Great Lakes Forecast
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FZUS63 KLOT 201346
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
846 AM CDT Tue Jun 20 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 at 29.4 inches over western Quebec will
continue to move off to the east this afternoon with a secondary
trough behind this low dropping south across the lake.
Meanwhile... an expansive high pressure area averaging 30.0
inches stretching across the plains to mid Mississippi Valley will
build east over the western Great Lakes tonight. As this high
continues to move east Wednesday... a 29.4 inch low will move from
Saskatchewan to Quebec through Friday afternoon. The low`s cold
front will swing across the lake Thursday night followed by a
secondary cold front Friday night.

LMZ261-362-364-366-563-565-202145-
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-
846 AM CDT Tue Jun 20 2017

TWO RIVERS WI TO MANISTEE MI NORTH...

.REST OF TODAY...West winds 10 to 20 kt becoming southwest.
Scattered showers and isolated thunderstorms. Waves 1 to 3 ft.
.TONIGHT...Southwest winds 5 to 10 kt becoming west late. Waves 1
to 2 ft.
.WEDNESDAY...West winds less than 10 kt becoming southwest late
in the morning...then becoming south 10 to 15 kt early in the
afternoon. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...South winds 10 to 20 kt. Showers and
thunderstorms likely overnight. Waves 1 to 2 ft building to 1 to
3 ft.
.THURSDAY...South winds 10 to 20 kt becoming southwest. Chance of
showers and thunderstorms in the morning. Waves 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt becoming west.
Waves 1 to 3 ft.
.FRIDAY...West winds 10 to 20 kt. Waves 1 to 3 ft.
.SATURDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ567-669-671-673-675-868-870-872-874-876-202145-
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 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 Pentwater to Manistee MI 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-
846 AM CDT Tue Jun 20 2017

TWO RIVERS WI TO MANISTEE MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...

.REST OF TODAY...West winds 10 to 20 kt becoming southwest.
Scattered showers and thunderstorms. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 10 to 15 kt becoming west 5 to 10 kt
late. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.WEDNESDAY...Northwest winds less than 10 kt becoming variable
late in the morning...then becoming south 10 to 15 kt late. Waves
1 ft or less.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 kt becoming south
10 to 20 kt. Showers and thunderstorms likely overnight. Waves
1 to 2 ft building to 2 to 4 ft.
.THURSDAY...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Showers and thunderstorms likely in the morning...then
chance of showers and thunderstorms in the afternoon. Waves 3 to
5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt becoming west 10 to
20 kt. Showers and thunderstorms likely. Waves 1 to 3 ft.
.FRIDAY...West winds 10 to 15 kt becoming northwest. Waves 1 to 2
ft.
.SATURDAY...North winds 10 to 20 kt. Waves 1 to 2 ft.

$$

LMZ080-777-779-878-202145-
Lake Michigan from Michigan City IN to St. Joseph MI 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 St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
846 AM CDT Tue Jun 20 2017

WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...

.REST OF TODAY...West winds 10 to 20 kt becoming east. Scattered
showers and thunderstorms. Waves 2 to 4 ft.
.TONIGHT...South winds 10 to 15 kt backing to northeast 5 to 10 kt.
Waves 1 to 3 ft subsiding to 1 to 2 ft.
.WEDNESDAY...Northeast winds less than 10 kt increasing to 5 to
10 kt. Waves 1 ft or less.
.WEDNESDAY NIGHT...East winds around 10 kt becoming south 10 to
20 kt. Chance of showers and thunderstorms overnight. Waves 1 ft
or less building to 1 to 3 ft.
.THURSDAY...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of showers and thunderstorms. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt. Showers and
thunderstorms likely. Waves 1 to 2 ft.
.FRIDAY...West winds 10 to 15 kt becoming northwest. Chance of
showers and thunderstorms. Waves 1 to 2 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 1 to 3 ft.

$$
LMZ761-202145-
MAFOR 2015/
MICHIGAN NORTH 12620 11520 11510 12500 12600. Chance of showers
and thunderstorms late this morning,...Then chance of showers
today. Waves 1 to 3 feet.

MICHIGAN SOUTH 12620 11520 11510 11410 11500 11700 11800. Chance
of showers and thunderstorms today. Waves 2 to 4 feet subsiding
to 1 foot or less today and tonight. Waves 1 foot or less
Wednesday morning.

$$

Ed F

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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