Great Lakes Forecast Issued by NWS
000
FZUS63 KMQT 162003
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 PM EDT Sat Mar 16 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 29.3 inch low pressure system across northern
Ontario continues east today, moving over Quebec Sunday morning and
the Gulf of St Lawrence Monday morning. Meanwhile, a 30.6 inch high
pressure develops over northern Saskatchewan tonight then shifts
south across the Plains on Sunday and Monday. Across Lake Superior,
ridging builds to around 30.1 inches Sunday night before gradually
weakening to 29.9 inches by Monday evening. Ridging is quickly
followed by a 29.6 inch low pressure that tracks southeast near Lake
Superior Monday night into Tuesday. In its wake, ridging builds to
at least 30.2 inches across the lake on Wednesday as a 30.7 inch
high develops near the Northwest Territories. This high pressure
tracks southeast toward Lake Superior on Thursday allowing ridging
over Lake Superior to build to 30.4 inches.
LSZ162-170415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Sat Mar 16 2024 /303 PM CDT Sat Mar 16 2024/
.LATE THIS AFTERNOON...Northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Waves 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...Northwest winds to 30 knots with a few gale force
gusts to 35 knots possible. Scattered snow showers. Freezing
spray after midnight. Waves building to 4 to 8 feet occasionally
to 10 feet.
.SUNDAY...North winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots in the afternoon.
Freezing spray through early afternoon. Isolated snow showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Isolated snow showers. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.MONDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of snow showers.
Waves building to 2 to 4 feet.
$$
LSZ263-170415-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
403 PM EDT Sat Mar 16 2024
...GALE WARNING IN EFFECT THROUGH SUNDAY AFTERNOON...
.LATE THIS AFTERNOON...Northwest gales to 35 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TONIGHT...Northwest gales to 35 knots then becoming north-
northwest gales to 35 knots after midnight. Scattered snow
showers. Freezing spray after midnight. Waves subsiding to 5 to 8
feet occasionally to 10 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
late. Freezing spray. Scattered snow showers. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. Freezing spray. Scattered snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.MONDAY...North winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of snow showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming east 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
$$
LSZ264-170415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Sat Mar 16 2024
...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
.LATE THIS AFTERNOON...Northwest gales to 35 knots. Isolated snow
showers. Waves 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Northwest gales to 35 knots becoming north gales to
40 knots after midnight. Scattered snow showers. Freezing spray
after midnight. Waves building to 10 to 14 feet occasionally to
18 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Scattered snow
showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Isolated snow showers.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Freezing spray through early afternoon.
Isolated snow showers through early afternoon. Waves subsiding to
1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. A chance of snow showers. Waves 1 to 3 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Freezing spray after midnight. Waves building to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming north 10 to
20 knots. Heavy freezing spray. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming east 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
$$
LSZ265-170415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Sat Mar 16 2024
...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
.LATE THIS AFTERNOON...West gales to 35 knots. Isolated snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest gales to 35 knots. Scattered snow showers
through midnight, then numerous snow showers after midnight.
Freezing spray after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SUNDAY...Northwest gales to 35 knots veering north late.
Freezing spray. Numerous snow showers. Waves building to 8 to
12 feet occasionally to 15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Scattered snow showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Freezing spray through early
afternoon. Isolated snow showers through early afternoon. Waves
subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots. Freezing spray
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering east. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
$$
LSZ266-170415-
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-
403 PM EDT Sat Mar 16 2024
...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
.LATE THIS AFTERNOON...West gales to 40 knots. Scattered snow
showers, possibly mixed with rain. Waves 7 to 11 feet
occasionally to 13 feet.
.TONIGHT...Northwest gales to 40 knots. Scattered snow showers.
Freezing spray after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Numerous snow
showers. Waves 10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. Freezing spray. Scattered snow showers. Waves
subsiding to 7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. Isolated snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots by mid afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots. A chance of snow
showers. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming north 15 to
25 knots. Freezing spray. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots veering east. A chance
of snow showers. Waves subsiding to 1 to 3 feet.
$$
LSZ267-170415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Sat Mar 16 2024
...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
.LATE THIS AFTERNOON...West gales to 40 knots. Scattered rain and
snow showers. Waves 8 to 11 feet occasionally to 14 feet.
.TONIGHT...Northwest gales to 40 knots. Isolated rain showers
through midnight. Scattered snow showers. Waves building to 10 to
14 feet occasionally to 18 feet.
.SUNDAY...Northwest gales to 40 knots becoming north gales to
35 knots late. Freezing spray through early afternoon. Scattered
snow showers. Waves subsiding to 9 to 12 feet occasionally to
15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. Scattered snow showers. Freezing spray after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Freezing spray. Isolated snow showers. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots backing southwest
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots increasing to
gales to 35 knots after midnight. A chance of snow showers.
Freezing spray after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming north 15 to
25 knots. Freezing spray. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots veering east. A chance of
snow showers. Waves subsiding to 1 to 3 feet.
$$
LSZ261-170415-
MAFOR 1621/
Superior West...GALE WARNING IN EFFECT...12750 11740 12741 19747
11840 19847 11840 11740. Waves 5 to 8 feet tonight. Waves 4 to 7
feet subsiding to 3 to 5 feet Sunday.
Superior North Central...GALE WARNING IN EFFECT...12750 11750
19757 11851 19857 13857 11851 19857. Waves 5 to 9 feet building
to 9 to 12 feet tonight. Waves 9 to 13 feet Sunday.
Superior South Central...GALE WARNING IN EFFECT...11650 13750
19757 14757. Waves 5 to 8 feet building to 9 to 13 feet tonight.
Waves 10 to 14 feet Sunday.
Superior East...GALE WARNING IN EFFECT...11650 19657 14750 19757
11751 19757 11851 19857 11850 19857. Waves 8 to 12 feet building
to 10 to 14 feet tonight. Waves 9 to 13 feet subsiding to 8 to 11
feet Sunday.
$$
EK
Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
Graphical marine forecasts are available online at:
weather.gov/greatlakes