Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Text Only | 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
574
FZUS63 KMQT 230845
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
345 AM EST Thu Nov 23 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 weak high of 30.0 over northern Ontario will extend
southward before yet another low of 29.9 inches brushes past the
upper Great Lakes on Friday. The region will then be dominated by
a strengthening high of 30.1 inches passing through the central
United States Saturday through much of the day Monday. A
developing low pressure system of 29.1 inches will then impact
the region Monday night.

LSZ162-231645-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
345 AM EST Thu Nov 23 2017 /245 AM CST Thu Nov 23 2017/

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by late morning, then backing southwest by mid afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. A slight chance of
rain and snow showers after midnight. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming southeast 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. Waves building to 1 to 3 feet.

$$

LSZ263-231645-
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-
345 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE FRIDAY
NIGHT...

.EARLY THIS MORNING...West winds 15 to 25 knots. Isolated snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. Frequent gale force gusts to 35 knots late. Isolated
rain showers after midnight. Waves subsiding to calm to 2 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of rain showers in the morning, then rain
showers likely in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots veering northwest after
midnight. Frequent gale force gusts to 35 knots. A slight chance
of rain and snow showers after midnight. Waves subsiding to 5 to 8
feet occasionally to 10 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming southeast 5 to
15 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering west. Waves building
to 2 to 4 feet.

$$

LSZ264-231645-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
345 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE FRIDAY
NIGHT...

.EARLY THIS MORNING...West winds 15 to 25 knots. Isolated snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
by midnight, then becoming southwest gales to 35 knots late.
Isolated snow showers in the evening. Isolated rain showers. Waves
subsiding to calm to 2 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of rain showers in the morning, then rain
showers likely in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest 20 to
30 knots late. A slight chance of rain showers. A slight chance
of snow showers after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming east 5 to 15 knots.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. A chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-231645-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
345 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.EARLY THIS MORNING...West winds 15 to 25 knots. Isolated snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then becoming southwest gales to 35 knots
late. Isolated rain showers after midnight. Waves subsiding to
calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest gales to 35 knots becoming west gales to 35
knots by mid afternoon. A slight chance of rain showers in the
morning, then rain showers likely in the afternoon. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4
feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest 20 to 30
knots late. A chance of rain showers. A chance of snow showers
after midnight. Waves building to 5 to 8 feet occasionally to 10
feet.
.SATURDAY...Northwest winds 20 to 30 knots. A few gale force gusts
to 35 knots. A chance of rain showers in the morning. A chance of
snow showers. Waves subsiding to 3 to 6 feet occasionally to 8
feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ266-231645-
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-
345 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.EARLY THIS MORNING...West winds 15 to 25 knots. Isolated snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Isolated snow showers. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then increasing to gales to 20 to 30 knots
late. Isolated rain showers, possibly mixed with snow. Waves
subsiding to 1 to 3 feet, then building to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY...South gales to 35 knots becoming west gales to 35 knots
by mid afternoon. A chance of rain showers in the morning, then
rain showers in the afternoon. Waves building to 5 to 9 feet
occasionally to 11 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight 20 to 30 knots late. A chance of rain showers. A chance
of snow showers after midnight. Waves building to 7 to 11 feet
occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots. A few gale force gusts
to 35 knots. A chance of rain showers in the morning. A chance of
snow showers. Waves subsiding to 5 to 8 feet occasionally to 10
feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots veering north. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to calm to
2 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-231645-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
345 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.EARLY THIS MORNING...West winds 20 to 30 knots. Scattered snow
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Scattered snow showers, possibly mixed
with rain. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then increasing to 20 to 30 knots late.
Scattered snow showers. Scattered rain showers after midnight.
Waves subsiding to 1 to 3 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...South gales to 35 knots veering southwest. A chance of
rain showers in the morning, then rain showers in the afternoon.
Waves building to 4 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest 20 to 30
knots late. Rain showers likely in the evening, then a chance of
rain showers, possibly mixed with snow after midnight. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots. A few gale force gusts
to 35 knots. Snow showers, possibly mixed with rain in the
morning, then a chance of snow showers in the afternoon. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-231645-
MAFOR 2310/
Superior West 11630 12620 11610 11510 11520 11530 11540. Waves 1
to 6 feet.

Superior North Central 11640 12730 11720 11600 11510 11430 11530.
Waves 2 to 7 feet.

Superior South Central 13630 11730 11620 11510 12430. Waves 2 to
5 feet.

Superior East 13630 11730 11720 11610 11530 11440. Scattered snow
showers, possibly mixed with rain late this morning. Scattered
rain and snow showers tonight. Waves 3 to 7 feet.

$$

KEC

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.