Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FZUS63 KLOT 270755
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
255 AM CDT Fri Apr 27 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...Low pressure of 29.7 inches over Minnesota will
deepen slightly as it tracks southeast to northeast Illinois by
early this evening, then will combine with another low over the
eastern Lakes by early Saturday. This low will then slowly fill as
it moves across New England Saturday and Saturday night, while
high pressure of 30.3 inches builds south from Ontario and the
northern Lakes to the western Lakes by early Sunday. This high
will continue to settle to the south across the Ohio and Tennessee
River Valleys Sunday night. Low pressure of 29.6 inches will then
develop northeastward across the Upper Mississippi Valley and
northern Lakes Tuesday.

LMZ261-362-364-366-563-565-567-868-271515-
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 AM CDT Fri Apr 27 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...North winds 15 to 20 kt diminishing to 10 to 15 kt this
afternoon. Chance of rain showers this afternoon. Waves 3 to 5 ft
subsiding to 1 to 3 ft.
.TONIGHT...North winds quickly increasing to 30 kt in the evening.
Slight chance of rain showers in the evening. Waves 1 to 3 ft
building to 5 to 8 ft occasionally to 10 ft.
.SATURDAY...North winds to 30 kt. Waves 7 to 10 ft occasionally
to 13 ft.
.SATURDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt overnight. Waves 4 to 7 ft occasionally to 9 ft subsiding
to 3 to 5 ft.
.SUNDAY...Northwest winds 5 to 10 kt backing to southwest 10 to
15 kt. Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 2 to 4 ft.
.MONDAY...South winds 15 to 25 kt increasing to 30 kt. Waves 3 to
5 ft building to 4 to 7 ft occasionally to 9 ft.
.TUESDAY...South winds to 30 kt. Waves 4 to 7 ft occasionally to
9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-271515-
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 AM CDT Fri Apr 27 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...North winds 15 to 25 kt becoming northeast 10 to 20 kt
this afternoon. Rain showers likely with slight chance of
thunderstorms this afternoon. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.TONIGHT...Northeast winds 15 to 25 kt becoming north to 30 kt.
Chance of rain showers and slight chance of thunderstorms in the
evening. Waves 3 to 5 ft building to 6 to 9 ft occasionally to
12 ft.
.SATURDAY...North winds to 30 kt. Waves 7 to 10 ft occasionally
to 13 ft.
.SATURDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt
overnight. Waves 6 to 9 ft occasionally to 12 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northwest winds 5 to 10 kt backing to southwest. Waves
2 to 4 ft subsiding to 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt. Waves 1 to 3 ft.
.MONDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.TUESDAY...South winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft.

$$

LMZ761-271515-
MAFOR 2709/
MICHIGAN NORTH 11830 11820 11810 12820 11830 12840. Chance of rain
showers this afternoon and evening. Waves 3 to 5 ft subsiding to
1 to 3 ft today, then building to 5 to 8 ft occasionally to 10
ft tonight.

MICHIGAN SOUTH 11840 11830 12820 11126 11130 12840. Chance of
rain showers tonight. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft today. Waves 2 to 4 ft building to 6 to 9
ft occasionally to 12 ft tonight.

$$

Ratzer

Experimental modernized open lake forecast is available online at
weather.gov/lot/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.