Great Lakes Forecast Issued by NWS
000
FZUS63 KMQT 131359
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 AM EDT Wed Mar 13 2024
For waters beyond 5 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 29.8 inch trough over southern Ontario slowly moves
east toward New England through tonight, weakening to 30.0 inches
by Thursday morning. Behind the trough, 30.2 inch ridging builds
southeast from northern Manitoba, reaching the Upper Great Lakes
Wednesday night. On Thursday, Lake Superior will be between 30.3
inch ridging over northern Ontario and a 29.8 inch low approaching
southern Lake Michigan. The ridge will remain overhead Friday,
but weaken Friday night to 30.0 inches while the low approaches
the Northeast U.S. at 29.7 inches. Friday night, a 29.4 inch
Alberta Clipper low will approach Lake Superior, passing north of
the lake on Saturday, and continue eastward into Quebec Saturday
night into Sunday. By Sunday evening, a 30.4 inch high will be
over Manitoba.
LSZ162-132200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 AM EDT Wed Mar 13 2024 /859 AM CDT Wed Mar 13 2024/
.REST OF TODAY...North winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight, then becoming northeast 15 to 25 knots
late. Waves building to 1 to 3 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming east 10 to
20 knots late. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. A chance of rain showers
through midnight, then rain showers likely after midnight. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 20 to 30 knots veering northwest. A chance
of rain showers. A chance of snow showers. Waves subsiding to
2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves 2 to 4 feet.
$$
LSZ263-132200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
959 AM EDT Wed Mar 13 2024
.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.FRIDAY...North winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots. A chance of rain
showers, possibly mixed with snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
$$
LSZ264-132200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 AM EDT Wed Mar 13 2024
.REST OF TODAY...Northwest winds 5 to 15 knots backing west late.
Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.THURSDAY...Northeast winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves building to
1 to 3 feet.
.FRIDAY...North winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 20 to 30 knots veering north. A chance of
rain showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...North winds 20 to 30 knots. Freezing spray. A chance of
snow showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 4 to 7 feet occasionally to 9 feet.
$$
LSZ265-132200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 AM EDT Wed Mar 13 2024
.REST OF TODAY...Northwest winds 5 to 15 knots veering north
late. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then veering northeast late. Waves calm to
2 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north late.
Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves calm to
2 feet.
.FRIDAY...North winds 5 to 15 knots becoming west 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots increasing to
20 to 30 knots after midnight. A chance of rain showers after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...West winds 20 to 30 knots with a few gale force gusts
to 35 knots possible veering north. A chance of rain showers. A
chance of snow showers. Waves building to 3 to 5 feet occasionally
to 7 feet.
.SUNDAY...North winds 20 to 30 knots. A chance of snow showers,
then snow showers likely. Freezing spray. Waves building to 4 to
7 feet occasionally to 9 feet.
$$
LSZ266-132200-
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-
959 AM EDT Wed Mar 13 2024
.REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to 2
feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then veering northeast late. Waves calm
to 2 feet.
.THURSDAY...Northeast winds 15 to 25 knots backing north late.
Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots. Waves building to
2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots with a few gale force gusts
to 35 knots possible veering north. A chance of rain and snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...North winds 20 to 30 knots with a few gale force gusts
to 35 knots possible. A chance of snow showers, then snow showers
likely. Freezing spray. Waves building to 4 to 8 feet
occasionally to 10 feet.
$$
LSZ267-132200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 AM EDT Wed Mar 13 2024
.REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then becoming northeast 10 to 20 knots
late. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots late. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots backing north
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots after midnight. A chance of rain showers after midnight.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots becoming north 20 to
30 knots. Rain showers likely. A chance of snow showers. A chance
of rain showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.SUNDAY...North winds 20 to 30 knots. A chance of snow showers.
Freezing spray. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
$$
LSZ261-132200-
MAFOR 1315/
Superior West 11800 12400 11200 11210 11220 11120 11130. Waves 1
foot or less this afternoon building to 2 to 3 feet tonight.
Waves 3 to 5 feet Thursday morning.
Superior North Central 12710 11600 11710 11820 13120. Waves 1 to
4 feet.
Superior South Central 11710 11700 12800 11810 12110 11120. Waves
2 feet or less this afternoon and tonight. Waves 2 to 3 feet
Thursday morning.
Superior East 14710 11810 11110 12120. Waves 1 to 3 feet.
$$
Jablonski
Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
Graphical marine forecasts are available online at:
weather.gov/greatlakes