Alert archive / Puerto Rico / Flash Flood Warnings in 2012

Flash Flood Warning 21, NWS JSJ

May 9, 2012

NWS JSJ issued this flash flood warning at May 9, 2012, 4:11 PM CDT. It was in force for 61 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 9, 2012, 4:11 PM CDT (21:11 UTC)
Expired: May 9, 2012, 5:12 PM CDT
In force: 61 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 23 km from the middle of the area, began a volume at 21:10 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.

198 
WGCA52 TJSJ 092111
FFWSJU
PRC021-045-105-135-100015-
/O.NEW.TJSJ.FF.W.0021.120509T2111Z-120510T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
511 PM AST WED MAY 9 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     BAYAMON
     COMERIO
     NARANJITO
     TOA ALTA

* UNTIL 815 PM AST

* AT 505 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  RAIN HAD ENDED OVER THE WARNED AREA. BUT WATER IS RUSHING DOWN THE 
  LA PLATA RIVER.

FOR THE RIO DE LA PLATA AT COMERIO - COMP4
     FLOOD STAGE - 11 FEET.
     AT 505 PM AST...THE USGS SENSOR INDICATED THE RIVER HAD RISEN
     TO...
     10.22 FEET.
     MINOR 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 1835 6625 1833 6620 1824 6619 1822 6622
      1818 6623 1819 6625

$$

SNELL

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

1 follow-up statement

882 
WGCA72 TJSJ 092212
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
612 PM AST WED MAY 9 2012

PRC021-045-105-135-092218-
/O.CAN.TJSJ.FF.W.0021.000000T0000Z-120510T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BAYAMON PR-COMERIO PR-NARANJITO PR-TOA ALTA PR-
612 PM AST WED MAY 9 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR TOA ALTA...
NARANJITO...COMERIO AND BAYAMON MUNICIPALITIES...

FOR THE RIO DE LA PLATA AT COMERIO - COMP4
     FLOOD STAGE - 11 FEET.
     AT 604 PM AST...THE USGS SENSOR INDICATED THE RIVER HAS         
     FALLEN TO...
     9.66 FEET. 
     SINCE RAINFALL HAS ENDED IN THE AREA AND NO NEW                 
     RAINFALL IS EXPECTED BEFORE 10 PM AST...FLOODING IS NO LONGER   
     A THREAT.

LAT...LON 1835 6625 1833 6620 1824 6619 1822 6622
      1818 6623 1819 6625

$$

SNELL

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 8, 7:06 PM CDT	Areal Flood Warning	JSJ	10 hr
May 8, 7:44 PM CDT	Flash Flood Warning	JSJ	2 hr
May 8, 7:45 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 8, 10:55 PM CDT	Areal Flood Warning	JSJ	4 hr
May 9, 1:44 AM CDT	Areal Flood Warning	JSJ	6 hr
May 9, 1:12 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 9, 2:56 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 9, 4:00 PM CDT	Areal Flood Advisory	JSJ	2 hr

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; radar from the NEXRAD Level II archive.