Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 140800
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
300 AM CDT Mon Aug 14 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 Great Lakes
will spread eastward to New England today. Meanwhile, weak low
pressure of 29.7 inches over eastern South Dakota will move to the
upper Misssissippi Valley today and to the central Lakes on
Tuesday, with a trailing cold front moving across the lake.
Another low averaging 29.6 inches will develop over eastern
Colorado Tuesday and track toward the western Lakes by Thursday
morning. This low pressure area will then move east later Thursday
through Thursday night, with the trailing cold front sweeping
across the lake.

LMZ261-362-364-366-563-565-141530-
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-
300 AM CDT Mon Aug 14 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.TODAY...South winds 10 to 15 kt diminishing to 5 to 10 kt.
Slight chance of showers and thunderstorms this afternoon. Waves 1
ft or less.
.TONIGHT...South winds 5 to 10 kt becoming east late in the
evening...then becoming northeast 10 to 15 kt after midnight.
Chance of showers and slight chance of thunderstorms in the
evening...then slight chance of showers overnight. Waves 1 ft or
less.
.TUESDAY...Northeast winds 10 to 20 kt becoming north. Waves 1 to
3 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming east 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.WEDNESDAY NIGHT...East winds 10 to 20 kt becoming southeast to
30 kt overnight. Chance of showers and thunderstorms. Waves 2 to
4 ft building to 3 to 5 ft.
.THURSDAY...Southeast winds 15 to 25 kt becoming southwest 10 to
20 kt. Chance of showers and thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.FRIDAY...Northwest winds 15 to 25 kt becoming north 10 to 20 kt.
Waves 3 to 5 ft.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-141530-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 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 Pentwater to Manistee MI 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-
300 AM CDT Mon Aug 14 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TODAY...Southeast winds 5 to 10 kt becoming southeast. Waves 1
ft or less.
.TONIGHT...Southeast winds 10 to 15 kt veering to west toward
daybreak. Chance of showers and thunderstorms in the
evening...then chance of showers and slight chance of
thunderstorms overnight. Waves 1 to 2 ft.
.TUESDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TUESDAY NIGHT...Northeast winds 10 to 20 kt becoming east 10 to
15 kt. Waves 2 to 4 ft.
.WEDNESDAY...Southeast winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of showers and thunderstorms in the afternoon.
Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 kt becoming south
15 to 25 kt. Showers likely with a chance of thunderstorms. Waves
1 to 3 ft building to 3 to 5 ft.
.THURSDAY...South winds 15 to 25 kt becoming west 10 to 20 kt.
Chance of showers and thunderstorms. Waves 3 to 5 ft.
.FRIDAY...Northwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft.

$$

LMZ761-141530-
MAFOR 1409/
MICHIGAN NORTH 14410 11400 19500 12400 11200 11110. Chance of
showers this evening. Waves 1 foot or less.

MICHIGAN SOUTH 12300 11300 19500 11310 19500 13310 11410 19510.
Chance of showers and thunderstorms this evening. Waves 2 feet or
less.

$$

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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