Alert archive / Puerto Rico / Flash Flood Warnings in 2012

Flash Flood Warning 15, NWS JSJ

March 31, 2012

NWS JSJ issued this flash flood warning at Mar 31, 2012, 1:44 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: Mar 31, 2012, 1:44 AM CDT (06:44 UTC)
Expired: Mar 31, 2012, 3:34 AM CDT
In force: 110 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 7 km from the middle of the area, began a volume at 06:46 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.

630 
WGCA52 TJSJ 310644
FFWSJU
PRC057-109-129-151-310945-
/O.NEW.TJSJ.FF.W.0015.120331T0644Z-120331T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
244 AM AST SAT MAR 31 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     GUAYAMA
     PATILLAS
     SAN LORENZO
     YABUCOA

* UNTIL 545 AM AST

* AT 237 AM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN OVER THE WARNED AREA. IN ADDITION...U.S.G.S. RIVER 
SENSORS INDICATE THAT THE RIO GRANDE DE PATILLAS IN PATILLAS IS 
RISING RAPIDLY AND APPROACHING FLOOD STAGE.

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...

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 1810 6608 1810 6601 1802 6598 1801 6603

$$

JJA

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

1 follow-up statement

092 
WGCA72 TJSJ 310834
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
434 AM AST SAT MAR 31 2012

PRC057-109-129-151-310842-
/O.CAN.TJSJ.FF.W.0015.000000T0000Z-120331T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUAYAMA PR-PATILLAS PR-SAN LORENZO PR-YABUCOA PR-
434 AM AST SAT MAR 31 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR YABUCOA...SAN
LORENZO...PATILLAS AND GUAYAMA 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. IN ADDITION...U.S.G.S. 
RIVER SENSORS INDICATE THAT THE RIVER IS BELOW FLOOD STAGE AND 
RECEDING. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN CANCELED.

LAT...LON 1810 6608 1810 6601 1802 6598 1801 6603

$$

JJA

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	Counties	Lasted
Mar 30, 11:16 PM CDT	Areal Flood Advisory	JSJ		5 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.