Flash Flood in Puerto Rico, April 5, 2006

Name: Flash Flood in Puerto Rico, April 5, 2006
Start: 2006-04-05T14:35
End: 2006-04-05T17:00
Location: Puerto Rico

April 5, 2006 · NWS SJU · 1 event in 1 county or zone

1 flash flood, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

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 Apr 5, 12:11 PM AST, 2 hours 24 minutes earlier.

Area forecast discussion, Apr 5, 12:11 PM AST, 2 hours 24 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN JUAN PR
1211 PM AST WED APR 5 2006

.UPDATE...PRECIPITABLE WATER IS RISING AGAIN OVER PUERTO RICO AS
SHOWERS AND ISOLATED THUNDERSTORMS MOVE BRISKLY THROUGH THE AREA
ON EAST SOUTHEAST TRADE WINDS. THE GFS CONTINUES TO SHOW
INCREASING MOISTURE AND SHOWERS WILL DEVELOP EARLY OVER THE AREA.
LATEST RADAR SHOWS SHOWERS OVER NORTHWEST PUERTO RICO JUST AFTER
NOON AND AMOUNTS ARE HIGH. SOME AREAS WITH HEAVY RAINFALL
YESTERDAY WILL LIKELY SEE HEAVY AMOUNTS AGAIN TODAY AND THIS WILL
MAKE THEM MORE VULNERABLE TO FLOODING. HAVE UPDATED ZONES FOR
BETTER CHANCES OF RAIN OVER THE AREA. WINDS ARE SLIGHTLY STRONGER
AND SLIGHTLY DIFFERENT SO EXACT PATTERN WILL NOT BE THE SAME. SOME
POSSIBILITY OF FLASH FLOODING COULD OCCUR IF CELLS DEVELOP OVER THE
SAME AREAS HOWEVER SO SITUATION WILL BE MONITORED CLOSELY.

&&

.PREV DISCUSSION...SCATTERED SHOWERS CONTINUED ACROSS THE COASTAL
WATERS OVERNIGHT AND ARE CURRENTLY DEVELOPING ALONG THE NORTHEAST
COAST OF PUERTO RICO THIS MORNING. WHILE BRIEF PERIODS OF MODERATE
RAIN WILL BE ASSOCIATED WITH THIS SHOWER ACTIVITY...NO SIGNIFICANT
ACCUMULATION IS EXPECTED.

THE UPPER LEVEL TROUGH DIGGING TO THE WEST OF PUERTO RICO THIS
MORNING...COMBINED WITH AN INCREASE IN LOW LEVEL MOISTURE
TODAY...IS EXPECT TO ENHANCE DIURNAL SHOWER ACTIVITY THIS
AFTERNOON. WITH CONTINUED EAST SOUTH EAST FLOW EXPECTED AGAIN
TODAY...COULD SEE DIURNAL SHOWER ACTIVITY REACH INTO THE SAN JUAN
METRO AREA AS WELL AS MUCH OF THE NORTHERN SECTIONS OF PUERTO
RICO. WITH THIS IN MIND...URBAN AND SMALL STREAM FLOODING WILL THEREFORE
LIKELY BE A THREAT TO THE AREAS RECEIVING THE HEAVIEST RAINFALL
DURING THE AFTERNOON AND EVENING HOURS.

EXPECT THE CONTINUED PRESENCE OF THE TROUGH WEST OF PUERTO RICO
COMBINED WITH ABUNDANT LOW LEVEL MOISTURE...TO KEEP THE WEATHER
ACTIVE OVER PUERTO RICO AND THE U.S. VIRGIN ISLANDS AGAIN ON
THURSDAY...BEFORE SLIGHTLY DRIER AIR MOVES IN BEHIND THIS UPPER
LEVEL TROUGH FOR THE FIRST PART OF THE WEEKEND.

SYNOPSIS...HIGH PRESSURE OVER THE CENTRAL EAST ATLANTIC WILL
CONTINUE TO PRODUCE AN EAST SOUTHEASTERLY WIND OVER THE LOCAL
AREA...AS MOISTURE WILL CONTINUE TO INCREASE ACROSS THE AREA AHEAD OF
AN UPPER LEVEL TROUGH THAT IS EXPECTED TO DIG SOUTHWARD OVER THE
CARIBBEAN THROUGH EARLY FRIDAY.

MARINE...SMALL CRAFT SHOULD CONTINUE TO EXERCISE CAUTION ACROSS
THE OFF SHORE ATLANTIC WATERS AND CARIBBEAN PASSAGES DUE TO A MIX
OF EAST NORTHEAST WIND WAVES AND LONG PERIOD NORTH NORTHEAST
SWELLS.

&&

.SJU WATCHES/WARNINGS/ADVISORIES...

PR...NONE.
VI...NONE.

&&

SNELL

Hazardous weather outlook, Apr 5, 8:50 AM AST, 5 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE SAN JUAN PR
850 AM AST WED APR 5 2006

PRZ001>013-AMZ710>750-061000-
850 AM AST WED APR 5 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.

.TODAY AND TONIGHT...MOISTURE WILL INCREASE TODAY PRODUCING
CONDITIONS FAVORABLE FOR THE GENERATION OF AFTERNOON SHOWERS AND
THUNDERSTORMS IN WESTERN PUERTO RICO. THESE STORMS WILL BE
CAPABLE OF GENERATING URBAN AND SMALL STREAM FLOODING.

.DAYS TWO THROUGH SEVEN...MOISTURE WILL REMAIN HIGH ON THURSDAY AND
CONTINUE TO AFFECT THE LOCAL AREA THROUGH SATURDAY. THIS WILL
PRODUCE CONDITIONS FAVORABLE FOR THE GENERATION OF AFTERNOON SHOWERS
AND THUNDERSTORMS IN WESTERN PUERTO RICO WHICH WILL BE CAPABLE OF
GENERATING URBAN AND SMALL STREAM FLOODING EACH OF THOSE DAYS. NO
OTHER HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

VIZ001-002-AMZ710>730-061000-
850 AM AST WED APR 5 2006

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

.TODAY AND TONIGHT...MOISTURE WILL INCREASE TODAY AND PRODUCE
CONDITIONS FAVORABLE FOR THE GENERATION OF AFTERNOON SHOWERS AND
POSSIBLY A THUNDERSTORM.

.DAYS TWO THROUGH SEVEN...MOISTURE WILL REMAIN HIGH ON THURSDAY AND
CONTINUE TO AFFECT THE LOCAL AREA THROUGH SATURDAY. THIS WILL
PRODUCE CONDITIONS FAVORABLE FOR THE GENERATION OF SHOWERS AND
THUNDERSTORMS WHICH MAY PRODUCE LOCALIZED GUT FLOODING. NO OTHER
HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION IS MAY BE REQUIRED.

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.

SNELL

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Northeast

When: April 5, 2:35 PM AST to 5:00 PM AST
Where: Northeast County, Rio Grande
Reported by: EMERGENCY MANAGER
Coordinates: 18.350, -65.800

River Mameyes was reported out of its banks along road 191 at the rain forest entrance, and at Barrio Sonadora along road 186. An upper level trough to the west of Puerto Rico combined with an increase in low level moisture to produce heavy rain in the Luquillo rain forest where accumulations of more than four inches occurred in a three hour period.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

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

The same day elsewhere

Every storm in Puerto Rico in 2006 Every state in 2006 This day in weather history Warnings in Puerto Rico, April 2006

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: 5503641.