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 Fri Aug 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 29.5 inches over far eastern Lake
Superior early this morning will slowly move to western Quebec by
late tonight and then to northern Quebec by Saturday night.
Meanwhile, weak high pressure of 29.9 inches will build from the
Missouri River Valley tonight to the southern Great Lakes on
Saturday. This high will build to 30.1 inches by Sunday as it
expands across the eastern third of the United States. A trough of
low pressure averaging 29.9 inches and an associated cold front
will move slowly southeast over Lake Michigan on Monday night and
early Tuesday.

LMZ261-362-364-366-563-565-567-868-181515-
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 Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
245 AM CDT Fri Aug 18 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...West winds to 30 kt becoming northwest late this morning,
then diminishing to 15 to 25 kt early this afternoon. Chance of
showers, mainly this morning. Waves 4 to 7 ft occasionally to 9
ft subsiding to 3 to 6 ft occasionally to 8 ft during the
afternoon.
.TONIGHT...Northwest winds 10 to 20 kt becoming west 10 to 15 kt
late. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt in the afternoon. Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 1 to 3 ft building to 3 to 5 ft.
.SUNDAY NIGHT...South winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 3 to 5 ft.
.MONDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
2 to 4 ft.
.TUESDAY...East winds 10 to 20 kt backing to north 15 to 25 kt.
Chance of showers. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-181515-
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-
245 AM CDT Fri Aug 18 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...West winds to 30 kt diminishing to 10 to 20 kt by mid
afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3
to 6 ft occasionally to 8 ft by late afternoon.
.TONIGHT...West winds 10 to 20 kt becoming northwest 10 to 15 kt
late. Chance of showers and slight chance of thunderstorms late
this evening and overnight. Waves 3 to 5 ft subsiding to 2 to 4
ft.
.SATURDAY...Northwest winds 10 to 15 kt backing to southwest.
Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves building to 2 to 4 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.
.TUESDAY...Southwest winds 10 to 20 kt becoming northwest 15 to
25 kt. Showers likely with a chance of thunderstorms. Waves
building to 3 to 6 ft occasionally to 8 ft.

$$

LMZ761-181515-
MAFOR 1809/
MICHIGAN NORTH 12640 11740 12730 13720. Chance of showers this
morning. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 6
ft occasionally to 8 ft during the afternoon, further subsiding
to 1 to 3 ft by overnight.

MICHIGAN SOUTH 13640 11630 14620. Chance of showers late this
evening and overnight. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 3 to 6 ft occasionally to 8 ft by late afternoon,
further subsiding to 2 to 4 ft by overnight.

$$

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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