Great Lakes Forecast
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000
FZUS63 KLOT 210252
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Chicago/Romeoville IL
852 PM 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...A low pressure system of 29.8 inches in place over the
Upper Peninsula of Michigan and will lift into western Quebec by
late tonight. A 30.7 inch high will build across the northern
Great Plains 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.

LMZ261-362-364-366-563-565-567-669-868-870-211030-
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 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-
852 PM CST Tue Feb 20 2018

PORT WASHINGTON WI TO WHITEHALL MI NORTH...

.REST OF TONIGHT...West winds 15 to 25 kt becoming northwest to
30 kt. Chance of rain, light freezing rain and light sleet this
evening...then chance of light freezing rain and slight chance of
snow overnight. Waves 3 to 5 ft building to 4 to 7 ft occasionally
to 9 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt diminishing to 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 15 kt veering to east
10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY...East winds 10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Chance of light freezing rain, snow and light sleet overnight.
Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest. Rain, light
freezing rain, light sleet and snow likely in the morning. Waves
2 to 4 ft.
.FRIDAY NIGHT...West winds 10 to 20 kt becoming northwest. Waves
1 to 2 ft.
.SATURDAY...Northeast winds 10 to 15 kt becoming east 10 to
20 kt. Waves 1 to 3 ft building to 2 to 4 ft.
.SUNDAY...Northwest winds to 30 kt becoming west. Chance of rain
and snow. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-211030-
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-
852 PM CST Tue Feb 20 2018

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TONIGHT...West winds 15 to 25 kt becoming northwest to
30 kt overnight. Rain and slight chance of freezing rain this
evening...then rain with possible snow, sleet and freezing rain
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 5 to 8 ft occasionally to 10 ft subsiding to 3 to 6
ft occasionally to 8 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming northeast.
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 10 to
20 kt. Chance of rain and light freezing rain overnight. Waves
2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt becoming southwest 10 to 15 kt.
Rain likely in the morning. Waves 1 to 3 ft subsiding to 1 to
2 ft.
.FRIDAY NIGHT...West winds 10 to 20 kt becoming north. Waves 1 to
2 ft.
.SATURDAY...Northeast winds 10 to 20 kt becoming east. Waves 1 to
3 ft building to 2 to 4 ft.
.SUNDAY...West winds 15 to 25 kt increasing to 30 kt. Chance of
rain and snow. Waves 5 to 8 ft occasionally to 10 ft.

$$
LMZ761-211030-
MAFOR 2104/
MICHIGAN NORTH 11630 12740 11730 11720 13710. Waves 3 to 5 ft
building to 4 to 7 ft occasionally to 9 ft. overnight. Waves 4 to
7 ft occasionally to 9 ft subsiding to 2 to 4 ft Wednesday. Waves
1 to 3 ft Wednesday evening.

MICHIGAN SOUTH 10636 11736 12740 11730 11830 13820. Chance of
light rain late this evening, then rain with possible snow, sleet
and freezing rain overnight. Waves 3 to 5 ft building to 4 to 7
ft occasionally to 9 ft overnight. Waves 5 to 8 ft occasionally to
10 ft subsiding to 3 to 6 ft occasionally to 8 ft Wednesday.
Waves 3 to 5 ft subsiding to 2 to 4 ft Wednesday evening.

$$


KJB

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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