Great Lakes Forecast
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340
FZUS63 KLOT 261947
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
247 PM CDT Tue Sep 26 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 trough of low pressure averaging 29.9 inches over
the western Great Lakes will move to southern Ontario this
evening...trailing a cold front across the lake. The low will then
deepen to 29.6 inches as it pulls away into western Quebec by
early Wednesday. High pressure of 30.2 inches will spread slowly
east from the Great Plains Wednesday...with weaker ridging of 30.1
inches extending across southern Lake Michigan by early Thursday.
Low pressure of 29.9 inches will pass just northeast of the Great
Lakes by early Friday...with another cold front pushing across
the lake. High pressure of 30.4 inches will build across the
western and central Lakes Saturday.

LMZ261-362-364-366-563-565-567-868-270330-
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-
247 PM CDT Tue Sep 26 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 10 to 20 kt becoming northwest 15 to
25 kt. Slight chance of showers and thunderstorms this evening.
Waves 2 to 4 ft building to 3 to 5 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY...West winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...Northwest winds 10 to 20 kt becoming north.
Chance of showers. Chance of waterspouts overnight. Waves 1 to
3 ft building to 2 to 4 ft.
.FRIDAY...North winds 15 to 25 kt. Chance of waterspouts in the
morning. Chance of showers in the morning. Waves 4 to 7 ft
occasionally to 9 ft.
.FRIDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.SATURDAY...Southeast winds 5 to 10 kt becoming southwest 10 to
15 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SUNDAY...South winds 15 to 25 kt. Waves 1 to 3 ft building to
2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-270330-
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-
247 PM CDT Tue Sep 26 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds 10 to 15 kt becoming northwest 15 to
25 kt from late evening on. Slight chance of showers this evening.
Waves 1 to 2 ft building to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Chance of showers overnight. Waves 1 to 3 ft building to 2 to
4 ft.
.FRIDAY...North winds 15 to 25 kt increasing to 30 kt. Chance of
waterspouts in the morning. Chance of showers in the morning.
Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft
occasionally to 10 ft.
.FRIDAY NIGHT...Northeast 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.
.SATURDAY...East winds 10 to 15 kt becoming southeast. Waves 2 to
4 ft subsiding to 1 to 3 ft.
.SUNDAY...South winds 10 to 20 kt becoming southeast. Waves 2 to
4 ft.

$$

LMZ761-270330-
MAFOR 2621/
MICHIGAN NORTH 11510 11520 11630 14730 11730. Chance of showers
and thunderstorms early this evening. Waves 2 to 4 feet building
to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4
feet Wednesday.

MICHIGAN SOUTH 11510 11610 14730 12720. Chance of showers early
this evening. Waves 1 to 2 feet building to 4 to 6 feet
occasionally to 8 feet tonight. Waves 4 to 6 feet occasionally to
8 feet Wednesday.

$$


KJB

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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