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Mt. Washington, NH
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FZUS63 KMQT 210304
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1004 PM EST Mon Nov 20 2017
For waters beyond five 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 29.2 inch low pressure over northwestern Ontario
will deepen to 29.1 inches as it moves north of Lake Superior
overnight and reaches James Bay by Tuesday afternoon. A 30.4 inch
high over the Northern Plains Tuesday evening will drift south
into the Central Plains Wednesday morning and weaken to 30.3
inches over the Ohio Valley on Wednesday night. On Thursday
morning, a 29.8 inch trough will settle south across the Upper
Great Lakes. A 30.0 inch ridge will then move over the Upper Great
Lakes Thursday night and into the Lower Great Lakes on Friday
morning. A 29.0 inch low will move to Lake Winnipeg Friday morning
and track east across northern Ontario Friday evening. This low
will drag a 29.2 inch trough across Lake Superior on late Friday
night. A 30.0 inch ridge then builds into the Upper Great Lakes on
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1004 PM EST Mon Nov 20 2017
Gale Warning - IN EFFECT FROM 6 AM EST TUESDAY THROUGH TUESDAY
.REST OF TONIGHT...South winds 20 to 30 knots veering southwest
late. Scattered rain showers. Waves 4 to 7 feet occasionally to 9
feet building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
45 knots. Numerous rain and snow showers. Waves building to 12 to
17 feet occasionally to 21 feet, then subsiding to 11 to 15 feet
occasionally to 19 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots by midnight. A chance of snow showers. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. A chance of snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest in the
afternoon. A chance of freezing rain, rain, and snow. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots with a few gale force gusts
to 35 knots turning west late. Rain and snow showers. Waves
building to 9 to 12 feet occasionally to 15 feet.
.SATURDAY...North gales to 35 knots diminishing to 20 to 30
knots. Snow showers likely. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.