321 

WHUS53 KDLH 172117
SMWDLH
LSZ121-140>142-146>148-150-162-172215-
/O.NEW.KDLH.MA.W.0004.260417T2117Z-260417T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Duluth MN
417 PM CDT Fri Apr 17 2026

The National Weather Service in Duluth MN has issued a

* Special Marine Warning for...
  Chequamegon Bay-Bayfield to Oak Point WI...
  Grand Marais to Taconite Harbor MN...
  Grand Portage to Grand Marais MN...
  Lake Superior west of a line from Saxon Harbor WI to Grand Portage
  MN beyond 5NM...
  Oak Point to Saxon Harbor WI...
  Outer Apostle Islands Beyond 5 NM from Mainland...
  Port Wing to Sand Island WI...
  Sand Island to Bayfield WI...
  Taconite Harbor to Silver Bay Harbor MN...

* Until 515 PM CDT.

* At 417 PM CDT, strong thunderstorms were located along a line
  extending from 9 nm southeast of Mouth Of The Cross River to 8 nm
  southeast of Oak Point, moving northeast at 45 knots.

  HAZARD...Wind gusts 34 knots or greater and small hail.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and
           suddenly higher waves.

* Locations impacted include...
  Ashland Breakwater Lighthouse, Ironwood Island, Basswood Island,
  Sand Island, Stockton Island, Madeline Island, Devils Island, Cat
  Island, Manitou Island, North Twin Island, York Island, Apostle
  Islands National Lake Shore, La Pointe, Outer Island, Michigan
  Island, Rocky Island, Raspberry Island, Marble Point, Oak Point,
  and Oak Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

Frequent lightning is occurring with these storms. If caught on the
open water stay below deck if possible, keep away from ungrounded
metal objects.

&&

LAT...LON 4657 9097 4667 9094 4670 9089 4676 9092
      4690 9080 4693 9086 4689 9101 4737 9103
      4800 8951 4791 8950 4786 8964 4666 9044
      4660 9044 4657 9058 4664 9071 4656 9092
TIME...MOT...LOC 2117Z 242DEG 47KT 4743 9073 4655 9063

HAIL...<.75IN
WIND...>34KTS

$$

PA






536 

WHUS53 KMQT 172126
SMWMQT
LSZ240>242-263-172230-
/O.NEW.KMQT.MA.W.0001.260417T2126Z-260417T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Marquette MI
526 PM EDT Fri Apr 17 2026

The National Weather Service in Marquette has issued a

* Special Marine Warning for...
  Black River To Ontonagon MI...
  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...
  Ontonagon to Upper Entrance of Portage Canal MI...
  Saxon Harbor WI to Black River MI...

* Until 630 PM EDT.

* At 525 PM EDT, strong thunderstorms were located along a line
  extending from 15 nm southeast of Tofte Safe Harbor to 12 nm east
  of Oak Island to 30 nm south of Ashland Breakwater Lighthouse,
  moving east at 60 knots.

  HAZARD...Wind gusts 34 knots or greater and small hail.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and
           suddenly higher waves.

* Locations impacted include...
  The Western Lake Superior Buoy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4729 9003 4758 8900 4702 8885 4697 8894
      4695 8910 4682 8934 4678 8976 4662 9004
      4654 9038 4656 9044 4666 9045
TIME...MOT...LOC 2125Z 263DEG 58KT 4738 9058 4692 9036 4612 9088

HAIL...<.75IN
WIND...>34KTS

$$

GS






960 

WHUS53 KMQT 172139
SMWMQT
LSZ263-172245-
/O.NEW.KMQT.MA.W.0002.260417T2139Z-260417T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Marquette MI
539 PM EDT Fri Apr 17 2026

The National Weather Service in Marquette has issued a

* Special Marine Warning for...
  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...

* Until 645 PM EDT.

* At 539 PM EDT, a strong thunderstorm was located 16 nm south of
  Grand Marais Harbor, or 17 nm northwest of The Western Lake
  Superior Buoy, moving northeast at 45 knots.

  HAZARD...Wind gusts 34 knots or greater and small hail.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and
           suddenly higher waves.

* Locations impacted include...
  Rock of Ages Light and The Western Lake Superior Buoy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4786 8964 4788 8955 4793 8946 4799 8941
      4797 8934 4755 8908 4726 9004
TIME...MOT...LOC 2139Z 238DEG 47KT 4748 9021

HAIL...<.75IN
WIND...>34KTS

$$

GS