Alert archive / Puerto Rico / Flash Flood Warnings in 2011

Flash Flood Warning 37, NWS JSJ

May 24, 2011

NWS JSJ issued this flash flood warning at May 24, 2011, 5:53 PM CDT. It was in force for 7 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 24, 2011, 5:53 PM CDT (22:53 UTC)
Expired: May 25, 2011, 12:49 AM CDT
In force: 7 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 38 km from the middle of the area, began a volume at 22:54 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.

005 
WGCA52 TJSJ 242253
FFWSJU
PRC051-135-137-250430-
/O.NEW.TJSJ.FF.W.0037.110524T2253Z-110525T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
653 PM AST TUE MAY 24 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     TOA ALTA
     DORADO
     TOA BAJA

* UNTIL 1230 AM AST

* AT 620 PM AST...THE PUERTO RICO WATER AUTHORITY INDICATED THAT 
THEY HAD OPENED AT LEAST TWO GATES IN THE COMERIO DAM AT NARANJITO. 
THIS SENT THE RIVER GAGE IN NARANJITO INTO FLOOD AT THE STAGE OF 
18.63 FEET AND THIS AMOUNT OF WATER IS EXPECTED TO CAUSE THE RIVER 
TO FLOOD IN TOA BAJA AS WELL.

FOR THE RIO DE LA PLATA NEAR TOA ALTA - TOAP4
     FLOOD STAGE - 16 FEET.
     AT 620 PM AST...THE USGS SENSOR INDICATED THE RIVER WAS STEADY  
     AT 3.76...BUT IS EXPECTED TO RISE BEFORE 7:30 PM AND FLOOD      
     AFTER 10 PM AST. MINOR FLOODING IS FORECAST.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

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 1841 6628 1848 6627 1847 6624 1841 6624
      1834 6622 1834 6626

$$

SNELL

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

2 follow-up statements

003 
WGCA52 TJSJ 250355
FFWSJU
PRC051-135-137-250700-
/O.EXT.TJSJ.FF.W.0037.000000T0000Z-110525T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
1155 PM AST TUE MAY 24 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     TOA ALTA
     DORADO
     TOA BAJA

* UNTIL 300 AM AST

* AT 1150 PM AST...THE USGS RIVER GAGE SENSOR AT RIO DE LA PLATA   
INDICATED THAT THE RIVER LEVEL WAS ABOVE FLOOD STAGE. FOR THAT 
REASON THE FLASH FLOOD WARNING FOR RIO DE LA PLATA AND ITS 
TRIBUTARIES HAS EXTENDED UNTIL 300 AM AST...WEDNESDAY MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 1841 6628 1848 6627 1847 6624 1841 6624
      1834 6622 1834 6626

$$

FIGUEROA

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

076 
WGCA72 TJSJ 250549
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
149 AM AST WED MAY 25 2011

PRC051-135-137-250554-
/O.CAN.TJSJ.FF.W.0037.000000T0000Z-110525T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TOA ALTA PR-DORADO PR-TOA BAJA PR-
149 AM AST WED MAY 25 2011

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

LATEST READINGS FROM THE USGS SENSOR AT THE RIO DE LA PLATA AT TOA 
ALTA...DORADO AND TOA BAJA INDICATE THAT THE RIVER CONTINUES TO 
SLOWLY RESEED. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

RESIDENTS AND MOTORISTS ACROSS THESE AREAS SHOULD HOWEVER BE ALERT 
TO PONDING OF WATER ON ROADWAYS AND ALLOW TIME FOR STREAMS...CREEKS 
AND RIVERS TO RETURN TO NORMAL LEVELS.

LAT...LON 1841 6628 1848 6627 1847 6624 1841 6624
      1834 6622 1834 6626

$$

FIGUEROA

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 23, 10:37 PM CDT	Areal Flood Warning	JSJ	4 hr
May 24, 1:36 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 2:15 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 3:24 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 4:07 PM CDT	Flash Flood Warning	JSJ	113 min
May 24, 4:36 PM CDT	Special Marine Warning	JSJ	39 min
May 24, 5:12 PM CDT	Flash Flood Warning	JSJ	10 hr
May 24, 6:04 PM CDT	Flash Flood Warning	JSJ	3 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.