Great Lakes Forecast
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913
FZUS63 KLOT 230743
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
243 AM CDT Sun Jul 23 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...Broad low pressure of 29.8 inches across Lake
Michigan and lower Michigan will move southeast through today,
with a trailing cold front moving south over the lake this
afternoon and evening. This low pressure will move to the
northeast by late Monday morning while high pressure of 30.1
inches builds over the Great Lakes. This high will persist through
Tuesday before shifting east Tuesday night. Low pressure of 29.5
inches will then move east to James Bay by Wednesday. A trailing
cold front will push south across the lake on Wednesday night
before high pressure builds over the lake again for the end of the
week.

LMZ261-362-364-366-563-565-567-868-231515-
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-
243 AM CDT Sun Jul 23 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Variable winds 5 to 10 kt becoming west 10 to 15 kt after
sunrise, then becoming northwest 10 to 20 kt late this morning
before becoming north early this afternoon. Slight chance of
showers and thunderstorms. Waves 1 to 3 ft building to 2 to 4 ft
this afternoon.
.TONIGHT...Northeast winds 10 to 20 kt increasing to 15 to 25 kt
late this evening. Slight chance of showers in the evening. Waves
3 to 5 ft.
.MONDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt
late in the morning. Waves 3 to 5 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt veering to southeast.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TUESDAY...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.WEDNESDAY...South winds 15 to 25 kt becoming southwest. Chance
of showers and thunderstorms. Waves 3 to 5 ft.
.THURSDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-231515-
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-
243 AM CDT Sun Jul 23 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Variable winds around 10 kt becoming west 10 to 15 kt
after sunrise, then veering to north in the afternoon. Slight
chance of showers and thunderstorms. Waves 1 to 3 ft building to
2 to 4 ft late in the day.
.TONIGHT...North winds 10 to 20 kt increasing to 15 to 25 kt after
midnight. Waves 2 to 4 ft building to 3 to 5 ft.
.MONDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt in
the afternoon. Waves 3 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Northeast winds 10 to 20 kt veering to southeast
10 to 15 kt. Waves subsiding to 2 to 4 ft.
.TUESDAY...Southeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TUESDAY NIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 1 to 3 ft.
.WEDNESDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves building to 3 to 5 ft.

$$

LMZ761-231515-
MAFOR 2309/
MICHIGAN NORTH 11900 11610 11720 12820 11120 12130. Waves 1 to 3
ft building to 2 to 4 ft this afternoon, building to 3 to 5 ft
early this evening.

MICHIGAN SOUTH 11900 12610 11710 11810 12820 11830. Waves 1 to 3
ft building to 2 to 4 ft late in the day, further building to 3
to 5 ft during the late evening.

$$

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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