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Marine Observations for Lake Superior
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Nearshore Forecast


000
FZUS53 KDLH 231441
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
941 AM CDT Sat Mar 23 2019

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.

LSZ140-141-232230-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
941 AM CDT Sat Mar 23 2019

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...Southwest wind 15 to 20 knots increasing to 20
to 25 knots. Sunny. Waves 3 to 5 feet. Waves occasionally to 7
feet.
.TONIGHT...Southwest wind 15 to 20 knots becoming west 5 to
10 knots after midnight, then becoming north 20 to 25 knots early
in the morning. Slight chance of drizzle after midnight. Waves
3 to 5 feet. Waves occasionally to 7 feet.
.SUNDAY...Northeast wind 20 to 25 knots easing to 5 to 10 knots
with gusts to around 20 knots late in the afternoon. Slight
chance of light freezing drizzle in the morning. Waves 3 to
5 feet. A small craft advisory may be needed.
.SUNDAY NIGHT...North wind 5 to 10 knots. Clear. Waves 1 to
3 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ142-143-232230-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
941 AM CDT Sat Mar 23 2019

.REST OF TODAY...Southwest wind 10 to 15 knots increasing to 15
to 20 knots. Sunny. Waves 2 feet or less building to 1 to 3 feet
in the afternoon.
.TONIGHT...Southwest wind 10 to 15 knots becoming northwest 5 to
10 knots early in the morning. Slight chance of drizzle and light
freezing drizzle after midnight. Waves 1 to 3 feet.
.SUNDAY...Northeast wind 20 to 25 knots. Slight chance of
drizzle, light freezing drizzle and snow showers in the morning.
Waves 3 to 5 feet building to 4 to 7 feet in the late morning and
afternoon. Waves occasionally to 9 feet. A small craft advisory
may be needed.
.SUNDAY NIGHT...East wind 5 to 10 knots becoming north in the
late evening and overnight. Mostly clear. Waves 2 to 4 feet
subsiding to 1 to 3 feet in the late evening and overnight.

Note...Wave height forecasts are for ice free areas.

$$

LSZ144-145-232230-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
941 AM CDT Sat Mar 23 2019

.REST OF TODAY...Southwest wind 10 to 15 knots. Sunny. Waves
2 feet or less.
.TONIGHT...Southwest wind 10 to 15 knots. Slight chance of light
freezing drizzle after midnight. Waves 2 feet or less.
.SUNDAY...East wind 20 to 25 knots. Gusts up to 35 knots in the
late morning and early afternoon decreasing to 30 knots. Slight
chance of drizzle and light freezing drizzle in the morning.
Waves 3 to 5 feet building to 4 to 7 feet in the late morning and
afternoon. Waves occasionally to 9 feet. A gale warning may be
needed.
.SUNDAY NIGHT...Northeast wind 5 to 10 knots with gusts to around
20 knots becoming northwest after midnight. Mostly clear. Waves
2 to 4 feet subsiding to 1 to 3 feet in the late evening and
overnight.

Note...Wave height forecasts are for ice free areas.

$$

LSZ146-147-232230-
Port Wing to Sand Island WI-Sand Island to Bayfield WI-
941 AM CDT Sat Mar 23 2019

.REST OF TODAY...Southwest wind 10 to 15 knots. Sunny. Waves 1 to
3 feet.
.TONIGHT...Southwest wind 10 to 15 knots. Slight chance of
drizzle and light freezing drizzle after midnight. Waves 1 to
3 feet.
.SUNDAY...East wind 20 to 25 knots. Gusts up to 35 knots in the
late morning and early afternoon decreasing to 30 knots. Slight
chance of drizzle, light freezing drizzle and snow showers in the
morning. Waves 3 to 5 feet building to 4 to 7 feet in the late
morning and afternoon. Waves occasionally to 8 feet. A gale
warning may be needed.
.SUNDAY NIGHT...East wind 5 to 10 knots becoming northwest after
midnight. Mostly clear. Waves 2 to 4 feet subsiding to 1 to
3 feet early in the morning.

Note...Wave height forecasts are for ice free areas.

$$

LSZ121-232230-
Chequamegon Bay-Bayfield to Oak Point WI-
941 AM CDT Sat Mar 23 2019

.REST OF TODAY...Southwest wind 10 to 15 knots. Sunny. Waves
2 feet or less.
.TONIGHT...Southwest wind 10 knots rising to 10 to 15 knots in
the late evening and early morning, then becoming west 5 to
10 knots early in the morning. Slight chance of light freezing
drizzle after midnight. Waves 2 feet or less.
.SUNDAY...Northeast wind 20 to 25 knots. Gusts up to 35 knots in
the late morning and early afternoon decreasing to 30 knots.
Slight chance of drizzle and light freezing drizzle in the
morning. Slight chance of snow showers through the day. Waves
2 feet or less building to 1 to 3 feet in the late morning and
early afternoon, then subsiding to 2 feet or less late in the
afternoon. A gale warning may be needed.
.SUNDAY NIGHT...Northeast wind 5 to 10 knots becoming northwest
after midnight. Mostly clear. Waves 2 feet or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ148-232230-
Oak Point to Saxon Harbor WI-
941 AM CDT Sat Mar 23 2019

.REST OF TODAY...Southwest wind 10 to 15 knots. Sunny. Waves
2 feet or less.
.TONIGHT...Southwest wind 10 to 15 knots. Slight chance of
drizzle and light freezing drizzle after midnight. Waves 2 feet
or less.
.SUNDAY...Northeast wind up to 30 knots easing to 15 to 20 knots
with gusts to around 30 knots late in the afternoon. Slight
chance of drizzle and light freezing drizzle in the morning.
Slight chance of snow showers through the day. Waves 3 to 5 feet
building to 4 to 7 feet in the late morning and afternoon. Waves
occasionally to 9 feet. A gale warning may be needed.
.SUNDAY NIGHT...Northeast wind 10 to 15 knots easing to 5 knots
late in the evening, then becoming northwest after midnight.
Mostly clear. Waves 2 to 4 feet subsiding to 2 feet or less in
the late evening and overnight.

Note...Wave height forecasts are for ice free areas.

$$

Melde

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 231343
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
943 AM EDT Sat Mar 23 2019

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 over the western Great Lakes will
reach the Ohio River Valley this afternoon and move off the east
Coast by Sunday morning. A low pressure trough of 30.0 inches will
pass across Lake Superior briefly late tonight into Sunday
morning before giving way to a strong 30.5 inch ridge moving into
the Northern Plains and Upper Mississippi Valley by Monday
morning. The high will cross the Great Lakes through Tuesday
before exiting the east coast late Wednesday. A low pressure
trough of 29.6 inches will approach the Upper Great Lakes from the
northern Plains by Wednesday night.

LSZ162-232145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
943 AM EDT Sat Mar 23 2019 /843 AM CDT Sat Mar 23 2019/

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming northeast 20 to 30 knots
late. A chance of drizzle after midnight. Waves subsiding to 1 to
3 feet.
.SUNDAY...Northeast winds 20 to 30 knots becoming east 15 to
25 knots late. A chance of drizzle, a slight chance of freezing
drizzle and snow showers through early afternoon. Freezing spray.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. Waves
building to 1 to 3 feet.
.WEDNESDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-232145-
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-
943 AM EDT Sat Mar 23 2019

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves 2 to
4 feet building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots after midnight, then veering northeast late. A chance of
drizzle, freezing drizzle and a slight chance of snow showers
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of freezing drizzle and a slight chance
of snow showers through early afternoon. Freezing spray. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 2 to 4 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. Waves
building to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-232145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
943 AM EDT Sat Mar 23 2019

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon. Waves 1 to 3 feet building to
4 to 7 feet occasionally to 9 feet.
.TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then becoming northeast to 30 knots with a few
gale force gusts to 35 knots possible late. A chance of drizzle,
freezing drizzle and a slight chance of snow showers after
midnight. Waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet.
.SUNDAY...Northeast winds to 30 knots with a few gale force gusts
to 35 knots possible diminishing to 15 to 25 knots in the
afternoon, then becoming north 10 to 20 knots late. A slight
chance of snow showers through early afternoon. Freezing spray.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-232145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
943 AM EDT Sat Mar 23 2019

.REST OF TODAY...West winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west after
midnight, then becoming north 20 to 30 knots late. A chance of
drizzle, freezing drizzle and a slight chance of snow showers
after midnight. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SUNDAY...Northeast winds to 30 knots with a few gale force gusts
to 35 knots possible diminishing to 20 to 30 knots in the
afternoon, then becoming north 15 to 25 knots late. A chance of
freezing drizzle and a slight chance of snow showers through
early afternoon. Freezing spray. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots. A chance of rain
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-232145-
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-
943 AM EDT Sat Mar 23 2019

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots after midnight, then veering north late. A slight chance
of drizzle, freezing drizzle and snow showers after midnight.
Waves subsiding to 2 to 4 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...Northeast winds 20 to 30 knots backing north in the
afternoon, then diminishing to 15 to 25 knots late. A chance of
freezing drizzle and a slight chance of snow showers through
early afternoon. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots. A chance of snow
showers. A chance of rain showers. Snow showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-232145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
943 AM EDT Sat Mar 23 2019

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots late.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then becoming north 20 to 30 knots late. A slight
chance of drizzle, freezing drizzle and snow showers after
midnight.
.SUNDAY...Northeast winds 15 to 25 knots backing north in the
afternoon. A slight chance of freezing drizzle and snow showers
through early afternoon.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots.
.MONDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon.
.MONDAY NIGHT...West winds 5 to 15 knots.
.TUESDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots.
.WEDNESDAY...South winds 15 to 25 knots. A chance of snow
showers, then rain showers, possibly mixed with snow.

Note, waves omitted for mostly ice covered areas.

$$
LSZ261-232145-
MAFOR 2315/
Superior West 13520 12530 11630 12140. Waves 2 to 5 feet this
afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.
Waves 5 to 8 feet Sunday morning.

Superior North Central 13530 12630 11750 11150 11140. Waves 2 to
4 feet building to 4 to 7 feet this afternoon. Waves 4 to 7 feet
subsiding to 3 to 6 feet tonight. Waves 5 to 8 feet Sunday
morning. Wave heights are for ice free areas.

Superior South Central 11610 12510 11520 11630 11640 11850 11141.
Waves 1 to 3 feet this afternoon. Waves 1 to 3 feet building to 3
to 5 feet tonight. Waves 3 to 6 feet Sunday morning.

Superior East 13510 11520 11530 11630 11840 11140. Waves 1 to 3
feet this afternoon. Waves 1 to 4 feet tonight. Waves 3 to 5
feet Sunday morning. Wave heights are for ice free areas.

$$

RJC

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

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

Other Information

Great Lakes Water Levels and Forecasts - Provided by USACE

GLERL - NOAA Great Lakes Forecast System

NOAA Marine Homepage