National Weather Service United States Department of Commerce

 

Welcome to the new NWS Duluth Marine Page. Any questions or comments can be sent to nws.duluth@noaa.gov.

 

Marine Observations for Lake Superior
Local Radars
Duluth         Marquette  
DLH Reflectivity       MQT Reflectivity
Reflectivity       Reflectivity

 

 

 

 

 

Nearshore Forecast


310
FZUS53 KDLH 260210
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
910 PM CDT Sun Jul 25 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.

LSZ140-141-261015-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...Northwest wind 5 to 10 knots. Mostly clear.
Waves 2 feet or less.
.MONDAY...Northwest wind 5 knots becoming south in the late
morning and early afternoon, then becoming southeast late in the
afternoon. Chance of showers and slight chance of thunderstorms
in the afternoon. Waves 2 feet or less.
.MONDAY NIGHT...Northeast wind 5 to 10 knots. Chance of showers
and thunderstorms. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 knots becoming east in the afternoon.
Mostly sunny. Waves 2 feet or less.

$$

LSZ142-143-261015-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...West wind 5 to 10 knots. Mostly clear. Waves
2 feet or less.
.MONDAY...West wind 5 knots becoming south late in the morning,
then becoming east in the afternoon. Slight chance of showers in
the morning, then chance of showers and slight chance of
thunderstorms in the afternoon. Waves 2 feet or less.
.MONDAY NIGHT...Northeast wind 5 to 10 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 to 10 knots. Mostly sunny. Waves
2 feet or less.

$$

LSZ144-145-261015-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...West wind 5 to 10 knots. Mostly clear. Waves
2 feet or less.
.MONDAY...Southwest wind 5 knots becoming east 10 to 15 knots in
the afternoon. Chance of showers and thunderstorms in the
afternoon. Waves 2 feet or less.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 to 10 knots. Mostly sunny. Waves
2 feet or less.

$$

LSZ146-147-261015-
Port Wing to Sand Island WI-Sand Island to Bayfield WI-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Mostly clear.
Waves 2 feet or less.
.MONDAY...Southwest wind 5 knots becoming northeast in the
afternoon. Slight chance of showers and thunderstorms in the
morning, then chance of showers and thunderstorms in the
afternoon. Waves 2 feet or less.
.MONDAY NIGHT...East wind 5 to 10 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 to 10 knots. Mostly sunny. Waves
2 feet or less.

$$

LSZ150-261015-
Outer Apostle Islands Beyond 5 NM from Mainland-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...West wind 5 to 10 knots. Mostly clear. Waves
2 feet or less.
.MONDAY...West wind 5 knots becoming southeast early in the
afternoon, then becoming east late in the afternoon. Slight
chance of showers in the morning, then chance of showers and
slight chance of thunderstorms in the afternoon. Waves 2 feet or
less.
.MONDAY NIGHT...East wind 5 to 10 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 to 10 knots. Mostly sunny. Waves
2 feet or less.

$$

LSZ121-261015-
Chequamegon Bay-Bayfield to Oak Point WI-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...Southwest wind 5 knots. Mostly clear. Waves
2 feet or less.
.MONDAY...Southwest wind 5 knots becoming northeast in the
afternoon. Slight chance of showers and thunderstorms in the
morning, then chance of showers and thunderstorms in the
afternoon. Waves 2 feet or less.
.MONDAY NIGHT...Northeast wind 5 to 10 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 knots. Mostly sunny. Waves 2 feet or
less.

$$

LSZ148-261015-
Oak Point to Saxon Harbor WI-
910 PM CDT Sun Jul 25 2021

.REST OF TONIGHT...Southwest wind 5 knots. Mostly clear. Waves
2 feet or less.
.MONDAY...Southwest wind 5 knots becoming northeast in the
afternoon. Slight chance of showers and thunderstorms in the
morning, then chance of showers and thunderstorms in the
afternoon. Waves 2 feet or less.
.MONDAY NIGHT...East wind 5 to 10 knots. Showers and
thunderstorms likely. Waves 2 feet or less.
.TUESDAY...Northeast wind 5 to 10 knots. Mostly sunny. Waves
2 feet or less.

$$

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

GSF


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


520
FZUS63 KMQT 260154
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
954 PM EDT Sun Jul 25 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...High pressure of 30.1 inches over the northern Plains
builds into the northern Great Lakes tonight into Monday.
Pressure across Lake Superior then waffles between 29.9 and 30.0
inches through mid-week. The next 29.8 inch trough approaches the
Upper Great Lakes late Wednesday into early Thursday. Ridging
returns late Thursday with pressure rising to around 30.1 inches.
The ridge builds to 30.2 inches Friday morning before a trough at
29.8 inches approaches the region Friday night.

LSZ162-261000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
954 PM EDT Sun Jul 25 2021 /854 PM CDT Sun Jul 25 2021/

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing east in the afternoon,
then increasing to 10 to 20 knots late. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-261000-
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-
954 PM EDT Sun Jul 25 2021

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet subsiding to calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing south in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northeast late.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots veering south. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering west. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-261000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
954 PM EDT Sun Jul 25 2021

.REST OF TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight, then diminishing to less than
10 knots late. A slight chance of showers and thunderstorms.
Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ265-261000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
954 PM EDT Sun Jul 25 2021

.REST OF TONIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots becoming north 5 to 15 knots
in the afternoon, then veering southeast late. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing east after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots. A slight chance of showers
and thunderstorms through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of showers through midnight. Waves calm
to 2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ266-261000-
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-
954 PM EDT Sun Jul 25 2021

.REST OF TONIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves 1 to 3 feet subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots backing north after
midnight, then becoming northeast 5 to 15 knots late. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ267-261000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
954 PM EDT Sun Jul 25 2021

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
late. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A slight chance of showers by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight, then becoming northeast 5 to 15 knots
late. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots veering north
after midnight. A chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...West winds 10 to 20 knots backing southwest. A chance
of showers. Waves calm to 2 feet.

$$
LSZ261-261000-
MAFOR 2603/
Superior West 14600 11400 11200 12210. A chance of showers and
thunderstorms Monday evening. Waves 2 feet or less.

Superior North Central 11610 11600 13610 12500 11520. Waves 1 to
3 feet.

Superior South Central 14610 11710 11100 11400 11410. A chance of
showers and thunderstorms Monday evening. Waves 2 feet or less.

Superior East 11500 13600 11700 12600 11610. Waves 1 to 2 feet.

$$

07

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

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


Beach Hazards


300
FZUS53 KDLH 251027
SRFDLH

Surf Zone Forecast
National Weather Service Duluth MN
527 AM CDT Sun Jul 25 2021

MNZ037-WIZ001-260430-
Carlton/Southern St. Louis-Douglas-
Including the beaches of Minnesota/Park Point and Wisconsin Point
527 AM CDT Sun Jul 25 2021

.TODAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
UV Index**..................Very High.
Water Temperature...........In the mid to upper 60s.
Weather.....................Sunny.
High Temperature............In the upper 80s.
Winds.......................West winds around 10 mph.
Sunrise.....................5:41 AM.
Sunset......................8:49 PM.

.MONDAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
Weather.....................Mostly sunny. A chance of showers and a
slight chance of thunderstorms.
High Temperature............In the mid 80s.
Winds.......................Southwest winds around 5 mph, becoming
south in the afternoon.
Sunrise.....................5:42 AM.
Sunset......................8:48 PM.

.TUESDAY...Wave height around 1 foot. Sunny. Highs in the upper 70s.
Northeast winds around 5 mph.
.WEDNESDAY...Wave height 1 foot or less. Partly sunny. A chance of
showers and a slight chance of thunderstorms. Highs in the mid 80s.
South winds around 5 mph.
.THURSDAY...Wave height 1 foot or less. Sunny. Highs in the upper
70s. North winds around 5 mph.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For lightning, waterspout, and UV definitions see:
https://www.weather.gov/beach/dlh


$$