Great Lakes Forecast
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000
FZUS63 KLOT 220738
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
238 AM CDT Sun Apr 22 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...Expansive high pressure of 30.5 inches centered over
the eastern Great Lakes will drift to offshore of the Northeast by
Monday evening. Meanwhile, low pressure of 29.7 inches across the
Lower Mississippi Valley will gradually weaken as it drifts
northeast through Monday. Low pressure passing well to the north
over Hudson Bay will usher a cold front across the lake Tuesday
night. Weakening high pressure of 30.2 inches will then move over
the lake on Wednesday night. This will be followed by low pressure
moving from the Canadian Prairies to the Great Lakes late in the
week.


LMZ261-362-364-366-563-565-567-868-221530-
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-
238 AM CDT Sun Apr 22 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds less than 10 kt becoming variable in the
early afternoon. Waves nearly calm.
.TONIGHT...East winds 5 to 10 kt becoming southeast after
midnight. Waves 1 ft or less.
.MONDAY...Southeast winds 5 to 10 kt backing to northeast and
increasing to 10 to 15 kt by late afternoon. Waves 1 to 2 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming east less
than 10 kt. Waves 1 to 2 ft.
.TUESDAY...Variable winds less than 10 kt becoming northwest 10
to 15 kt in the afternoon. Waves 1 to 2 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt increasing to 30 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.THURSDAY...Southwest winds 15 to 25 kt becoming south. Waves
3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-221530-
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-
238 AM CDT Sun Apr 22 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt by
early afternoon, then increasing to 10 to 20 kt late in the
afternoon. Waves 1 ft or less building to 1 to 3 ft.
.TONIGHT...Northeast winds 10 to 20 kt diminishing to 10 to 15 kt
after midnight. Waves 1 to 3 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt
in the afternoon. Waves 1 to 3 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to 10
kt overnight. Chance of rain showers overnight. Waves 1 to 3 ft.
.TUESDAY...Northeast winds 5 to 10 kt becoming north. Chance of
rain showers in the morning. Waves 1 to 2 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt increasing to 30 kt.
Waves 2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...North winds to 30 kt diminishing to 15 to 25 kt.
Waves 5 to 8 ft occasionally to 10 ft.
.THURSDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 3 to 5 ft.

$$

LMZ761-221530-
MAFOR 2209/
MICHIGAN NORTH 13400 12900 12200 11300. Waves 1 ft or less.

MICHIGAN SOUTH 13200 11110 13120 11110. Waves 1 ft or less
building to 1 to 3 ft this afternoon.

$$

MTF

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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