Flash Flood Warning 25, NWS JSJ

Issued

May 20, 2011, 6:08 PM CDT (23:08 UTC)

Expired

May 20, 2011, 10:30 PM CDT

In force

4 hr

Issued by

NWS JSJ

Area

Storm-based polygon

Flood severity

None

The San Juan radar (TJUA), 35 km from the middle of the area, began a volume at 23:09 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.

511 
WGCA52 TJSJ 202308
FFWSJU
PRC051-135-137-210330-
/O.NEW.TJSJ.FF.W.0025.110520T2308Z-110521T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
708 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
     TOA ALTA
     DORADO
     TOA BAJA

* UNTIL 1130 PM AST

* AT 649 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
INTERMITTENT BANDS OF MODERATE SHOWERS...SOME OF THEM WITH EMBEDDED 
HEAVY DOWNPOURS...DEVELOPING AND MOVING ACROSS THE WARNED AREA.USGS 
SENSORS ARE ALSO INDICATING SIGNIFICANT RISES ALONG THE RIO DE LA 
PLATA RIVER FROM AIBONITO DOWNSTREAM TO TOA BAJA...THE UPSTREAM 
POINTS ARE SHOWING ANOTHER RISE TO A SECOND CREST. THIS ELEVATED 
FLOW WILL MAKE ITS WAY DOWNSTREAM TO TOA ALTA...TOA BAJA AND DORADO.

RESIDENTS IN FLOOD PRONE AREAS SHOULD MOVE TO HIGHER GROUND 
IMMEDIATELY AND NEVER TRY TO CROSS A FLOODED ROADWAY. IN 
ADDITION...MUDSLIDES ARE POSSIBLE OVER AREAS OF STEEP TERRAIN.

FOR THE RIO DE LA PLATA NEAR TOA ALTA - TOAP4
     FLOOD STAGE - 16 FEET.
     AT 649 PM AST...THE USGS SENSOR INDICATED THE RIVER HAD RISEN   
     TO 13.45 FEET AND RISING. MINOR FLOODING IS FORECAST.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM BANDS OF 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.

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. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART 
CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 1838 6628 1848 6628 1847 6622 1834 6620
      1833 6622 1833 6625

$$

AAS

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

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

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.