Alert archive / Puerto Rico / Flash Flood Warnings in 2010

Flash Flood Warning 4, NWS JSJ

March 11, 2010

NWS JSJ issued this flash flood warning at Mar 11, 2010, 7:22 AM CST. 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: Mar 11, 2010, 7:22 AM CST (13:22 UTC)
Expired: Mar 11, 2010, 10:01 AM CST
In force: 3 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 44 km from the middle of the area, began a volume at 13:23 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.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 8 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The text

As transmitted, in the capitals the NWS used until 2016.

709 
WGCA52 TJSJ 111322
FFWSJU
PRC037-053-103-111615-
/O.NEW.TJSJ.FF.W.0004.100311T1322Z-100311T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
922 AM AST THU MAR 11 2010

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     NAGUABO
     CEIBA
     FAJARDO

* UNTIL 1215 PM AST

* AT 912 AM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN HAS FALLEN OVER THE PARAISO AREA IN FAJARDO WITH   
  UP TO SIX INCHES OF RAIN ESTIMATED BY RADAR. IN ADDITION...USGS    
  GAGES ON THE FAJARDO RIVER INDICATE THAT THE RIVER IS RISING       
  RAPIDLY WITH THE RIVER LIKELY TO COME OUT OF ITS BANKS. PEOPLE     
  TRAVELING ALONG ROUTES 53...975...976 AND 977 IN THE PARAISO AREA  
  SHOULD REMAIN ALERT TO SUDDEN SURGES IN WATER. 

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 1821 6572 1828 6575 1834 6564 1825 6563

$$

ROSA

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

2 follow-up statements

733 
WGCA72 TJSJ 111453
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1053 AM AST THU MAR 11 2010

PRC037-053-103-111615-
/O.CON.TJSJ.FF.W.0004.000000T0000Z-100311T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NAGUABO PR-CEIBA PR-FAJARDO PR-
1053 AM AST THU MAR 11 2010

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 PM AST FOR
FAJARDO...CEIBA AND NAGUABO MUNICIPALITIES...

AT 1045 AM AST...RADAR INDICATED THAT THE RAIN HAS DIMINISHED 
SIGNIFICANTLY BUT RUNOFF FROM PREVIOUS HEAVY RAINFALL WILL CONTINUE 
TO CAUSE PROBLEMS ALONG THE FAJARDO RIVER. EMERGENCY MANAGEMENT 
REPORTED THE FAJARDO RIVER WAS OUT OF ITS BANKS WITH ROUTES 3 AND 53 
FLOODED. USGS GAGES INDICATED THAT THE RIVER HAS CRESTED BUT STILL 
REMAINS OUT OF ITS BANKS.  

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SAN
JUAN.

&&

LAT...LON 1821 6572 1828 6575 1834 6564 1825 6563

$$

ROSA

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

782 
WGCA72 TJSJ 111601
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1201 PM AST THU MAR 11 2010

PRC037-053-103-111610-
/O.CAN.TJSJ.FF.W.0004.000000T0000Z-100311T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NAGUABO PR-CEIBA PR-FAJARDO PR-
1201 PM AST THU MAR 11 2010

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR FAJARDO...CEIBA AND
NAGUABO MUNICIPALITIES...

DOPPLER RADAR INDICATED THAT THE HEAVY RAIN WHICH AFFECTED THIS AREA 
HAD DISSIPATED OR MOVED AWAY. USGS GAGES ALSO INDICATED THAT THE 
FAJARDO RIVER HAS DROPPED BELOW FLOOD STAGE. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 1821 6572 1828 6575 1834 6564 1825 6563

$$

ROSA

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

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS JSJ wrote its last area forecast discussion before this flash flood warning went out at Mar 11, 3:28 AM CST, 3 hours 54 minutes earlier.

Area forecast discussion, Mar 11, 3:28 AM CST, 3 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
528 AM AST THU MAR 11 2010

.SYNOPSIS...STATIONARY AND WEAKENING FRONTAL BOUNDARY EXTENDING FROM
SOUTHERN LEEWARD ISLANDS...EAST NORTHEASTWARD ACROSS THE ATLANTIC
WILL CONTINUE TO DISSIPATE TODAY AND TOMORROW. MID TO UPPER LEVEL
RIDGE WILL BUILD ACROSS THE REGION DURING THE NEXT FEW DAYS INDUCING
AN INCREASE IN WINDS AND LESS SHOWER ACTIVITY ACROSS THE FA FOR THE
UPCOMING WEEKEND.

&&

.DISCUSSION...THE REMNANTS OF THE WEAK FRONTAL BOUNDARY ACROSS THE
SOUTHERN LEEWARD ISLANDS THIS MORNING...WILL CONTINUE TO PRODUCE
SOME CLOUDINESS AND ISOLATED TO SCATTERED SHOWERS ACROSS THE LOCAL
ISLANDS AND COASTAL WATERS DURING THE NEXT FEW DAYS. THIS MOISTURE
IN COMBINATION WITH SEA BREEZE DEVELOPMENT AND LOCAL EFFECTS WILL
AID IN THE DEVELOPMENT OF LIGHT TO MODERATE SHOWERS ACROSS PARTS OF
THE LOCAL ISLANDS TODAY...BUT NO WIDESPREAD RAINFALL IS EXPECTED AT
THIS TIME. THE FRONTAL REMNANTS WILL FINALLY LOSE IDENTITY WITH A
GRADUAL DECREASE IN MOISTURE AND CLOUD COVER THROUGH THE UPCOMING
WEEKEND. HOWEVER...THIS BREAK IN CLOUD COVER WILL HELP PROVIDE
SUFFICIENT DAYTIME HEATING WHICH WILL ENHANCE AFTERNOON AND LATE
EVENING SHOWER DEVELOPMENT. LATEST TJSJ 11/00Z SOUNDING INDICATED A
NORTHEAST LOW LEVEL WIND FLOW UP TO 15 KNOTS...BECOMING
SOUTHWESTWARD AND STRONGER AT 5K FEET AND ALOFT. LOW LEVEL WINDS
WILL BECOME MORE EASTERLY BY FRIDAY AND SOUTHEASTERLY BY THE
WEEKEND...PRODUCING AGAIN WARMER THAN NORMAL TEMPERATURES ALONG THE
NORTHERN SECTIONS OF PUERTO RICO. LATEST MODELS SUGGEST SOME
MOISTURE ACROSS THE LOCAL ISLANDS BY MID WEEK.

&&

.AVIATION...THE REMNANTS OF THE WEAK FRONTAL BOUNDARY ACROSS THE
SOUTHERN LEEWARD ISLANDS THIS MORNING...WILL CONTINUE TO PRODUCE
SOME CLOUDINESS AND ISOLATED TO SCATTERED SHOWERS ACROSS THE LOCAL
ISLANDS AND COASTAL WATERS DURING THE NEXT FEW DAYS. THIS MOISTURE
IN COMBINATION WITH SEA BREEZE DEVELOPMENT AND LOCAL EFFECTS WILL
AID IN THE DEVELOPMENT OF LIGHT TO MODERATE SHOWERS ACROSS PARTS OF
THE LOCAL ISLANDS TODAY...BUT NO WIDESPREAD RAINFALL IS EXPECTED AT
THIS TIME. THE FRONTAL REMNANTS WILL FINALLY LOSE IDENTITY WITH A
GRADUAL DECREASE IN MOISTURE AND CLOUD COVER THROUGH THE UPCOMING
WEEKEND. HOWEVER...THIS BREAK IN CLOUD COVER WILL HELP PROVIDE
SUFFICIENT DAYTIME HEATING WHICH WILL ENHANCE AFTERNOON AND LATE
EVENING SHOWER DEVELOPMENT. LATEST TJSJ 11/00Z SOUNDING INDICATED A
NORTHEAST LOW LEVEL WIND FLOW UP TO 15 KNOTS...BECOMING
SOUTHWESTWARD AND STRONGER AT 5K FEET AND ALOFT. LOW LEVEL WINDS
WILL BECOME MORE EASTERLY BY FRIDAY AND SOUTHEASTERLY BY THE
WEEKEND...PRODUCING AGAIN WARMER THAN NORMAL TEMPERATURES ALONG THE
NORTHERN SECTIONS OF PUERTO RICO. LATEST MODELS SUGGEST SOME
MOISTURE ACROSS THE LOCAL ISLANDS BY MID WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  84  75  85  75 /  20  20  10  20
STT  84  75  84  76 /  20  20  10  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
&&

09/72

Hazardous weather outlook, Mar 11, 3:10 AM CST, 4 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN
ISLANDS
NATIONAL WEATHER SERVICE SAN JUAN PR
510 AM AST THU MAR 11 2010

AMZ710>745-PRZ001>013-120915-
SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR-
NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST-
WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES-
THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS-
510 AM AST THU MAR 11 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE
ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

AMZ715-725-VIZ001-002-120915-
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-
510 AM AST THU MAR 11 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND
THE ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Mar 11, 5:57 AM CST	Areal Flood Advisory	JSJ	3 hr
Mar 11, 8:58 AM CST	Areal Flood Advisory	JSJ	3 hr
Mar 11, 9:18 AM CST	Flash Flood Warning	JSJ	3 hr
Mar 11, 11:34 AM CST	Areal Flood Advisory	JSJ	3 hr
Mar 11, 11:41 AM CST	Flash Flood Warning	JSJ	4 hr
Mar 11, 2:10 PM CST	Areal Flood Advisory	JSJ	3 hr
Mar 11, 2:26 PM CST	Areal Flood Advisory	JSJ	3 hr

Nearby

Flash Flood Warnings in Puerto Rico, 2010 Every flash flood warning in 2010

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.