Great Lakes Forecast
Issued by NWS

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FZUS63 KLOT 191432
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
832 AM CST Mon Feb 19 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...An elongated trough averaging 29.7 inches stretches
from the Central Plains across central Lake Michigan to far
southern Ontario. The trough will sag very slowly south continuing
to bisect Lake Michigan this evening and will finally clear the
south end of Lake Michigan late Tuesday evening. High pressure of
30.8 inches will build into the Northern Plains Tuesday evening
and will spread across the Great Lakes on Thursday.

LMZ261-362-364-366-563-565-567-669-868-870-192230-
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-
832 AM CST Mon Feb 19 2018

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

.REST OF TODAY...South winds 10 to 15 kt turning abruptly north 15
to 25 kt late this morning, then becoming northeast to 30 kt late
in the afternoon. Rain and snow showers. Patchy fog this
afternoon. Waves 4 to 7 ft occasionally to 9 ft.
.TONIGHT...Northeast winds to 30 kt diminishing to 15 to 25 kt
late. Patchy fog. Rain showers with a chance of freezing rain.
Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY...East winds 10 to 20 kt becoming west. Patchy fog. Rain
showers with light freezing rain likely in the morning...then
rain showers in the afternoon. Waves 4 to 6 ft occasionally to 8
ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt increasing to 15 to
25 kt. Chance of rain, light sleet and light freezing rain in the
evening. Waves 3 to 5 ft building to 4 to 7 ft occasionally to
9 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...North winds 10 to 15 kt becoming northeast.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 15 kt backing to north. Waves 1 to
3 ft subsiding to 1 to 2 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-192230-
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-
832 AM CST Mon Feb 19 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 15 to 25 kt
late. Patchy fog. Rain showers with a slight chance of afternoon
thunderstorms. Waves 3 to 5 ft.
.TONIGHT...Southwest winds 15 to 25 kt. Patchy fog. Rain showers
with a chance of thunderstorms. Waves 4 to 6 ft occasionally to 8
ft.
.TUESDAY...South winds to 30 kt becoming southwest. Patchy fog.
Rain showers. Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt. Rain in the
evening...then chance of rain and light sleet overnight. Waves
3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.THURSDAY...Northeast winds 10 to 20 kt becoming east. Waves 2 to
4 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Chance of
rain and snow. Waves 1 to 3 ft.

$$
LMZ761-192230-
MAFOR 1916/
MICHIGAN NORTH 11410 19820 11837 14146 11136 11226. Patchy fog
this afternoon onward. Waves 4 to 7 ft occasionally to 9 ft.

MICHIGAN SOUTH 12426 11436 14536 11446. Patchy fog. Chance of
thunderstorms tonight. Waves 3 to 5 ft today building to 4 to 6
ft occasionally to 8 ft early this evening.

$$

MTF

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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