Alert archive / Puerto Rico / Flash Flood Warnings in 2011

Flash Flood Warning 29, NWS JSJ

May 20, 2011

NWS JSJ issued this flash flood warning at May 20, 2011, 11:47 PM CDT. It was in force for 5 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, 11:47 PM CDT (04:47 UTC)
Expired: May 21, 2011, 4:51 AM CDT
In force: 5 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 46 km from the middle of the area, began a volume at 04:50 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.

879 
WGCA52 TJSJ 210447
FFWSJU
PRC143-145-211045-
/O.NEW.TJSJ.FF.W.0029.110521T0447Z-110521T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
1247 AM AST SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     VEGA ALTA
     VEGA BAJA

* UNTIL 645 AM AST

* AT 1230 AM AST...A USGS SENSOR AT THE CIBUCO RIVER IN VEGA BAJA 
INDICATED THE RIVER AT 15.07 FEET AND RISING. LATEST INDICATIONS ARE 
THAT RIVER WILL CREST NEAR 16.5 FEET. AT 16 FEET...HIGHWAY 2 IN VEGA 
BAJA FLOODS AS WELL AS ROUTES 675...676...160...686...687 AND 689 IN 
VEGA ALTA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 1839 6646 1851 6644 1850 6632 1842 6629
      1839 6629 1833 6636

$$

ROSA

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

2 follow-up statements

936 
WGCA72 TJSJ 210748
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
348 AM AST SAT MAY 21 2011

PRC143-145-211045-
/O.CON.TJSJ.FF.W.0029.000000T0000Z-110521T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VEGA ALTA PR-VEGA BAJA PR-
348 AM AST SAT MAY 21 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 AM AST FOR VEGA
BAJA AND VEGA ALTA MUNICIPALITIES...

AT 330 AM AST...A USGS SENSOR AT THE CIBUCO RIVER IN VEGA BAJA 
INDICATED THAT THE RIVER HAD FALLEN BELOW FLOOD STAGE. 
HOWEVER...WATERS ARE TYPICALLY VERY SLOW TO RECEDE IN VEGA ALTA. 
MOTORISTS DRIVING ACROSS HIGHWAY 2 IN VEGA ALTA AND OTHER FLOOD 
PRONE AREAS IN VEGA ALTA SHOULD USE EXTREME CAUTION AND ALLOW TIME 
FOR THE RIVER AND ITS TRIBUTARIES TO RETURN TO NORMAL LEVELS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 1839 6646 1851 6644 1850 6632 1842 6629
      1839 6629 1833 6636

$$

ROSA

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

019 
WGCA72 TJSJ 210951
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
551 AM AST SAT MAY 21 2011

PRC143-145-211000-
/O.CAN.TJSJ.FF.W.0029.000000T0000Z-110521T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VEGA ALTA PR-VEGA BAJA PR-
551 AM AST SAT MAY 21 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR VEGA BAJA AND VEGA
ALTA MUNICIPALITIES...

LATEST READINGS FROM THE USGS SENSOR AT THE CIBUCO RIVER AT VEGA 
BAJA INDICATE THAT THE RIVER CONTINUES TO FALL RAPIDLY. 
THEREFORE...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 1839 6646 1851 6644 1850 6632 1842 6629
      1839 6629 1833 6636

$$

ROSA

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 20, 7:18 PM CDT	Areal Flood Advisory	JSJ	5 hr
May 20, 7:32 PM CDT	Areal Flood Advisory	JSJ	6 hr
May 20, 8:06 PM CDT	Flash Flood Warning	JSJ	4 hr
May 20, 8:07 PM CDT	Flash Flood Warning	JSJ	4 hr
May 20, 8:35 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 20, 10:30 PM CDT	Areal Flood Warning	JSJ	5 hr
May 20, 11:01 PM CDT	Areal Flood Advisory	JSJ	119 min
May 21, 12:51 AM CDT	Flash Flood Warning	JSJ	6 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.