Great Lakes Forecast
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FZUS63 KLOT 200848
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
248 AM CST Tue Feb 20 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...An elongated trough averaging 29.9 inches stretches
from Oklahoma across the middle of Lake Michigan then to New
England. Within the trough, a low of 29.8 inches is in place over
southeastern Wisconsin and will lift across Lake Michigan through
the day today then lift into western Quebec by late tonight. A
trailing cold front will push across Lake Michigan clearing the
lake by late tonight. A 30.7 inch high will build across the
northern Great Plains today and tonight and eventually shift to
the western Great Lakes Wednesday night. The high will continue
east to New England Friday. A weak low of 30.1 inches will lift
from the lower Mississippi Valley Thursday night to the eastern
Great Lakes Friday. Another high of 30.3 inches will build across
the Upper Midwest Friday and move to Quebec Saturday. Low pressure
of 29.7 inches will develop over the Central Plains Saturday and
lift to Lake Michigan early Sunday deepening to 29.5 inches.

LMZ261-362-364-563-201630-
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-
248 AM CST Tue Feb 20 2018

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.TODAY...East winds 15 to 25 kt becoming southeast 15 to 20 kt
late this morning...then becoming southwest 10 to 20 kt this
afternoon. Patchy fog. Rain showers. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 2 to 4 ft.
.TONIGHT...West winds 10 to 20 kt becoming northwest 15 to 25 kt.
Patchy fog in the evening. Chance of rain and slight chance of
light freezing rain in the evening. Waves 2 to 4 ft building to
3 to 5 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming west 5 to
10 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...West winds 5 to 10 kt backing to east. Waves
1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 3 ft.
.THURSDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Chance of snow and light freezing rain. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 15 kt becoming southwest. Snow,
freezing rain and sleet likely. Waves 1 to 3 ft.
.SATURDAY...Northeast winds 10 to 15 kt becoming east 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.

$$

LMZ366-565-567-669-868-870-201630-
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-
248 AM CST Tue Feb 20 2018

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

.TODAY...Variable winds 10 to 15 kt becoming southwest 10 to 20
kt.. Patchy fog. Rain showers likely. Waves 2 to 4 ft.
.TONIGHT...West winds 10 to 20 kt becoming northwest 15 to 25 kt
late in the evening...then increasing to 30 kt after midnight.
Patchy fog in the evening. Chance of rain and slight chance of
light freezing rain in the evening...then slight chance of light
freezing rain overnight. Waves 2 to 4 ft building to 4 to 7 ft
occasionally to 9 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...North winds 5 to 10 kt becoming northeast
10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.THURSDAY NIGHT...Southeast winds 15 to 25 kt. Chance of light
freezing rain and light sleet. Waves 3 to 5 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest 10 to 15 kt.
Rain, freezing rain, snow likely with a chance of sleet. Waves
2 to 4 ft.
.SATURDAY...Northeast winds 10 to 15 kt becoming east 10 to
20 kt. Chance of rain. Waves 1 to 3 ft building to 2 to 4 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-201630-
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-
248 AM CST Tue Feb 20 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 PM CST THIS EVENING...

.TODAY...Southwest winds 15 to 25 kt. Areas of dense fog. Rain
showers and slight chance of thunderstorms. Waves 3 to 5 ft.
.TONIGHT...West winds 10 to 20 kt becoming northwest 15 to 25 kt
late in the evening...then increasing to 30 kt after midnight.
Areas of dense fog in the evening. Rain with a chance of light
freezing rain in the evening...then rain likely with possible
freezing rain, sleet and snow overnight. Waves 3 to 5 ft building
to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming north 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.WEDNESDAY NIGHT...North winds 10 to 15 kt becoming northeast
10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY...East winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...East winds 15 to 25 kt becoming southeast.
Chance of rain and light freezing rain. Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 15 kt becoming west. Rain likely.
Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SATURDAY...Northeast winds 10 to 20 kt becoming east. Chance of
rain and snow. Waves 1 to 3 ft building to 2 to 4 ft.

$$

LMZ761-201630-
MAFOR 2010/
MICHIGAN NORTH 12236 11326 12526 11620 12730. Patchy fog through
this evening. Chance of rain this evening. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft today. Waves 2 to 4 ft
building to 3 to 5 ft tonight.

MICHIGAN CENTRAL 12916 11416 11526 11520 11620 11730 11740. Patchy
fog through this evening. Chance of rain this evening. Waves 2 to
4 ft today. Waves 2 to 4 ft building to 4 to 7 ft occasionally to
9 ft tonight.

MICHIGAN SOUTH 14534 19536 11534 19536 11626 19624 11736 11746.
Chance of light freezing rain in the evening and chance of a
wintry mix overnight. Waves 3 to 5 ft today. Waves 3 to 5 ft
building to 4 to 7 ft occasionally to 9 ft tonight.

$$

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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