Sufficient low level moisture combined with good dynamics associated with an upper level low to the north of Puerto Rico, resulted in fairly widespread showers and thunderstorms over the interior and northern half of Puerto Rico.
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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.
Sufficient low level moisture combined with good dynamics associated with an upper level low to the north of Puerto Rico, resulted in fairly widespread showers and thunderstorms over the interior and northern half of Puerto Rico.
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 Sep 20, 6:31 AM AST, 5 hours 4 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE SAN JUAN PR 631 AM AST THU SEP 20 2007 .SYNOPSIS...A SURFACE TROUGH EXTENDED FROM NEAR 24 NORTH...65 WEST SOUTHWESTWARD TO THE NORTHEAST COAST OF PUERTO RICO...AND THEN CONTINUING WEAKLY SOUTHWESTWARD TO THE WATERS JUST SOUTH OF MONA ISLAND THIS MORNING. THIS TROUGH WILL CONTINUE TO DRIFT NORTH NORTHWEST ACROSS THE LOCAL AREA TODAY...WITH ACTIVE WEATHER EXPECTED TO CONTINUE TO OCCUR ALONG AND EAST OF THE TROUGH. A TROPICAL WAVE ALIGNED SOUTHWEST TO NORTHEAST ACROSS THE TROPICAL ATLANTIC EAST OF THE LESSER ANTILLES WILL MOVE SLOWLY NORTHWEST THROUGH THE WEEKEND...AND HELP TO MAINTAIN A WEAK PRESSURE GRADIENT ACROSS THE LOCAL REGION. && .DISCUSSION...MOST OF THE SHOWERS AND THUNDERSTORMS AFFECTING THE ATLANTIC LOCAL WATERS HAVE MOVE NORTH AND AWAY OR DISSIPATED. THE DOPPLER RADAR IS SHOWING ISOLATED TO SCATTERED SHOWERS OVER THE NEAR SHOWERS CARIBBEAN WATERS AND ALONG THE SOUTHERN COAST OF PUERTO RICO. A SURFACE TROUGH CONTINUES TO DOMINATE OUR LOCAL FORECAST AREA...AND THEREFORE EXPECT ANOTHER ACTIVE WEATHER AFTERNOON TODAY...WITH SHOWERS AND THUNDERSTORMS MAINLY AFFECTING THE CENTRAL INTERIOR...WESTERN INTERIOR...NORTH CENTRAL AND NORTHWESTERN SECTIONS OF PUERTO RICO. EXPECT SLIGHTLY DRIER CONDITIONS WITH LESS OVERALL SHOWER ACTIVITY FRIDAY AND SUNDAY. && .MARINE...ALTHOUGH A SMALL NORTHEAST SWELL WILL CONTINUE TO AFFECT THE NORTHERN COAST OF PUERTO RICO...LIGHT WINDS WILL CONTINUE TO PRODUCE TRANQUIL CONDITIONS ACROSS ALL LOCAL WATERS. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 79 89 79 / 20 40 40 30 STT 86 81 86 81 / 50 50 50 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 99/10
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 500 AM AST THU SEP 20 2007 PRZ001>013-AMZ710>750-211000- 500 AM AST THU SEP 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT... DIURNAL AND LOCAL SEABREEZE EFFECTS...AIDED BY AN UPPER LEVEL LOW JUST NORTH OF THE AREA WILL PRODUCE AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE MUCH OF THE NORTHERN HALF OF THE ISLAND...ESPECIALLY THE NORTH CENTRAL TO NORTHWESTERN SECTIONS. BECAUSE OF AMPLE MOISTURE...AND WEAK WIND FLOW...SOME SHOWERS AND THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAINFALL...WHICH COULD LEAD TO URBAN AND SMALL STREAM FLOODING. RESIDENTS...TOURISTS...AND MOTORISTS SHOULD KEEP ABREAST OF THE LATEST STATEMENTS AND WARNINGS FROM THE NATIONAL WEATHER SERVICE AND TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY IF THUNDERSTORMS DEVELOP IN YOUR VICINITY. .DAYS TWO THROUGH SEVEN... AFTERNOON DIURNAL SEABREEZE SHOWERS AND STORMS MAY AFFECT THE INTERIOR AND WESTERN PORTIONS OF THE ISLAND THROUGHOUT THE PERIOD. AS A RESULT...LOCALIZED URBAN AND SMALL STREAM FLOODING WILL REMAIN POSSIBLE IN SOME AREAS. IF YOU ARE IN THE PATH OF A STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY. VIZ001-002-AMZ710>730-211000- 500 AM AST THU SEP 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT... AMPLE MOISTURE AND THE EFFECTS OF AN UPPER LEVEL TROUGH JUST NORTH OF THE AREA WILL PRODUCE SHOWERS AND THUNDERSTORMS WITH THE POTENTIAL OF PRODUCING LOCALLY HEAVY RAINFALL THIS AFTERNOON. THE STRONGEST STORMS SHOULD DEVELOP TO THE NORTHWEST OF THE LARGER U.S. VIRGIN ISLANDS. MARINERS SHOULD USE EXTRA CAUTION OVER THESE AREAS. SOME STORMS MAY EXTEND INTO THE WESTERN PORTIONS OF THE LARGER ISLANDS. .DAYS TWO THROUGH SEVEN... NO SIGNIFICANT WIDESPREAD RAINFALL EVENTS ARE EXPECTED AT THIS TIME. .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 national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Emergency Management reported several streets flooded on Santurce, Hato Rey and Puerto Nuevo.
Emergency Management from Areibo reported several roads flooded over Arecibo municipality.
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, September 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: 60332, 60333.