Great Lakes Forecast
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415
FZUS63 KLOT 170200
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
900 PM CDT Mon Oct 16 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 over the Ohio
Valley will move to the mid Atlantic Coast Tuesday and Wednesday
where it will remain through Friday. Meanwhile, low pressure of
29.4 inches over northeastern Manitoba this evening will move to
northern Quebec Tuesday night. A second, and much stronger low
averaging 28.8 inches will take a similar track across northern
Manitoba Wednesday 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.

LMZ261-362-364-366-563-565-567-669-868-870-170930-
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-
900 PM CDT Mon Oct 16 2017

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE
WEDNESDAY NIGHT...

.REST OF TONIGHT...Southwest winds to 30 kt. Occasional gale force
gusts to 35 kt late tonight. Waves 4 to 6 ft occasionally to 8 ft
building to 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West winds to 30 kt becoming southwest and diminishing
to 10 to 20 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding
to 4 to 7 ft occasionally to 9 ft.
.TUESDAY NIGHT...Southwest winds 15 to 25 kt increasing to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Southwest winds to 30 kt increasing to gales to 35 kt
by mid day and then becoming south gales to 45 kt in the afternoon.
Waves 7 to 10 ft occasionally to 13 ft building to 10 to 14 ft
occasionally to 18 ft.
.WEDNESDAY NIGHT...Southwest gales to 45 kt becoming west 20 to
25 kt overnight. Waves 12 to 16 ft occasionally to 20 ft
subsiding to 4 to 7 ft occasionally to 9 ft.
.THURSDAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.SATURDAY...South winds to 30 kt. Waves 5 to 8 ft occasionally to
10 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-170930-
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-
900 PM CDT Mon Oct 16 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 20 kt quickly increasing
to 30 kt. Occasional gale force gusts to 35 late. Waves 2 to 4 ft
building to 6 to 9 ft occasionally to 12 ft.
.TUESDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt.
Occasional gale force gusts to 35 kt through mid morning. Waves 7
to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally
to 9 ft late.
.TUESDAY NIGHT...Southwest winds 15 to 25 kt increasing to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Southwest winds to 30 kt becoming south with
occasional gale force gusts to 35 kt in the afternoon. Waves 7 to
10 ft occasionally to 13 ft.
.WEDNESDAY NIGHT...Southwest winds to 30 kt diminishing to 15 to
25 kt and becoming west late. 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...West 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 NIGHT...Southwest winds 5 to 10 kt becoming south 10 to
20 kt overnight. Waves 1 to 2 ft.
.FRIDAY...South winds 15 to 25 kt. Waves 3 to 5 ft.
.SATURDAY...South winds to 30 kt. Waves 4 to 7 ft occasionally to
9 ft.

$$

LMZ761-170930-
MAFOR 1703/
MICHIGAN NORTH 11540 12540 19550 11640 11630 11530 11520 11530.
Waves 4 to 6 feet occasionally to 8 feet building to 7 to 10 feet
occasionally to 13 feet overnight. Waves 7 to 10 feet occasionally
to 13 feet subsiding to 4 to 7 feet occasionally to 9 feet
Tuesday and continuing Tuesday evening.

MICHIGAN SOUTH 10520 12540 12540 19550 12540 12530. Waves 2 to 4
feet building to 6 to 9 feet occasionally to 12 feet overnight.
Waves 7 to 10 feet occasionally to 13 feet Tuesday subsiding to 4
to 7 feet occasionally to 9 feet in the late afternoon and
continuing Tuesday evening.

$$

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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