Alert archive / Puerto Rico / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS JSJ

May 21, 2021

NWS JSJ issued this severe thunderstorm warning at May 21, 2021, 12:38 PM CDT. It was in force for 37 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 21, 2021, 12:38 PM CDT (17:38 UTC)
Expired: May 21, 2021, 1:15 PM CDT
In force: 37 min
Issued by: NWS JSJ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

The radar

The San Juan radar (TJUA), 48 km from the middle of the area, began a volume at 17:39 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.

What was reported inside it

Time	Report	Where	Remark
May 21, 12:45 PM CDT	TSTM WND DMG	Morovis, PR	A SEVERE THUNDERSTORM MOVE ACROSS THE MUNICIPALITY OF MOROVIS GENERATING STRONG GUSTY WINDS ACROSS THE MUNICIPALITY.SEVERAL TREES AND ELECTRICAL POLES WERE KNOCKED DOWN BY THE WINDS ALONG ROADS PR-633, 155, 159, AND 567.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The text

As transmitted.

490 
WUCA52 TJSJ 211738
SVRSJU
PRC039-091-101-145-211815-
/O.NEW.TJSJ.SV.W.0001.210521T1738Z-210521T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service San Juan PR
138 PM AST Fri May 21 2021

The National Weather Service in San Juan has issued a

* Severe Thunderstorm Warning for...
  Vega Baja Municipality in Puerto Rico...
  Morovis Municipality in Puerto Rico...
  Ciales Municipality in Puerto Rico...
  Manati Municipality in Puerto Rico...

* Until 215 PM AST

* At 137 PM AST, a severe thunderstorm was located over 
  Morovis moving north at 5 mph.

  HAZARD...50-60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 


PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 1848 6635 1843 6635 1842 6636 1835 6638
      1833 6637 1827 6640 1826 6644 1830 6654
      1848 6650 1847 6645 1849 6644 1849 6639
      1848 6638 1849 6638
TIME...MOT...LOC 1737Z 192DEG 9KT 1834 6645 

HAIL...0.75IN
WIND...60MPH
 
$$

ER

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
May 21, 12:17 PM CDT	Special Weather Statement	JSJ	28 min
May 21, 12:29 PM CDT	Special Weather Statement	JSJ	16 min
May 21, 12:52 PM CDT	Special Weather Statement	JSJ	23 min
May 21, 1:11 PM CDT	Areal Flood Advisory	JSJ	87 min
May 21, 1:14 PM CDT	Severe Thunderstorm Warning	JSJ	31 min
May 21, 1:46 PM CDT	Special Weather Statement	JSJ	29 min

Nearby

Severe Thunderstorm Warnings in Puerto Rico, 2021 Every severe thunderstorm 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; local storm reports from the same archive; radar from the NEXRAD Level II archive.