S. Virgin Islands on Monday July 19, generating numerous showers and isolated thunderstorms, some with very heavy rain.
Every event with a place to put it. Tap one for its entry below.
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.
An active tropical wave moved across Puerto Rico and the U.S. Virgin Islands on Monday July 19, generating numerous showers and isolated thunderstorms, some with very heavy rain. Weather conditions improved during the evening of Monday July 19, but by early morning July 20th, additional showers and thunderstorms resulted in flooding across much of the eastern half of Puerto Rico. Although by Tuesday morning July 20 the tropical wave axis had moved into Hispaniola, the wave itself was maintaining a broad area of disturbed weather, aided in part by an upper level low pressure system just north northwest of the local area. As a result, Tuesday July 20 was another very active weather day, with heavy rains persisting across the eastern half of Puerto Rico and additional shower and thunderstorm formation across the southwestern sections of Puerto Rico. On Wednesday July 21, local effects combined with available moisture behind the initial tropical wave to generate additional showers and thunderstorms across the eastern and northern sections of Puerto Rico. By this time the soils had become saturated and any additional rainfall greatly increased the chance for flash flooding. By late Thursday July 22, the islands were still dealing with the effects of several days of widespread rainfall. Even though this tropical disturbance, which later became Tropical Storm Bonnie, was now located over eastern Cuba, it was still able to generate another band of moisture which brought additional areas of rainfall across Puerto Rico and the U.S. Virgin Islands. USGS rain sensor at NSSR/Ceiba 3SE recorded 9.03 inches for the 24 hour period ending on July 20th, followed by Rio Grande de Loiza/San Lorenzo which recorded 7.31 inches.
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 Jul 19, 6:06 AM AST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 606 AM AST MON JUL 19 2010 .SYNOPSIS...A TROPICAL WAVE LOCATED JUST EAST OF THE U.S. VIRGIN ISLANDS EARLY THIS MORNING...WILL MOVE WEST NORTHWEST ACROSS THE REMAINDER OF THE LOCAL AREA TODAY THROUGH TONIGHT AND THEN SLOWLY AWAY FROM THE LOCAL REGION TUESDAY AND TUESDAY NIGHT. && .DISCUSSION...FOR TODAY THROUGH TONIGHT AND TUESDAY...TROPICAL WAVE AXIS APPEARS TO BE LOCATED JUST EAST OF THE U.S. VIRGIN ISLANDS EARLY THIS MORNING...AND WILL MOVE WEST NORTHWEST ACROSS THE REMAINDER OF THE LOCAL AREA TODAY THROUGH TONIGHT AND THEN SLOWLY AWAY FROM THE LOCAL REGION TUESDAY AND TUESDAY NIGHT. THIS WAVE AND ITS ASSOCIATED MOISTURE WILL INTERACT WITH LOCAL EFFECTS AND YET AGAIN FAVORABLE UPPER LEVEL CONDITIONS...TO PRODUCE ANOTHER ROUND OF ACTIVE WEATHER...WITH SHOWERS AND THUNDERSTORMS... PERIODS OF HEAVY RAINFALL...LIGHTNING AND LOCALLY STRONG AND GUSTY (SQUALLY) WINDS ACROSS THE LOCAL ISLANDS...TODAY THROUGH TONIGHT AND TUESDAY. STILL EXPECT URBAN AND SMALL STREAM FLOODING TO OCCUR WITH THIS WAVE PASSAGE AND THE POTENTIAL STILL EXISTS FOR AT LEAST SOME LOCALIZED FLASH AND RIVER FLOODING...AND THIS WILL CONTINUE TO BE CLOSELY MONITORED. ALTHOUGH EXPECT SIGNIFICANT DEVELOPMENT OF SHOWERS AND THUNDERSTORMS LOCALLY TODAY...GIVEN SOMEWHAT DISORGANIZED AND SPOTTY RADAR APPEARANCE AT THIS TIME... OPTED TO HOLD OFF ON A FLASH FLOOD WATCH. IN ADDITION...BANDS AND LINES OF THUNDERSTORMS COULD AGAIN DEVELOP...RESULTING IN SOME STRONG AND POTENTIALLY DAMAGING WIND GUSTS. LOOKING AHEAD...MOISTURE STILL APPEARS TO LINGER THROUGH LATE TUESDAY NIGHT/EARLY WEDNESDAY...WITH A BRIEF "DRIER" BREAK POSSIBLE DURING WEDNESDAY...FOLLOWED BY ANOTHER SURGE OF MOISTURE LATE WEDNESDAY AND WEDNESDAY NIGHT THROUGH MOST OF THURSDAY...WITH A SECOND "DRIER" BREAK INDICATED AGAIN FOR THURSDAY NIGHT AND FRIDAY. && .AVIATION...TROPICAL WAVE AXIS IS OVER ANEGADA PASSAGE (JUST EAST OF USVI) AND MOVING WEST NORTHWEST. IT WILL GIVE REGION ANOTHER DAY OF SHOWERS/THUNDER. HAVE TIMED MOST LIKELY TIMES OF CONVECTION IN TAFS ACCORDING TO PROXIMITY OF THE WAVE AND LOCATION OF BEST 700-500 MB VORTICITY ADVECTION ACCORDING TO NAM AND GFS MODELS. THIS LEVEL SEEMED TO WORK PRETTY WELL FOR WHERE CONVECTION OCCURRED ON SUNDAY. MIGHT EVEN NEED TO INCREASE MENTION OF SHOWERS IN MOST 12Z TAFS SINCE THERE ARE SO MANY PASSING OVER THE SURROUNDING WATERS ALREADY. MVFR EXPECTED IN SHOWERS WHILE MOUNTAIN OBSCURATIONS WILL BE COMMON. && .MARINE...GENERALLY EXPECT WINDS OF 13 TO 21 KNOTS AND SEAS OF 4 TO 9 FEET ACROSS THE REGIONAL WATERS THROUGH WEDNESDAY. A SMALL CRAFT ADVISORY IS IN EFFECT FOR MOST OF THE LOCAL COASTAL WATERS TODAY AND SMALL BOAT OPERATORS SHOULD EXERCISE CAUTION ACROSS THE REMAINDER OF THE WATERS. PLEASE REFER TO SJUCWFSJU FOR THE LATEST FORECAST DETAILS AND SMALL CRAFT ADVISORY DELINEATION. && .SITE SUPPORT...THE XXI CENTRAL AMERICAN AND CARIBBEAN SPORT GAMES MAYAGUEZ 2010 ARE UNDER WAY AND A SPECTACULAR OPENING CEREMONY WAS DELIVERED LATE SUNDAY AFTERNOON AND EARLY SUNDAY EVENING. THE GAMES WILL CONTINUE THROUGH SUNDAY AUGUST 1. WFO SAN JUAN WILL CONTINUE PROVIDING ON SITE AND IN OFFICE TEAM SUPPORT TO THE PUERTO RICO EMERGENCY MANAGEMENT AGENCY (PREMA) AND OTHER FEDERAL AGENCIES THROUGHOUT THIS EVENT. TEAM MEMBERS REMAIN ON SITE IN MAYAGUEZ AND AT THE WFO AND DAILY BRIEFINGS FOR EMERGENCY MANAGEMENT OFFICIALS WILL CONTINUE TODAY AT 9 AM. THE WEATHER FOR TODAY AND TONIGHT THROUGH TUESDAY LOOKS RATHER UNSETTLED ACROSS MOST OF THE GAME SITES...AS THE TROPICAL WAVE MOVES SLOWLY ACROSS THE LOCAL AREA. THE TODAY WILL BEGIN WITH A MIXTURE OF CLOUDINESS AND SUNSHINE WITH SCATTERED SHOWERS AND POSSIBLY A THUNDERSTORM OR TWO. HOWEVER...AS DEEPER MOISTURE CONTINUES TO SPREAD ACROSS THE LOCAL ISLANDS...SHOWERS AND THUNDERSTORMS WILL BECOME MORE PREVALENT AS THE DAY PROGRESSES... WITH SOME MOVING INTO SOUTH AND EAST SECTIONS OF PUERTO RICO... WHILE OTHER SHOWERS AND STORMS DEVELOP OVER THE CENTRAL AND WESTERN INTERIOR AND WEST SECTIONS OF THE ISLAND. THESE SHOWERS AND THUNDERSTORMS WILL LINGER INTO TONIGHT...WITH ADDITIONAL ACTIVE WEATHER EXPECTED TUESDAY. THE POTENTIAL EXISTS FOR FREQUENT LIGHTNING...HEAVY RAIN...BRIEF WIND GUSTS AND SOME MINOR LOW LYING FLOODING AND PONDING OF WATER ON ROADWAYS. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 77 87 77 / 70 70 70 70 STT 88 78 88 78 / 70 70 70 70 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...SMALL CRAFT ADVISORY AMZ710...715...722...725 AND 732. VI...SMALL CRAFT ADVISORY AMZ710...715...722...725 AND 732. && GV/BCS
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 701 AM AST MON JUL 19 2010 AMZ710>745-PRZ001>013-201115- SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR- NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST- WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES- THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS- 701 AM AST MON JUL 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS WILL BE NUMEROUS AND THUNDERSTORMS ISOLATED IN A VERY MOIST ATMOSPHERE. LOCALLY TORRENTIAL RAINS WILL OCCUR WHILE URBAN AREAS AND SMALL STREAMS WILL BE FLOODED IN A FEW SPOTS. WIND GUSTS FROM 25 TO 40 MPH WILL BE POSSIBLE IN PUERTO RICO...CULEBRA AND VIEQUES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE ON TUESDAY AS THE TROPICAL WAVE PASSES BY. URBAN AND SMALL STREAM FLOODING IS LIKELY IN AREAS AND A FEW PLACES MAY EXPERIENCE RISES IN MAIN-STEM RIVERS THAT APPROACH OR EXCEED FLOOD STAGES. ON WEDNESDAY THROUGH SATURDAY SHOWERS WILL GRADUALLY BECOME SCATTERED AND HEAVY RAIN WILL OCCUR ONLY IN ISOLATED LOCATIONS. LOCALLY GUSTY WINDS WILL STILL BE POSSIBLE IN THIS UNSTABLE MIX. .SPOTTER INFORMATION STATEMENT...SPOTTER REPORTS ARE ENCOURAGED. AMZ715-725-VIZ001-002-201115- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 701 AM AST MON JUL 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE AS A TROPICAL WAVE PASSES TODAY. URBAN AND SMALL STREAM FLOODING IS POSSIBLE ALONG WITH WIND GUSTS TO 25 TO 35 MPH NEAR THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED FLOODING WILL STILL BE POSSIBLE IN SHOWERS AND ISOLATED THUNDERSTORMS ON TUESDAY AS THE TROPICAL WAVE IS MOVING WEST. SHOWERS AND ISOLATED THUNDERSTORMS WILL BE SCATTERED FROM WEDNESDAY INTO THE WEEKEND. .SPOTTER INFORMATION STATEMENT...RAINFALL REPORTS GREATER THAN ONE INCH ARE ENCOURAGED.
The San Juan radar (TJUA), 39 km away, was scanning. The volume nearest the first event began at 14:05 UTC.
13 flash flood. Local standard time, as filed.
A house was reported flooded at Villas de Rio Grande.
A house was reported flooded at Urb. Vistas de San Lorenzo, Lirio road in the municipality of San Lorenzo.
A house was reported flooded at Barrio Quemados, Road 181, Km 1.0 in the municipality of San Lorenzo.
A house was reported flooded at Urb. Veve Calzada,behind JF Montalvo supermarket.
Road 3 was reported flooded behind Interamerican University in Fajardo. A car was also flooded.
Road 3,km 42, H 4 was flooded at Barrio Juan Martin, Florida sector.
Several roads were reported flooded at Urb. Las Vegas.
A house was flooded at Barrio Hucares, La Playa sector, Road 192,Km 4.0.
Several houses and roads were flooded at Urb. Puerto Real, Union Road in Fajardo.
A house was flooded at Urb. La Roca, near Las Croabas sector.
A house an the road was flooded at Puerto Real sector, Cometa road in Barrio Maternillo.
Road Garido Morales was reported flooded in the municipality of Fajardo.
River Fajardo was overflowing its banks and flooding PR3 and PR53 between the municipalities of Fajardo and Ceiba.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2010Every state in 2010This day in weather historyWarnings in Puerto Rico, July 2010
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: 248784, 248793, 249546, 249547, 249715, 249768, 249801, 249802, 249804, 249807, 249809, 249810, 254385.