Great Lakes Forecast
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813
FZUS63 KLOT 190748
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
248 AM CDT Sat Aug 19 2017

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 29.5 inches across western Quebec
will continue to pull away from the Great Lakes region today,
while weak high pressure of 29.9 inches moves over the southern
Great Lakes. This high will gradually move east late tonight into
Sunday while strengthening to 30.1 inches and expanding across the
Ohio Valley and Mid-Atlantic regions. A low pressure trough and
an associated cold front averaging 29.9 inches will slowly sink
southward over the northern part of the lake late Monday night
into Tuesday. As low pressure of 29.6 inches develops across the
eastern lakes Tuesday afternoon, the cold front will accelerate
down the lake. High pressure of 30.2 inches will then build over
the lake later next week.


LMZ261-362-364-366-563-565-567-868-191530-
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-
248 AM CDT Sat Aug 19 2017

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northwest winds 10 to 20 kt becoming west 10 to 15 kt
after sunrise, then southwest 10 to 20 kt by early afternoon.
Slight chance of showers this afternoon. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 10 to 20 kt diminishing to 10 to
15 kt after midnight. Slight chance of showers in the evening.
Waves subsiding to 1 to 3 ft by midnight.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt
by late morning, and increasing to 15 to 25 kt in the afternoon.
Waves building to 3 to 5 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt. Chance of showers
overnight. Waves 2 to 4 ft.
.MONDAY...Southwest winds 10 to 15 kt. Chance of showers. Waves
1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 15 kt becoming east. Chance of
showers. Waves 1 to 2 ft.
.TUESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of thunderstorms. Waves building to 3 to 5 ft.
.WEDNESDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-191530-
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-
248 AM CDT Sat Aug 19 2017

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northwest winds 10 to 20 kt diminishing to 10 to 15 kt
after sunrise, then backing to southwest in the afternoon. Waves
2 to 4 ft subsiding to 1 to 2 ft by early afternoon.
.TONIGHT...South winds 10 to 15 kt becoming southwest after
midnight. Waves 1 to 3 ft.
.SUNDAY...South winds 10 to 15 kt increasing to 10 to 20 kt by
early afternoon. Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers overnight. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 15 kt becoming south. Chance of
showers in the morning. Waves 1 to 3 ft.
.MONDAY NIGHT...Southwest winds 10 to 20 kt. Showers likely with
a chance of thunderstorms. Waves building to 2 to 4 ft.
.TUESDAY...West winds 10 to 20 kt becoming northwest 20 to 25 kt.
Showers likely with a chance of thunderstorms. Waves building to
4 to 6 ft occasionally to 8 ft in the afternoon.
.WEDNESDAY...North winds 15 to 20 kt. Waves 3 to 5 ft.

$$

LMZ761-191530-
MAFOR 1909/
MICHIGAN NORTH 11720 11610 11510 14520 11510. Waves 2 to 4 ft
today subsiding to 1 to 3 ft by midnight.

MICHIGAN SOUTH 11720 12720 11610 19900 11510 12410 11510. Waves 2
to 4 ft subsiding to 1 to 3 ft by early afternoon and continuing
tonight.

$$

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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