Great Lakes Forecast
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000
FZUS63 KMQT 240245
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 PM EST Fri Feb 23 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 low pressure trough of 29.9 inches stretching
across the eastern Great Lakes will exit that area overnight as
high pressure of 30.3 inches builds into the Great Lakes region
Saturday. The high will move into Quebec as low pressure of 29.5
inches tracks northeast from the Central Plains into the Great
Lakes Saturday evening through Sunday. A 30.0 inch ridge will then
build into the Upper Great Lakes on Monday as a 29.4 inch low
moves across southern Manitoba. On Tuesday morning, a 29.8 inch
low will move across northern Ontario while a 30.3 inch high
pressure moves over the Lower Great Lakes. A 30.1 inch ridge
will arrive over the Upper Great Lakes on Wednesday.

LSZ162-241045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EST Fri Feb 23 2018 /845 PM CST Fri Feb 23 2018/

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.REST OF TONIGHT...West winds 5 to 15 knots.
.SATURDAY...Southwest winds less than 10 knots backing south by
late morning, then becoming northeast 10 to 20 knots by mid
afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. Patchy blowing snow.
Snow showers.
.SUNDAY...West gales to 35 knots. Patchy blowing snow. A chance
of snow showers.
.SUNDAY NIGHT...West winds 20 to 30 knots becoming southwest
10 to 20 knots after midnight. Patchy blowing snow in the
evening.
.MONDAY...Southwest winds 5 to 15 knots.
.MONDAY NIGHT...Southwest winds 10 to 20 knots.
.TUESDAY...Southwest winds 5 to 15 knots becoming northeast less
than 10 knots.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-241045-
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-
945 PM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.REST OF TONIGHT...West winds 5 to 15 knots.
.SATURDAY...Southwest winds 5 to 15 knots backing south by late
morning, then backing east by mid afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. Patchy blowing snow.
A chance of snow showers in the evening. Snow showers after
midnight.
.SUNDAY...West gales to 40 knots. Patchy blowing snow. A chance
of snow showers.
.SUNDAY NIGHT...West gales to 35 knots becoming southwest 15 to
25 knots after midnight. Patchy blowing snow.
.MONDAY...Southwest winds 5 to 15 knots.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight.
.TUESDAY...Southwest winds 5 to 15 knots becoming south less than
10 knots.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-241045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then diminishing to 5 to 15 knots late.
.SATURDAY...Southwest winds 5 to 15 knots backing southeast by
mid afternoon.
.SATURDAY NIGHT...East winds 10 to 20 knots increasing to gales
to 35 knots by midnight. Areas of blowing snow. A slight chance
of snow showers in the evening. Snow showers after midnight.
.SUNDAY...West gales to 40 knots. Patchy blowing snow. Snow
showers likely, possibly mixed with rain showers and freezing
rain in the morning. A chance of snow showers in the afternoon.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 15 to
25 knots after midnight. Patchy blowing snow.
.MONDAY...Southwest winds 10 to 20 knots.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight.
.TUESDAY...West winds 10 to 20 knots becoming south 5 to
15 knots.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-241045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late.
.SATURDAY...West winds 5 to 15 knots backing south by late
morning, then becoming southeast 10 to 20 knots by mid afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to gales
to 35 knots by midnight, then veering southeast late. Areas of
blowing snow. A chance of snow showers in the evening. Snow
showers after midnight.
.SUNDAY...West gales to 35 knots. Patchy blowing snow. A chance
of snow showers, possibly mixed with rain.
.SUNDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Patchy blowing snow in the evening.
.MONDAY...Southwest winds 10 to 20 knots backing south in the
afternoon.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-241045-
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-
945 PM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Isolated snow showers. Waves 3 to 5 feet
occasionally to 7 feet subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by late
morning, then backing southeast by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to gales
to 40 knots by midnight, then becoming southeast gales to
45 knots late. A slight chance of snow showers in the evening,
then snow showers, possibly mixed with rain and freezing rain
after midnight. Areas of blowing snow after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Southwest gales to 40 knots veering west in the
afternoon. Snow showers likely in the morning. A chance of rain
showers. A chance of snow showers in the afternoon. Patchy
blowing snow in the afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.SUNDAY NIGHT...West gales to 40 knots diminishing to 20 to
30 knots after midnight. Patchy blowing snow in the evening. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-241045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots by midnight, then diminishing to 5 to 15 knots
late. Patchy freezing drizzle. Isolated snow showers after
midnight. Waves 3 to 5 feet occasionally to 7 feet subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by late
morning, then backing southeast by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots increasing to
gales to 45 knots after midnight. Areas of blowing snow after
midnight. Snow showers, possibly mixed with freezing rain and rain
showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...Southwest gales to 40 knots veering west in the
afternoon. Rain and snow showers likely in the morning, then a
chance of snow showers, possibly mixed with rain in the
afternoon. Patchy blowing snow in the afternoon. Waves subsiding
to 2 to 4 feet, then building to 7 to 10 feet occasionally to
13 feet.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Patchy blowing snow in the evening. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-241045-
MAFOR 2404/
Superior West 12610 11600 12500 11210 11120 11230. Chance of snow
early Saturday evening. Waves omitted for mostly ice covered
areas.

Superior North Central 12610 11600 12500 11400 11310 11230. Waves
omitted for mostly ice covered areas.

Superior South Central 12610 12600 11400 12310 11230. Chance of
snow late Saturday evening. Waves omitted for mostly ice covered
areas.

Superior East 11720 13610 11500 11300 11320 11340. Patchy light
freezing drizzle late this evening. Waves calm to 4 feet.


$$

RJT

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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