Great Lakes Forecast
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FZUS63 KLOT 201950
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
250 PM CDT Wed Sep 20 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...A high pressure ridge averaging 30.0 inches will
remain over the eastern U.S. through early next week. The 29.3
inch low over Saskatchewan will deepen to 29.1 inches and then
weaken as it reaches Hudson Bay Friday. A weak cold front will
move south to central portions of the lake Thursday...then lift
back north as a warm front Thursday night. A trough of low
pressure averaging 29.7 inches will stretch from the northern
Mississippi Valley through the southern Plains Friday. This
trough will remain stationary and gradually weaken through
early next week.

LMZ261-362-364-366-563-565-567-868-210200-
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-
250 PM CDT Wed Sep 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 20 kt veering to northwest 10 to
15 kt. Chance of showers and thunderstorms this evening...then
chance of showers and slight chance of thunderstorms overnight.
Patchy fog overnight. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.THURSDAY...Northeast winds 10 to 20 kt diminishing to 10 to 15
kt late in the morning...then becoming east 5 to 10 kt late.
Waves 1 to 3 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10
to 20 kt. Waves 1 to 3 ft.
.FRIDAY THROUGH MONDAY...South winds 10 to 20 kt. Waves 2 to 4
ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210200-
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-
250 PM CDT Wed Sep 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 20 kt. Slight chance of showers this
evening. Patchy fog overnight. Waves 3 to 5 ft subsiding to 2 to
4 ft.
.THURSDAY...South winds 10 to 15 kt becoming southeast. Waves 1
to 3 ft.
.THURSDAY NIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 1 to 3 ft.
.FRIDAY THROUGH SATURDAY...South winds 10 to 20 kt. Waves 2 to 4
ft.
.SATURDAY NIGHT THROUGH MONDAY...South winds 10 to 15 kt. Waves
1 to 3 ft.

$$

LMZ761-210200-
MAFOR 2021/
MICHIGAN NORTH 13420 11510 19710 11710 12110 11200. Chance of
showers and thunderstorms this evening. Chance of showers
overnight. Patchy fog overnight. Waves 3 to 5 ft subsiding to
2 to 4 ft tonight. Waves 1 to 3 ft Thursday.

MICHIGAN SOUTH 14420 13410 11310. Patchy fog overnight. Waves
3 to 5 ft subsiding to 2 to 4 ft tonight. Waves 1 to 3 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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