Great Lakes Forecast Issued by NWS
000
FZUS63 KMQT 211330
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
930 AM EDT Thu Mar 21 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...Ridging builds to 30.4 inches across the Great Lakes
today. A weak 30.2 inch inverted trough moves across Lake Superior
on Friday as a 29.8 inch low pressure skirts along the Ohio River
Valley. Ridging around 30.4 inches builds into the High Plains
and Lake Superior on Saturday. A deep low pressure near 29.2
inches ejects out of Rockies on Sunday, moving towards the western
Great Lakes on Monday.
LSZ162-212130-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
930 AM EDT Thu Mar 21 2024 /830 AM CDT Thu Mar 21 2024/
.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of snow showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing northwest late.
A chance of snow through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A slight chance of snow showers
through midnight. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing southwest by
mid afternoon. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 15 to 25 knots increasing to gales to
35 knots. A chance of snow, then snow likely. Waves building to
7 to 10 feet occasionally to 13 feet.
.MONDAY...East gales to 40 knots. Snow, rain. Waves building to
9 to 12 feet occasionally to 15 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
$$
LSZ263-212130-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
930 AM EDT Thu Mar 21 2024
.REST OF TODAY...Northwest winds 5 to 15 knots backing west late.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast after
midnight. A slight chance of snow showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then becoming northwest 15 to 25 knots late. A chance
of snow. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots becoming north
15 to 25 knots after midnight. A slight chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to gales to
35 knots. A chance of snow, then snow likely. Waves building to
6 to 9 feet occasionally to 11 feet.
.MONDAY...East gales to 35 knots. Snow, rain. Waves building to
8 to 12 feet occasionally to 15 feet.
$$
LSZ264-212130-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
930 AM EDT Thu Mar 21 2024
.REST OF TODAY...Northwest winds 5 to 15 knots backing west late.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of snow. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. A slight chance of
snow showers. Freezing spray after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
A chance of snow. Waves building to 5 to 8 feet occasionally to
10 feet.
.MONDAY...East gales to 40 knots. Snow likely. Rain likely. Waves
building to 8 to 12 feet occasionally to 15 feet.
$$
LSZ265-212130-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
930 AM EDT Thu Mar 21 2024
.REST OF TODAY...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southeast after
midnight, then becoming south 10 to 20 knots late. A slight
chance of snow showers after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north in the
afternoon, then increasing to 10 to 20 knots late. Snow likely
through early afternoon, then a chance of snow by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow, then snow likely. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. Snow likely. Rain likely. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
$$
LSZ266-212130-
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-
930 AM EDT Thu Mar 21 2024
.REST OF TODAY...Northwest winds 10 to 20 knots. A slight chance
of snow showers by late morning. Waves 3 to 5 feet occasionally
to 7 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 10 to 20 knots late. A chance of snow showers
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering northwest late. Snow
through early afternoon, then a chance of snow by mid afternoon.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow showers. Freezing spray
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. Snow likely. Rain likely. Waves building to 8 to
12 feet occasionally to 15 feet.
$$
LSZ267-212130-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
930 AM EDT Thu Mar 21 2024
.REST OF TODAY...North winds 10 to 20 knots backing northwest
late. A chance of snow showers. Waves 3 to 5 feet occasionally to
7 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 5 to 15 knots
after midnight, then increasing to 10 to 20 knots late. A chance
of snow showers after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southeast late. A chance
of snow. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of snow showers. Freezing
spray after midnight. Waves building to 3 to 6 feet occasionally
to 8 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Freezing spray through early
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming east 15 to
25 knots. A chance of snow. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. A chance of snow. Rain likely. Waves building to 6 to
9 feet occasionally to 11 feet.
$$
LSZ261-212130-
MAFOR 2115/
Superior West 11710 11610 11510 11400 12300 11200 11110. A chance
of snow Friday morning. Waves 1 foot or less.
Superior North Central 12710 11610 12500 12400 11500. Waves 1 to
3 feet this afternoon and tonight. Waves 1 foot or less Friday
morning.
Superior South Central 11720 11710 11700 11600 12400 11410 11527.
Waves 1 to 4 feet this afternoon. Waves 2 feet or less tonight
and Friday morning.
Superior East 11720 12710 11610 11600 11400 11410 11437. A chance
of snow showers late this morning. Waves 1 to 4 feet.
$$
GS
Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
Graphical marine forecasts are available online at:
weather.gov/greatlakes