Alert archive / Puerto Rico / Special Marine Warnings in 2021

Special Marine Warning 21, NWS JSJ

July 25, 2021

NWS JSJ issued this special marine warning at Jul 25, 2021, 5:42 PM CDT. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 25, 2021, 5:42 PM CDT (22:42 UTC)
Expired: Jul 25, 2021, 6:30 PM CDT
In force: 48 min
Issued by: NWS JSJ
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The San Juan radar (TJUA), 153 km from the middle of the area, began a volume at 22:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

As transmitted.

957 
WHCA52 TJSJ 252242
SMWSJU
AMZ725-732-252330-
/O.NEW.TJSJ.MA.W.0021.210725T2242Z-210725T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service San Juan PR
642 PM AST Sun Jul 25 2021

The National Weather Service in San Juan has issued a

* Special Marine Warning for...
  Caribbean Waters of Puerto Rico from 10 NM to 17N...
  Coastal Waters of Southern USVI, Vieques, and Eastern Puerto Rico
  out 10 NM...

* Until 730 PM AST.

* At 635 PM AST, a severe thunderstorm capable of producing 
  waterspouts was located over the Anegada Passage about 20 miles 
  southeast of Saint John, moving northwest at 15 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.

* The severe thunderstorm will remain over mainly open waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

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 1796 6450 1821 6492 1832 6476 1832 6472
      1830 6471 1832 6470 1835 6472 1836 6470
      1847 6456 1812 6426
TIME...MOT...LOC 2235Z 116DEG 14KT 1813 6444 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...>34KTS

$$

ICP

1 follow-up statement

303 
FZCA72 TJSJ 252322
MWSSJU

Marine Weather Statement
National Weather Service San Juan PR
722 PM AST Sun Jul 25 2021

AMZ725-732-252331-
/O.EXP.TJSJ.MA.W.0021.000000T0000Z-210725T2330Z/
722 PM AST Sun Jul 25 2021

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 730 PM AST...

The affected areas were... 
Caribbean Waters of Puerto Rico from 10 NM to 17N...
Coastal Waters of Southern USVI, Vieques, and Eastern Puerto Rico out
10 NM...

The thunderstorm has weakened and no longer poses a significant
threat to boaters.

LAT...LON 1796 6450 1821 6492 1832 6476 1832 6472
      1830 6471 1832 6470 1835 6472 1836 6470
      1847 6456 1812 6426
TIME...MOT...LOC 2321Z 116DEG 14KT 1820 6458 

$$

FRG

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Jul 25, 12:19 PM CDT	Areal Flood Advisory	JSJ	3 hr
Jul 25, 12:24 PM CDT	Areal Flood Advisory	JSJ	111 min
Jul 25, 12:50 PM CDT	Areal Flood Advisory	JSJ	2 hr
Jul 25, 1:05 PM CDT	Areal Flood Advisory	JSJ	3 hr
Jul 25, 1:19 PM CDT	Special Weather Statement	JSJ	41 min
Jul 25, 3:07 PM CDT	Areal Flood Advisory	JSJ	113 min
Jul 25, 3:52 PM CDT	Special Marine Warning	JSJ	53 min

Nearby

Special Marine Warnings in Puerto Rico, 2021 Every special marine warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.