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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
886
FZUS63 KLOT 201943
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
243 PM CDT Sun Aug 20 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...A cold frontal trough, averaging 30.0 inches, will
settle across the northern Lakes tonight before becoming nearly
stationary. An area of low pressure of 29.6 inches will develop
along the front over the northern Lakes Monday night, and will
move east into far southwestern Ontario early Tuesday while the
cold front pushes southeast across Lake Michigan. The low will
then deepen to 29.4 inches over southern Quebec Tuesday evening
while the front continues through the Ohio Valley. Expansive high
pressure of 30.1 inches will spread from the Canadian prairies to
the western Lakes Wednesday night, and will linger through the
end of the week.

LMZ261-362-364-366-563-565-567-868-210315-
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 PM CDT Sun Aug 20 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 15 to 25 kt becoming southwest and
diminishing to 10 to 15 kt. Chance of showers and thunderstorms.
Waves 3 to 5 ft subsiding to 2 to 4 ft late.
.MONDAY...Southwest winds 5 to 10 kt becoming south. Chance of
showers and thunderstorms. Waves 2 to 4 ft subsiding to 1 to 3
ft.
.MONDAY NIGHT...South winds 10 to 15 kt becoming west 10 to
20 kt. Chance of showers and thunderstorms in the evening... then
showers and thunderstorms overnight. Waves 1 to 3 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Chance of showers in the
morning. Waves 2 to 4 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt increasing to 15 to
25 kt. Waves 3 to 5 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming north. Waves
3 to 5 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.
.FRIDAY...Southeast winds 5 to 10 kt. Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210315-
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 PM CDT Sun Aug 20 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 20 kt. Slight chance of showers and
thunderstorms. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.MONDAY...South winds 10 to 15 kt. Chance of showers and
thunderstorms in the morning...then slight chance of showers and
thunderstorms in the afternoon. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Showers and thunderstorms likely. Waves 2 to 4 ft.
.TUESDAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt.
Chance of showers and thunderstorms in the morning. Waves 3 to
5 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 3 to 5 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming north. Waves
3 to 5 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 2 to 4 ft.
.THURSDAY...Northeast winds 10 to 15 kt. Waves 1 to 3 ft.
.FRIDAY...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ761-210315-
MAFOR 2021/
MICHIGAN NORTH 12430 11530 11539 11510 11500 12510. Chance of
thunderstorms late this evening and on Monday. Waves 3 to 5 feet
subsiding to 2 to 4 feet by early Monday.

MICHIGAN SOUTH 12420 14410 11510 11410. Chance of showers and
thunderstorms late Monday. Waves 2 to 4 ft subsiding to 1 to 3
feet tonight and continuing Monday.

$$

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.