fzus63 kmqt 200153
glfls 
expires:202404201000;;045475

open lake forecast for lake superior
national weather service marquette mi
953 pm edt fri apr 19 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 29.4 inch low pressure over northern quebec
continues to deepen tonight into saturday morning as a 30.4 inch 
high pressure over the northern rockies near the international 
border builds southeast into the northern plains. this brings
ridging of 30.1 inches over lake superior by saturday, creating a
tight southwest to northeast pressure gradient over the lake. the
gradient begins to slack on sunday as the high pressure slides 
into the southern plains and a weak 29.9 inch trough extending 
from quebec skirts over the eastern half of lake superior. a 
brief period of 30.1 inch high pressure meanders south out of the 
canadian prairies sunday night into monday before broad 29.6 inch
low pressure begins moving eastward into the great lakes on 
tuesday. this low centers over lake superior tuesday morning at 
29.5 inches progressively weakens to 29.8 inches while heading
towards southern ontario throughout the day. a 30.4 inch high 
pressure over northern ontario then moves over lake superior in 
its wake wednesday.


lsz162-201000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
953 pm edt fri apr 19 2024 /853 pm cdt fri apr 19 2024/

.rest of tonight...west winds 20 to 30 knots veering northwest
late. a slight chance of rain and snow showers by late evening.
waves 3 to 6 feet occasionally to 8 feet, then subsiding to 3 to
5 feet occasionally to 7 feet. 
.saturday...northwest winds 15 to 25 knots backing west in the
afternoon. waves subsiding to 2 to 4 feet. 
.saturday night...west winds 10 to 20 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.sunday night...northeast winds 5 to 15 knots veering east after
midnight. waves subsiding to calm to 2 feet. 
.monday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves calm to 2 feet. 
.monday night...east winds 15 to 25 knots becoming northeast
20 to 30 knots after midnight. rain showers. snow showers likely
after midnight. waves building to 3 to 5 feet occasionally to
7 feet. 
.tuesday...northeast winds 20 to 30 knots diminishing to 15 to
25 knots. a chance of rain showers, possibly mixed with snow.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 1 to 3 feet. 
.wednesday...east winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 

$$