Debris Flow in Puerto Rico, May 10, 2004

Name: Debris Flow in Puerto Rico, May 10, 2004
Start: 2004-05-10T04:55
End: 2004-05-10T04:55
Location: Puerto Rico

May 10, 2004 · NWS SJU · 1 event in 1 county or zone

1 debris flow, as filed by the National Weather Service.

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Juan, PR wrote its last area forecast discussion before the first event at May 10, 4:50 AM AST, 5 minutes earlier.

Area forecast discussion, May 10, 4:50 AM AST, 5 minutes before

PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
450 AM AST MON MAY 10 2004

.DISCUSSION...
REMNANTS OF A BOUNDARY PERSIST ACROSS THE LOCAL CARIB WATERS ENE
ACROSS THE NORTHERN LEEWARDS AND THEN INTO THE CENTRAL ATLANTIC THIS
MORNING WITH INCREASED CONVERGENCE ALONG THIS FEATURE CURRENTLY
PRODUCING NUMEROUS SHOWERS ACROSS THE WATERS OF THE NORTHEAST
CARIBBEAN...AND SHOULD AFFECT THE VIRGIN ISLANDS AND POSSIBLY
SOUTHEAST PUERTO RICO THROUGHOUT THE MORNING. SHOWERS ACROSS P.R.
THUS FAR OVERNIGHT HAVE OCCURRED ALONG THE NORTHERN SLOPES AND
DOWNWIND OF EL YUNQUE AND DO NOT SEE MUCH CHANGE TO THIS PATTERN
THROUGHOUT THE DAY...EXCEPT FOR A FEW GOOD CELLS LIKELY TO DEVELOP
ACROSS W AND SW PART OF THE ISLAND. MODELS INDICATING DECREASING
TREND IN MOISTURE NEXT 48 HOURS...BUT VERY SLOWLY THROUGH 00Z
TONIGHT SO IMPROVING TREND NOT EXPECTED UNTIL TONIGHT. JET DYNAMICS
WILL RETURN TO THE REGION THU AND FRI FOR CHANCE OF DEEP TSTORMS.
&&

.MARINE...
SURFACE HIGH PRESSURE ACROSS THE W ATLC TO THE WEST OF CENTRAL ATLC
LOW AND LOCAL FRONTAL TROUGH WILL SHIFT EASTWARD INTO CENTRAL
ATLANTIC NEXT 48 HOURS TO MAINTAIN SUFFICIENT PRESSURE GRADIENT AND
FRESH TRADE WIND FLOW...AND LOCALLY ROUGH SEAS OFF SHORE ATLC. SCA
NOW IN EFFECT OFF SHORE ATLC AND PROBABLY SHOULD HAVE REMAINED IN
EFFECT OVERNIGHT. OBSERVATIONS WOULD COME IN HANDY HERE. FOR A
CHANGE GFS SURFACE WINDS MAY BE SLIGHTLY UNDERFORECAST.

&&

.HYDROLOGY...
LOCAL SOILS ALONG NE AND N COASTAL MUNICIPIOS REMAIN SATURATED WITH
MOST RIVER LEVELS HIGH OR NEAR BANKFULL. FOR THIS REASON WE HAVE
ISSUED A FLASH FLOOD WATCH FOR NE...SAN JUAN...AND N CENTRAL ZONES
DUE TO POTENTIAL QUICK RESPONSE OF RIVER AND STREAM SYSTEMS.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  82  73  84  73 /  50  40  20  40
STT  84  73  83  73 /  70  40  40  40

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...SCA AMZ710. FFA PRZ001-002-005.
VI...SCA AMZ710.

&&

Hazardous weather outlook, May 9, 6:10 AM AST, 22 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
610 AM AST SUN MAY 9 2004

PRZ001>013-AMZ710>750-101000-
610 AM AST SUN MAY 9 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.

.TODAY...MOISTURE ASSOCIATED WITH THE REMNANTS OF A COLD FRONTAL
BOUNDARY...WILL COMBINE WITH THE LOCAL EFFECTS TO PRODUCE SCATTERED
TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS...MAINLY ACROSS THE
INTERIOR AND WEST PART OF PUERTO RICO DURING THE AFTERNOON HOURS. A
FEW LOCATIONS WILL AGAIN RECEIVE ENOUGH RAINFALL TO RESULT IN SOME
URBAN AND SMALL STREAM FLOODING...WITH THE POTENTIAL FOR LOCALIZED
FLASH OR RIVER FLOODING.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED.

.DAYS TWO THROUGH SEVEN...

EXPECT SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. ASSOCIATED
RAINFALL COULD RESULT IN AT LEAST SOME URBAN AND SMALL STREAM
FLOODING.

A MODERATE TO FRESH WIND FLOW AND CHOPPY SEAS WILL PREVAIL ACROSS
THE LOCAL WATERS UNTIL WEDNESDAY.

VIZ001-002-AMZ710>730-101000-
610 AM AST SUN MAY 9 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS.

.TODAY...SCATTERED SHOWERS WILL OCCUR ACROSS MOST OF THE ISLANDS
TODAY. ASSOCIATED RAINFALL COULD RESULT IN SOME URBAN AND GUT
FLOODING.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...

SCATTERED SHOWERS WILL OCCUR ACROSS THE U.S. VIRGIN ISLANDS DURING
THE NEXT SEVERAL DAYS. NO HAZARDOUS WEATHER CONDITIONS IS EXPECTED.

A MODERATE TO FRESH WIND FLOW AND CHOPPY SEAS WILL PREVAIL ACROSS
THE LOCAL WATERS UNTIL WEDNESDAY.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE WEB
SITE FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS AT (ALL LOWERCASE
LETTERS): HTTP://WWW.SRH.NOAA.GOV/SJU.

In the hours before

Local storm report, May 10, 12:31 AM AST, 4 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1231 AM AST MON MAY 10 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0545 PM     FLASH FLOOD      VEGA ALTA               18.42N 66.32W
05/09/2004                   VEGA ALTA          PR   EMERGENCY MNGR

            RIVER CIBUCO WAS REPORTED OUT OF ITS BANKS AND FLOODING
            ROADS 2, 620, 647, 675, 676, 690, IN THE MUNICIPALITIES
            OF VEGA BAJA AND VEGA ALTA

&&

RM

Local storm report, May 10, 12:35 AM AST, 4 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1235 AM AST MON MAY 10 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0555 PM     HEAVY RAIN       ANASCO                  18.29N 67.14W
05/09/2004  0.00 INCH        ANASCO             PR   EMERGENCY MNGR

            LANSLIDE WAS REPORTED IN ANASCO, AT THE OVEJA AND
            VILLALOBO SECTORS AND WAS AFFECTING ONE HOUSE.

&&

RM

Local storm report, May 10, 12:38 AM AST, 4 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1238 AM AST MON MAY 10 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0555 PM     FLOOD            CABO ROJO               18.09N 67.15W
05/09/2004                   CABO ROJO          PR   AIRPLANE PILOT

            A HOUSE WS REPORTED TO BE AFECTED BY FLOOD WATERS AT
            URBANIZACION RIVERA IN CABO ROJO.

0555 PM     FLOOD            CABO ROJO               18.09N 67.15W
05/09/2004                   CABO ROJO          PR   EMERGENCY MNGR

            A HOUSE WAS REPORTED FLOODED AT URBANIZACION RIVERA IN
            CABO ROJO.

&&

RM

Local storm report, May 10, 12:38 AM AST, 4 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN JUAN PR
1238 AM AST MON MAY 10 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0555 PM     FLOOD            CABO ROJO               18.09N 67.15W
05/09/2004                   CABO ROJO          PR   EMERGENCY MNGR

            A HOUSE WAS REPORTED FLOODED AT URBANIZACION RIVERA IN
            CABO ROJO.

&&

RM

Event by event

1 debris flow. Local standard time, as filed.

Debris Flow, San Juan and Vicinity

When: May 10, 4:55 AM AST
Where: San Juan and Vicinity forecast zone
Reported by: EMERGENCY MANAGER

A landslide was reported at Barrio Barrazas in Carolina, along road 856, km. 2.2, Cuesta Los Flacos.

What these are

Debris Flow: A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Puerto Rico in 2004 Every state in 2004 This day in weather history Warnings in Puerto Rico, May 2004

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5398788.