783 

WHCA72 TJSJ 200803

MWWSJU



URGENT - MARINE WEATHER MESSAGE

National Weather Service San Juan PR

403 AM AST Wed May 20 2026



AMZ711-201615-

/O.EXT.TJSJ.SC.Y.0018.000000T0000Z-260521T2200Z/

Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-

403 AM AST Wed May 20 2026



...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM AST THURSDAY...



* WHAT...East winds 15 to 20 kt with gusts up to 30 kt and seas 

  6 to 7 ft.



* WHERE...Atlantic Waters of Puerto Rico and USVI from 10 NM to 

  19.5N.



* WHEN...Until 6 PM AST Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$






584 

WHUS73 KIWX 200810

MWWIWX



URGENT - MARINE WEATHER MESSAGE

National Weather Service Northern Indiana

410 AM EDT Wed May 20 2026



LMZ043-046-201615-

/O.NEW.KIWX.SC.Y.0042.260520T1200Z-260521T0600Z/

New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI-

410 AM EDT Wed May 20 2026



...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM THIS MORNING TO 2 AM

EDT THURSDAY...



* WHAT...Northerly wind gusts up to 25 knots. Waves 3 to 5 feet 

  expected.



* WHERE...Michigan City IN to St Joseph MI.



* WHEN...From 8 AM this morning to 2 AM EDT Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



Andersen






739 

WHUS73 KGRR 200814

MWWGRR



URGENT - MARINE WEATHER MESSAGE

National Weather Service Grand Rapids MI

414 AM EDT Wed May 20 2026



LMZ844>846-201615-

/O.NEW.KGRR.SC.Y.0036.260520T1700Z-260521T0600Z/

St Joseph to South Haven MI-South Haven to Holland MI-

Holland to Grand Haven MI-

414 AM EDT Wed May 20 2026



...SMALL CRAFT ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO

2 AM EDT THURSDAY...



* WHAT...North winds 10 to 20 knots with gusts up to 25 knots 

  and waves 2 to 5 feet expected.



* WHERE...St Joseph to Grand Haven.



* WHEN...From 1 PM this afternoon to 2 AM EDT Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



* ADDITIONAL DETAILS...Waves will be on the increase this

  afternoon as winds pick up out of the north. For a time this

  afternoon and evening winds will reach the 15 to 25 knot range.

  Waves will build to 3 to 5 feet, peaking around 600 pm. 



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



DUKE






376 

WHUS73 KLOT 200829

MWWLOT



URGENT - MARINE WEATHER MESSAGE

National Weather Service Chicago IL

329 AM CDT Wed May 20 2026



LMZ740>742-201630-

/O.EXT.KLOT.SC.Y.0060.260520T1500Z-260521T1800Z/

Winthrop Harbor to Wilmette Harbor IL-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

329 AM CDT Wed May 20 2026



...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 10 AM THIS MORNING TO

1 PM CDT THURSDAY...



* WHAT...Northeast winds to 25 kt and significant waves to 6 ft 

  occasionally to 8 ft expected.



* WHERE...Winthrop Harbor to Calumet Harbor IL.



* WHEN...From 10 AM this morning to 1 PM CDT Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



LMZ743>745-201630-

/O.EXT.KLOT.SC.Y.0060.260520T1200Z-260521T1200Z/

Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-

Burns Harbor to Michigan City IN-

329 AM CDT Wed May 20 2026



...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 7 AM THIS MORNING TO

7 AM CDT THURSDAY...



* WHAT...Northeast winds to 25 kt and significant waves to 6 ft 

  occasionally to 8 ft expected.



* WHERE...Calumet Harbor IL to Michigan City IN.



* WHEN...From 7 AM this morning to 7 AM CDT Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$