Great Lakes Forecast
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FZUS63 KMQT 142007
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
407 PM EDT Sat Oct 14 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...Low pressure of 29.7 inches over the central plains
will deepen to 29.4 inches as it tracks toward the Upper Great
Lakes tonight. This low will strengthen to 29.3 inches as it
reaches southern Quebec on Sunday afternoon. In the wake of this
low, high pressure of 30.4 inches will track across the Southern
Plains on Sunday and extend a ridge of 30.1 inches over the Great
Lakes on Monday. A weak trough of 29.9 inches will quickly sweep
over the Upper Great Lakes area Monday into Tuesday, followed by a
30.1 inch ridge.

LSZ162-150415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
407 PM EDT Sat Oct 14 2017 /307 PM CDT Sat Oct 14 2017/

...GALE WARNING IN EFFECT FROM 11 PM EDT /10 PM CDT/ THIS EVENING
THROUGH SUNDAY MORNING...

.LATE THIS AFTERNOON...East winds 20 to 30 knots. A slight chance
of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 20 to 30 knots increasing to gales to
35 knots after midnight, then backing north late. A chance of
showers through midnight, then showers after midnight. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 10 to
20 knots in the afternoon, then becoming west 15 to 25 knots
late. A chance of showers through early afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. Waves building
to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

$$

LSZ263-150415-
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-
407 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM 11 PM EDT THIS EVENING THROUGH
SUNDAY MORNING...

.LATE THIS AFTERNOON...East winds 15 to 25 knots. A slight chance
of showers. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 20 to 30 knots becoming northeast gales to
35 knots after midnight, then becoming north gales to 40 knots
late. A chance of showers through midnight, then showers after
midnight. Waves building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY...North gales to 35 knots diminishing to 15 to 25 knots
in the afternoon, then becoming northwest 10 to 20 knots late. A
chance of showers through early afternoon. Waves subsiding to
2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ264-150415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
407 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
MORNING...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots becoming northeast 20 to
30 knots after midnight, then increasing to gales to 35 knots
late. Showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.SUNDAY...North gales to 40 knots diminishing to 20 to 30 knots
in the afternoon, then becoming northwest 15 to 25 knots late. A
chance of showers through early afternoon. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ265-150415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
407 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
EVENING...

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...East winds 20 to 30 knots becoming northeast gales to
45 knots after midnight. Showers. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY...North gales to 40 knots becoming northwest 20 to
30 knots late. Showers through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

$$

LSZ266-150415-
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-
407 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
EVENING...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots becoming northeast 20 to
30 knots after midnight, then increasing to gales to 45 knots
late. Showers. Waves building to 9 to 12 feet occasionally to
15 feet.
.SUNDAY...North gales to 45 knots with a few storm force gusts to
50 knots in the morning, then diminishing to gales to 40 knots in
the afternoon, then becoming northwest gales to 35 knots late.
Showers through early afternoon, then a chance of showers by mid
afternoon. Waves building to 12 to 17 feet occasionally to 21
feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then backing west late. Waves
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-150415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
407 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
EVENING...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then becoming northeast gales to 45 knots late.
Showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY...Northeast gales 45 knots becoming north in the
afternoon. Occasional storm force guts to 50 knots in the morning.
Showers through early afternoon, then a chance of showers by mid
afternoon. Waves building to 11 to 15 feet occasionally to 19
feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then backing northwest late. A slight
chance of showers through midnight. Waves subsiding to 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming west 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ261-150415-
MAFOR 1421/
Superior West...Gale Warning in effect...11230 11140 11146 11156
11856 11840 11830 11720. Chance of showers late this evening and
Sunday morning. Waves 3 to 6 feet building to 6 to 9 feet
tonight. Waves 6 to 10 feet subsiding to 3 to 5 feet Sunday.

Superior North Central...Gale Warning in effect...11210 11220
11136 12156 11856 12840. Chance of showers late this evening.
Chance of showers early Sunday afternoon. Waves 1 to 3 feet
building to 4 to 7 feet tonight. Waves 8 to 11 feet subsiding to
4 to 7 feet Sunday.

Superior South Central...Gale Warning in effect...11220 11230
11146 11156 11166 11866 11856 11850. Chance of showers this
evening. Waves 2 to 4 feet building to 6 to 9 feet tonight. Waves
10 to 14 feet subsiding to 8 to 11 feet Sunday.

Superior East...Gale Warning in effect...12220 11136 11156 12176
11876 11850. Chance of showers late this evening and Sunday.
Waves 2 to 4 feet building to 4 to 7 feet tonight. Waves 10 to 14
feet subsiding to 7 to 10 feet Sunday.

$$

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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