Scattered thunderstorms affected the municipality of San Sebastian by mid afternoon and caused locally heavy rainfall. Doppler radar estimated two to three inches over a period of three hours.
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The episode as NWS SJU wrote it up.
Scattered thunderstorms affected the municipality of San Sebastian by mid afternoon and caused locally heavy rainfall. Doppler radar estimated two to three inches over a period of three hours.
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 21, 3:50 PM AST, 1 hour 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 350 PM AST MON MAY 21 2007 .SHORT TERM...VARIABLY CLOUDY SKIES WERE DETECTED THIS AFTERNOON OVER THE LOCAL REGION. THE NWS DOPPLER RADAR DETECTED SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS OVER THE WESTERN AND INTERIOR SECTIONS OF PUERTO RICO EARLY IN THE AFTERNOON. THE HEAVIEST ACTIVITY OCCURRED OVER THE MUNICIPALITIES OF UTUADO...LARES...AND SAN SEBASTIAN. THIS IS A GOOD INDICATION THAT OUR LOCAL ATMOSPHERE WAS BEGUN TO SEE A SLOW AND GRADUAL INCREASE IN MOISTURE. THESE SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THAT SECTIONS OF THE ISLAND UNTIL LATE AFTERNOON OR EARLY EVENING HOURS. OVER THE REST OF THE REGION INCLUDING THE U.S. VIRGIN ISLANDS...ONLY ISOLATED SHOWERS WERE DETECTED. FOR THIS EVENING...PARTLY CLOUDY SKIES WILL PREVAIL WITH ONLY ISOLATED TO SCATTERED PASSING SHOWERS OVER THE USVI AND THE EASTERN SECTIONS OF PUERTO RICO. HOWEVER...NO SIGNIFICANT OR WIDESPREAD PCPN IS EXPECTED. WITH A MORE EASTERLY TRADE FLOW OVER THE REGION THE TEMPERATURES ALONG THE NORTHERN COASTAL MUNICIPALITIES OF PUERTO RICO WILL BE LESS WARMER THAN PREVIOUS DAYS. .LONG TERM...A LARGE 1037 MB STRONG SURFACE HIGH PRESSURE OVER THE NORTHEASTERN AND CENTRAL ATLANTIC WILL REMAIN ANCHORED OVER THAT PLACE DURING THE NEXT FEW DAYS...WHILE WEAKENING. AT THE SAME TIME A TROUGH OF LOW PRESSURE FROM HISPANIOLA ACROSS THE EASTERN BAHAMAS...AND EXTENDING TO THE EAST NORTHEAST ACROSS THE SOUTHWEST ATLANTIC FOR SEVERAL HUNDRED MILES...WILL LINGER OVER THAT AREA DURING THE NEXT SEVERAL DAYS. THESE FEATURES WILL COMBINE TO PROMOTE A MODERATE EAST TO SOUTHEAST TRADE WIND FLOW ACROSS THE LOCAL ISLANDS AT LEAST UNTIL THE END OF THE WORK WEEK. THIS TROUGH WILL ALSO HELP TO DESTABILIZE THE LOCAL ATMOSPHERE SPECIALLY DURING THE AFTERNOONS TO PRODUCE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS...MAINLY OVER THE WESTERN AND INTERIOR SECTIONS OF PUERTO RICO. THIS MORE WET WEATHER PATTERN WILL PREVAIL OVER THE FA AT LEAST UNTIL THE UPCOMING WEEKEND. && .PRELIMINARY POINT TEMPS/POPS... SJU 75 88 75 88 / 40 20 20 20 STT 78 86 78 86 / 20 20 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 99/99
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 600 AM AST MON MAY 21 2007 PRZ001>013-AMZ710>750-221000- 600 AM AST MON MAY 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...AFTERNOON SHOWERS AND AN ISOLATED THUNDERSTORM OR TWO ARE POSSIBLE ACROSS THE NORTHWEST AND WEST INTERIOR SECTIONS OF MAINLAND PUERTO RICO. BRIEF PERIODS OF MODERATE TO HEAVY RAINFALL MAY PRODUCE LOCALIZED AREAS OF STANDING WATER ALONG ROADWAYS WHERE THE DRAINAGE IS POOR. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED ELSEWHERE. .DAYS TWO THROUGH SEVEN...A CHANCE OF AFTERNOON SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS OVER THE WEST AND NORTHWEST COULD PRODUCE MINOR NUISANCE FLOODING ACROSS THE NORTHWEST SECTION OF PUERTO RICO DURING EACH AFTERNOON FOR THE NEXT SEVERAL DAYS. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. VIZ001-002-AMZ710>730-221000- 600 AM AST MON MAY 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. 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 FROM YOUR PDA/PHONE: HTTP://MOBILE.SRH.NOAA.GOV OR WWW.SRH.NOAA.GOV/WML
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Urban flooding and a small stream running out its banks were reported at the Cheneli sector and Barrio Pueblo Nuevo in San Sebastian.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2007Every state in 2007This day in weather historyWarnings in Puerto Rico, May 2007
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: 36167.