Great Lakes Forecast
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FZUS63 KMQT 250857
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM EST Sun Feb 25 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...Low pressure of 29.3 inches over western Upper Michigan
will deepen to 29.1 inches as it reaches James Bay this afternoon.
A high pressure ridge of 30.1 inches across the central Mississippi
River Valley today will build across the Ohio Valley at 30.3
inches on Monday. Meanwhile a 29.6 inch low crossing southern
Manitoba on Monday will weaken to 29.8 inches as it crosses
northern Ontario Tuesday. A 30.1 inch ridge arrives over the Upper
Great Lakes on Wednesday then on Thursday a 29.1 inch low will
track across the Great Lakes region.

LSZ162-251700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EST Sun Feb 25 2018 /257 AM CST Sun Feb 25 2018/

...GALE WARNING IN EFFECT FROM 9 AM EST /8 AM CST/ THIS MORNING
THROUGH THIS EVENING...

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Snow
likely.
.TODAY...West gales to 40 knots. A slight chance of snow in the
morning.
.TONIGHT...West winds 20 to 30 knots becoming southwest 15 to
25 knots by midnight, then diminishing to 10 to 20 knots late.
.MONDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon.
.MONDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight.
.TUESDAY...West winds 5 to 15 knots.
.TUESDAY NIGHT...West winds less than 10 knots veering north
after midnight.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-251700-
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-
357 AM EST Sun Feb 25 2018

...GALE WARNING IN EFFECT FROM 9 AM EST THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...Southeast winds 15 to 25 knots. Snow.
.TODAY...West gales to 45 knots. A few storm force gusts to 50
knots by late morning. A chance of snow in the morning.
.TONIGHT...West gales to 35 knots diminishing to 15 to 25 knots
by midnight, then becoming southwest 10 to 20 knots late.
.MONDAY...Southwest winds 10 to 20 knots.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon.
.TUESDAY NIGHT...West winds less than 10 knots veering north
after midnight.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-251700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EST Sun Feb 25 2018

...GALE WARNING IN EFFECT FROM 9 AM EST THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...East winds 15 to 25 knots. Snow.
.TODAY...Southwest gales to 40 knots becoming west gales to 45
knots with a few storm force gusts to 50 knots. A chance of snow
in the morning.
.TONIGHT...West gales to 40 knots diminishing to 15 to 25 knots.
.MONDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots by mid afternoon.
.MONDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots backing north.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-251700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EST Sun Feb 25 2018

...GALE WARNING IN EFFECT FROM 9 AM EST THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...South winds 10 to 20 knots. Snow likely.
.TODAY...South gales to 40 knots becoming west gales to 45 knots.
A slight chance of snow in the morning.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight.
.MONDAY...Southwest winds 10 to 20 knots backing south.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon.
.TUESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots backing north.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-251700-
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-
357 AM EST Sun Feb 25 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.EARLY THIS MORNING...Southeast gales to 40 knots. Snow. Waves
10 to 14 feet occasionally to 18 feet subsiding to 8 to 11 feet
occasionally to 14 feet.
.TODAY...South gales to 40 knots becoming west gales to 45 knots
by late morning with a few storm force gusts to 50 knots. A
chance of snow and drizzle in the morning. Waves subsiding to 4
to 7 feet occasionally to 9 feet, then building to 9 to 12 feet
occasionally to 15 feet.
.TONIGHT...West gales to 40 knots diminishing to 20 to 30 knots
by midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.MONDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by late morning, then backing south by mid afternoon. A
slight chance of snow in the morning. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 2 to 4 feet.
.THURSDAY...Northeast winds 20 to 30 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-251700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EST Sun Feb 25 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.EARLY THIS MORNING...Southeast gales to 45 knots. Snow, possibly
mixed with sleet and freezing rain. Waves 6 to 10 feet
occasionally to 13 feet.
.TODAY...Southwest gales to 40 knots. A chance of drizzle and
snow in the morning. Waves subsiding to 4 to 7 feet occasionally
to 9 feet, then building to 8 to 11 feet occasionally to 14 feet.
.TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots
by midnight. A slight chance of snow after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by late morning, then backing south by mid afternoon. A
slight chance of snow, possibly mixed with freezing rain in the
morning. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 1 to 3 feet.
.THURSDAY...Northeast winds 20 to 30 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-251700-
MAFOR 2510/
Superior West...Gale Warning in effect...11427 11650 12650 19660 11650
12640 11530. Chance of snow through mid morning. Waves omitted
for mostly ice covered areas.

Superior North Central...Gale Warning in effect...11337 11560
13660 19670 11650 11640 11630. Chance of snow late this morning
today. Waves omitted for mostly ice covered areas.

Superior South Central...Gale Warning in effect...11420 11560
12660 11650 11640 12630. Chance of snow through mid morning.
Waves omitted for mostly ice covered areas.

Superior East...Gale Warning in effect...11367 11550 11560 11660
13650 11640. Chance of snow late this morning today. Waves 9 to
12 feet subsiding to 5 to 8 feet, then building to 9 to 12 feet
today. Waves 9 to 12 feet subsiding to 5 to 8 feet tonight.

$$

JLA

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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