Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 181445
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
845 AM CST Sat Nov 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...Low pressure of 29.3 inches over central Illinois
will move to northern Indiana by late this morning...while
deepening to around 29.2 inches. The low will lift into Quebec
Sunday further deepening to 28.8 inches. High pressure of 30.3
inches will build across the central and southern Great Plains
Sunday and shift to the southeastern U.S. by Monday. Low pressure
of 29.2 inches will move from southern Saskatchewan early Monday
to Quebec late Tuesday. Broad high pressure of 30.3 inches will
build across the central and northern Great Plains Wednesday and
shift across the Mississippi Valley Friday.

LMZ261-362-364-366-563-565-567-868-182230-
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-
845 AM CST Sat Nov 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...North winds to 30 kt increasing to gales to
40 kt. Slight chance of drizzle through mid morning...then chance
of rain this afternoon. Waves 6 to 9 ft occasionally to 12 ft
building to 8 to 12 ft occasionally to 16 ft.
.TONIGHT...North gales to 35 kt becoming northwest. Chance of
snow. Waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to 10
ft occasionally to 13 ft.
.SUNDAY...Northwest winds to 30 kt becoming west 15 to 25 kt.
Chance of snow showers. Waves 6 to 9 ft occasionally to 12 ft
subsiding to 3 to 5 ft.
.SUNDAY NIGHT...West winds to 30 kt. Chance of snow showers in
the evening. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
building to 5 to 8 ft occasionally to 10 ft.
.MONDAY NIGHT...Southwest gales to 40 kt. Waves 8 to 12 ft
occasionally to 16 ft.
.TUESDAY...West gales to 35 kt becoming northwest to 30 kt.
Chance of snow. Waves 8 to 11 ft occasionally to 14 ft subsiding
to 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west. Waves 2
to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-182230-
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-
845 AM CST Sat Nov 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...North winds to 30 kt increasing to gales to
45 kt. Rain. Waves 4 to 7 ft occasionally to 9 ft building to
12 to 16 ft occasionally to 21 ft.
.TONIGHT...Northwest gales to 40 kt diminishing to gales to 35
kt. Chance of rain and snow in the evening...then a chance of
snow overnight. Waves 12 to 16 ft occasionally to 21 ft subsiding
to 8 to 12 ft occasionally to 16 ft.
.SUNDAY...Northwest winds to 30 kt becoming west. Waves 8 to 11
ft occasionally to 14 ft subsiding to 4 to 7 ft occasionally to 9
ft.
.SUNDAY NIGHT...West winds to 30 kt. Waves 4 to 7 ft occasionally
to 9 ft.
.MONDAY...Southwest winds to 30 kt increasing to gales to 35 kt.
Waves 6 to 9 ft occasionally to 12 ft.
.MONDAY NIGHT...Southwest gales to 40 kt. Waves 8 to 12 ft
occasionally to 16 ft.
.TUESDAY...West gales to 35 kt becoming northwest to 30 kt. Waves
8 to 11 ft occasionally to 14 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west. Waves 3
to 5 ft.

$$
LMZ761-182230-
MAFOR 1816/
MICHIGAN NORTH...Gale Warning in effect...10840 14850 11850 12750
11740. Chance of rain this afternoon. Chance of snow tonight and
Sunday morning. Waves 6 to 9 feet occasionally to 12 feet building
to 8 to 12 feet occasionally to 16 feet today. Waves 8 to 12 feet
occasionally to 16 feet subsiding to 7 to 10 feet occasionally to
13 feet tonight. Waves 6 to 9 feet occasionally to 12 feet Sunday
morning.

MICHIGAN SOUTH...Gale Warning in effect...10846 11856 12866
14750 11740. Chance of rain and snow this evening. Chance of snow
showers tonight. 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 8 to 12 feet
occasionally to 26 feet tonight. Waves 8 to 11 feet occasionally
to 14 feet Sunday morning.

$$

BMD

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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