Great Lakes Forecast
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862
FZUS63 KLOT 151438
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
938 AM CDT Sun Apr 15 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 over southern Indiana
will gradually deepen to 29.4 inches while lifting across the
eastern Great Lakes tonight and Monday. The low will continue to
lift into southern Quebec Tuesday morning. Meanwhile, high
pressure of 30.8 inches centered over Northern Ontario will drift
to northern Quebec by this evening. A ridge of high pressure
averaging 30.4 inches will build into the Northern and Central
Plains today and then spread to the Middle and Upper Mississippi
Valley Monday night into Tuesday. Low pressure will develop across
the central Plains on Tuesday, and then track to the southern
Great Lakes Wednesday.

LMZ261-362-364-366-563-565-152115-
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-
938 AM CDT Sun Apr 15 2018

TWO RIVERS WI TO MANISTEE MI NORTH...

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...Northeast gales to 45 kt diminishing to gales to
40 kt. Snow and freezing rain. Waves 12 to 16 ft occasionally to
21 ft.
.TONIGHT...Northeast gales to 40 kt diminishing to 30 kt. Snow
with possible sleet with rain and freezing rain likely in the
evening, then snow likely with slight chance of freezing rain
overnight. Waves 10 to 14 ft occasionally to 18 ft subsiding to
8 to 11 ft occasionally to 14 ft.
.MONDAY...North winds to 30 kt becoming northwest. Snow likely.
Waves 6 to 9 ft occasionally to 12 ft.
.MONDAY NIGHT...Northwest winds to 30 kt. Chance of snow. Waves
5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds to 30 kt diminishing to 10 to 20 kt in
the afternoon. Chance of snow in the morning. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt increasing to 15 to
25 kt. Chance of rain. Waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft.
.THURSDAY...North winds to 30 kt diminishing to 15 to 25 kt.
Waves 6 to 9 ft occasionally to 12 ft.

$$

LMZ567-669-868-870-152115-
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-
938 AM CDT Sun Apr 15 2018

TWO RIVERS WI TO MANISTEE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI...

...GALE WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.REST OF TODAY...Northeast gales to 35 kt. Snow, freezing rain
and rain through mid morning, then snow and slight chance of
freezing rain this afternoon. Waves 10 to 14 ft occasionally to 18
ft subsiding to 8 to 11 ft occasionally to 14 ft.
.TONIGHT...Northeast winds to 30 kt becoming north. Rain with
possible snow, sleet and freezing rain likely in the evening,
then chance of rain, snow, light sleet and light freezing rain
likely overnight. Waves 8 to 11 ft occasionally to 14 ft
subsiding to 6 to 9 ft occasionally to 12 ft.
.MONDAY...North winds to 30 kt becoming northwest. Chance of
snow. Waves 7 to 10 ft occasionally to 13 ft.
.MONDAY NIGHT...Northwest winds to 30 kt. Chance of snow. Waves
5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of snow in the morning. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft.
.TUESDAY NIGHT...North winds 10 to 15 kt becoming northeast.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.WEDNESDAY...East winds 15 to 25 kt. Rain likely with a chance of
light freezing rain. Waves 1 to 3 ft building to 3 to 5 ft.
.THURSDAY...North winds 15 to 25 kt. Chance of rain and snow.
Waves 6 to 9 ft occasionally to 12 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-152115-
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-
938 AM CDT Sun Apr 15 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TODAY...Northeast winds to 30 kt, then becoming north 15
to 25 kt late. Rain and slight chance of freezing rain through
mid morning, then chance of rain with possible snow and freezing
rain likely this afternoon. Waves 8 to 11 ft occasionally to 14 ft
subsiding to 6 to 9 ft occasionally to 12 ft.
.TONIGHT...North winds 15 to 25 kt becoming northwest to 30 kt.
Chance of rain, snow, light sleet and slight chance of light
freezing rain in the evening, then rain likely, chance of snow,
light sleet and light freezing rain overnight. Waves 6 to 9 ft
occasionally to 12 ft.
.MONDAY...Northwest winds to 30 kt. Chance of snow and rain
likely in the morning, then chance of rain and snow in the
afternoon. Waves 7 to 10 ft occasionally to 13 ft.
.MONDAY NIGHT...Northwest winds to 30 kt. Chance of snow. Waves
6 to 9 ft occasionally to 12 ft.
.TUESDAY...Northwest winds to 30 kt diminishing to 10 to 20 kt in
the afternoon. Chance of snow in the morning. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.TUESDAY NIGHT...North winds 10 to 15 kt becoming northeast 10 to
20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...East winds to 30 kt. Chance of rain. Waves 3 to
5 ft.
.THURSDAY...North winds 15 to 25 kt. Waves 5 to 8 ft occasionally
to 10 ft.

$$
LMZ761-152115-
MAFOR 1515 AMD/
MICHIGAN NORTH...GALE WARNING IN EFFECT...14157 11157 12147
11847. Waves 14 to 18 ft occasionally to 23 ft subsiding to 12 to
16 ft occasionally to 21 ft this afternoon. Waves 10 to 14 ft
occasionally to 18 ft subsiding to 8 to 11 ft occasionally to 14
ft tonight. Waves 7 to 10 ft occasionally to 13 ft Monday
morning.

MICHIGAN SOUTH...GALE WARNING IN EFFECT...12157 11847 11840 11837
11730 11746 11740. Chance of rain this afternoon. Chance of rain
and snow late, then chance of snow and rain late this evening.
Chance of snow Monday morning. Waves 10 to 14 ft occasionally to
18 ft subsiding to 8 to 11 ft occasionally to 14 ft this
afternoon. Waves 7 to 10 ft occasionally to 13 ft tonight and
Monday morning.

$$

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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