406 

WHCA52 TJSJ 180824

SMWSJU

AMZ711-716-726-180915-

/O.NEW.TJSJ.MA.W.0060.251018T0824Z-251018T0915Z/



BULLETIN - IMMEDIATE BROADCAST REQUESTED

Special Marine Warning

National Weather Service San Juan PR

424 AM AST Sat Oct 18 2025



The National Weather Service in San Juan has issued a



* Special Marine Warning for...

  Atlantic Waters of Puerto Rico AND USVI from 10 NM to 19.5N...

  Coastal Waters east of Puerto Rico, around Vieques, and around and

  just north of Culebra and Saint John...

  Coastal Waters from Cabo San Juan to the waters between Anegada

  Island and Virgin Gorda and North 10 NM...



* Until 515 AM AST.



* At 424 AM AST, a severe thunderstorm capable of producing 

  waterspouts was located over St Thomas, moving northeast at 20 

  knots.



  HAZARD...Waterspouts and wind gusts 34 knots or greater.



  SOURCE...Radar.



  IMPACT...Waterspouts can easily overturn boats and create locally 

           hazardous seas. Small craft could be damaged in briefly 

           higher winds and suddenly higher waves.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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

expected.



Seek safe shelter, mariners can expect gusty winds and increasing

waves.



Thunderstorms can produce sudden waterspouts. Waterspouts can easily

overturn boats and create locally hazardous seas. Seek safe harbor

immediately.



Frequent lightning is occurring with this storm. If caught on the

open water stay below deck if possible, keep away from ungrounded

metal objects.



Report severe weather to the Coast Guard or the National Weather

Service.



&&



LAT...LON 1870 6444 1836 6473 1837 6475 1834 6480

      1831 6479 1832 6477 1827 6480 1804 6500

      1800 6514 1826 6536 1833 6534 1829 6526

      1831 6525 1834 6533 1899 6511

TIME...MOT...LOC 0824Z 226DEG 31KT 1845 6499 



WATERSPOUT...POSSIBLE

HAIL...0.00IN

WIND...>34KTS



$$



CVB






633 

WGCA52 TJSJ 180842

FFWSJU

VIC030-181045-

/O.NEW.TJSJ.FF.W.0090.251018T0842Z-251018T1045Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/



BULLETIN - EAS ACTIVATION REQUESTED

Flash Flood Warning

National Weather Service San Juan PR

442 AM AST Sat Oct 18 2025



The National Weather Service in San Juan has issued a



* Flash Flood Warning for...

  Saint Thomas in Virgin Islands...



* Until 645 AM AST.



* At 442 AM AST, Doppler radar indicated thunderstorms producing 

  heavy rain across the warned area. Between 2 and 3 inches of rain 

  have fallen. Additional rainfall amounts of 1 to 3 inches are 

  possible in the warned area. Flash flooding is ongoing or expected 

  to begin shortly.



  HAZARD...Life threatening flash flooding. Thunderstorms

           producing flash flooding.



  SOURCE...Radar.



  IMPACT...Life threatening flash flooding of creeks and streams,

           urban areas, highways, streets and underpasses.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Turn around, don't drown when encountering flooded roads. Most flood 

deaths occur in vehicles.



Be especially cautious at night when it is harder to recognize the 

dangers of flooding.



Please report observed flooding to local emergency services or law 

enforcement and request they pass this information to the National 

Weather Service when you can do so safely.



&&



LAT...LON 1838 6495 1837 6492 1833 6484 1832 6485

      1832 6483 1831 6485 1832 6488 1831 6488

      1830 6488 1832 6492 1834 6493 1832 6496

      1835 6499 1835 6504



FLASH FLOOD...RADAR INDICATED

FLASH FLOOD DAMAGE THREAT...CONSIDERABLE



$$



CVB