Great Lakes Forecast
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FZUS63 KLOT 151946
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
246 PM CDT Sun Jul 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 29.5 inches is over Hudson Bay while
troughing averaging 30.0 inches extends across the upper and mid
Mississippi River Valley. The trough will shift across Lake
Michigan tonight into early Monday. High pressure of 30.3 inches
over Montana today will build across the Upper Midwest by
Tuesday. The high will shift east across the Great Lakes Wednesday
reaching the New England coast Thursday. A 29.8 inch low will
develop over the northern plains Wednesday and move across central
Lake Michigan Friday.

LMZ261-362-364-563-160345-
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 Rock Island Passage to Sturgeon Bay WI-
246 PM CDT Sun Jul 15 2018

STURGEON BAY WI TO POINT BETSIE MI NORTH...

...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM CDT MONDAY...

.TONIGHT...Variable winds around 10 kt late this afternoon
becoming south 10 to 15 kt by early evening then veering to
southwest 10 to 20 kt. Winds shifting to northwest 10 to 15 kt
late. Areas of fog this evening. Slight chance of showers and
thunderstorms this evening, then chance of showers and
thunderstorms overnight. Waves 1 to 3 ft.
.MONDAY...Northwest winds 10 to 15 kt becoming southwest. Slight
chance of showers and thunderstorms in the morning. Waves 1 to 3
ft.
.MONDAY NIGHT...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to
10 kt overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Northwest winds 5 to 10 kt becoming southwest. Waves
1 ft or less.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.FRIDAY...Southeast winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 3 to 5 ft.

$$

LMZ366-565-567-669-868-870-160345-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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-
246 PM CDT Sun Jul 15 2018

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI...

.TONIGHT...Variable winds around 10 kt late this afternoon
becoming south 10 to 15 kt by early evening then veering to west
late. Chance of showers and thunderstorms overnight. Waves 1 to 3
ft.
.MONDAY...North winds 10 to 20 kt becoming west 10 to 15 kt.
Slight chance of showers and thunderstorms in the morning. Waves 1
to 3 ft.
.MONDAY NIGHT...West winds 10 to 20 kt becoming north. Waves 1 to
3 ft building to 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft.
.TUESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to 5 to
10 kt overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Northeast winds 5 to 10 kt veering to south. Waves
1 to 2 ft.
.WEDNESDAY NIGHT...South winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 3 to 5 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-160345-
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-
246 PM CDT Sun Jul 15 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.TONIGHT...Variable winds around 10 kt becoming south this evening
and southwest 10 to 15 kt overnight. Slight chance of showers and
thunderstorms overnight. Waves 1 to 2 ft.
.MONDAY...West winds 10 to 15 kt veering to north 10 to 20 kt.
Chance of showers and thunderstorms in the morning, then slight
chance of showers and thunderstorms in the afternoon. Waves 1 to
3 ft.
.MONDAY NIGHT...Northwest winds 10 to 15 kt becoming north 10 to
20 kt. Waves 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northeast winds 15 to 25 kt diminishing to 10 to
15 kt overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft.
.WEDNESDAY...Northeast winds 5 to 10 kt increasing to 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers and thunderstorms. Waves 3 to 5 ft.

$$

LMZ761-160345-
MAFOR 1521/
MICHIGAN NORTH 11904 11414 12524 12710 11610 11510. Chance of
showers and thunderstorms overnight and Monday morning. Waves 1
to 3 ft.

MICHIGAN CENTRAL 11900 11410 12510 11610 12820 11810. Chance of
showers and thunderstorms overnight. Waves 1 to 3 ft.

MICHIGAN SOUTH 11900 12400 12510 11610 12820. Chance of showers
and thunderstorms Monday morning. Waves 1 to 3 ft.

$$

BMD

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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