Great Lakes Forecast
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000
FZUS63 KLOT 180745
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
245 AM CDT Wed Oct 18 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...Expansive high pressure of 30.4 inches will settle over
the eastern Ohio Valley and mid Atlantic Coast through Friday.
A strong low averaging 28.8 inches will take an eastward track
across northern Manitoba today to Hudson Bay on Thursday. The
cold front trailing from this low will move across the lake
Wednesday night into Thursday. Another strong low pressure area
will move across the Canadian Prairies on Friday and Saturday and
to Hudson Bay on Sunday, with its trailing cold front crossing the
lake over the weekend.

LMZ261-362-364-366-563-565-567-669-868-870-181515-
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 Sheboygan to Port Washington WI 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-
245 AM CDT Wed Oct 18 2017

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

...GALE WARNING IN EFFECT FROM 9 AM CDT THIS MORNING THROUGH LATE
TONIGHT...

.TODAY...Southwest winds to 30 kt increasing to gales to 35 kt
by the late morning and then becoming south gales to 45 kt in the
afternoon.. Waves 4 to 7 ft occasionally to 9 ft building to 12
to 16 ft occasionally to 21 ft.
.TONIGHT...Southwest gales to 45 kt becoming west to 30 kt after
midnight...then diminishing to 15 to 25 kt late. Waves 12 to 16 ft
occasionally to 21 ft subsiding to 5 to 8 ft occasionally to 10
ft.
.THURSDAY...West winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt. Waves 3 to 5 ft
subsiding to 1 to 3 ft.
.FRIDAY...South winds to 30 kt. Waves 3 to 5 ft building to 4 to
7 ft occasionally to 9 ft.
.FRIDAY NIGHT...South winds to 30 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.SATURDAY...South winds to 30 kt. Waves 6 to 9 ft occasionally to
12 ft.
.SUNDAY...Southwest winds to 30 kt becoming west 10 to 20 kt in
the afternoon. Showers likely. Waves 5 to 8 ft occasionally to
10 ft subsiding to 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-181515-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
245 AM CDT Wed Oct 18 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.TODAY...Southwest winds to 30 kt becoming south. Occasional
gale force gusts to 35 kt in the afternoon. Waves 4 to 7 ft
occasionally to 9 ft building to 7 to 10 ft occasionally to 13
ft.
.TONIGHT...South winds to 30 kt becoming west 15 to 25 kt.
Occasional gale force gusts to 35 kt in the evening. Waves 7 to 10
ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9
ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 1 to
3 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt becoming south
10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 15 to 25 kt. Waves 3 to 5 ft.
.FRIDAY NIGHT...South winds 15 to 25 kt increasing to 30 kt.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...South winds to 30 kt. Waves 4 to 7 ft occasionally to
9 ft.
.SUNDAY...Southwest winds to 30 kt becoming west 15 to 25 kt.
Chance of showers. Waves 4 to 7 ft occasionally to 9 ft subsiding
to 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-181515-
MAFOR 1809/
MICHIGAN NORTH...Gale Warning in effect...12540 12550 11460 12550
11640. Waves 4 to 7 feet occasionally to 9 feet building to 12 to
16 feet occasionally to 21 feet today. Waves 12 to 16 feet
occasionally to 21 feet subsiding to 6 to 9 feet occasionally to
12 feet tonight.

MICHIGAN SOUTH...Gale Warning in effect...10530 13540 13440 19450
11540 11530. Waves 4 to 7 feet occasionally to 9 feet building to
7 to 10 feet occasionally to 13 feet today. Waves 7 to 10 feet
occasionally to 13 feet subsiding to 6 to 9 feet occasionally to
12 feet tonight.

$$


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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