Alert archive / Puerto Rico / Flash Flood Warnings in 2012

Flash Flood Warning 28, NWS JSJ

August 4, 2012

NWS JSJ issued this flash flood warning at Aug 4, 2012, 5:56 PM CDT. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 4, 2012, 5:56 PM CDT (22:56 UTC)
Expired: Aug 4, 2012, 9:15 PM CDT
In force: 3 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 76 km from the middle of the area, began a volume at 22:56 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.

What was reported inside it

Time	Report	Where	Remark
Aug 4, 6:35 PM CDT	FLASH FLOOD	Ponce, PR	2 STRANDED VEHICLES...WITH PEOPLE INSIDE...ON ROAD 123 DUE TO FLOOD WATERS FROM A SMALL STREAM THAT WENT OUT OF ITS BANKS AND FLOODED THE ROAD.
Aug 4, 7:00 PM CDT	HEAVY RAIN 0	Ponce, PR	HEAVY RAIN CAUSED A MUDSLIDE ON ROAD NUMBER 2 RIGHT NEXT TO LAS CUCHARAS SECTOR. 1 PERSON INSIDE A VEHICLE WAS REPORTED TO BE STRANDED.
Aug 4, 7:40 PM CDT	HEAVY RAIN 5.3	Penuelas, PR	PENUELAS OBSERVER REPORTED 5.30 INCHES OF RAIN SO FAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The text

As transmitted, in the capitals the NWS used until 2016.

603 
WGCA52 TJSJ 042256
FFWSJU
PRC055-059-111-113-121-153-050045-
/O.NEW.TJSJ.FF.W.0028.120804T2256Z-120805T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
656 PM AST SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     GUANICA
     GUAYANILLA
     PENUELAS
     PONCE
     SABANA GRANDE
     YAUCO

* UNTIL 845 PM AST

* AT 646 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR AS WELL AS 
LOCAL EMERGENCY MANAGERS INDICATED THAT HEAVY RAIN CONTINUED TO FALL 
ACROSS THESE AREAS. RIVERS AND STREAMS WILL QUICKLY REACT AND WATERS 
WILL RISE RAPIDLY AND CONTINUE TO FLOOD THE SURROUNDING AREAS WITHIN 
THE WARNED AREA.

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.

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. 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. TO ESCAPE 
RISING WATER MOVE UP TO HIGHER GROUND.

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 1798 6693 1810 6693 1811 6659 1799 6658
      1798 6676 1799 6677 1798 6679

$$
RAM


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

2 follow-up statements

524 
WGCA52 TJSJ 050039
FFWSJU
PRC055-059-111-113-121-153-050215-
/O.EXT.TJSJ.FF.W.0028.000000T0000Z-120805T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
839 PM AST SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     GUANICA
     GUAYANILLA
     PENUELAS
     PONCE
     SABANA GRANDE
     YAUCO

* UNTIL 1015 PM AST

* AT 829 PM AST...DOPPLER WEATHER RADAR AND LOCAL EMERGENCY MANAGER 
CONTINUED TO INDICATE THAT SHOWERS AND THUNDERSTORMS WITH VERY HEAVY 
RAIN CONTINUED TO MOVE ACROSS THE WARNED AREA. IN ADDITION...
THE USGS RIVER SENSOR ALONG THE GUAYANILLA RIVER HAD INDICATED THAT 
THE WATER LEVEL CONTINUED TO RISE. 

EXCESSIVE RUNOFF FROM THE 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.

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 THE 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. 

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. 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. TO ESCAPE 
RISING WATER MOVE UP TO HIGHER GROUND.

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 1798 6693 1810 6693 1811 6659 1799 6658
      1798 6676 1799 6677 1798 6679

$$

RAM

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

707 
WGCA72 TJSJ 050214
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1014 PM AST SAT AUG 4 2012

PRC055-059-111-113-121-153-050230-
/O.EXP.TJSJ.FF.W.0028.000000T0000Z-120805T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUANICA PR-GUAYANILLA PR-PENUELAS PR-PONCE PR-SABANA GRANDE PR-
YAUCO PR-
1014 PM AST SAT AUG 4 2012

...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 1015 PM AST 
FOR YAUCO...SABANA GRANDE...PONCE...PENUELAS...GUAYANILLA AND 
GUANICA MUNICIPALITIES...

DOPPLER RADAR INDICATED THAT THE HEAVY RAIN WHICH AFFECTED THIS AREA
HAD DISSIPATED OR MOVED AWAY. NO SIGNIFICANT ADDITIONAL RAINFALL IS 
EXPECTED ACROSS THESE AREAS AT THIS TIME. THEREFORE...THE FLASH 
FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 1015 PM AST.

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

LAT...LON 1798 6693 1810 6693 1811 6659 1799 6658
      1798 6676 1799 6677 1798 6679

$$

RAM

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
Aug 4, 12:16 AM CDT	Special Marine Warning	JSJ	44 min
Aug 4, 1:24 PM CDT	Areal Flood Advisory	JSJ	3 hr
Aug 4, 3:02 PM CDT	Areal Flood Advisory	JSJ	118 min
Aug 4, 4:11 PM CDT	Areal Flood Advisory	JSJ	109 min

Nearby

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

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; radar from the NEXRAD Level II archive.