Great Lakes Forecast Issued by NWS
000
FZUS63 KMQT 190203
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1003 PM EDT Mon Mar 18 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 30.3 inch high pressure over the Southern Plains
this evening continues south while extending weak 30.0 inch ridging
across Lake Huron. Ridging shifts south ahead of a 29.6 inch low
pressure currently over far northwestern Ontario. This low tracks
southeast across eastern Lake Superior and adjacent portions of
Ontario late tonight while deepening to 29.4 inches on Tuesday
morning. By Tuesday night, the low pressure shifts east over
southern Quebec at 29.5 inches while a broad high pressure ridge
builds southeast toward the Great Lakes Basin. Ridging builds to
30.2 inches over Lake Superior by Wednesday evening then to 30.4
inches on Thursday. A weak 30.2 inch inverted trough moves across
Lake Superior on Friday before ridging of at least 30.4 inches moves
back over the lake on Saturday.
LSZ162-191015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1003 PM EDT Mon Mar 18 2024 /903 PM CDT Mon Mar 18 2024/
.REST OF TONIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots late. A slight chance of snow by late evening.
Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible late. Waves
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible. Freezing spray after midnight.
A slight chance of snow showers after midnight. Waves building to
4 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Heavy freezing spray through early
afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A chance of snow showers. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots. Waves building to 1 to 3 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. Waves subsiding to calm to 2 feet.
$$
LSZ263-191015-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1003 PM EDT Mon Mar 18 2024
...GALE WARNING IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
MORNING...
.REST OF TONIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight, then diminishing to 15 to 25 knots
late. A chance of snow by late evening. Waves 3 to 6 feet
occasionally to 8 feet building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots possible late. A slight chance of snow showers
by mid afternoon. Waves building to 5 to 8 feet occasionally to 10
feet.
.TUESDAY NIGHT...Northwest gales to 40 knots. Heavy freezing
spray. A slight chance of snow showers. Waves building to 6 to 9
feet occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. Heavy freezing spray. A slight chance
of snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots backing east after
midnight. A chance of snow showers. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
$$
LSZ264-191015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1003 PM EDT Mon Mar 18 2024
...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH
WEDNESDAY EVENING...
.REST OF TONIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
Snow by late evening, then a slight chance of snow after
midnight. Waves 3 to 6 feet occasionally to 8 feet building to
5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest winds 20 to 30 knots becoming northwest gales to
35 knots in the afternoon. A slight chance of snow showers by mid
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. Heavy freezing
spray. A chance of snow showers. Waves building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY...North gales to 40 knots becoming northwest gales to
35 knots by mid afternoon. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Freezing spray through midnight.
Isolated snow showers after midnight. Waves subsiding to 2 to
4 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to 1 to 3 feet.
$$
LSZ265-191015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1003 PM EDT Mon Mar 18 2024
...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH
WEDNESDAY EVENING...
.REST OF TONIGHT...West winds 15 to 25 knots backing southwest
after midnight, then veering west late. A chance of snow. Waves
1 to 3 feet building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest gales to
35 knots in the afternoon. A slight chance of snow showers. Waves
building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. A chance of snow
showers through midnight, then snow showers likely after
midnight. Heavy freezing spray after midnight. Waves building to
9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...Northwest gales to 40 knots. Heavy freezing spray.
Snow showers likely through early afternoon. A chance of snow
showers by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots. Freezing spray
through midnight. Scattered snow showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of snow showers. Waves calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.
$$
LSZ266-191015-
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-
1003 PM EDT Mon Mar 18 2024
...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH
WEDNESDAY EVENING...
.REST OF TONIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Snow likely by late evening, then
a chance of snow after midnight. Waves 2 to 4 feet building to
4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots with a few gale force gusts to 35 knots possible in the
afternoon, then increasing to gales to 40 knots late. A chance of
snow showers. Waves subsiding to 3 to 6 feet occasionally to 8
feet, then building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. Snow showers.
Freezing spray after midnight. Waves building to 12 to 17 feet
occasionally to 21 feet.
.WEDNESDAY...Northwest gales to 40 knots. Freezing spray. Snow
showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots becoming north
15 to 25 knots after midnight. Freezing spray. Scattered snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Scattered snow
showers through early afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming north 15 to
25 knots. Waves subsiding to 1 to 3 feet.
$$
LSZ267-191015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1003 PM EDT Mon Mar 18 2024
...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH
WEDNESDAY EVENING...
.REST OF TONIGHT...West winds 15 to 25 knots backing southwest
after midnight. Snow likely. Waves 2 to 4 feet building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then becoming northwest gales to
35 knots late. A chance of snow showers. Waves building to 8 to
11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. Snow showers.
Freezing spray after midnight. Waves building to 11 to 15 feet
occasionally to 19 feet.
.WEDNESDAY...North gales to 40 knots becoming northwest gales to
35 knots by mid afternoon. Freezing spray. Snow showers likely.
Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots becoming north
20 to 30 knots after midnight. Heavy freezing spray. Scattered
snow showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Scattered snow showers through early
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing south after
midnight. A chance of snow showers after midnight. Waves
subsiding to calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming north 15 to
25 knots. Waves subsiding to 1 to 3 feet.
$$
LSZ261-191015-
MAFOR 1903/
Superior West...GALE WARNING IN EFFECT...11540 11640 11630 11730
13740 11750. Waves 4 to 7 feet overnight then subsiding to 3 to 6
feet Tuesday. Waves 5 to 8 feet Tuesday evening.
Superior North Central...GALE WARNING IN EFFECT...11647 11640
11630 13740 12750. A chance of snow showers Tuesday evening.
Waves 5 to 8 feet overnight and Tuesday. Waves 6 to 10 feet
Tuesday evening.
Superior South Central...GALE WARNING IN EFFECT...11520 11530
12630 11740 13750. A chance of snow showers. Waves 1 to 4 feet overnight.
Waves 2 to 4 feet building to 7 to 10 feet Tuesday. Waves 8 to 11
feet Tuesday evening.
Superior East...GALE WARNING IN EFFECT...11627 11527 11537 11530
11630 12750 11757. Waves 2 to 4 feet building to 3 to 5 feet
overnight then building to 7 to 10 feet Tuesday. Waves 9 to 13
feet Tuesday evening.
$$
EK
Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
Graphical marine forecasts are available online at:
weather.gov/greatlakes