Upper level low in the vicinity of the local area produced an unstable airmass which combined with light winds, and resulted in favorable conditions for strong thunderstorms to develop over the western section of Puerto Rico during the afternoon.
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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.
The episode as NWS SJU wrote it up.
Upper level low in the vicinity of the local area produced an unstable airmass which combined with light winds, and resulted in favorable conditions for strong thunderstorms to develop over the western section of Puerto Rico during the afternoon.
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 6, 4:39 AM AST, 9 hours 41 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 439 AM AST MON AUG 6 2007 SYNOPSIS...THE INTERACTION BETWEEN A PASSING TROPICAL WAVE AND AN UPPER LEVEL LOW OVER THE LOCAL AREA WILL CONTINUE TO MAINTAIN SCATTERED SHOWERS ACROSS THE ATLANTIC COASTAL WATERS THIS MORNING. A NEARLY STATIONARY 1026 MB HIGH PRESSURE SYSTEM OVER THE CENTRAL ATLANTIC IS EXPECTED TO PERSIST FOR THE NEXT COUPLE OF DAYS...RESULTING IN A GENTLE TO MODERATE TRADE WIND FLOW ACROSS THE LOCAL WATERS THROUGH THE END OF THE WEEK. DISCUSSION...THE SCATTERED TO NUMEROUS SHOWER AND ISOLATED THUNDERSTORMS THAT AFFECTED THE LOCAL ATLANTIC WATERS QUICKLY DISSIPATED AFTER MIDNIGHT. THE DOPPLER RADAR ONLY SHOWED A FEW SHOWERS AFFECTING THE NORTH CENTRAL SECTIONS OF PUERTO RICO. NO SIGNIFICANT RAINFALL ACCUMULATIONS WERE REPORTED. EXPECT CLEAR TO PARTLY CLOUDY SKIES ACROSS PUERTO RICO DURING THE MORNING HOURS. THIS AFTERNOON LINGERING MOISTURE LEFT BEHIND THE BY A WEAK TROPICAL...NOW MOVING ACROSS THE LOCAL REGION...WILL INTERACT WITH A TUTT LOW NORTHEAST OF THE ISLANDS ENHANCING THE AFTERNOON WEATHER ACTIVITY. THIS TUTT LOW IS EXPECTED TO MOVE WEST PLACING US UNDER MORE ACTIVE WEATHER TONIGHT THROUGH TUESDAY. MARINE...MARINERS SHOULD EXPECT SEAS BETWEEN 3 TO 5 FEET ACROSS THE ATLANTIC AND CARIBBEAN WATERS. WINDS WILL BE BETWEEN 10 TO 15 KNOTS. && .PRELIMINARY POINT TEMPS/POPS... SJU 90 76 90 77 / 50 50 50 0 STT 86 78 88 79 / 50 50 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 99/10
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 630 AM AST MON AUG 6 2007 PRZ001>013-AMZ710>750-071000- 630 AM AST MON AUG 6 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...AN UPPER LEVEL TROUGH WILL REMAIN LOCATED JUST EAST OF THE LOCAL AREA THROUGH THE REST OF THE DAY. AT THE SAME TIME...A TROPICAL WAVE IS MOVING ACROSS THE LOCAL AREA TODAY PRODUCING INCREASED SHOWER ACTIVITY AND INCREASING THE POTENTIAL FOR HEAVY RAINFALL ACROSS PORTIONS OF THE NORTHERN INTERIOR AND CENTRAL PUERTO RICO. THESE AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS WILL PRODUCE BRIEF PERIODS OF LOCALLY HEAVY RAINFALL...GUSTY WINDS... DANGEROUS LIGHTNING...AND MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS. URBAN AND SMALL STREAM FLOODING IS ALSO POSSIBLE DURING THE AFTERNOON IN ISOLATED SPOTS ACROSS THE ISLAND. .DAYS TWO THROUGH SEVEN...LINGERING LOW LEVEL MOISTURE WILL BE AVAILABLE TO COMBINE WITH LOCAL AND DIURNAL EFFECTS TO PRODUCE AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS MAINLY ACROSS THE WEST INTERIOR SECTIONS OF THE ISLAND. SOME OF THESE SHOWERS AND STORMS MAY BE LOCALLY HEAVY AT TIMES AND COULD LEAD TO MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS. THE WET WEATHER PATTERN IS CURRENTLY EXPECTED TO CONTINUE THROUGH WEDNESDAY WITH AN ELEVATED RISK OF URBAN AND SMALL STREAM FLOODING. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED. VIZ001-002-AMZ710>730-071000- 630 AM AST MON AUG 6 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP ON MONDAY DUE TO THE PASSAGE OF A TROPICAL WAVE INTERACTING WITH AN UPPER LEVEL TROUGH. SOME OF THE SHOWERS AND THUNDERSTORMS MAY BE LOCALLY HEAVY AND COULD LEAD TO MINOR FLOODING OF GUTS...POOR DRAINAGE AND LOW LYING AREAS. .DAYS TWO THROUGH SEVEN...LINGERING LOW LEVEL MOISTURE WILL BE AVAILABLE TO COMBINE WITH LOCAL AND DIURNAL EFFECTS TO PRODUCE CONTINUED AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS. THE MODEST RISK OF NUISANCE FLOODING WILL CONTINUE UNTIL WEDNESDAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED 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 San Juan radar (TJUA), 117 km away, was scanning. The volume nearest the first event began at 18:22 UTC.
1 tornado. Local standard time, as filed.
A tornado was reported at Barrio Playa in the A asco municipality. Five telephone poles and one power pole were downed. Some tree branches were snapped.
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 historyThe tornado archive for Puerto Rico, 2007Warnings in Puerto Rico, August 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: 53883.