Great Lakes Forecast
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000
FZUS63 KLOT 220133
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
833 PM CDT Sat Oct 21 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...High pressure of 30.4 inches over the mid Atlantic
Coast will shift slowly east into Sunday. Low pressure of 29.3
inches over Manitoba will lift to Hudson Bay Sunday as a trailing
cold front moves across Lake Michigan during the afternoon.
Another low of 29.4 inches will move across Alberta Sunday to
James Bay late Monday. An associated cold front will move across
Lake Michigan Monday night. Low pressure of 29.6 inches will form
over the upper Ohio Valley Monday night and lift into eastern
Ontario Tuesday, deepening to 29.0 inches as it does so.

LMZ261-362-364-366-563-565-567-868-221000-
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-
833 PM CDT Sat Oct 21 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds to 30 kt. Slight chance of showers
overnight. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...South winds to 30 kt becoming southwest early in the
afternoon...then becoming west 10 to 20 kt late in the day.
Occasional gale force gusts in the morning. Showers, mainly in
the afternoon. Waves 7 to 10 ft occasionally to 13 ft subsiding to
5 to 8 ft occasionally to 10 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Showers likely in the evening...then chance of showers
overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.MONDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY NIGHT...Northwest winds to 30 kt becoming north. Chance
of showers in the evening...then showers likely overnight. Waves
2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northwest gales to 35 kt becoming north gales to
40 kt. Showers. Waves building to 8 to 11 ft occasionally to 14
ft.
.TUESDAY NIGHT...North gales to 40 kt becoming northwest to 30 kt
overnight. Rain showers likely. Waves subsiding to 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming north 10 to
20 kt. Waves subsiding to 3 to 5 ft.
.THURSDAY...Southeast winds 10 to 20 kt becoming south to 30 kt
in the afternoon. Waves building to 4 to 6 ft occasionally to 8
ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-221000-
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-
833 PM CDT Sat Oct 21 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds to 30 kt. Slight chance of showers
overnight. Waves 5 to 8 ft occasionally to 10 ft.
.SUNDAY...South winds to 30 kt veering to west 10 to 20 kt late in
the day. Chance of showers and slight chance of thunderstorms in
the morning...then showers in the afternoon. Waves 7 to 10 ft
occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming north.
Showers likely in the evening...then chance of showers overnight.
Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.MONDAY...Northwest winds 10 to 20 kt becoming west. Chance of
showers in the morning. Waves 2 to 4 ft.
.MONDAY NIGHT...Northwest winds to 30 kt. Chance of showers.
Waves 3 to 5 ft building to 5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds to 30 kt increasing to gales to 40 kt
in the afternoon. Showers likely in the morning...then showers in
the afternoon. Waves 6 to 9 ft occasionally to 12 ft building to
8 to 11 ft occasionally to 14 ft.
.TUESDAY NIGHT...Northwest gales to 40 kt diminishing to gales to
35 kt. Rain showers likely. Waves 8 to 12 ft occasionally to
16 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves subsiding to 4 to 7 ft occasionally to 9 ft.
.THURSDAY...South winds 15 to 25 kt increasing to 30 kt. Waves
3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.

$$
LMZ761-221000-
MAFOR 2203/
MICHIGAN NORTH 13440 11440 19450 11446 19456 11546 11626 11726.
Chance of showers late Sunday. Waves 6 to 9 ft occasionally to 12
ft overnight. Waves 7 to 10 feet occasionally to 13 feet subsiding
to 5 to 8 ft occasionally to 10 ft Sunday. Waves 4 to 6 feet
occasionally to 8 feet Sunday evening.

MICHIGAN SOUTH 14440 11440 11446 11626 11726. Chance of showers
late Sunday. Waves 5 to 8 feet occasionally to 10 feet overnight.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 4 to 7
feet occasionally to 9 feet Sunday. Waves 3 to 6 feet
occasionally to 8 feet Sunday evening.

$$


JEE

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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