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
000
FZUS63 KMQT 131450
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
950 AM EST Tue Feb 13 2018

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 30.8 inch high pressure ridge over the Lower Great
Lakes will continue east across New England today. Pressure will
decrease over Lake Superior ahead of a quick moving trough of
29.6 inches that will sweep through the Upper Great Lakes on
Wednesday night. On Thursday, a 30.1 inch ridge will move across
the Upper Great Lakes and build to 30.3 inches on Friday. A 29.8
inch trough will track across the Upper Great Lakes on Saturday.

LSZ162-132300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
950 AM EST Tue Feb 13 2018 /850 AM CST Tue Feb 13 2018/

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
20 to 30 knots. Scattered snow showers late in the morning.
.TONIGHT...Southwest winds 20 to 30 knots with a few gale force
gusts to 35 knots.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Patchy blowing snow in the morning.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. A chance of snow
showers and freezing drizzle after midnight.
.THURSDAY...Northeast winds 5 to 15 knots. A chance of snow
showers.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight.
.FRIDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots.
.SATURDAY...West winds 15 to 25 knots becoming southwest 5 to
15 knots. Patchy blowing snow. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-132300-
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-
950 AM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
WEDNESDAY MORNING...

.REST OF TODAY...South winds 10 to 20 knots becoming southwest
20 to 30 knots. Scattered snow showers late in the morning.
.TONIGHT...Southwest gales to 35 knots.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots. Patchy blowing snow in the morning.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. A chance of snow
showers and freezing drizzle after midnight.
.THURSDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of snow showers.
.THURSDAY NIGHT...North winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. A chance of snow showers.
.FRIDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots.
.SATURDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Patchy blowing snow. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-132300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
950 AM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
WEDNESDAY MORNING...

.REST OF TODAY...South winds 10 to 20 knots becoming southwest
20 to 30 knots. Scattered snow showers.
.TONIGHT...Southwest gales to 35 knots.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots. Patchy blowing snow in the morning.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. A chance of snow showers and a slight
chance of freezing drizzle after midnight.
.THURSDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Patchy blowing snow. A chance of snow
showers.
.THURSDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow showers.
.FRIDAY...West winds 15 to 25 knots backing southwest. Patchy
blowing snow.
.SATURDAY...West winds 15 to 25 knots backing southwest. Patchy
blowing snow. A chance of snow showers, then snow showers likely.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-132300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
950 AM EST Tue Feb 13 2018

.REST OF TODAY...South winds 5 to 15 knots increasing to 15 to
25 knots. Scattered snow showers.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots by midnight.
.WEDNESDAY...Southwest winds 10 to 20 knots backing south.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of freezing drizzle and snow showers
after midnight.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers in the
morning, then snow showers likely in the afternoon. Patchy
blowing snow in the afternoon.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Patchy blowing snow. Snow showers
likely in the evening. A chance of snow showers after midnight.
.FRIDAY...West winds 15 to 25 knots backing southwest.
.SATURDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-132300-
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-
950 AM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT FROM 3 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...South winds 15 to 25 knots increasing to gales
to 40 knots. Scattered snow showers. Freezing spray in the
afternoon. Waves 2 to 4 feet building to 6 to 9 feet occasionally
to 11 feet.
.TONIGHT...South gales to 35 knots veering southwest by midnight.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots backing south. Waves
4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A slight chance of drizzle,
freezing drizzle and snow showers after midnight. Waves 4 to
7 feet occasionally to 9 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Patchy blowing snow. A chance of snow
showers in the morning. Snow showers likely in the afternoon.
Waves 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Patchy blowing snow. Snow showers
likely. Waves 4 to 7 feet occasionally to 9 feet.
.FRIDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves building to 4 to 8 feet occasionally to
10 feet.
.SATURDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 4 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-132300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
950 AM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT FROM 3 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...South winds 15 to 25 knots increasing to gales
to 35 knots. Scattered snow showers. Freezing spray in the
afternoon. Waves 2 to 4 feet building to 6 to 9 feet occasionally
to 11 feet.
.TONIGHT...South gales to 35 knots veering southwest by midnight,
then diminishing to 15 to 25 knots late. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots backing south. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots becoming west 10 to
20 knots after midnight. A slight chance of drizzle, freezing
drizzle and snow showers after midnight. Waves subsiding to 1 to
3 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north in the
afternoon. A chance of snow showers in the morning, then snow
showers likely in the afternoon. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots. A chance of snow
showers in the evening, then snow showers likely after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 15 to 25 knots backing southwest. Heavy
freezing spray and patchy blowing snow. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-132300-
MAFOR 1316/
Superior West...Gale Warning in effect...16540. Waves omitted for
mostly ice covered areas.

Superior North Central...Gale Warning in effect...11440 11550
11540 14550 11540. Scattered snow showers late this morning.
Waves omitted for mostly ice covered areas.

Superior South Central...Gale Warning in effect...11430 12440
11430 11530 12520 11510. Waves omitted for mostly ice covered
areas.

Superior East...Gale Warning in effect...11440 11450 11451 12550
11540 12530. Scattered snow showers this afternoon. Freezing
spray through early evening. Waves 3 to 5 feet building to 6 to 10
feet this afternoon, then subsiding to 4 to 7 feet late tonight.
Waves 3 to 6 feet Wednesday morning.

$$

KCW

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.