Flood, Guaynabo
- When
- June 29, 1:10 PM AST to 2:45 PM AST
- Where
- Guaynabo County, 7.16 mi NW of Guaynabo to 6.95 mi NW of Guaynabo
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.403, -66.108
Martinez Nadal avenue was reported flooded.
Flash Flooding and Flood in Puerto Rico, June 29, 2012
S Virgin Islands. After intense solar heating thunderstorms formed explosively and left up to five inches or rain from northern Trujillo Alto to northern Bayamon.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 3
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.
What happened
The episode as NWS SJU wrote it up.
Moisture from the back side of an upper level trough moved over Puerto Rico and the U.S Virgin Islands. After intense solar heating thunderstorms formed explosively and left up to five inches or rain from northern Trujillo Alto to northern Bayamon.
What forecasters said that day
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 Jun 29, 9:54 AM AST, 3 hours 16 minutes earlier.
Area forecast discussion, Jun 29, 9:54 AM AST, 3 hours 16 minutes before
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE SAN JUAN PR 954 AM AST FRI JUN 29 2012 .SYNOPSIS...A TUTT AXIS STRETCHES FROM THE CNTRL ATLC SW ALONG 17N. TUTT WILL RETROGRESS TO THE WRN CARIB BY EARLY NEXT WEEK. UPPER LEVEL RIDGE WILL THEN BUILD ACROSS THE AREA ON MON AND HOLD THRU MUCH OF NEXT WEEK. A TROPICAL WAVE WILL MOVE ACROSS THE ERN CARIB SEA MON. && .DISCUSSION...ATMOS LOOKS PRETTY UNSTABLE TODAY AS SEEN ON 12Z JSJ RAOB AND IR ANIMATION OF TSTMS CLUSTERS ACROSS THE ATLC WATERS NORTH OF 20N. CONVECTION SHOULD FIRE UP ACROSS WRN PR THIS AFTERNOON AS SUGGESTED BY HI-RES MODELS AND TRACK MAINLY WWD. THERE IS DRY AIR AT MID LEVELS AS SEEN ON BOTH 12Z JSJ RAOB AND GOES SOUNDER INSTRUMENT WHICH CAUSES SOME CONCERN ABOUT THE POTENTIAL FOR DOWNBURST WINDS. MID LEVELS APPEAR TOO WARM FOR ANY SIG HAIL. UNFORTUNATELY BOTH RADARS ARE DOWN BUT PROBLEM HAS BEEN ESCALATED. HOPEFULLY...WILL GET AT LEAST ONE BACK BEFORE CONVECTION FIRES UP. GOES SATELLITE IS IN UNDER RSO MODE FOR SEVERE WX IN THE MIDWEST. IMAGERY IS COMING EVERY 7.5 MINUTES. && .AVIATION...LIKELY TSTMS AT JMZ WITH HVY RAIN AND MVFR CIGS AND VCTS AT JBQ. OTHERWISE...VFR AT ALL OTHER SITES. && .MARINE...SEAS 3-5 FT ACROSS THE WATERS AND WINDS 15-20 KNOTS. && .PRELIMINARY POINT TEMPS/POPS... SJU 91 79 91 80 / 30 10 10 20 STT 90 79 91 82 / 30 20 20 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 64/64
Hazardous weather outlook, Jun 29, 6:17 AM AST, 6 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 617 AM AST FRI JUN 29 2012 AMZ710>745-PRZ001>013-301100- 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- 617 AM AST FRI JUN 29 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SAHARAN DUST IS LEAVING THE AREA AND WITH THAT THE POTENTIAL FOR CONVECTION INCREASES. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP MAINLY ACROSS WESTERN PUERTO RICO. SOME OF THESE STORMS CAN PRODUCE LOCALLY HEAVY DOWNPOURS AND SOME URBAN AND SMALL STREAM FLOODING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY TROPICAL WAVE IS MOVING IN FROM THE EAST...BRINGING AN INCREASE IN MOISTURE AND INSTABILITY. SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THIS TROPICAL WAVE MAY AFFECT THE LOCAL AREA ON SUNDAY AND MONDAY. .SPOTTER INFORMATION STATEMENT... ANY FLOODING REPORTS WILL BE APPRECIATED. AMZ715-725-VIZ001-002-301100- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 617 AM AST FRI JUN 29 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY TROPICAL WAVE IS MOVING IN FROM THE EAST...BRINGING AN INCREASE IN MOISTURE AND INSTABILITY. SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THIS TROPICAL WAVE MAY AFFECT THE LOCAL AREA ON SUNDAY AND MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The radar
The San Juan radar (TJUA), 32 km away, was scanning. The volume nearest the first event began at 17:14 UTC.
Event by event
2 flash flood, 1 flood. Local standard time, as filed.
Flash Flood, San Juan
- When
- June 29, 4:45 PM AST to 6:45 PM AST
- Where
- San Juan County, 2.35 mi WNW of San Juan to 2 mi WNW of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.388, -66.085
Jose de Diego avenue was closed near Fondo del Seguro del Estado due to flooding.
Flash Flood, San Juan
- When
- June 29, 4:45 PM AST to 6:45 PM AST
- Where
- San Juan County, 1.11 mi NNE of San Juan to 1.09 mi NNE of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.395, -66.044
Flooded was reported at 65th Infanteria Avenue.
What these are
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Winds in Virginia, June 29 to 30, 2012
- Hail and Damaging Winds in West Virginia, June 29, 2012
- Damaging Winds in Virginia, June 29, 2012
- Hail and Damaging Winds in New Jersey, June 29 to 30, 2012
- Damaging Winds and Lightning Strike in Ohio, June 29, 2012
- Hail and Damaging Winds in Ohio, June 29, 2012
- Flash Flood and Hail in Ohio, June 29, 2012
- Hail and Damaging Winds in Maryland, June 29, 2012
- Damaging Winds in Virginia, June 29, 2012
- Excessive Heat and Heat in South Carolina, June 29 to 30, 2012
- Hail and Damaging Winds in Ohio, June 29, 2012
- Excessive Heat and Heat in Pennsylvania, June 29, 2012
More
Every storm in Puerto Rico in 2012Every state in 2012This day in weather historyWarnings in Puerto Rico, June 2012
Sources
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: 391024, 391026, 391028.