Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
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
000
FZUS63 KLOT 140243
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
843 PM CST Wed Dec 13 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...Low pressure of 29.3 inches over northwest Ohio this
evening will continue to the mid Atlantic coast Thursday morning.
Weak low pressure of 29.9 inches will develop over Lake Superior
Thursday evening and deepen to 29.6 inches as it moves just north
of Lake Huron Friday evening. High pressure of 30.2 inches will
slide across as it crosses Ontario Friday night and Saturday. The
high will merge with another high, forming a large area of high
averaging 30.4 inches that will extend along the Eastern Seaboard
on Sunday.

LMZ261-362-364-366-563-565-567-868-140900-
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-
843 PM CST Wed Dec 13 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Northeast winds to 30 kt becoming north 15 to
25 kt. Scattered Snow showers. Waves 6 to 9 ft occasionally to 12
ft subsiding to 4 to 7 ft occasionally to 9 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west. Chance of
snow showers. Waves 4 to 7 ft occasionally to 9 ft subsiding to
3 to 5 ft.
.THURSDAY NIGHT...West winds 15 to 25 kt. Chance of snow. Waves
3 to 5 ft.
.FRIDAY...West winds to 30 kt becoming northwest. Chance of snow.
Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.FRIDAY NIGHT...Northwest winds to 30 kt diminishing to 15 to 25
kt. Chance of snow. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to 25
kt. Waves 2 to 4 ft building to 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
snow and rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.

$$

LMZ669-671-673-675-870-872-874-876-140900-
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 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-
843 PM CST Wed Dec 13 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...

.REST OF TONIGHT...Northeast winds to 30 kt becoming north and
diminishing to 15 to 25 kt overnight. Snow showers. Waves 7 to 10
ft occasionally to 13 ft subsiding to 5 to 8 ft occasionally to
10 ft.
.THURSDAY...North winds 10 to 20 kt becoming northwest. Chance of
snow in the morning...then slight chance of snow in the
afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to
3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt increasing to 15 to 25
kt. Chance of snow. Waves 2 to 4 ft building to 4 to 7 ft
occasionally to 9 ft.
.FRIDAY...West winds to 30 kt increasing to gales to 35 kt.
Chance of snow. Waves 7 to 10 ft occasionally to 13 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming northwest. Chance of
snow. Waves 7 to 10 ft occasionally to 13 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Chance of snow in the morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds to 30 kt becoming south 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-777-779-878-140900-
Lake Michigan from Michigan City IN to St. Joseph MI 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 St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
843 PM CST Wed Dec 13 2017

WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...

...GALE WARNING IN EFFECT UNTIL MIDNIGHT CST TONIGHT...

.REST OF TONIGHT...North gales to 35 kt diminishing to 30 kt
after midnight and to 15 to 25 kt toward morning. Snow showers.
Waves 7 to 10 ft occasionally to 13 ft.
.THURSDAY...North winds 15 to 25 kt becoming northwest 10 to 15
kt by afternoon. Snow showers in the morning...then a slight
chance of snow in the afternoon. Waves 5 to 8 ft occasionally to
10 ft subsiding to 3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt increasing to 15 to 25
kt. Chance of snow. Waves 3 to 5 ft building to 4 to 7 ft
occasionally to 9 ft.
.FRIDAY...West winds to 30 kt increasing to gales to 35 kt.
Chance of snow. Waves 7 to 10 ft occasionally to 13 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming northwest. Chance
of snow. Waves 7 to 10 ft occasionally to 13 ft.
.SATURDAY...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Chance of snow in the morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds to 30 kt becoming south 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...South winds 10 to 20 kt becoming southwest. Chance of
rain. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$
LMZ761-140900-
MAFOR 1404/
MICHIGAN NORTH 11147 12837 12720 12620 11630. Chance of snow
showers Thursday. Waves 6 to 9 ft occasionally to 12 ft
subsiding to 4 to 7 ft occasionally to 9 ft tonight. Waves 4 to
7 ft occasionally to 9 ft subsiding to 3 to 5 ft Thursday. Waves
3 to 5 ft Thursday evening.

MICHIGAN SOUTH...Gale Warning in effect...11850 11847 12837
11727 11720 11620 11630. Chance of snow Thursday evening. Waves
7 to 10 ft occasionally to 13 ft tonight. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 3 to 5 ft Thursday. Waves 3
to 5 ft Thursday evening.

$$

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.