Great Lakes Forecast
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000
FZUS63 KMQT 140304
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1004 PM 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...The region is currently dominated by a high pressure
system of 30.8 inches located along the Eastern seaboard that
will slowly drift eastward overnight. A quick moving trough of
29.6 inches will sweep through the Upper Great Lakes Wednesday
night. On Thursday, a 30.1 inch ridge will move over the Upper
Great Lakes and build to 30.3 inches on Friday, associated with a
30.5 inch high over the central Plains. That high will shift to
the northeastern U.S. Saturday, and a 29.8 inch trough will track
across the Upper Great Lakes in the afternoon and evening. Brief
ridging of 30.1 inches will pass through the area on Sunday.

LSZ162-141115-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1004 PM EST Tue Feb 13 2018 /904 PM CST Tue Feb 13 2018/

.REST OF TONIGHT...Southwest winds 20 to 30 knots with a few gale
force gusts to 35 knots diminishing to 15 to 25 knots late.
Patchy blowing snow.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Patchy blowing snow in the morning.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
late. A chance of snow showers and a slight chance of freezing
drizzle after midnight.
.THURSDAY...West winds 5 to 15 knots veering northeast in the
afternoon. A chance of snow showers and a slight chance of
freezing drizzle in the morning.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers.
.FRIDAY...West winds 10 to 20 knots.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of snow showers.
.SUNDAY...Southeast winds 5 to 15 knots backing north. A chance
of snow showers, then snow showers likely.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-141115-
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-
1004 PM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT UNTIL 7 AM EST WEDNESDAY...

.REST OF TONIGHT...Southwest gales to 35 knots diminishing to
20 to 30 knots late. Patchy blowing snow.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Patchy blowing snow.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west by
midnight. A chance of snow showers and a slight chance of
freezing drizzle after midnight.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of snow showers and a slight
chance of freezing drizzle in the morning.
.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.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of snow showers.
.SUNDAY...Southeast winds 10 to 20 knots becoming north 5 to
15 knots. Snow showers likely.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-141115-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1004 PM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT UNTIL 7 AM EST WEDNESDAY...

.REST OF TONIGHT...Southwest gales to 35 knots diminishing to 20
to 30 knots late. Patchy blowing snow.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots. Patchy blowing snow.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west by
midnight. A chance of snow showers and a slight chance of
freezing drizzle after midnight.
.THURSDAY...North winds 10 to 20 knots. A chance of snow showers
and a slight chance of freezing drizzle in the morning.
.THURSDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow showers.
.FRIDAY...West winds 10 to 20 knots.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of snow showers.
.SUNDAY...Southeast winds 10 to 20 knots becoming northwest 15 to
25 knots. Snow showers likely.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-141115-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1004 PM EST Tue Feb 13 2018

.REST OF TONIGHT...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering west late.
A chance of freezing drizzle and snow showers after midnight.
.THURSDAY...Northwest winds 10 to 20 knots veering north in the
afternoon. A chance of freezing drizzle in the morning. A chance
of snow showers.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers.
.FRIDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of snow showers.
.SUNDAY...Southeast winds 15 to 25 knots veering south. Snow
showers likely.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-141115-
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-
1004 PM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT UNTIL 1 AM EST WEDNESDAY...

.REST OF TONIGHT...South gales to 35 knots becoming southwest by
midnight. Waves 7 to 10 feet occasionally to 13 feet subsiding to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming south 15 to
25 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots by midnight, then veering west late. A chance of
snow showers, a slight chance of drizzle and freezing drizzle
after midnight. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.THURSDAY...West winds 15 to 25 knots veering north in the
afternoon. A chance of snow showers and a slight chance of
freezing drizzle. 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. Heavy freezing spray. A chance of
snow showers. Waves building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. Heavy freezing spray. A chance of snow
showers. Waves building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of snow showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.SUNDAY...South winds 15 to 25 knots. Snow showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-141115-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1004 PM EST Tue Feb 13 2018

...GALE WARNING IN EFFECT UNTIL 1 AM EST WEDNESDAY...

.REST OF TONIGHT...South gales to 35 knots becoming southwest by
midnight, then diminishing to 15 to 25 knots late. Waves 6 to 9
feet occasionally to 11 feet subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots veering southwest
by midnight, then diminishing to 10 to 20 knots late. A slight
chance of drizzle and freezing drizzle after midnight. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest in the
afternoon. A chance of snow showers and freezing drizzle. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west in the
afternoon. Heavy freezing spray. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots backing south after
midnight. Freezing spray in the evening. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-141115-
MAFOR 1404/
Superior West...Gale Warning in effect...11550 12540 13530 12520.
Waves omitted for mostly ice covered areas.

Superior North Central...Gale Warning in effect...13550 11540
12530 11420 11510. Waves omitted for mostly ice covered areas.

Superior South Central...Gale Warning in effect...11540 19550
12530 14420 11420. Waves omitted for mostly ice covered areas.

Superior East...Gale Warning in effect...11550 11540 13530 12420
11430. Freezing spray late this evening. Waves 6 to 10 feet
overnight subsiding to 2 to 4 feet Wednesday.

$$

Borchardt

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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