A moist southeast flow combined with daytime heating and a weak upper level trough to produce scattered to numerous showers with strong thunderstorms across Puerto Rico.
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.
A moist southeast flow combined with daytime heating and a weak upper level trough to produce scattered to numerous showers with strong thunderstorms across 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 Aug 10, 5:48 AM AST, 6 hours 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 548 AM AST TUE AUG 10 2010 .SYNOPSIS...GENERALLY UNSETTLED WEATHER IS EXPECTED TO PERSIST ACROSS PUERTO RICO AND THE U.S. VIRGIN ISLANDS THROUGH THE END OF THE WEEK. && .DISCUSSION...LATEST PW ESTIMATES...ALONG WITH 00Z SOUNDING DATA FROM YESTERDAY EVENING...INDICATE A VERY MOIST AIR MASS PERSISTING ACROSS THE REGION. MORNING PERCEPTIBLE WATER VAPOR ESTIMATE NOW IN EXCEEDENCE OF 2.5 INCHES...AS THE TUTT LOW TO THE NORTH OF THE REGION CONTINUES TO HELP DRAW DEEP TROPICAL MOISTURE NORTHWARD ACROSS THE LOCAL ISLANDS. EXPECT THIS AMPLE MOISTURE...COMBINED WITH A CONDITIONALLY UNSTABLE ATMOSPHERE AND FAVORABLE UPPER LEVEL CONDITIONS...TO RESULT IN AN ACTIVE WEATHER DAY ACROSS THE LOCAL ISLANDS. SO FAR THIS MORNING...SHOWER ACTIVITY HAS BEEN LIMITED TO THE LOCAL COASTAL WATERS AND EASTERN SECTIONS OF PUERTO RICO...WITH A LARGE AREA OF STRONG THUNDERSTORMS OBSERVED THE LOCAL CARIBBEAN WATERS. AS THE SUN RISES...EXPECT LOCALLY DRIVEN SHOWER ACTIVITY TO DEVELOP BY LATE MORNING OR EARLY AFTERNOON...AS THICKEST CLOUD COVER THIS MORNING WILL REMAIN ACROSS THE LOCAL WATERS AND SHOULD NOT SIGNIFICANTLY AFFECT SURFACE HEATING ACROSS THE ISLAND. WITH EAST SOUTHEASTERLY WIND FLOW IN RESPONSE TO AREA OF LOW PRESSURE TRYING TO DEVELOP NEAR 50 WEST...STEERING FLOW SHOULD BE TOWARDS THE NORTHWEST TODAY...WHICH SHOULD FAVOR THE SAN JUAN METRO AREA AS WELL AS NORTHWESTERN PUERTO RICO LATER IN THE DAY. PW VALUES ARE EXPECTED TO HOLD ABOVE 2 INCHES THROUGH THE END OF THE WEEK...BEFORE SHARPLY DROPPING OFF OVER THE UPCOMING WEEKEND ACCORDING TO LATEST GFS...WITH TUTT LOW EVENTUALLY STARTING TO FILL AND LIFT NORTHEASTWARD BY FRIDAY. WENT AHEAD AND INCREASED EXPECTED WEATHER THROUGH THE END OF THE WEEK...WITH NO SIGNIFICANT CHANGES BEYOND. && .AVIATION...A VERY MOIST AND UNSTABLE AIR MASS WILL INDUCE THE FORMATION OF SHRA/TSRA ACROSS MOST OF PR. THIS ACTIVITY WILL PRODUCE OCCASIONAL PERIODS OF MVFR/IFR CONDS... WITH MOUNTAIN OBSCURATIONS IN HIGHER TERRAIN. LLVL WINDS WILL CONTINUE FROM THE EAST SOUTHEAST AT 10 TO 15 KTS. && .PRELIMINARY POINT TEMPS/POPS... SJU 88 78 89 78 / 60 60 60 20 STT 89 80 89 80 / 70 60 60 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 10/04
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 548 AM AST TUE AUG 10 2010 AMZ710>745-PRZ001>013-111000- 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- 548 AM AST TUE AUG 10 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL INCREASE DURING THE DAY AS A LOW LEVEL TROUGH MOVES ACROSS THE AREA. LOCALIZED AREAS OF URBAN AND SMALL STREAM FLOODING WILL BE POSSIBLE. SHOWERS AND THUNDERSTORMS WILL DIMINISH OVERNIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-111000- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 548 AM AST TUE AUG 10 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL INCREASE DURING THE DAY AS A LOW LEVEL TROUGH MOVES ACROSS THE LOCAL AREA. LOCALIZED AREAS OF URBAN AND GUT FLOODING WILL BE POSSIBLE. SHOWERS AND THUNDERSTORMS WILL DIMINISH OVERNIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 32 km away, was scanning. The volume nearest the first event began at 15:50 UTC.
3 flood, 2 flash flood. Local standard time, as filed.
Martinez Nadal Avenue was reported flooded in the municipality of Guaynabo.
Road 2 with intersection with Los Corazones Avenue was reported flooded.
Road Doncella was reported flooded at Urb. Sultana in Mayaguez.
A flash flood fatality was reported in Las Tinajas river in Ceiba. USGS river Fajardo sensor recorded a crest of half a foot between 238-253 pm.
Runoff from heavy rainfall on the headwaters of the Fajardo river, caused the river overflow its banks, flooding Highway 3 at the intersection with PR53.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Flash Flood, Ceiba | 2010-08-10 | 21 | Male | In Water | Direct |
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, August 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: 256648, 256649, 256670, 256650, 256641.