Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
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

000
FZUS63 KMQT 242100
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EST Fri Nov 24 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...A 29.2 inch low over northern Ontario is dragging a
trough averaging 29.3 inches across Lake Superior through this
evening, but it will move to Central Quebec by Saturday. The
region will then be dominated by a strengthening high of 30.1
inches passing through the central United States Saturday through
Sunday morning. A weak 29.9 inch trough will briefly affect Lake
Superior Sunday, followed by a 30.1 inch ridge overnight. A
developing low pressure system of 29.2 inches will then push
through Manitoba and Ontario and impact the region late Monday
night and into Tuesday. Ridging of 30.2 inches returns to the
Upper Great Lakes on Wednesday.

LSZ162-250500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EST Fri Nov 24 2017 /300 PM CST Fri Nov 24 2017/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Isolated
showers. Waves 2 to 4 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest by
midnight. Isolated rain and snow showers after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots late. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest. Waves
building to 1 to 3 feet.

$$

LSZ263-250500-
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-
400 PM EST Fri Nov 24 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Scattered rain
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest by
midnight. Isolated rain showers. Isolated snow showers after
midnight. Waves building to 5 to 9 feet occasionally to 11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west by
midnight, then becoming southwest 15 to 25 knots late. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.TUESDAY...West winds 20 to 30 knots veering northwest. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-250500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EST Fri Nov 24 2017

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Scattered
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Isolated rain showers.
Isolated snow showers after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots becoming west
5 to 15 knots by midnight, then increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ265-250500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EST Fri Nov 24 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Numerous
showers. Waves 1 to 3 feet.
.TONIGHT...West winds 20 to 30 knots becoming northwest gales to
35 knots by midnight. Scattered rain showers. Scattered snow
showers after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts. Isolated snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots by midnight, then increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West gales to 35 knots veering northwest. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ266-250500-
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-
400 PM EST Fri Nov 24 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Showers. Waves
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots late tonight. Scattered rain showers. Isolated
snow showers after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots. Scattered snow showers. Waves subsiding to 6
to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots by midnight, then backing west late. A slight
chance of snow showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 20 to 30 knots veering northwest in the
afternoon. A slight chance of snow showers in the morning. A
slight chance of rain showers. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...South gales to 35 knots becoming southwest 20 to
30 knots after midnight. A chance of rain showers. Waves building
to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 35 knots veering northwest. Waves
subsiding to 4 to 7 feet occasionally to 9 feet, then building to
9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ267-250500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EST Fri Nov 24 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Numerous
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 20 to 30
knots by midnight with a few gale force gusts to 35 knots.
Scattered rain showers. Scattered snow showers after midnight.
Waves subsiding to 2 to 4 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots. Scattered rain showers in the morning.
Scattered snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots by midnight, then backing west late. A slight
chance of snow showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 20 to 30 knots becoming northwest gales
to 35 knots in the afternoon. A slight chance of rain and snow
showers. Waves building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.MONDAY NIGHT...South gales to 35 knots. A chance of rain
showers. Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ261-250500-
MAFOR 2422/
Superior West 11630 14740 11740 12730. Scattered rain showers
early this evening. Waves 3 to 7 feet subsiding to 2 to 4 feet
Saturday.

Superior North Central 11630 15740 11740. Scattered rain showers
early this evening. Waves 5 to 9 feet subsiding to 4 to 7 feet
Saturday.

Superior South Central 11636 11740 12740 14740. Scattered rain
showers through early evening then scattered rain and snow
showers late tonight through mid Saturday morning. Scattered snow
showers late Saturday morning. Waves 1 to 3 feet building to 5 to
10 feet tonight and Saturday.

Superior East 11626 11630 15740. Scattered rain showers late this
evening then scattered snow showers late tonight. Scattered snow
and rain showers early Saturday morning through mid Saturday
morning. Scattered snow showers late Saturday morning. Waves 3 to
5 feet building to 8 to 11 feet tonight. Waves 7 to 11 feet
subsiding to 6 to 9 feet Saturday.

$$

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.