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fzus63 kmqt 190203
glfls 
expires:202403191015;;981473

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. 

$$
fzus63 kmqt 190203
glfls 
expires:202403191015;;981474

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. 


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. 

$$
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