Great Lakes Forecast
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FZUS63 KMQT 220213 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
1012 PM EDT Mon Aug 21 2017

For waters beyond five nautical miles of shore on Lake Superior

Waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. Occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.SYNOPSIS...30.0 high pressure over northwestern Lake Superior
this evening will move across the Upper Great Lakes tonight. Low
pressure of 29.8 inches over the Central Plains will move through
northern Lake Huron by early Tuesday. A 30.2 inch high pressure
extending from Manitoba to Nebraska Tuesday night will move over
Wisconsin Thursday morning and remain over the Great Lakes through
Friday and into Saturday.

LSZ162-221015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1007 PM EDT Mon Aug 21 2017 /907 PM CDT Mon Aug 21 2017/

.REST OF TONIGHT...East winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then backing northwest late. Waves calm
to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then veering north late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-221015-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1007 PM EDT Mon Aug 21 2017

.REST OF TONIGHT...East winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then backing northwest late. Isolated
showers by midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. Isolated showers by mid afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
late. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds less than 10 knots. Waves calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-221015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1007 PM EDT Mon Aug 21 2017

.REST OF TONIGHT...East winds 5 to 15 knots backing north after
midnight, then backing northwest late. Isolated showers by
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming west 15 to 25
knots in the afternoon. A slight chance of showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north after
midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 5
feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 5 to 15
knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ265-221015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1007 PM EDT Mon Aug 21 2017

.REST OF TONIGHT...Northeast winds 10 to 20 knots backing
northwest late. Scattered showers and isolated thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then backing west late. Waves building
to 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-221015-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
1007 PM EDT Mon Aug 21 2017

.REST OF TONIGHT...Northeast winds 10 to 20 knots backing
northwest late. Scattered showers and isolated thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then backing west late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-221015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1007 PM EDT Mon Aug 21 2017

.REST OF TONIGHT...East winds 10 to 20 knots backing north late.
Numerous showers and isolated thunderstorms. Waves calm to
2 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then increasing to gales to 35 knots
late. Isolated showers through early afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$
LSZ261-221015-
MAFOR 2203/
Superior West 11120 11710 12730 13630 11720. Waves 1 foot or less
overnight. Waves 1 to 3 feet building to 2 to 4 feet Tuesday.
Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday evening.

Superior North Central 11100 11810 11710 11720 11730 12630 11720.
Waves 1 foot or less overnight. Waves 2 feet or less building to
2 to 4 feet Tuesday. Waves 2 to 4 feet Tuesday evening.

Superior South Central 11116 11810 11720 11730 12740 11630 11730.
Scattered showers overnight. Waves 1 foot or less overnight.
Waves 1 to 3 feet building to 2 to 4 feet Tuesday. Waves 2 to 4
feet Tuesday evening.

Superior East 11110 11816 11820 11720 11730 12640 11730.
Scattered showers late this evening. Scattered showers late
overnight. Scattered showers through mid morning Tuesday. Waves
around 1 foot overnight. Waves 1 to 3 feet building to 3 to 6
feet Tuesday. Waves 4 to 6 feet Tuesday evening.

$$

JLA

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes



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