Alert archive / Puerto Rico / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS JSJ

May 1, 2011

NWS JSJ issued this flash flood warning at May 1, 2011, 11:13 AM 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 1, 2011, 11:13 AM CDT (16:13 UTC)
Expired: May 1, 2011, 1:48 PM CDT
In force: 3 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 31 km from the middle of the area, began a volume at 16:15 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.

639 
WGCA52 TJSJ 011613
FFWSJU
PRC127-011915-
/O.NEW.TJSJ.FF.W.0008.110501T1613Z-110501T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
1213 PM AST SUN MAY 1 2011

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITY

  IN PUERTO RICO
     SAN JUAN

* UNTIL 315 PM AST

* AT 1206 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED
TO INDICATE PERSISTENT MODERATE TO HEAVY RAINFALL OVER SAN JUAN 
AREA...WHICH IS LEADING TO RAPID RISES IN THE RIO PIEDRAS RIVER AND 
ITS TRIBUTARIES. AS A RESULT...EXPECT FLASH FLOODING ACROSS THESE 
AREAS. RAINFALL TOTALS OF 2 TO 3 INCHES HAVE ALREADY BEEN MEASURED 
IN SOME AREAS AND ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE 
EXPECTED DURING THE NEXT FEW HOURS.

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.

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.

&&

LAT...LON 1843 6610 1845 6604 1833 6604 1832 6608

$$

ER

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

1 follow-up statement

182 
WGCA72 TJSJ 011848
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
248 PM AST SUN MAY 1 2011

PRC127-011854-
/O.CAN.TJSJ.FF.W.0008.000000T0000Z-110501T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN PR-
248 PM AST SUN MAY 1 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SAN JUAN
MUNICIPALITY...

RAIN HAS BECOME ISOLATED AND MUCH LIGHTER. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN CANCELLED. HOWEVER...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. NEVERTHELESS...NEW SHOWERS ARE POSSIBLE ACROSS THESE 
AREAS THIS LATER TODAY AND COULD RESULT IN ADDITIONAL HEAVY RAINFALL 
AND FLOODING. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THESE AREAS 
THROUGH TUESDAY MORNING.

LAT...LON 1843 6610 1845 6604 1833 6604 1832 6608

$$

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
May 1, 3:13 AM CDT	Flash Flood Watch	JSJ	40 hr
May 1, 7:22 AM CDT	Areal Flood Advisory	JSJ	6 hr
May 1, 8:35 AM CDT	Areal Flood Advisory	JSJ	9 hr
May 1, 9:22 AM CDT	Areal Flood Advisory	JSJ	9 hr
May 1, 10:41 AM CDT	Flash Flood Warning	JSJ	3 hr
May 1, 11:24 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 1, 1:54 PM CDT	Areal Flood Advisory	JSJ	5 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.