thunderstorms likely overnight. Waves 1 to 3 ft
building to 4 to 6 ft occasionally to 8 ft.
.TUESDAY...West winds to 30 kt becoming northwest 15 to 25 kt.
Chance of thunderstorms and slight chance of showers in the
morning. Waves 5 to 8 ft occasionally to 10 ft.
.TUESDAY NIGHT...Northwest winds 15 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...Northwest winds 15 to 20 kt becoming north. Waves 3
to 5 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming northeast
10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...Northeast winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast 5 to 10 kt.
Waves 1 to 2 ft.
.SATURDAY...Southeast winds 10 to 15 kt becoming east 5 to 10 kt.
Waves 1 ft or less.

$$

LMZ761-220330-
MAFOR 2121/
MICHIGAN NORTH 12410 11429 11529 11639 13730. Chance of showers
and thunderstorms early this evening. Chance of showers late
Tuesday. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves
4 to 7 feet occasionally to 9 feet Tuesday.

MICHIGAN SOUTH 12410 12520 11539 11630 12730. Chance of showers
and thunderstorms early this evening. Chance of showers and
thunderstorms late Tuesday. Waves 1 to 3 feet building to 4 to 6
feet occasionally to 8 ft tonight and to 5 to 8 feet occasionally
to 10 feet Tuesday.

$$


Ratzer

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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