Alert archive / Puerto Rico / Flash Flood Warnings in 2012

Flash Flood Warning 34, NWS JSJ

October 17, 2012

NWS JSJ issued this flash flood warning at Oct 17, 2012, 5:20 PM CDT. It was in force for 2 hr. 2 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: Oct 17, 2012, 5:20 PM CDT (22:20 UTC)
Expired: Oct 17, 2012, 7:45 PM CDT
In force: 2 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 33 km from the middle of the area, began a volume at 22:24 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
Oct 17, 5:50 PM CDT	HEAVY RAIN 0	Toa Alta, PR	A FALLEN TREE WAS REPORTED AT ROAD PR-165 BETWEEN DORADO AND TOA ALTA MUNICIPALITIES.
Oct 17, 6:45 PM CDT	FLASH FLOOD	Toa Alta, PR	SEVERAL HOUSES WERE REPORTED FLOODED AT TOA ALTA HIGH.

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.

668 
WGCA52 TJSJ 172220
FFWSJU
PRC021-051-061-135-137-143-145-180045-
/O.NEW.TJSJ.FF.W.0034.121017T2220Z-121018T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
620 PM AST WED OCT 17 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     BAYAMON
     GUAYNABO
     VEGA ALTA
     VEGA BAJA
     DORADO
     TOA ALTA
     TOA BAJA

* UNTIL 845 PM AST

* AT 612 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
CLUSTER OF STRONG THUNDERSTORMS AFFECTING THE WARNED AREA. THIS 
PERSISTENT HEAVY RAINFALL WILL PRODUCE FLOODING PROBLEM ACROSS URBAN 
AREAS...HIGHWAYS...STREETS AND UNDERPASSES. ADDITIONALLY...STREAMS 
AND OTHER LOW LYING AND POOR DRAINAGE AREAS ARE SUBJECT TO FLOODING. 

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 6610 1829 6610 1828 6617 1827 6619
      1829 6621 1832 6620 1833 6622 1833 6627
      1837 6630 1837 6634 1835 6636 1839 6645
      1849 6644 1850 6641

$$

ER/FC

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

1 follow-up statement

902 
WGCA72 TJSJ 180041
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
841 PM AST WED OCT 17 2012

PRC021-051-061-135-137-143-145-180047-
/O.EXP.TJSJ.FF.W.0034.000000T0000Z-121018T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BAYAMON PR-GUAYNABO PR-VEGA ALTA PR-VEGA BAJA PR-DORADO PR-
TOA ALTA PR-TOA BAJA PR-
841 PM AST WED OCT 17 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM AST FOR TOA BAJA...
TOA ALTA...DORADO...VEGA BAJA...VEGA ALTA...GUAYNABO AND BAYAMON
MUNICIPALITIES...

DOPPLER RADAR INDICATED THAT THE HEAVY RAIN WHICH AFFECTED THIS AREA 
HAD MOVED AWAY OVER THE ATLANTIC WATERS. NO ADDITIONAL HEAVY 
RAINFALL IS EXPECTED ACROSS THESE AREAS AT THIS TIME.

RESIDENTS AND MOTORIST SHOULD HOWEVER BE ALERT TO PONDING OF WATER 
ON ROADWAYS AND ALLOW TIME FOR RIVERS AND SMALL STREAMS TO RETURN TO 
NORMAL LEVELS.

LAT...LON 1841 6610 1829 6610 1828 6617 1827 6619
      1829 6621 1832 6620 1833 6622 1833 6627
      1837 6630 1837 6634 1835 6636 1839 6645
      1849 6644 1850 6641

$$

ER

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
Oct 17, 1:34 PM CDT	Areal Flood Advisory	JSJ	4 hr
Oct 17, 2:30 PM CDT	Areal Flood Advisory	JSJ	5 hr
Oct 17, 3:37 PM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 17, 4:26 PM CDT	Areal Flood Advisory	JSJ	2 hr
Oct 17, 4:40 PM CDT	Areal Flood Advisory	JSJ	65 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.