Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | 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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
232
FZUS63 KLOT 171948
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
248 PM CDT Tue Oct 17 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...Expansive high pressure of 30.4 inches will settle over
the eastern Ohio Valley and mid Atlantic Coast through Friday.
Meanwhile, low pressure of 29.4 inches near James Bay will move
to northern Quebec tonight. A second and much stronger low
averaging 28.8 inches will take a similar track across northern
Manitoba Wednesday to Hudson Bay on Thursday. The cold front
trailing from this low will move across the lake Wednesday night
into Thursday. Another strong low pressure area will move across
the Canadian Prairies on Friday and Saturday.

LMZ261-362-364-366-563-565-567-669-868-870-180330-
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 Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
248 PM CDT Tue Oct 17 2017

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE
WEDNESDAY NIGHT...

.TONIGHT...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Southwest winds to 30 kt becoming south gales to
45 kt. Waves 5 to 8 ft occasionally to 10 ft building to 10 to
14 ft occasionally to 18 ft.
.WEDNESDAY NIGHT...Southwest gales to 40 kt becoming west to
30 kt after midnight...then diminishing to 15 to 25 kt late.
Waves 10 to 14 ft occasionally to 18 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.THURSDAY...West winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...South winds to 30 kt. Waves 3 to 5 ft building to 4 to
7 ft occasionally to 9 ft.
.FRIDAY NIGHT...South winds to 30 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.SATURDAY...South winds to 30 kt. Chance of showers and
thunderstorms. Waves 6 to 9 ft occasionally to 12 ft.
.SUNDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-180330-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
248 PM CDT Tue Oct 17 2017

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.TONIGHT...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Southwest winds to 30 kt becoming south. Waves 7 to
10 ft occasionally to 13 ft.
.WEDNESDAY NIGHT...Southwest winds to 30 kt becoming west. Waves
6 to 9 ft occasionally to 12 ft.
.THURSDAY...West winds 10 to 20 kt diminishing to 10 to 15 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY NIGHT...South winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft.
.FRIDAY...South winds 15 to 25 kt. Waves 3 to 5 ft.
.FRIDAY NIGHT...South winds to 30 kt. Waves 4 to 6 ft
occasionally to 8 ft building to 4 to 7 ft occasionally to 9 ft.
.SATURDAY...South winds to 30 kt. Waves 4 to 7 ft occasionally to
9 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest. Chance of
showers. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.

$$

LMZ761-180330-
MAFOR 1721/
MICHIGAN NORTH...Gale Warning in effect...12520 13530 11540
12450. Waves 4 to 7 feet occasionally to 9 feet tonight. Waves 5
to 8 feet occasionally to 10 feet building to 10 to 14 feet
occasionally to 18 feet Wednesday.

MICHIGAN SOUTH...13530 14540 11440. Waves 4 to 7 feet occasionally
to 9 feet tonight..building to 7 to 10 feet occasionally to 13
feet Wednesday.

$$

Lenning

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.