Great Lakes Forecast
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247
FZUS63 KLOT 200121
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
821 PM CDT Tue Sep 19 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...Weak high pressure of 30.0 inches across Lake
Michigan will drift east tonight. Low pressure of 29.3 inches
across the Canadian prairie provinces will gradually weaken
through midweek with an associated trough of low pressure around
29.8 inches weakening as it approaches the lake late Wednesday
night. High pressure around 30.1 inches will prevail across the
central and eastern Great Lakes during the latter part of the week
and into the weekend.

LMZ261-362-364-366-563-565-567-868-200915-
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-
821 PM CDT Tue Sep 19 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...East winds 10 to 20 kt becoming southeast
after midnight, then diminishing to 10 to 15 kt late. Waves 2 to 4
ft subsiding to 1 to 3 ft overnight.
.WEDNESDAY...Southeast winds 10 to 20 kt becoming south 15 to 25
kt in the late morning. Waves building to 3 to 5 ft.
.WEDNESDAY NIGHT...South winds 10 to 20 kt veering to north 10 to
15 kt overnight. Chance of showers and thunderstorms. Waves
subsiding to 2 to 4 ft.
.THURSDAY...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-200915-
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-
821 PM CDT Tue Sep 19 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northeast winds 10 to 15 kt becoming southeast
after midnight. Waves 1 to 3 ft.
.WEDNESDAY...Southeast winds 10 to 20 kt increasing to 15 to
25 kt in the early afternoon. Waves building to 3 to 5 ft.
.WEDNESDAY NIGHT...South winds 10 to 20 kt becoming southwest
10 to 15 kt overnight. Chance of showers and thunderstorms. Waves
subsiding to 1 to 3 ft.
.THURSDAY...South winds 5 to 10 kt becoming southeast. Waves 1 to
3 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 15 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.SUNDAY...South winds 10 to 15 kt. Waves 1 to 3 ft.

$$
LMZ761-200915-
MAFOR 2003/
MICHIGAN NORTH 11220 11320 11310 11320 13430 11420. Waves 2 to 4
ft subsiding to 1 to 3 ft tonight, then building to 3 to 5 ft
Wednesday.

MICHIGAN SOUTH 11110 11210 11310 12320 12330 11420. Waves 1 to 3
ft tonight building to 3 to 5 ft Wednesday.

$$

- Izzi

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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