Great Lakes Forecast
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FZUS63 KLOT 250749
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
249 AM CDT Tue Jul 25 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 30.2 inches across the Great Lakes
will move to New England by late this evening. Meanwhile, low
pressure of 29.5 inches will move eastward across the northern
part of the Canadian prairie provinces today, reaching James Bay
by Wednesday afternoon. A trailing surface trough will slowly move
southward over the northern part of the lake Wednesday evening.
Another low pressure around 29.7 inches will develop along this
trough, just south of Lake Michigan on Wednesday night, and move
eastward to the Mid-Atlantic by Thursday night. High pressure of
30.1 inches will build over the lake by Friday night and hold
through the weekend.


LMZ261-362-364-366-563-565-567-868-251530-
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 25 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southeast winds 5 to 10 kt becoming south 10 to 15 kt
by mid morning, then increasing to 15 to 25 kt this afternoon.
Waves 1 to 3 ft building to 3 to 5 ft by late in the day.
.TONIGHT...South winds 20 to 25 kt increasing to 30 kt by late
evening. Chance of showers and thunderstorms overnight. Waves 3 to
6 ft occasionally to 8 ft building to 4 to 7 ft occasionally to 9
ft.
.WEDNESDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt
in the early afternoon. Showers and thunderstorms likely. Waves 4
to 7 ft occasionally to 9 ft subsiding to 3 to 6 ft occasionally 8
ft in the afternoon.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 kt veering to north
10 to 15 kt overnight. Showers and thunderstorms likely in the
evening, then chance of showers and thunderstorms overnight.
Waves 2 to 4 ft.
.THURSDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Chance of showers in the morning. Waves 3 to 5 ft.
.THURSDAY NIGHT...North winds to 30 kt becoming northeast 15 to
25 kt. Waves 3 to 5 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north. Waves 2 to
4 ft.
.SATURDAY...North winds 5 to 10 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-251530-
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 25 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...East winds 10 to 15 kt veering south shortly after
daybreak and increasing to 10 to 20 kt by late morning. Waves 2
to 4 ft.
.TONIGHT...Southeast winds 10 to 20 kt becoming south by early
overnight. Waves 2 to 4 ft.
.WEDNESDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.WEDNESDAY NIGHT...South winds 10 to 15 kt. Showers and
thunderstorms likely. Waves 1 to 3 ft.
.THURSDAY...East winds 10 to 20 kt becoming north to 30 kt in the
afternoon. Chance of showers and thunderstorms in the morning.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.THURSDAY NIGHT...North winds to 30 kt becoming northeast 20 to
25 kt. Waves 5 to 8 ft occasionally to 10 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 ft subsiding to 2 to 4 ft Friday night.
.SATURDAY...Northeast winds 10 to 15 kt becoming north. Waves
1 to 3 ft.

$$

LMZ761-251530-
MAFOR 2509/
MICHIGAN NORTH 12300 11410 13430 12440. Chance of showers and
thunderstorms overnight. Waves 1 to 3 ft building to 3 to 5 ft by
late in the day, further building to 4 to 7 ft occasionally to 9
ft by late evening.

MICHIGAN SOUTH 11210 11410 13420 12320 11420. Waves 2 to 4 ft.

$$

MTF

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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