Great Lakes Forecast
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000
FZUS63 KLOT 210240
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
840 PM CST Mon Nov 20 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...Low pressure of 29.1 inches north of the Minnesota
Arrowhead will move across Ontario overnight and to northern
Quebec by Tuesday night. An associated cold front will move across
the lake Tuesday morning. Broad high pressure of 30.4 inches will
build across the central Great Plains Tuesday night and gradually
shift to the lower Mississippi Valley through midweek. A trough
of low pressure averaging 29.7 inches will move across Ontario and
the Great Lakes on Thursday.

LMZ261-362-364-366-563-565-567-868-211030-
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-
840 PM CST Mon Nov 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WARNING IN EFFECT THROUGH TUESDAY AFTERNOON...

.REST OF TONIGHT...Southwest gales to 40 kt. Waves 12 to 16 ft
occasionally to 21 ft.
.TUESDAY...West gales to 35 kt becoming northwest by early
afternoon, and diminishing to 30 kt near sunset. Chance of snow
showers in the afternoon. Waves 10 to 14 ft occasionally to 18 ft
subsiding to 6 to 9 ft occasionally to 12 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming southwest.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt increasing to
30 kt. Waves building to 3 to 6 ft occasionally to 8 ft.
.THURSDAY...West winds 15 to 25 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...Northwest winds 10 to 20 kt becoming west.
Waves 2 to 4 ft.
.FRIDAY...Southwest gales to 35 kt increasing to gales to 40 kt.
Chance of rain. Waves building to 7 to 10 ft occasionally to 13
ft.
.SATURDAY...Northwest winds to 30 kt. Chance of snow and rain.
Waves 5 to 8 ft occasionally to 10 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211030-
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-
840 PM CST Mon Nov 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WARNING IN EFFECT THROUGH TUESDAY AFTERNOON...

.REST OF TONIGHT...Southwest gales to 40 kt with a few gusts to 45
kt through early overnight. Waves 12 to 16 ft occasionally to 21
ft.
.TUESDAY...Southwest gales to 35 kt becoming west late in the
morning, then becoming northwest in the early afternoon. Waves 10
to 14 ft occasionally to 18 ft subsiding to 7 to 10 ft
occasionally to 13 ft.
.TUESDAY NIGHT...Northwest winds to 30 kt diminishing to 15 to
25 kt late. A slight chance of snow showers. Waves 6 to 9 ft
occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY...Southwest winds 15 to 25 kt becoming west 10 to
20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft.
.FRIDAY...Southwest winds to 30 kt increasing to gales to 35 kt.
Waves ft building to 6 to 9 ft occasionally to 12 ft.
.SATURDAY...Northwest winds to 30 kt. Waves 6 to 9 ft
occasionally to 12 ft.

$$
LMZ761-211030-
MAFOR 2104/
MICHIGAN NORTH...Gale Warning in effect...13550 12650 11750 12740.
Chance of snow showers in the afternoon. Waves 12 to 16 ft
occasionally to 21 ft tonight, subsiding to 10 to 14 ft
occasionally to 18 ft Tuesday morning, further subsiding to 6 to
9 ft occasionally to 12 ft in the afternoon. Waves subsiding to 5
to 8 ft occasionally to 10 ft Tuesday evening.

MICHIGAN SOUTH...Gale Warning in effect...12550 19560 12550 11650
11750 12740. Waves 12 to 16 ft occasionally to 21 ft tonight
subsiding to 10 to 14 ft occasionally to 18 ft Tuesday morning,
further subsiding to 7 to 10 ft occasionally to 13 ft Tuesday
afternoon. Waves 6 to 9 ft occasionally to 12 ft Tuesday evening.

$$

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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