Some showers and thunderstorms with heavy rain affected the area for many hours and caused flooding of urban and poor drainage areas.
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.
Some showers and thunderstorms with heavy rain affected the area for many hours and caused flooding of urban and poor drainage areas.
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 21, 10:57 AM AST, 3 hours 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1057 AM AST MON JUL 21 2014 .UPDATE... NO CHANGES TO INHERITED FORECAST PACKAGE AND REASONING AT THIS TIME. MOST OF THE PASSING SHOWERS ACROSS THE COASTAL WATERS NORTH AND EAST OF PUERTO RICO AND VIRGIN ISLANDS...CONTINUED TO DIMINISH BY THE LATE MORNING HOURS. STILL EXPECTED ISOLATED TO SCATTERED SHOWERS AND POSSIBLY AN ISOLATED THUNDERSTORM OVER PARTS OF THE INTERIOR AND WEST SECTION OF PUERTO RICO LATER THIS AFTERNOON. MOSTLY SUNNY AND SLIGHTLY HAZY CONDITIONS WILL CONTINUE ACROSS THE REMAINDER OF THE ISLANDS. LATEST SATELLITE IMAGERY AND NAAPS AEROSOL PRODUCT ALSO SUGGEST DECREASE IN SUSPENDED SAHARAN DUST PARTICULATES ACROSS THE REGION TODAY...WITH IMPROVING CONDITION THROUGH TUESDAY AND WEDNESDAY. && .AVIATION UPDATE...VFR CONDS CONTINUED ACROSS THE FLYING AREA AND AT ALL TAF SITES THIS MORNING. NO CHG TO PREVIOUS AVN DISCUSSION ATTM. && .MARINE UPDATE...LATEST DATA FROM SURROUNDING NDBC BUOYS AND LOCAL OBSERVATIONS SUGGEST MODERATE TO LOCALLY FRESH EASTERLY TRADE WINDS CONTINUED ACROSS THE LOCAL WATERS...WITH SEAS OF BETWEEN 3-5 FEET. SMALL CRAFT OPERATORS SHOULD CONTINUE TO EXERCISE CAUTION MAINLY DUE TO WINDS UP TO 19 KNOTS OR SO. && .PREV DISCUSSION... /ISSUED 331 AM AST MON JUL 21 2014/ DISCUSSION...GENERALLY DRY AIR WILL PASS OVER THE LOCAL ISLANDS THROUGH EARLY THU THOUGH NOT WITHOUT THE USUAL ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS FOR WESTERN INTERIOR PR. GUIDANCE DAILY MAX TEMPERATURES CONTINUE ON LOW SIDE SO BOOSTED THOSE 1-2 DEG F EACH DAY. TROPICAL WAVE WITH A LOW CENTERED 11N/38W CURRENTLY EMBEDDED IN ITCZ AND MOVING W 10 KT. BOTH 00Z ECMWF AND GFS ACCELERATE IT WITHIN 48-72 HOURS TO ABOUT 17 KT TOWARDS WNW SO THAT IT WOULD PASS OVER LOCAL AREA VERY LATE ON THU. GFS ALSO KEEPS IT A RELATIVELY STRONG WAVE AND EVEN HAS SOME UPPER LEVEL DIVERGENCE OVER ITS TOP. WHILE DEVELOPMENT INTO A STORM IS NOT EXPECTED THE POTENTIAL CONVERGENT/DIVERGENT COUPLET AND PRECIPITABLE WATER WELL IN EXCESS OF 2 INCHES AS THE GFS INDICATES WARRANTS CAREFUL MONITORING FOR POSSIBLE HEAVY THUNDERSTORMS. 00Z GFS IS A SIGNIFICANT DEPARTURE FROM ITS EARLIER RUNS. THIS PAST SAT IT WAS EXPECTING THE WAVE TO PASS BY ON THIS COMING SAT AND HIGHLY SHEARED. EVEN THE 12Z AND 18Z RUNS FROM YESTERDAY INDICATED A FRI ARRIVAL...AND WITH NOT NEARLY THIS MUCH PRECIPITABLE WATER OR CONVECTIVE POTENTIAL. WILL HAVE TO WATCH FOR SUBSEQUENT MODEL RUNS TO SEE IF THIS TREND CONTINUES SINCE THE GFS HAS NOT HANDLED IT WELL SO FAR. FOR NOW...HAVE KEPT PROBABILITY OF PRECIPITATION IN CHANCE CATEGORY PARTLY BECAUSE OF THE UNCERTAINTY IN BOTH TIMING AND THE QUESTIONABLE STRENGTH. AVIATION...MOSTLY VFR CONDITIONS EXPECTED AT ALL TERMINALS WITH BRIEF SHRA IN AND AROUND JSJ/IST AND NCM THROUGH THE MORNING HOURS. SHRA/TSRA WILL DEVELOP ACROSS WESTERN PR AFTER 21/17Z...AND MAY AFFECT TJMZ AND TJBQ...RESULTING IN PERIODS OF MVFR CONDS AND MOUNTAIN OBSCURATIONS. SAHARAN DUST IS PRESENT...CAUSING HAZY SKIES BUT VISIBILITIES SHOULD REMAIN P6SM. WINDS WILL BE FROM THE EAST TO E-SE AT ABOUT 15 KTS. MARINE...SMALL CRAFT SHOULD BE CAUTIOUS DUE TO LOCALLY FRESH TRADE WINDS UP TO 19 KNOTS THROUGH AT LEAST TUE...WITH SEAS CONTINUING AT 5 FEET OR LESS. FIRE WEATHER...MOSTLY DRY CONDITIONS AND LIMITED NUMBER OF SHOWERS...ESPECIALLY SOUTHERN PR SLOPES NEXT SEVERAL DAYS WILL REQUIRE MONITORING FOR POSSIBLE STATEMENTS. SO FAR...DRIEST DAY APPEARS TO BE WED WHILE THERE IS SOME POTENTIAL FOR STRONG WINDS THAT DAY TOO. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 78 90 79 / 10 10 10 20 STT 90 79 90 80 / 20 10 10 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 09/25
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 610 AM AST MON JUL 21 2014 AMZ710>745-PRZ001>013-221015- 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- 610 AM AST MON JUL 21 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY FIRE WEATHER CONDITIONS ARE POSSIBLE ON WEDNESDAY AS LOW HUMIDITY AND STRONG TRADE WINDS MAY COMBINE TO INCREASE FIRE DANGER. A TROPICAL WAVE IS EXPECTED TO PASS THROUGH THE AREA...POSSIBLY CAUSING PERIODS OF LOCALLY HEAVY RAINFALL AND SUDDEN WIND GUSTS ON THURSDAY NIGHT AND FRIDAY ALONG WITH DANGEROUS LIGHTNING. ON SURROUNDING WATERS THIS WOULD CAUSE LOCALLY HIGHER SEAS AS WELL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-221015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 610 AM AST MON JUL 21 2014 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...TUESDAY THROUGH SUNDAY A TROPICAL WAVE IS EXPECTED TO PASS THROUGH THE AREA...POSSIBLY CAUSING PERIODS OF LOCALLY HEAVY RAINFALL AND SUDDEN WIND GUSTS ON THURSDAY NIGHT AND FRIDAY ALONG WITH DANGEROUS LIGHTNING. ON SURROUNDING WATERS THIS WOULD CAUSE LOCALLY HIGHER SEAS AS WELL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Urban flooding was reported at Western Plaza. A car was stranded in water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2014Every state in 2014This day in weather historyWarnings in Puerto Rico, July 2014
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: 537354.