Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 121950
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
250 PM CDT Sat Aug 12 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 29.7 inches over southeastern Quebec
will lift northeast to northeastern Quebec tonight. Meanwhile,
high pressure of 30.1 inches over the upper Mississippi Valley
will slowly spread east across the Great Lakes tonight and
Sunday. A ridge of high pressure will linger across Great Lakes
through Monday night. Low pressure of 29.5 inches is expected to
move out of the central Rockies and into the western plains
Tuesday and then move east across the Plains Wednesday and
reaches western Lake Superior by Wednesday night. The low will
then lift northeast into southwestern Ontario Thursday evening as
an associated cold front sweeps across Lake Michigan.

LMZ261-362-364-366-563-565-130330-
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-
250 PM CDT Sat Aug 12 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.TONIGHT...Northwest winds 10 to 15 kt becoming west. Waves 2 to
4 ft subsiding to 1 ft or less.
.SUNDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 1 to 2 ft.
.SUNDAY NIGHT...Southwest winds 10 to 15 kt becoming south 5 to
10 kt. Waves 1 to 2 ft.
.MONDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.MONDAY NIGHT...Southeast winds 10 to 15 kt becoming east. Waves
1 to 2 ft.
.TUESDAY...Southeast winds 10 to 15 kt becoming east. Waves 1 to
2 ft.
.TUESDAY NIGHT...East winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 3 ft.
.WEDNESDAY...Southeast winds 10 to 20 kt. Chance of showers.
Waves 2 to 4 ft.
.THURSDAY...West winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft subsiding to 1 to 3 ft.

$$

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-130330-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 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 Pentwater to Manistee MI 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-
250 PM CDT Sat Aug 12 2017

TWO RIVERS WI TO MANISTEE MI SOUTH...

.TONIGHT...North winds 10 to 20 kt becoming northwest 5 to 10 kt.
Waves 4 to 6 ft occasionally to 8 feet subsiding to 2 to 4 ft.
.SUNDAY...Southeast winds 5 to 10 kt becoming southwest. Waves
1 to 3 ft.
.SUNDAY NIGHT...Southeast winds 10 to 15 kt becoming south. Waves
1 ft or less.
.MONDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Waves
1 to 2 ft.
.MONDAY NIGHT...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
.TUESDAY...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
.TUESDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 3 ft.
.WEDNESDAY...South winds 10 to 20 kt. Chance of showers. Waves
2 to 4 ft.
.THURSDAY...West winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.

$$

LMZ761-130330-
MAFOR 1221/
MICHIGAN NORTH 12710 11700 12600 13510. Waves 2 to 4 feet
subsiding to 1 foot or less tonight. Waves 1 to 2 ft Sunday.

MICHIGAN SOUTH 12820 11810 11710 11700 11200 12400. Waves 4 to 6
feet occasionally to 8 feet subsiding to 2 to 4 feet tonight.
Waves 1 to 3 feet Sunday.

$$

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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