Alert archive / Puerto Rico / Flash Flood Warnings in 2009

Flash Flood Warning 50, NWS JSJ

October 10, 2009

NWS JSJ issued this flash flood warning at Oct 10, 2009, 2:41 PM CDT. It was in force for 70 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: Oct 10, 2009, 2:41 PM CDT (19:41 UTC)
Expired: Oct 10, 2009, 3:51 PM CDT
In force: 70 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 52 km from the middle of the area, began a volume at 19:45 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

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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.

000 
WGCA52 TJSJ 101941
FFWSJU
PRC039-091-102230-
/O.NEW.TJSJ.FF.W.0050.091010T1941Z-091010T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
341 PM AST SAT OCT 10 2009

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FOLLOWING MUNICIPALITIES

  IN PUERTO RICO
     CIALES
     MANATI

* UNTIL 630 PM AST

* AT 333 PM AST...A USGS RIVER GAGE ON THE RIO GRANDE DE MANATI AT   
  CIALES INDICATED THE RIVER WAS AT 7.74 FEET AND RISING RAPIDLY AND 
  FLOOD STAGE IS 10 FEET. CURRENT PROJECTIONS INDICATE THE           
  RIVER WILL RISE ABOVE THE FLOOD STAGE BY 4:30 PM AST. PEOPLE       
  TRAVELLING ALONG ROUTE 149 FROM CIALES TO MANATI SHOULD REMAIN     
  ALERT FOR RAPIDLY RISING WATERS. 

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

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 1841 6651 1842 6649 1832 6644 1831 6647

$$

ROSA

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

1 follow-up statement

000 
WGCA72 TJSJ 102051
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
451 PM AST SAT OCT 10 2009

PRC039-091-102059-
/O.CAN.TJSJ.FF.W.0050.000000T0000Z-091010T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CIALES PR-MANATI PR-
451 PM AST SAT OCT 10 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MANATI AND CIALES
MUNICIPALITIES...

AT 4:50 PM AST...A USGS SENSOR AT RIO GRANDE DE MANATI AT CIALES 
INDICATED THAT THE RIVER HAD CRESTED BELOW FLOOD STAGE AND WAS 
FALLING RAPIDLY. ANY ADDITIONAL RAINFALL WILL BE LIGHT AND SHOULD 
NOT CAUSE ANY ADDITIONAL RISES. THEREFORE...THE FLASH FLOOD WARNING 
WILL BE CANCELLED. 

LAT...LON 1841 6651 1842 6649 1832 6644 1831 6647

$$

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 Oct 10, 2:19 PM CDT, 22 minutes earlier.

Area forecast discussion, Oct 10, 2:19 PM CDT, 22 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
319 PM AST SAT OCT 10 2009

.SYNOPSIS...SURFACE HIGH PRESSURE CENTERED OVER BERMUDA THIS
AFTERNOON TO PREVAIL ACROSS THE WESTERN ATLANTIC FOR THE NEXT FEW DAYS.

SURFACE TROUGH CROSSING THE MONA CHANNEL AT THIS TIME...TO MOVE
AWAY FROM THE LOCAL AREA TONIGHT.

&&

.DISCUSSION...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT
THE CENTRAL INTERIOR SECTION OF THE ISLAND FOR THE NEXT FEW
HOURS...BEFORE IT DISSIPATES OR MOVES AWAY FROM THIS AREA.
AFTERWARD...RELATIVELY DRIER AIR AND STABLE CONDITIONS WILL
PREVAIL ACROSS THE LOCAL AREA FOR THE REST OF THE WEEKEND
CONTINUING THROUGH THE UPCOMING WEEK. HOWEVER...LOW LEVEL MOISTURE
FROM THE NORTHEASTERN CARIBBEAN WILL BE PUSHED TOWARD THE LOCAL
ISLANDS UNDER THE INFLUENCE OF A MODERATE EAST NORTHEASTERLY FLOW
TO PRODUCE SHOWERS ALONG THE NORTHERN COASTAL AREAS OF THE
ISLANDS...MAINLY DURING THE EVENING AND OVERNIGHT HOURS FOR THE
NEXT SEVERAL DAYS.

AFTERNOON SHOWER ACTIVITY TO CONCENTRATE OVER THE SOUTHWEST
PORTION OF THE ISLAND OF PUERTO RICO FOR THE NEXT FEW DAYS.

THE USVI TO ENJOY PLEASANT WEATHER CONDITIONS FOR THE NEXT SEVERAL DAYS.

&&

.AVIATION...VFR CONDITIONS ARE EXPECTED ACROSS ALL LOCAL TAF SITES
FOR THE NEXT 12 TO 18 HOURS. BRIEF MVFR CONDITIONS ARE POSSIBLE
ACROSS TJPS AND TJMZ FROM 19Z TO 22Z THIS AFTERNOON.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  78  88  77  88 /  10  40  40  40
STT  79  88  78  88 /   0  40  40  40

&&

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

15/17

Hazardous weather outlook, Oct 10, 4:19 AM CDT, 10 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN
ISLANDS
NATIONAL WEATHER SERVICE SAN JUAN PR
519 AM AST SAT OCT 10 2009

AMZ710>745-PRZ001>013-111000-
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-
519 AM AST SAT OCT 10 2009

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...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

AMZ715-725-VIZ001-002-111000-
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-
519 AM AST SAT OCT 10 2009

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...SUNDAY THROUGH FRIDAY

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
Oct 9, 7:45 PM CDT	Areal Flood Advisory	JSJ	54 min
Oct 10, 1:57 PM CDT	Areal Flood Advisory	JSJ	116 min
Oct 10, 6:17 PM CDT	Flash Flood Warning	JSJ	4 hr

Nearby

Flash Flood Warnings in Puerto Rico, 2009 Every flash flood warning in 2009

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.