Heavy Rain in Puerto Rico, August 7, 2004

Name: Heavy Rain in Puerto Rico, August 7, 2004
Start: 2004-08-07T21:15
End: 2004-08-07T21:15
Location: Puerto Rico

August 7, 2004 · NWS SJU · 1 event in 1 county or zone

1 heavy rain, 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 Aug 7, 3:00 PM AST, 6 hours 15 minutes earlier.

Area forecast discussion, Aug 7, 3:00 PM AST, 6 hours 15 minutes before

PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
300 PM AST SAT AUG 7 2004

.SYNOPSIS...AT UPPER LEVELS...A RIDGE OF HIGH PRESSURE AT 250 MB IS
BUILDING EAST ALONG 25 NORTH LATITUDE CAUSING NORTHEAST FLOW...WHICH
BECOMES SOUTHEAST BY MONDAY AND TUESDAY. FLOW CONTINUES WITH AN
EASTERLY COMPONENT THROUGH FRIDAY. CONVERGENCE AND DIVERGENCE
PATTERNS ARE VERY WEAK.

AT MID LEVELS...HIGH PRESSURE DOMINATES BETWEEN 20 TO 30 NORTH.

AT LOWER LEVELS...A WEAK WAVE THAT PASSED THE NORTHERN WINDWARD
ISLANDS THIS MORNING. ANOTHER WAVE IS NORTH OF 19 NORTH WITH A
CENTER OF CONVECTION AT 23 NORTH 52.5 WEST. THIS WAVE HAS A WIND
MINIMUM SOUTH OF IT. ANOTHER WAVE NEAR 10 NORTH 40 WEST HAS A WIND
MAXIMUM NORTH OF IT.

&&

.DISCUSSION...SOUNDING REVEALS A RELATIVELY DRY BUT UNSTABLE
SOUNDING. WINDS INCREASE TO 25 KNOTS AT 10 THOUSAND FEET...HOWEVER
AND WITH AIR DRYER THAN 50 PERCENT RELATIVE HUMIDITY ABOVE 6000 FEET
LITTLE CONVECTIVE ACTIVITY HAS BEEN POSSIBLE DURING THE AFTERNOON.
AN AREA OF BETTER MOISTURE WILL MOVE THROUGH THE U.S. VIRGIN ISLANDS
TOMORROW MORNING AROUND 12Z. MODELS SHOW A MAXIMUM THETA-E AND
RELATIVE HUMIDITY AT 18Z...AND THIS SHOULD ENHANCE ACTIVITY SOME
DURING THE DAY. THEN A MOISTURE MINIMUM MOVES THROUGH BEFORE THE
MOISTURE FROM THE SOUTHEAST ARRIVES ON MONDAY. THIS MOISTURE WILL
PASS MAINLY SOUTH OF THE AREA...BUT A FRINGE WILL AFFECT US. THIS
WILL CONTINUE TO BE THE PATTERN EVEN AS THE WAVE CURRENTLY NEAR 40
WEST MOVES BY...LIKELY ON TUESDAY. WINDS WILL ALSO INCREASE OVER THE
AREA ON TUESDAY AND TUESDAY NIGHT. MODELS CONTINUE TO SHOW A GENERAL
MOISTENING TREND AFTER WEDNESDAY WITH ANOTHER WAVE MOVING THROUGH
SUNDAY NIGHT AND MONDAY MORNING 16 AUGUST. TROPICAL DEVELOPMENT HAS
BEEN SLOW AND NONE IS SEEN IN THE NEXT 2 TO 3 DAYS.

&&

.MARINE...WINDS WILL PICK UP SOME WITH SURGE THAT IS RIDING NORTH OF
THE WAVE AT 40 NORTH...AND THIS SHOULD BRING THE HIGHEST WAVES OF
THE WEEK IN...6 TO 7 FEET...ON TUESDAY NIGHT AND WEDNESDAY. SEAS
ABATE SLOWLY THROUGH THE END OF THE WEEK THEREAFTER.

&&

.AVIATION...SATELLITE PICTURES INDICATED THAT A WIDE AREA OF SAHARAN
DUST WAS SPREAD ACROSS THE ATLANTIC FROM THE WAVE AT 52 WEST TO THE
WAVE AT 40 WEST AND FARTHER EAST. THIS AREA OF DUST COULD BE
SIGNIFICANT AND WOULD ARRIVE PERHAPS ON TUESDAY AND CONTINUE THROUGH
WEDNESDAY. WILL INTRODUCE THIS DUST INTO THE GIRDS.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  78  91  79  89 /  30  20  20  60
STT  78  90  78  87 /  40  20  40  60

&&

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

&&

SNELL

Hazardous weather outlook, Aug 7, 6:00 AM AST, 15 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
600 AM AST SAT AUG 7 2004

PRZ001>013-AMZ710>750-081000-
600 AM AST SAT AUG 7 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.

.TODAY AND TONIGHT...
THIS AFTERNOON...EXPECT SCATTERED SHOWERS...MAINLY OVER THE WEST
AND NORTHWEST PART OF PUERTO RICO. THE THUNDERSTORMS AND HEAVIER
RAINFALL SHOULD BE QUITE ISOLATED. NO HAZARDOUS WEATHER IS EXPECTED.

A GENTLE TO MODERATE EAST SOUTHEAST WIND FLOW WILL PERSIST ACROSS
THE LOCAL COASTAL WATERS TODAY. SMALL CRAFT OPERATORS SHOULD
CONTINUE TO EXERCISE CAUTION OVER THE CARIBBEAN OFFSHORE WATERS
SOUTHWEST OF PUERTO RICO DUE TO SEAS OF 4 FEET AND WINDS 15 TO 18
KNOTS.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION REQUESTED FOR COASTAL AREAS.

.DAYS TWO THROUGH SEVEN...
THE NEXT TROPICAL WAVE WILL APPROACH THE LOCAL ISLANDS LATE SUNDAY.
A SLIGHT INCREASE IN SHOWERS IS FORECAST AS THE WAVE MOVES THROUGH
ON MONDAY...BUT WILL BRING A SIGNIFICANT INCREASE IN WINDS AND SEAS.
SMALL CRAFT ADVISORY MAY BE REQUIRED.

VIZ001-002-AMZ710>730-081000-
600 AM AST SAT AUG 7 2004

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

.TODAY AND TONIGHT...
MOST OF THE SHOWER ACTIVITY WILL OCCUR OVERNIGHT INTO THE EARLY
MORNING HOURS...MAINLY IN THE SURROUNDING COASTAL WATERS. NO
HAZARDOUS WEATHER IS EXPECTED.

A GENTLE TO MODERATE EAST SOUTHEAST WIND FLOW WILL PERSIST ACROSS
THE LOCAL COASTAL WATERS TODAY. SEAS WILL BE NEAR 4 FEET.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION REQUESTED FOR COASTAL AREAS.

.DAYS TWO THROUGH SEVEN...
THE NEXT TROPICAL WAVE WILL APPROACH THE LOCAL ISLANDS LATE SUNDAY.
A SLIGHT INCREASE IN SHOWERS IS FORECAST AS THE WAVE MOVES THROUGH
ON MONDAY...BUT WILL BRING A SIGNIFICANT INCREASE IN WINDS AND SEAS.
SMALL CRAFT ADVISORY 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.

Event by event

1 heavy rain. Local standard time, as filed.

Heavy Rain, Eastern Interior

When: August 7, 9:15 PM AST
Where: Eastern Interior County, Cayey
Reported by: NWS EMPLOYEE(OFF DUTY)

Continuous rain was reported in the municipality of Cayey for several hours.

What these are

Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.

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, August 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: 5419901.