Great Lakes Forecast
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129
FZUS63 KLOT 171955
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
255 PM CDT Tue Apr 17 2018

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 weak ridge of high pressure averaging 30.1 inches
over the Mississippi River Valley will spread across the western
Great Lakes tonight. Low pressure of 29.3 inches will track from
the Southern Plains Tuesday evening to just south of Lake Michigan
by Wednesday afternoon. The low will reach New England Thursday
afternoon while a 30.5 inch high builds over the Great Plains. The
high will settle over the western Great Lakes Friday and
Saturday.

LMZ261-362-364-366-563-565-567-868-180315-
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-
255 PM CDT Tue Apr 17 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds 15 to 25 kt veering to north 10 to 15
kt overnight. Waves 3 to 5 ft subsiding to 2 to 4 ft overnight.
.WEDNESDAY...Northeast winds 10 to 20 kt increasing to 15 to 25
kt late. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8
ft late.
.WEDNESDAY NIGHT...North winds to 30 kt with a few gale force
gusts to 35 kt overnight. Chance of snow in the evening. Waves 4
to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to
12 ft overnight.
.THURSDAY...North winds to 30 kt. Waves 7 to 10 ft occasionally
to 13 ft subsiding to 6 to 9 ft occasionally to 12 ft in the
afternoon.
.THURSDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt overnight. Waves 3 to 5 ft subsiding to 2 to 4 ft
overnight.
.FRIDAY...North winds 5 to 10 kt becoming west. Waves 1 to 3 ft.
.FRIDAY NIGHT...Southwest winds 5 to 10 kt becoming south. Waves
1 ft or less.
.SATURDAY...South winds 5 to 10 kt. Waves 1 ft or less.
.SUNDAY...South winds 5 to 10 kt. Waves nearly calm.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180315-
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-
255 PM CDT Tue Apr 17 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northwest winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt shifting east mid
morning, then increasing to northeast 15 to 25 kt late. Chance of rain
and light sleet in the morning, then rain, snow, light sleet and
slight chance of freezing rain in the afternoon. Waves 2 to 4 ft
building to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...North winds to 30 kt. Snow in the evening,
then chance of snow overnight. Waves 6 to 9 ft occasionally to
12 ft.
.THURSDAY...North winds to 30 kt. Waves 7 to 10 ft occasionally
to 13 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft overnight.
.FRIDAY...North winds 10 to 15 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 to 2 ft.
.SATURDAY...Southeast winds 5 to 10 kt becoming southwest. Waves
1 ft or less.
.SUNDAY...Northeast winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ761-180315-
MAFOR 1721/
MICHIGAN NORTH 11730 13720 11810 12120 11130. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft tonight. Waves 2 to 4
ft building to 3 to 5 ft Wednesday.

MICHIGAN SOUTH 11720 11820 12810 11110 11220 11130 11137. Chance
of light sleet late Wednesday. Waves 4 to 6 ft occasionally to 8
ft subsiding to 2 to 4 ft tonight. Waves 2 to 4 ft building to 3
to 6 ft occasionally to 8 ft late Wednesday.

$$


KMD

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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