Great Lakes Forecast
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FZUS63 KLOT 250739
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
239 AM CDT Fri May 25 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...High pressure of 30.2 inches over the Mid Atlantic
shore will drift eastward today while broad low pressure of 29.5
inches across the Canadian Prairies very slowly moves southeast.
This low will reach the western Great Lakes by Saturday evening,
weakening slightly to 29.7 inches as it does so. The low will
further weaken to a trough of 29.8 inches and pass across the
lake late in the weekend. High pressure of 30.1 inches will build
from eastern Canada into the central and eastern Great Lakes by
the middle of next week.


LMZ261-362-364-366-563-565-567-868-251530-
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-
239 AM CDT Fri May 25 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt by
late morning. Chance of showers and thunderstorms this afternoon.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.TONIGHT...Southwest winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 3 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.SATURDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt
by early afternoon. Chance of showers and thunderstorms, mainly
in the afternoon. Waves 1 to 3 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of showers and thunderstorms in the evening. Waves
1 to 3 ft.
.SUNDAY...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.MONDAY...South winds 5 to 10 kt veering to northwest. Waves 1 to
2 ft.
.TUESDAY...Northeast winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-251530-
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-
239 AM CDT Fri May 25 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt after midnight. Chance of showers and thunderstorms, mainly
overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...Southwest winds 10 to 15 kt becoming south by early
afternoon. Waves 1 to 3 ft.
.SATURDAY NIGHT...South winds 10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south. Waves 1 to
3 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt becoming southwest. Waves
1 to 2 ft.
.MONDAY...Northwest winds 5 to 10 kt becoming north. Waves 1 to 2
ft.
.TUESDAY...Northeast winds 10 to 15 kt. Waves 1 to 3 ft.

$$

LMZ761-251530-
MAFOR 2509/
MICHIGAN NORTH 12520 13530 13520. Chance of showers and
thunderstorms this afternoon and tonight. Waves 2 to 4 ft
building to 4 to 6 ft occasionally to 8 ft this afternoon.
Waves 3 to 6 ft occasionally to 8 ft this evening subsiding to 2
to 4 ft overnight.

MICHIGAN SOUTH 15420 11420 11510. Chance of showers and
thunderstorms overnight. Waves 2 to 4 ft through this evening,
subsiding to 1 to 3 ft overnight.

$$

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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