Great Lakes Forecast
Issued by NWS

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000
FZUS63 KLOT 190239
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
839 PM CST Sun Feb 18 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 29.6 inches will move across the
northern lakes region tonight. This low will drag a cold front
across central Lake Michigan by early Monday. A series of weaker
low pressure systems will move along the cold front through
Tuesday before the cold front drifts off to the southeast Tuesday
night. Strong high pressure of 30.7 inches will build in behind
the front Wednesday and weaker ridging will linger across the
western Lakes Thursday.

LMZ261-362-364-366-563-565-567-868-190900-
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-
839 PM CST Sun Feb 18 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

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

.REST OF TONIGHT...South gales to 40 kt becoming southwest 15 to
25 kt overnight. Waves 10 to 14 ft occasionally to 18 ft
subsiding to 7 to 10 ft occasionally to 13 ft.
.MONDAY...West winds 10 to 20 kt veering to northeast to 30 kt
from late morning on. Chance of rain and snow showers in the
morning...then a wintry mix in the afternoon. Areas of fog in
the afternoon. Waves 4 to 7 ft occasionally to 9 ft building to
5 to 8 ft occasionally to 10 ft late.
.MONDAY NIGHT...Northeast winds 15 to 25 kt. Wintry mix. Waves 5
to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally
to 8 ft.
.TUESDAY...East winds 10 to 20 kt veering to southwest. Rain,
freezing rain, or sleet in the morning...then rain showers in the
afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft in the
afternoon.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt. Rain and light
freezing rain likely in the evening. Waves 2 to 4 ft building to
3 to 5 ft overnight.
.WEDNESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY...East winds 5 to 10 kt. Waves 1 to 2 ft.
.FRIDAY...Southeast winds 10 to 15 kt. Chance of rain and snow.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190900-
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-
839 PM CST Sun Feb 18 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

.REST OF TONIGHT...South gales to 35 kt diminishing to 15 to 25
kt overnight. Slight chance of rain showers overnight. Waves 8
to 12 ft occasionally to 16 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.MONDAY...Southeast winds 10 to 20 kt increasing to 15 to 25 kt.
Areas of dense fog. Chance of rain showers in the morning...then
rain showers and slight chance of thunderstorms in the afternoon.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft...
then building to 4 to 7 ft occasionally to 9 ft late.
.MONDAY NIGHT...Southeast winds to 30 kt. Rain showers. A chance
of thunderstorms in the evening. Waves 5 to 8 ft occasionally to
10 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.TUESDAY...South winds 15 to 25 kt. Rain showers. Waves 3 to 5
ft.
.TUESDAY NIGHT...West winds 10 to 20 kt becoming northwest 15 to
25 kt. Rain in the evening...then rain with a chance of light
sleet overnight. Waves 2 to 4 ft building to 3 to 5 ft overnight.
.WEDNESDAY...North winds 10 to 20 kt. Chance of rain in the
morning. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY...Northeast winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...Southeast winds 10 to 15 kt. Chance of rain and snow.
Waves 2 to 4 ft.

$$
LMZ761-190900-
MAFOR 1904/
MICHIGAN NORTH...Gale Warning in effect...11450 11440 11530
11510 11830 12147 11137. Chance of rain and snow showers Monday
morning. Areas of fog Monday afternoon. Waves 10 to 14 ft
occasionally to 18 ft subsiding to 7 to 10 ft occasionally to
13 ft overnight. Waves 4 to 7 ft occasionally to 9 ft building
to 5 to 8 ft occasionally to 10 ft late Monday afternoon. Waves
5 to 8 ft occasionally to 10 ft Monday evening.

MICHIGAN SOUTH...Gale Warning in effect...11450 11440 11430
11420 11326 12336 11346. Areas of dense fog Monday. Chance of
thunderstorms Monday evening. Waves 8 to 12 ft occasionally to
16 ft subsiding to 5 to 8 ft occasionally to 10 ft tonight.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft...
then building to 4 to 7 ft occasionally to 9 ft late Monday.
Waves 5 to 8 ft occasionally to 10 ft Monday evening.

$$

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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