Great Lakes Forecast
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FZUS63 KLOT 170837
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
237 AM CST Sat Feb 17 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...High pressure of 30.4 inches will move off the
Atlantic coast today, while low pressure of 29.3 inches passes
well north of the Lakes across Hudson Bay. A cold front trailing
this low will move across the lake late this afternoon into this
evening. High pressure of 30.3 inches will move into the Ohio
Valley by early Sunday, with weaker ridging extending north
across the western Lakes. Low pressure of 29.6 inches will move
northeast from the Plains to the northern Lakes by Sunday night,
trailing a cold front across northern parts of the Lake early
Monday. This front will become nearly stationary, with another
low of 29.7 inches tracking along the boundary and across the
lake later in the day. Another weak wave will move along the
front on Tuesday, before the front slowly moves southeast Tuesday
night. High pressure of 30.6 inches builds into the region early
Thursday.

LMZ261-362-364-366-563-565-567-868-171630-
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-
237 AM CST Sat Feb 17 2018

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING...

.TODAY...Southwest winds to 30 kt. Occasional gale force gusts to
35 kt possible late morning through mid afternoon. Freezing spray
this morning. Slight chance of snow this morning...then chance of
snow this afternoon. Waves 4 to 7 ft occasionally to 9 ft building
to 7 to 10 ft occasionally to 13 ft.
.TONIGHT...West winds to 30 kt diminishing to 10 to 20 kt. Slight
chance of snow in the evening. Waves 5 to 8 ft occasionally to
10 ft subsiding to 4 to 7 ft occasionally 9 ft tonight.
.SUNDAY...West winds 5 to 10 kt becoming south 10 to 20 kt late
in the morning...then increasing to gales to 35 kt early in the
afternoon increasing to gales to 40 kt late. Chance of snow in
the afternoon. Waves 3 to 5 ft building to 8 to 12 ft
occasionally to 16 ft.
.SUNDAY NIGHT...South gales to 40 kt becoming southwest to 30 kt
overnight. Chance of snow in the evening. Waves 10 to 14 ft
occasionally to 18 ft subsiding to 8 to 11 ft occasionally to
14 ft.
.MONDAY...North winds 10 to 20 kt becoming northeast 15 to 25 kt.
Chance of snow and rain showers in the morning...then rain and
snow showers in the afternoon. Waves 4 to 6 ft occasionally to
8 ft building to 4 to 7 ft occasionally to 9 ft.
.MONDAY NIGHT...Northeast winds 15 to 25 kt diminishing to 10 to
20 kt. Snow showers likely, possibly mixed with rain, freezing
rain and sleet. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northeast winds 10 to 20 kt becoming north. Sleet,
rain showers, snow showers likely with a chance of freezing rain.
Waves 3 to 5 ft.
.WEDNESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-171630-
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-
237 AM CST Sat Feb 17 2018

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING...

.TODAY...Southwest winds 15 to 25 kt increasing to 30 kt this
morning. Snow this afternoon. Waves 3 to 5 ft building to 4 to 7
ft occasionally to 9 ft.
.TONIGHT...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Slight chance of snow in the evening. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 15 to 25 kt
late in the morning...then increasing to gales to 35 kt early in
the afternoon increasing to gales to 40 kt late. Waves 2 to 4 ft
building to 8 to 11 ft occasionally to 14 ft.
.SUNDAY NIGHT...South gales to 40 kt diminishing to 30 kt
overnight. Chance of rain overnight. Waves 8 to 11 ft
occasionally to 14 ft subsiding to 6 to 9 ft occasionally to
12 ft.
.MONDAY...South winds 10 to 20 kt becoming southeast at 20 to 25
kt in the afternoon. Rain showers likely in the morning... then
rain showers in the afternoon. Waves 4 to 6 ft occasionally to 8
ft.
.MONDAY NIGHT...Northwest winds to 30 kt becoming north 10 to
20 kt overnight. Rain showers with a chance of light freezing
rain. Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northeast winds 10 to 20 kt becoming north 15 to
25 kt. Rain showers. Waves 3 to 5 ft.
.WEDNESDAY...North winds 10 to 20 kt. Chance of snow. Waves 4 to
6 ft occasionally to 8 ft.

$$

LMZ761-171630-
MAFOR 1710/
MICHIGAN NORTH 13540 11547 11540 12640 11630. Chance of snow this
afternoon. Waves 4 to 7 ft occasionally to 9 ft building to 7 to
10 ft occasionally to 13 ft today. Waves subsiding to 4 to 7 ft
occasionally to 9 ft late tonight.

MICHIGAN SOUTH 11530 12540 11547 11537 13630. Waves 3 to 5 ft
building to 4 to 7 ft occasionally to 9 ft today. Waves 4 to 7 ft
occasionally to 9 ft tonight.

$$

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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