Alert archive / Puerto Rico / Flash Flood Warnings in 2011

Flash Flood Warning 38, NWS JSJ

May 24, 2011

NWS JSJ issued this flash flood warning at May 24, 2011, 6:04 PM CDT. It was in force for 3 hr. 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 24, 2011, 6:04 PM CDT (23:04 UTC)
Expired: May 24, 2011, 9:00 PM CDT
In force: 3 hr
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 23:06 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.

690 
WGCA52 TJSJ 242304
FFWSJU
PRC045-105-135-250200-
/O.NEW.TJSJ.FF.W.0038.110524T2304Z-110525T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
704 PM AST TUE MAY 24 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     COMERIO
     NARANJITO
     TOA ALTA

* UNTIL 1000 PM AST

* AT 655 PM AST...THE U.S.G.S. RIVER SENSOR IN COMERIO INDICATED 
THAT THE LEVELS OF THE RIO LA PLATA WAS ABOVE FLOOD STAGE. AT 700 PM 
AST...THE RIVER LEVEL IS NOW SLOWLY FALLING...BUT IS EXPECTED TO 
CONTINUE ABOVE FLOOD STAGE DURING THE NEXT COUPLE OF HOURS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN MOUNTAINOUS OR HILLY TERRAIN...THERE ARE HUNDREDS OF LOW WATER
CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT
ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT
ONLY TAKES A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES
AWAY.

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 1834 6625 1835 6621 1822 6618 1819 6622
      1819 6625

$$

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

1 follow-up statement

165 
WGCA72 TJSJ 250207
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1007 PM AST TUE MAY 24 2011

PRC045-105-135-250214-
/O.EXP.TJSJ.FF.W.0038.000000T0000Z-110525T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COMERIO PR-NARANJITO PR-TOA ALTA PR-
1007 PM AST TUE MAY 24 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR TOA ALTA...NARANJITO AND
COMERIO 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. RUN-OFF HAS ALSO SUBSIDED.

LAT...LON 1834 6625 1835 6621 1822 6618 1819 6622
      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 23, 10:37 PM CDT	Areal Flood Warning	JSJ	4 hr
May 24, 1:36 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 2:15 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 3:24 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 24, 4:07 PM CDT	Flash Flood Warning	JSJ	113 min
May 24, 4:36 PM CDT	Special Marine Warning	JSJ	39 min
May 24, 5:12 PM CDT	Flash Flood Warning	JSJ	10 hr
May 24, 5:53 PM CDT	Flash Flood Warning	JSJ	7 hr

Nearby

Flash Flood Warnings in Puerto Rico, 2011 Every flash flood warning in 2011

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.