Alert archive / Puerto Rico / Flash Flood Warnings in 2011

Flash Flood Warning 24, NWS JSJ

May 20, 2011

NWS JSJ issued this flash flood warning at May 20, 2011, 4:01 PM CDT. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 20, 2011, 4:01 PM CDT (21:01 UTC)
Expired: May 20, 2011, 8:00 PM CDT
In force: 4 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 32 km from the middle of the area, began a volume at 21:00 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, in the capitals the NWS used until 2016.

458 
WGCA52 TJSJ 202101
FFWSJU
PRC029-031-087-139-210100-
/O.NEW.TJSJ.FF.W.0024.110520T2101Z-110521T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
501 PM AST FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     TRUJILLO ALTO
     CANOVANAS
     CAROLINA
     LOIZA

* UNTIL 900 PM AST

* AT 450 PM AST...LOCAL EMERGENCY MANAGEMENT AND LOCAL WATER 
AUTHORITY HAS ADVISED THAT ADDITIONAL GATES HAVE BEEN OPENED DURING 
THE PAST HOUR...EXPECT RAPID RISES IN THE LOWER RIO GRANDE DE LOIZA 
FROM TRUJILLO ALTO TO LOIZA. FLOODING CAN BE EXPECTED IN LOIZA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND
UNDERPASSES. ADDITIONALLY...ROADS AND LANDS ALONG THE BANKS OF
CREEKS...STREAMS AND OTHER LOW LYING AND POOR DRAINAGE AREAS ARE
SUBJECT TO FLOODING. MOTORISTS ARE URGED TO AVOID ROADS WHERE
EXCESSIVE PONDING IS OBSERVED.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 1829 6600 1830 6605 1849 6596 1847 6588
      1845 6588 1836 6593

$$

FC/RAM/AAS

ADDITIONAL INFORMATION CAN BE FOUND AT /USE LOWER CASE LETTERS/:
     HTTP://WWW.WEATHER.GOV/SANJUAN

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
May 19, 8:17 PM CDT	Areal Flood Advisory	JSJ	5 hr
May 20, 2:44 AM CDT	Flash Flood Watch	JSJ	24 hr
May 20, 7:21 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 8:38 AM CDT	Areal Flood Advisory	JSJ	11 hr
May 20, 8:59 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 9:33 AM CDT	Special Marine Warning	JSJ	87 min
May 20, 10:13 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 10:39 AM CDT	Flash Flood Warning	JSJ	12 hr
May 20, 11:43 AM CDT	Areal Flood Advisory	JSJ	5 hr
May 20, 12:19 PM CDT	Areal Flood Warning	JSJ	12 hr
May 20, 12:42 PM CDT	Flash Flood Warning	JSJ	6 hr
May 20, 12:54 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 2:09 PM CDT	Flash Flood Warning	JSJ	9 hr
May 20, 2:45 PM CDT	Flash Flood Warning	JSJ	3 hr
May 20, 2:46 PM CDT	Areal Flood Advisory	JSJ	10 hr
May 20, 4:36 PM CDT	Special Marine Warning	JSJ	54 min
May 20, 5:28 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 5:34 PM CDT	Special Marine Warning	JSJ	116 min
May 20, 5:55 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 6:08 PM CDT	Flash Flood Warning	JSJ	4 hr
May 20, 6:52 PM CDT	Areal Flood Advisory	JSJ	4 hr

Nearby

Flash Flood Warnings in Puerto Rico, 2011 Every flash flood warning in 2011

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.