Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
105
FZUS63 KMQT 212004
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
404 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.

LSZ162-220415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
404 PM EDT Mon Aug 21 2017 /304 PM CDT Mon Aug 21 2017/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northwest after
midnight, then increasing to 10 to 20 knots late. Isolated
showers through midnight. 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.

$$

LSZ263-220415-
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-
404 PM EDT Mon Aug 21 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight, then becoming northwest 10 to 20 knots late. Isolated
showers through 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.

$$

LSZ264-220415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
404 PM EDT Mon Aug 21 2017

.LATE THIS AFTERNOON...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...Northeast winds less than 10 knots backing north after
midnight, then becoming northwest 5 to 15 knots late. Isolated
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. Isolated sho
LSZ261-220415-
MAFOR 2121/
Superior West 13100 11710 12730 12630. Waves 1 foot or less
tonight. Waves 1 to 4 feet Tuesday.

Superior North Central 11200 12100 11800 11710 11720 11730 11630.
Waves 1 to 3 feet.

Superior South Central 12200 11116 11810 11720 11730 12740.
Scattered showers early this evening through the overnight.
Waves 1 to 4 feet.

Superior East 12200 11100 11116 11820 11720 11730 11640.
Scattered showers late this evening through mid Tuesday morning.
Waves around 1 foot tonight. Waves 1 to 3 feet building to 3 to 5
feet Tuesday.

$$

JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
wers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves su
LSZ261-220415-
MAFOR 2121/
Superior West 13100 11710 12730 12630. Waves 1 foot or less
tonight. Waves 1 to 4 feet Tuesday.

Superior North Central 11200 12100 11800 11710 11720 11730 11630.
Waves 1 to 3 feet.

Superior South Central 12200 11116 11810 11720 11730 12740.
Scattered showers early this evening through the overnight.
Waves 1 to 4 feet.

Superior East 12200 11100 11116 11820 11720 11730 11640.
Scattered showers late this evening through mid Tuesday morning.
Waves around 1 foot tonight. Waves 1 to 3 feet building to 3 to 5
feet Tuesday.

$$

JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
bsiding to 2 to 4 feet,
then 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 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...South winds less than 10 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves building to 1 to
3 feet.

$$

LSZ265-220415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
404 PM EDT Mon Aug 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight, then 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.

$$

LSZ266-220415-
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-
404 PM EDT Mon Aug 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then becoming north 10 to 20 knots 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...South
LSZ261-220415-
MAFOR 2121/
Superior West 13100 11710 12730 12630. Waves 1 foot or less
tonight. Waves 1 to 4 feet Tuesday.

Superior North Central 11200 12100 11800 11710 11720 11730 11630.
Waves 1 to 3 feet.

Superior South Central 12200 11116 11810 11720 11730 12740.
Scattered showers early this evening through the overnight.
Waves 1 to 4 feet.

Superior East 12200 11100 11116 11820 11720 11730 11640.
Scattered showers late this evening through mid Tuesday morning.
Waves around 1 foot tonight. Waves 1 to 3 feet building to 3 to 5
feet Tuesday.

$$

JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
east winds 10 to 20 knots. Waves building to
1 to 3 feet.

$$

LSZ267-220415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
404 PM EDT Mon Aug 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight, then 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.

$$

LSZ261-220415-
MAFOR 2121/
Superior West 131
LSZ261-220415-
MAFOR 2121/
Superior West 13100 11710 12730 12630. Waves 1 foot or less
tonight. Waves 1 to 4 feet Tuesday.

Superior North Central 11200 12100 11800 11710 11720 11730 11630.
Waves 1 to 3 feet.

Superior South Central 12200 11116 11810 11720 11730 12740.
Scattered showers early this evening through the overnight.
Waves 1 to 4 feet.

Superior East 12200 11100 11116 11820 11720 11730 11640.
Scattered showers late this evening through mid Tuesday morning.
Waves around 1 foot tonight. Waves 1 to 3 feet building to 3 to 5
feet Tuesday.

$$

JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
00 11710 12730 12630. Waves 1 foot or less
tonight. Waves 1 to 4 feet Tuesday.

Superior North Central 11200 12100 11800 11710 11720 11730 11630.
Waves 1 to 4 feet.

Superior South Central 12200 11116 11810 11720 11730 12740.
Scattered showers early this evening through the overnight.
Waves 1 to 4 feet.

Superior East 12200 11100 11116 11820 11720 11730 11640.
Scattered showers late this evening through mid Tuesday morning.
Waves around 1 foot tonight. Waves 1 to 3 feet building to 3 to 5
feet Tuesday.

$$

JSS

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

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



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.