Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 191354
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
854 AM CDT Sun Aug 19 2018

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 stretching from Quebec
to the middle Mississippi Valley will extend from New England to
Newfoundland by Monday morning. Meanwhile, low pressure of 29.8
inches will develop over the central Plains this afternoon and
evening. This low will deepen to 29.6 inches by the time it
reaches Lake Superior Tuesday afternoon. High pressure of 30.3
inches over the northern and central Plains Tuesday will build
east into the middle and upper Mississippi Valley region by
Wednesday night.

LMZ261-362-364-366-563-565-567-868-192115-
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-
854 AM CDT Sun Aug 19 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southeast winds 5 to 10 kt. Waves 1 ft or less.
.TONIGHT...Light and variable winds becoming east 5 to 10 kt
during the evening, then becoming southeast late. Waves 1 to 2
ft.
.MONDAY...Southeast winds 10 to 20 kt becoming east 10 to 15 kt.
Waves 1 to 3 ft.
.MONDAY NIGHT...East winds 10 to 20 kt becoming northeast 15 to
25 kt. Showers likely with a chance of thunderstorms in the
evening, then showers overnight. Waves 2 to 4 ft.
.TUESDAY...North winds to 30 kt increasing to gales to 35 kt.
Showers likely in the morning, then chance of showers in the
afternoon. Waves 6 to 9 ft occasionally to 12 ft.
.TUESDAY NIGHT...North gales to 35 kt diminishing to 30 kt. Waves
6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.THURSDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 2 ft building to 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-192115-
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-
854 AM CDT Sun Aug 19 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Northeast winds 5 to 10 kt becoming east. Waves
1 to 2 ft.
.TONIGHT...East winds 10 to 15 kt becoming southeast 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY...Southeast winds 10 to 20 kt. Chance of showers and
thunderstorms in the afternoon. Waves 2 to 4 ft.
.MONDAY NIGHT...Southeast winds 15 to 25 kt becoming south.
Showers with thunderstorms likely in the evening, then showers
with a chance of thunderstorms overnight. Waves 2 to 4 ft.
.TUESDAY...Northwest winds to 30 kt becoming north gales to
35 kt. Showers likely with a chance of thunderstorms. Waves 5 to
8 ft occasionally to 10 ft building to 7 to 10 ft occasionally to
13 ft.
.TUESDAY NIGHT...North gales to 35 kt diminishing to 30 kt in the
evening. Waves 7 to 10 ft occasionally to 13 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.THURSDAY...West winds 10 to 15 kt becoming southwest. Waves 1 to
2 ft.

$$
LMZ761-192115-
MAFOR 1915/
MICHIGAN NORTH 11300 11500 11300 11200 13310 11320. Waves 1 ft
today. Waves 1 to 2 ft building to 2 to 4 ft by Monday morning.

MICHIGAN SOUTH 12100 11200 12210 13320. Waves 1 to 2 ft today.
Waves 2 to 4 ft tonight and Monday morning.

$$

Experimental modernized open lake forecast is available online at
weather.gov/lot/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes

NOTICE - Starting Wednesday September 5th 2018 this product will
be issued by NWS Milwaukee. For additional information:

https://www.weather.gov/media/notification/pdfs/scn18-64lake_michigan_transfer.pdf
Or Contact: Ed Fenelon at Edward.Fenelon@noaa.gov or Ben Schott
at Ben.Schott@noaa.gov



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