National Weather Service United States Department of Commerce

Another Eastern Storm to Bring Severe Thunderstorms and Renewed Flooding

A large area of low pressure is forecast to shift from the central U.S. Thursday across the Northeast this weekend. Isolated to scattered severe thunderstorms will be possible Thursday from Florida to the Carolinas with damaging winds and a few tornadoes the main threats. Heavy rain from the Mid-Atlantic through New England may lead to urban and renewed river flooding Friday and Saturday. Read More >

 

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Marine Observations for Lake Superior
Local Radars
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Nearshore Forecast


000
FZUS53 KDLH 280257
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
957 PM CDT Wed Oct 27 2021

For waters within 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.

LSZ140-141-281015-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...East wind 10 to 15 knots with gusts to around
20 knots becoming southeast 5 to 10 knots toward daybreak. Slight
chance of rain showers toward daybreak. Waves 2 to 4 feet.
.THURSDAY...Southeast wind 5 to 10 knots becoming northeast late
in the afternoon. Slight chance of rain showers. Waves 1 to
3 feet.
.THURSDAY NIGHT...North wind 5 to 10 knots. Gusts up to 20 knots
early in the morning. Slight chance of rain showers through the
night. Waves 1 foot or less.
.FRIDAY...North wind 5 to 10 knots. Gusts up to 20 knots in the
morning. Mostly sunny. Waves 1 foot or less.

$$

LSZ142-143-281015-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...East wind 10 to 15 knots with gusts to around
20 knots becoming southeast 5 to 10 knots after midnight. Slight
chance of rain showers late in the evening, then chance of rain
showers after midnight. Waves 2 to 4 feet subsiding to 1 to
3 feet toward daybreak.
.THURSDAY...Southeast wind 5 to 10 knots becoming northeast late
in the afternoon. Chance of rain showers in the morning, then
slight chance of rain showers in the afternoon. Waves 1 to
2 feet.
.THURSDAY NIGHT...North wind 5 to 10 knots. Gusts up to 20 knots
early in the morning. Chance of rain showers in the evening.
Waves 1 foot or less.
.FRIDAY...North wind 5 to 10 knots. Gusts up to 20 knots in the
morning. Mostly sunny. Waves 1 foot or less.

$$

LSZ144-145-281015-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...East wind 10 to 15 knots becoming southeast
5 to 10 knots toward daybreak. Slight chance of rain showers late
in the evening, then chance of rain showers after midnight. Rain
showers likely toward daybreak. Waves 1 to 3 feet.
.THURSDAY...Southeast wind 5 to 10 knots becoming north late in
the afternoon. Chance of rain showers. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Gusts up to 20 knots
early in the morning. Chance of rain showers in the evening.
Waves 1 foot or less.
.FRIDAY...North wind 5 to 10 knots with gusts to around 20 knots
becoming northeast late in the afternoon. Mostly sunny. Waves
1 to 2 feet.

$$

LSZ146-147-281015-
Port Wing to Sand Island WI-Sand Island to Bayfield WI-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast wind 5 to 10 knots. Slight chance of
rain showers through the night. Waves 1 to 2 feet.
.THURSDAY...Southeast wind 5 to 10 knots becoming north in the
afternoon. Chance of rain showers in the morning, then slight
chance of rain showers in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 10 to 15 knots. Chance of rain
showers in the evening, then slight chance of rain showers after
midnight. Waves 1 to 2 feet.
.FRIDAY...North wind 10 to 15 knots. Mostly sunny. Waves 1 to
2 feet.

$$

LSZ150-281015-
Outer Apostle Islands Beyond 5 NM from Mainland-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast wind 10 to 15 knots with gusts to
around 20 knots easing to 5 to 10 knots after midnight. Slight
chance of rain showers after midnight. Waves 1 to 3 feet.
.THURSDAY...Southeast wind 5 to 10 knots becoming west early in
the afternoon, then becoming north late in the afternoon. Slight
chance of rain showers. Waves 1 to 2 feet.
.THURSDAY NIGHT...North wind 10 to 15 knots. Chance of rain
showers through the night. Waves 1 to 2 feet.
.FRIDAY...North wind 10 to 15 knots. Mostly sunny. Waves 1 to
3 feet.

$$

LSZ121-281015-
Chequamegon Bay-Bayfield to Oak Point WI-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast wind 5 to 10 knots. Slight chance of
rain showers after midnight. Waves 1 foot or less.
.THURSDAY...Southeast wind 5 knots becoming northeast in the
afternoon. Slight chance of rain showers in the morning, then
chance of rain showers in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Chance of rain
showers through the night. Waves 1 foot or less.
.FRIDAY...North wind 5 to 10 knots. Partly sunny. Waves 1 foot or
less.

$$

LSZ148-281015-
Oak Point to Saxon Harbor WI-
957 PM CDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast wind 5 to 10 knots. Slight chance of
rain showers after midnight. Waves 1 to 2 feet.
.THURSDAY...Southeast wind 5 to 10 knots becoming north in the
afternoon. Slight chance of rain showers in the morning, then
chance of rain showers in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Chance of rain
showers. Waves 1 to 2 feet.
.FRIDAY...North wind 10 to 15 knots. Partly sunny. Waves 1 to
3 feet.

$$

Graphical marine forecasts are available online at:
weather.gov/greatlakes

BJH

Duluth, MichiganLSZ140 Grand Portage to Grank Marais MN LSZ141 Grand Marais to Taconite Harbor MN LSZ142 Taconite Harbor to Silver Bay Harbor MN LSZ143 Silver Bay Harbor to Two Harbors MN LSZ144 Two Harbors to Duluth MN LSZ145 Duluth MN to Port Wing WI LSZ146 Port Wing to Sand Island WI LSZ147 Sand Island to Bayfield WI LSZ148 Oak Point to Saxon Harbor WI LSZ121 Chequamegon Bay - Bayfield to Oak Point WI LSZ140 Grand Portage to Grank Marais MN LSZ141 Grand Marais to Taconite Harbor MN LSZ142 Taconite Harbor to Silver Bay Harbor MN LSZ143 Silver Bay Harbor to Two Harbors MN LSZ144 Two Harbors to Duluth MN LSZ145 Duluth MN to Port Wing WI LSZ146 Port Wing to Sand Island WI LSZ147 Sand Island to Bayfield WI LSZ148 Oak Point to Saxon Harbor WI LSZ121 Chequamegon Bay - Bayfield to Oak Point WI

Open Waters Forecast


000
FZUS63 KMQT 280157
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
957 PM EDT Wed Oct 27 2021

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 ridge slowly moves east across Quebec
through Saturday. A 29.4 inch trough develops Thursday morning and
slowly tracks east across the Ohio Valley, reaching the Mid-
Atlantic by Saturday morning. The Upper Great Lakes will be wedged
between these systems, with pressure lingering around 29.9 inches
through Saturday. A 29.7 inch trough pivots across Lake Superior
on Sunday ahead of a sprawling surface ridge moves onto the
Plains. By Monday, pressures rise to around 30.1 inches over Lake
Superior as 30.4 inch ridging builds across the Plains.


&&

LSZ162-281000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
957 PM EDT Wed Oct 27 2021 /857 PM CDT Wed Oct 27 2021/

.REST OF TONIGHT...Southeast winds 10 to 20 knots. A slight
chance of showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing north late. A slight
chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.FRIDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering southwest by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west. Waves
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-281000-
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-
957 PM EDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast in the
afternoon, then becoming north 5 to 15 knots late. A chance of
showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of showers. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-281000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
957 PM EDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
late. Sprinkles after midnight. Waves 2 to 4 feet building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon. A slight chance of showers. Waves 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots becoming north less than
10 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots. A chance of rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.

$$

LSZ265-281000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
957 PM EDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing east late. A
slight chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing north late. A
slight chance of showers. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.

$$

LSZ266-281000-
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-
957 PM EDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Sprinkles after midnight. Waves 2 to 4 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing east late.
Sprinkles. Waves 1 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight, then becoming east 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-281000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
957 PM EDT Wed Oct 27 2021

.REST OF TONIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing east late.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots backing east
late. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers, then rain showers likely.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-281000-
MAFOR 2803/
Superior West 12320 12310 11300 11200 12800. A chance of showers
Thursday evening. Waves 1 to 4 feet.

Superior North Central 11330 11320 11420 14310 11310. Waves 3 to
5 feet overnight. Waves 1 to 4 feet Thursday.

Superior South Central 11330 12320 13310 12210. Waves 2 to 4
feet.

Superior East 13320 11310 13320 11310. Waves 2 to 3 feet.

$$

EK

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes