Great Lakes Forecast
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FZUS63 KMQT 240155
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
955 PM EDT Mon Oct 23 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...A low pressure of 29.4 inches over central Michigan
will continue lifting northward toward eastern Upper Michigan
while deepening to nearly 29.8 inches overnight. The low will then
stall along the northern shore of Lake Michigan and slowly
weaken to 29.3 inches by late Tuesday night. Wednesday, the low
will lift toward southern Quebec as a 29.8 inch high pressure
ridge builds into Lake Superior. Another low pressure of 29.4
inches over the Northern Plains Wednesday evening will track
southeastward and reach the Upper Great Lakes Thursday. The low
will move quickly across the Upper Great Lakes and depart Friday
night as a 30.1 inch ridge shifts over the region on Saturday.

LSZ162-241000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
955 PM EDT Mon Oct 23 2017 /855 PM CDT Mon Oct 23 2017/

...GALE WARNING IN EFFECT THROUGH LATE TUESDAY NIGHT...

.REST OF TONIGHT...North winds 20 to 30 knots increasing to gales
to 45 knots. Scattered showers. Waves 2 to 4 feet building to 9
to 12 feet occasionally to 15 feet.
.TUESDAY...North gales to 45 knots. A chance of showers. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...North gales to 35 knots becoming northwest 20 to
30 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of rain showers after midnight. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of showers after
midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming north gales
to 35 knots by mid afternoon. Showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North gales to 45 knots. Rain showers. Snow
showers likely after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.FRIDAY...North gales to 40 knots becoming northwest 10 to
20 knots. A chance of rain showers, possibly mixed with snow.
Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ263-241000-
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-
955 PM EDT Mon Oct 23 2017

...STORM WARNING IN EFFECT FROM 2 AM EDT TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...North winds 20 to 30 knots increasing to gales
to 45 knots. Scattered showers. Waves 1 to 3 feet building to 10
to 14 feet occasionally to 18 feet.
.TUESDAY...North storm force winds to 60 knots. Rain showers.
Waves building to 15 to 20 feet occasionally to 25 feet, then
subsiding to 12 to 17 feet occasionally to 21 feet.
.TUESDAY NIGHT...North gales to 45 knots diminishing to 15 to 25
knots through the night. A chance of rain showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of rain showers after
midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 15 to 25 knots becoming east 20 to
30 knots by mid afternoon. Rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North gales to 45 knots. Rain showers. Snow
showers likely after midnight. Waves building to 11 to 15 feet
occasionally to 19 feet.
.FRIDAY...North gales to 45 knots becoming northwest 15 to
25 knots. A chance of rain showers, possibly mixed with snow.
Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ264-241000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
955 PM EDT Mon Oct 23 2017

...STORM WARNING IN EFFECT FROM 4 AM EDT TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
gales to 45 knots late. showers likely. Waves 1 to 3 feet
building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...North storm force winds to 60 knots with a few hurricane
force wind gusts to 65 knots. Rain showers. Waves building to 20
to 25 feet occasionally to 31 feet, then subsiding to 15 to 20
feet occasionally to 25 feet.
.TUESDAY NIGHT...North storm force winds to 50 knots diminishing
to 20 to 30 knots. Rain showers likely through midnight, then a
slight chance of rain showers after midnight. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 15 to 25 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northeast gales to 45 knots becoming north
storm force winds to 50 knots after midnight. Rain showers. Waves
building to 12 to 17 feet occasionally to 21 feet.
.FRIDAY...North storm force winds to 50 knots becoming northwest
20 to 30 knots. Rain showers likely. Waves subsiding to 1 to 3
feet.
.SATURDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. A chance of rain showers.
Waves subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-241000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
955 PM EDT Mon Oct 23 2017

...STORM WARNING IN EFFECT FROM 4 AM EDT TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
storm force winds to 55 knots late. showers likely. Waves calm to
2 feet building to 11 to 15 feet occasionally to 19 feet.
.TUESDAY...North storm force winds to 60 knots with a few
hurricane force wind gusts to 65 knots. Showers. Waves building
to 22 to 27 feet occasionally to 34 feet, then subsiding to 17 to
22 feet occasionally to 28 feet.
.TUESDAY NIGHT...North storm force winds to 55 knots diminishing
to gales to 40 knots after midnight, then becoming northwest
gales to 35 knots late. Rain showers through midnight, then a
chance of rain showers after midnight. Waves subsiding to 7 to
10 feet occasionally to 13 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots backing southeast by mid
afternoon. A chance of rain showers through early afternoon, then
rain showers likely by mid afternoon. Waves building to 2 to
4 feet.
.THURSDAY NIGHT...East gales to 40 knots becoming northeast storm
force winds to 50 knots after midnight. Rain showers. Waves
building to 12 to 17 feet occasionally to 21 feet.
.FRIDAY...North gales to 45 knots becoming northwest gales to
35 knots. Rain showers likely, then a chance of rain showers,
possibly mixed with snow. Waves subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of rain showers, possibly mixed with snow,
then rain showers likely. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-241000-
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-
955 PM EDT Mon Oct 23 2017

...STORM WARNING IN EFFECT FROM 2 AM EDT TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
storm force winds to 60 knots late. Showers. Waves calm to 2
feet building to 15 to 20 feet occasionally to 25 feet.
.TUESDAY...North storm force winds to 60 knots with a few
hurricane force wind gusts to 65 knots. Showers. Waves building
to 22 to 27 feet occasionally to 34 feet, then subsiding to 20 to
25 feet occasionally to 31 feet.
.TUESDAY NIGHT...North storm force winds to 55 knots diminishing
to gales to 45 knots after midnight. Rain showers. Waves
subsiding to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 15 to 25 knots. A chance of rain
showers through early afternoon, then rain showers likely by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...East gales to 45 knots becoming northeast storm
force winds to 50 knots after midnight. Rain showers. Waves
building to 12 to 17 feet occasionally to 21 feet.
.FRIDAY...North storm force winds to 50 knots diminishing to
gales to 35 knots. Rain showers likely, then a chance of rain
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers, possibly mixed with snow,
then rain showers likely. Waves subsiding to 1 to 3 feet, then
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-241000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
955 PM EDT Mon Oct 23 2017

...STORM WARNING IN EFFECT FROM 2 AM EDT TUESDAY THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...Northeast winds 15 to 25 knots increasing to
northerly storm force winds to 55 knots late. Showers. Waves calm
to 2 feet building to 12 to 17 feet occasionally to 21 feet.
.TUESDAY...Northeast storm force winds to 55 knots diminishing to
gales to 45 knots in the afternoon. Showers. Waves building to
15 to 20 feet occasionally to 25 feet, then subsiding to 12 to
17 feet occasionally to 21 feet.
.TUESDAY NIGHT...North gales to 40 knots. Rain showers. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots backing east
after midnight. Showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY...North gales to 35 knots. Rain showers likely, then a
chance of rain showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet, then building to 6 to 9 feet occasionally
to 11 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers, then rain showers likely.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$
LSZ261-241000-
MAFOR 2403/
Superior West...Storm Warning in effect...12850 11866 11876 11870
11860 12850. Scattered showers. Waves 3 to 5 feet building to 7
to 10 feet overnight. Waves building to 9 to 13 feet Tuesday, then
subsiding to 6 to 9 feet Tuesday evening.

Superior North Central...Storm Warning in effect...11120 11850
11876 13896 12876. Scattered showers. Waves 1 to 3 feet building
to 5 to 8 feet overnight. Waves building to 16 to 21 feet Tuesday
then subsiding to 7 to 12 feet Tuesday evening.

Superior South Central...Storm Warning in effect...11130 11856
11876 13896 12876. Scattered showers. Waves 1 foot or less
building to 7 to 10 feet overnight. Waves building to 21 to 26
feet Tuesday, then subsiding to 16 to 21 feet Tuesday evening.

Superior East...Storm Warning in effect...11156 13876 12176 11876
11866. Waves around 2 feet building to 10 to 13 feet overnight.
Waves building to 15 to 20 feet Tuesday, then subsiding to 12 to
17 feet Tuesday evening.

$$

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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