Flash Flood Warning 4, NWS JSJ

Issued

Mar 23, 2012, 3:00 AM CDT (08:00 UTC)

Expired

Mar 23, 2012, 5:00 AM CDT

In force

2 hr

Issued by

NWS JSJ

Area

Storm-based polygon

Flood severity

None

The San Juan radar (TJUA), 38 km from the middle of the area, began a volume at 07:59 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.

320 
WGCA52 TJSJ 230800
FFWSJU
PRC033-051-127-137-143-145-231000-
/O.NEW.TJSJ.FF.W.0004.120323T0800Z-120323T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
400 AM AST FRI MAR 23 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     SAN JUAN
     VEGA ALTA
     VEGA BAJA
     DORADO
     TOA BAJA
     CATANO

* UNTIL 600 AM AST

* AT 350 AM AST...NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR 
INDICATED A LINE OF STRONG THUNDERSTORMS WITH VERY HEAVY RAINFALL 
MOVING INLAND ACROSS THE WARNED AREA. THESE STORMS ARE CAPABLE OF 
PRODUCING HOURLY RAINFALL RATES BETWEEN ONE INCH TO TWO INCHES.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF 
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN 
AROUND...DONT DROWN...OR MOVE TO HIGHER GROUND. 

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. NEVER TRY TO CROSS A FLOWING 
STREAM...EVEN A SMALL ONE...ON FOOT. 

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 1848 6617 1846 6617 1847 6615 1846 6604
      1843 6603 1840 6599 1841 6610 1844 6611
      1842 6613 1843 6617 1841 6620 1842 6642
      1850 6643

$$

RAM

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

028 
WGCA72 TJSJ 231004
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
604 AM AST FRI MAR 23 2012

PRC033-051-127-137-143-145-231005-
/O.EXP.TJSJ.FF.W.0004.000000T0000Z-120323T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN PR-VEGA ALTA PR-VEGA BAJA PR-DORADO PR-TOA BAJA PR-CATANO 
604 AM AST FRI MAR 23 2012

...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 600 AM AST 
FOR CATANO...TOA BAJA...DORADO...VEGA BAJA...VEGA ALTA AND SAN JUAN 
MUNICIPALITIES...

AT 5:55 AM AST...THE DOPPLER WEATHER RADAR INDICATED THAT THE HEAVY 
RAIN ACCOMPANYING A SOLID LINE OF SHOWERS AND THUNDERSTORMS WHICH 
AFFECTED THIS AREA HAD DISSIPATED AND MOVED AWAY. NO SIGNIFICANT 
ADDITIONAL RAINFALL IS EXPECTED ACROSS THESE AREAS AT THIS TIME
AND FLASH FLOODING IS NO LONGER IMMINENT. THEREFORE THE FLASH FLOOD 
WARNING HAS BEEN ALLOWED TO EXPIRE. RESIDENTS AND MOTORIST 
TRANSITING ACROSS THE PREVIOUSLY WARNED AREAS SHOULD HOWEVER 
EXERCISE CAUTION...BE ALERT TO PONDING OF WATER ON ROADWAYS...AND 
ALLOW TIME FOR SMALL RIVERS AND STREAMS TO RETURN TO NORMAL LEVELS. 
  

LAT...LON 1848 6617 1846 6617 1847 6615 1846 6604
      1843 6603 1840 6599 1841 6610 1844 6611
      1842 6613 1843 6617 1841 6620 1842 6642
      1850 6643

$$

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

Flash Flood Warnings in Puerto Rico, 2012Every flash flood warning in 2012

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.