Alert archive / Puerto Rico / Flash Flood Warnings in 2014

Flash Flood Warning 3, NWS JSJ

May 10, 2014

NWS JSJ issued this flash flood warning at May 10, 2014, 7:55 AM CDT. It was in force for 110 min. 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 10, 2014, 7:55 AM CDT (12:55 UTC)
Expired: May 10, 2014, 9:45 AM CDT
In force: 110 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 36 km from the middle of the area, began a volume at 12:58 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.

227 
WGCA52 TJSJ 101255
FFWSJU
PRC031-087-127-139-101445-
/O.NEW.TJSJ.FF.W.0003.140510T1255Z-140510T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
855 AM AST SAT MAY 10 2014

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     SAN JUAN
     TRUJILLO ALTO
     CAROLINA
     LOIZA

* UNTIL 1045 AM AST

* AT 849 AM AST...THE DOPPLER WEATHER RADAR AS WELL AS THE EMERGENCY 
MANAGERS AND THE LOCAL PUBLIC REPORTED HEAVY RAINS AND STRONG 
THUNDERSTORMS MOVING TOWARDS OR OVER THE WARNED AREA.

* THE NATIONAL WEATHER SERVICE HAS UPGRADED FROM AN URBAN AND SMALL
  STREAM FLOOD ADVISORY TO A FLASH FLOOD WARNING FOR THESE AREAS.
  THE UPGRADE TO A WARNING MEANS FLOODING IS IMMINENT OR OCCURRING
  IN THE WARNED AREA.

FOR THE RIO PIEDRAS NEAR HATO REY- RPOP4
     FLOOD STAGE - 15 FEET.
     AT 849 AM AST THE USGS SENSOR INDICATED THE RIVER HAD QUICKLY   
    RISEN TO...
    12.35 FEET AND CONTINUE TO RISE.
     MINOR TO MODERATE 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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SAN
JUAN.

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.

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.

&&

LAT...LON 1846 6596 1845 6591 1841 6592 1833 6599
      1834 6605 1845 6603 1845 6601 1847 6599
      1847 6598

$$

RAM

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

1 follow-up statement

173 
WGCA72 TJSJ 101451
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1051 AM AST SAT MAY 10 2014

PRC031-087-127-139-101500-
/O.EXP.TJSJ.FF.W.0003.000000T0000Z-140510T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN PR-TRUJILLO ALTO PR-CAROLINA PR-LOIZA PR-
1051 AM AST SAT MAY 10 2014

...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 1045 AM AST 
FOR LOIZA...CAROLINA...TRUJILLO ALTO AND SAN JUAN MUNICIPALITIES...

FOR THE RIO PIEDRAS NEAR HATO REY- RPOP4
     FLOOD STAGE - 15 FEET.
     AT 1036 AM AST THE USGS SENSOR INDICATED THE WATER LEVELS
     HAVE BEGUN TO SUBSIDE TO...
     9.76 FEET.
    
  THE HEAVY RAIN HAS ENDED OVER THE AREA AND ONLY LIGHT              
  TO MODERATE RAIN IS OCCURRING AT THIS TIME. NO MAJOR FLOODING      
  IS EXPECTED...AND THEREFORE FLASH FLOOD WARNING WAS ALLOWED TO     
  EXPIRE. HOWEVER DUE TO THE CONTINUED LIGHT TO MODERATE RAINS       
  AND RUNOFF FROM THE RECENT HEAVY RAINFALL...AN URBAN AND           
  SMALL STREAM ADVISORY WILL REMAIN IN EFFECT FOR THESE AREAS AT     
  LEAST UNTIL 1145 AM. 

LAT...LON 1846 6596 1845 6591 1841 6592 1833 6599
      1834 6605 1845 6603 1845 6601 1847 6599
      1847 6598

$$

RAM/JJA/DS

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 10, 5:45 AM CDT	Areal Flood Advisory	JSJ	5 hr
May 10, 5:48 AM CDT	Areal Flood Advisory	JSJ	5 hr
May 10, 6:30 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 10, 7:55 AM CDT	Flash Flood Warning	JSJ	5 hr
May 10, 8:16 AM CDT	Areal Flood Advisory	JSJ	119 min
May 10, 9:27 AM CDT	Areal Flood Advisory	JSJ	6 hr
May 10, 10:47 AM CDT	Areal Flood Advisory	JSJ	118 min
May 10, 10:51 AM CDT	Areal Flood Advisory	JSJ	114 min

Nearby

Flash Flood Warnings in Puerto Rico, 2014 Every flash flood warning in 2014

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.