Great Lakes Forecast
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000
FZUS63 KLOT 130758
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
258 AM CDT Fri Apr 13 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...A nearly stationary front will remain just south of
southern Lake Michigan through Saturday as 29.1 inch low pressure
currently over Kansas drifts to the middle Mississippi River Valley
and weakens to 29.7 inches. Meanwhile, 30.3 inch high pressure will
build across northern Ontario. The low will reach far southwest
Quebec at 29.3 inches by Tuesday morning. The high pressure over
Ontario will shift northeastward during this time, extending a 30.5
inch ridge across the Great Plains on Monday and the Upper
Mississippi River Valley by Tuesday morning.

LMZ261-362-364-366-563-565-567-669-868-870-131530-
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-
258 AM CDT Fri Apr 13 2018

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

...GALE WARNING IN EFFECT FROM LATE THIS AFTERNOON THROUGH SUNDAY
EVENING...

.TODAY...Northeast winds 15 to 25 kt increasing to gales to
40 kt late. Rain showers, possibly mixed with snow. Isolated
thunderstorms. Waves 3 to 5 ft building to 7 to 10 ft
occasionally to 13 ft.
.TONIGHT...Northeast gales to 40 kt increasing to gales to 45 kt
late. Rain and snow showers. Waves 10 to 14 ft occasionally to 18
ft.
.SATURDAY...Northeast gales to 45 kt decreasing to gales to 40 kt
in the afternoon. A few storm force gusts to 50 kt in the morning.
Rain and snow showers with sleet likely in the morning, then
chance of snow showers, sleet and rain showers in the afternoon.
Waves 10 to 14 ft occasionally to 18 ft subsiding to 8 to 12 ft
occasionally to 16 ft.
.SATURDAY NIGHT...Northeast gales to 45 kt. Sleet and rain likely
with a chance of snow in the evening, then sleet and snow
overnight. Waves 8 to 12 ft occasionally to 16 ft.
.SUNDAY...Northeast gales to 40 kt diminishing to gales to 35 kt.
Snow and sleet in the morning, then snow and sleet in the
afternoon. Waves 8 to 12 ft occasionally to 16 ft.
.SUNDAY NIGHT...Northeast winds to 30 kt backing north after
midnight. A few gale force gusts to 35 kt. Snow likely with a
chance of freezing rain. Waves 8 to 12 ft occasionally to 16 ft.
.MONDAY...North winds to 30 kt backing northwest. A few gale force
gusts to 35 kt. Chance of snow. Waves 8 to 12 ft occasionally to
16 ft.
.TUESDAY...Northwest winds to 30 kt becoming north 15 to 25 kt.
Chance of rain and snow. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 3 to 5 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-131530-
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-
258 AM CDT Fri Apr 13 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

...GALE WARNING IN EFFECT FROM OVERNIGHT TONIGHT THROUGH SUNDAY
MORNING...

.TODAY...East winds to 30 kt backing northeast in the afternoon.
Chance of rain showers and slight chance of thunderstorms. Waves 4
to 7 ft occasionally to 9 ft.
.TONIGHT...Northeast winds with gale force gusts to 35 kt
increasing to gales to 40 kt. Rain showers and slight chance of
thunderstorms. 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 becoming east. A few storm
force gusts to 50 kt in the morning. 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. Rain likely in the
evening, then rain and sleet overnight. Waves 8 to 11 ft
occasionally to 14 ft.
.SUNDAY...Northeast gales to 35 kt diminishing to 30 kt. Rain in
the morning, then rain and snow possibly mixed with sleet in the
afternoon. Waves 8 to 12 ft occasionally to 16 ft.
.SUNDAY NIGHT...North winds to 30 kt becoming northwest. Chance
of snow and rain. Waves 8 to 12 ft occasionally to 16 ft.
.MONDAY...Northwest winds to 30 kt with a few gale force gusts to
35 kt. Chance of snow and rain. 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.

$$

LMZ761-131530-
MAFOR 1309/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11230 11136 11146 11147
11157 11167 12157. Chance of rain showers early this morning.
Waves 3 to 5 ft building to 6 to 9 ft occasionally to 12 ft
today. Waves 10 to 14 ft occasionally to 18 ft tonight.

MICHIGAN SOUTH...GALE WARNING IN EFFECT...12240 11246 11146 11156
11166 12156. Chance of rain showers early this morning. Waves 4
to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally
to 12 ft today. Waves 10 to 14 ft occasionally to 18 ft tonight.

$$

Kluber

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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