Great Lakes Forecast
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FZUS63 KLOT 121944
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
244 PM CDT Thu Apr 12 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 29.4 inches over Lake Huron will move
up the St Lawrence River Valley this evening. A trailing cold
front will push just south of the lake tonight and stall out over
northern Illinois and Indiana tomorrow.  Low pressure of 29.1
inches will then gradually track eastward to the Lower Great Lakes
region while weakening to 29.5 inches through Sunday. Meanwhile,
the ridge will strengthen to 30.7 inches over far northern
Ontario. The low will continue eastward on Monday as 30.3 inch
ridge builds across the Missouri River Valley.

LMZ261-362-364-366-563-565-567-669-868-870-130315-
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-
244 PM CDT Thu Apr 12 2018

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

...GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH SUNDAY
EVENING...

.TONIGHT...Northeast winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of rain showers overnight. Waves 3 to 5 ft.
.FRIDAY...Northeast winds 15 to 25 kt increasing to gales to
40 kt. Rain showers likely with possible snow showers and
thunderstorms in the morning, then rain showers, snow showers and
freezing rain in the afternoon. Waves 4 to 7 ft occasionally to
9 ft building to 8 to 11 ft occasionally to 14 ft.
.FRIDAY NIGHT...Northeast gales to 45 kt. Rain showers, snow
showers, freezing rain with a chance of light sleet in the
evening, then rain showers, snow showers, sleet and freezing rain
overnight. Waves 12 to 16 ft occasionally to 21 ft.
.SATURDAY...Northeast gales to 45 kt diminishing to gales to
40 kt. Rain showers with snow showers and light sleet likely in
the morning, then light sleet, rain showers likely with a chance
of snow showers in the afternoon. Waves 12 to 16 ft occasionally
to 21 ft.
.SATURDAY NIGHT...Northeast gales to 40 kt. Light sleet, rain
likely with a chance of snow in the evening, then light sleet,
freezing rain and snow likely overnight. Waves 10 to 14 ft
occasionally to 18 ft.
.SUNDAY...Northeast gales to 40 kt. Snow, light sleet likely with
rain in the morning, then light sleet and snow likely in the
afternoon. Waves 10 to 14 ft occasionally to 18 ft.
.SUNDAY NIGHT...North gales to 35 kt. Chance of snow and freezing
rain likely. Waves 8 to 12 ft occasionally to 16 ft.
.MONDAY...North gales to 35 kt. Chance of rain and snow. Waves
8 to 12 ft occasionally to 16 ft.
.TUESDAY...Northwest winds to 30 kt becoming north 15 to 25 kt.
Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-130315-
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-
244 PM CDT Thu Apr 12 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

...GALE WARNING IN EFFECT FROM LATE FRIDAY NIGHT THROUGH SUNDAY
MORNING...

.TONIGHT...Northeast winds 10 to 20 kt becoming east 15 to 25 kt.
Chance of rain showers. Waves 3 to 5 ft.
.FRIDAY...East winds 15 to 25 kt becoming northeast to 30 kt.
Chance of rain showers and slight chance of thunderstorms in the
morning, then chance of rain showers in the afternoon. Waves 4 to
6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to
10 ft.
.FRIDAY NIGHT...East gales to 40 kt becoming northeast gales to
45 kt. Rain showers. Waves 8 to 11 ft occasionally to 14 ft
building to 10 to 14 ft occasionally to 18 ft.
.SATURDAY...Northeast gales to 45 kt diminishing to gales to
40 kt. Rain showers in the morning, then rain showers likely in
the afternoon. Waves 10 to 14 ft occasionally to 18 ft.
.SATURDAY NIGHT...East gales to 40 kt becoming northeast gales to
35 kt. Rain likely in the evening, then rain overnight. Waves
8 to 11 ft occasionally to 14 ft.
.SUNDAY...Northeast gales to 35 kt becoming north. Rain in the
morning, then rain likely with a chance of light sleet in the
afternoon. Waves 7 to 10 ft occasionally to 13 ft building to
8 to 12 ft occasionally to 16 ft.
.SUNDAY NIGHT...North gales to 35 kt. Chance of snow, rain likely
with a chance of freezing rain. Waves 8 to 12 ft occasionally to
16 ft.
.MONDAY...Northwest gales to 35 kt. Chance of rain and snow.
Waves 8 to 12 ft occasionally to 16 ft.
.TUESDAY...Northwest winds to 30 kt becoming north 10 to 20 kt in
the afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 6 ft occasionally to 8 ft.

$$

LMZ761-130315-
MAFOR 1221/
MICHIGAN NORTH 11820 11110 11120 13130 12147. Chance of rain
showers late this evening tonight. Chance of snow showers late
Friday. Waves 3 to 5 ft subsiding to 2 to 4 ft, then building to 3
to 5 ft tonight. Waves 4 to 6 ft occasionally to 8 ft building to
6 to 9 ft occasionally to 12 ft Friday.

MICHIGAN SOUTH 12120 12130 13236 11246. Chance of rain showers
early this evening. Waves 3 to 5 ft subsiding to 2 to 4 ft, then
building to 3 to 5 ft tonight. Waves 4 to 7 ft occasionally to 9
ft building to 5 to 8 ft occasionally to 10 ft Friday.

$$

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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