Great Lakes Forecast
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000
FZUS63 KLOT 140009 AAA
GLFLM

OPEN LAKE FORECAST for Lake Michigan...UPDATED
National Weather Service Chicago/Romeoville IL
609 PM CST Wed Dec 13 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 southwest Michigan
early this evening...will continue to the mid Atlantic coast
Thursday morning. Weak low pressure of 29.9 inches will develop
over Lake Superior Thursday evening and deepen to 29.6 inches as
it moves just north of Lake Huron Friday evening. High pressure of
30.2 inches will slide across as it crosses Ontario Friday night
and Saturday. The high will merge with another high, forming a
large area of high averaging 30.4 inches that will extend along
the Eastern Seaboard on Sunday.

LMZ261-362-364-366-563-565-567-868-140300-
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-
609 PM CST Wed Dec 13 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds to 30 kt becoming north 15 to 25 kt.
Chance of snow this evening...then slight chance of snow
overnight. Waves 7 to 10 ft occasionally to 13 ft subsiding to 5
to 8 ft occasionally to 10 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west. Slight
chance of snow. Waves 4 to 7 ft occasionally to 9 ft subsiding to
3 to 5 ft.
.THURSDAY NIGHT...West winds 15 to 25 kt. Chance of snow. Waves
3 to 5 ft.
.FRIDAY...West winds to 30 kt becoming northwest. Chance of snow.
Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.FRIDAY NIGHT...Northwest winds to 30 kt diminishing to 15 to
25 kt. Chance of snow in the evening...then chance of flurries
overnight. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
snow and rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.

$$

LMZ669-671-673-675-870-872-874-876-140300-
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 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-
609 PM CST Wed Dec 13 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...

.TONIGHT...Northeast winds to 30 kt becoming north 15 to 25 kt.
Chance of snow. Waves 7 to 10 ft occasionally to 13 ft subsiding
to 5 to 8 ft occasionally to 10 ft.
.THURSDAY...North winds 10 to 20 kt becoming northwest. Chance of
snow in the morning...then slight chance of snow in the
afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to
3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt increasing to 15 to
25 kt. Chance of flurries in the evening...then chance of snow
overnight. Waves 2 to 4 ft building to 4 to 7 ft occasionally to
9 ft.
.FRIDAY...West winds to 30 kt increasing to gales to 35 kt.
Chance of snow in the morning...then chance of flurries in the
afternoon. Waves 7 to 10 ft occasionally to 13 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming northwest. Chance of
snow. Waves 7 to 10 ft occasionally to 13 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Chance of snow in the morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds to 30 kt becoming south 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-777-779-878-140300-
Lake Michigan from Michigan City IN to St. Joseph MI 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 St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
609 PM CST Wed Dec 13 2017

WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...

...GALE WARNING IN EFFECT UNTIL MIDNIGHT CST TONIGHT...

.TONIGHT...Northwest gales to 35 kt becoming north this evening...
then diminishing to 30 kt after midnight and to 15 to 25 kt toward
morning. Chance of snow. Waves 7 to 10 ft occasionally to 13 ft.
.THURSDAY...North winds 10 to 20 kt becoming northwest. Chance of
snow in the morning...then slight chance of snow in the
afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to
3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt increasing to 15 to
25 kt. Chance of flurries in the evening...then chance of snow
overnight. Waves 2 to 4 ft building to 4 to 7 ft occasionally to
9 ft.
.FRIDAY...West winds to 30 kt increasing to gales to 35 kt.
Chance of snow in the morning...then chance of flurries in the
afternoon. Waves 7 to 10 ft occasionally to 13 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming northwest. Chance of
snow. Waves 7 to 10 ft occasionally to 13 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Chance of snow in the morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds to 30 kt becoming south 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$
LMZ761-140300-
MAFOR 1401 AMD/
MICHIGAN NORTH 11140 11840 12830 12720 11620. Chance of snow
this evening. Waves 7 to 10 ft occasionally to 13 ft subsiding
to 5 to 8 ft occasionally to 10 ft tonight. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft Thursday.

MICHIGAN SOUTH...Gale Warning in effect...10750 12850 11840 11830
11820 12720. Chance of snow. Waves 7 to 10 ft occasionally to 13
ft tonight. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3
to 5 ft Thursday.

$$

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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