Showers and thunderstorms developed across the area due to lingering moisture. A TUTT low remained to the north of the area causing some instability.
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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.
Showers and thunderstorms developed across the area due to lingering moisture. A TUTT low remained to the north of the area causing some instability.
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 30, 10:42 AM AST, 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1042 AM AST WED JUL 30 2014 .UPDATE...NO CHANGES TO PREV...A FEW ISOLATED SHOWERS BEGINNING TO DEVELOP...AS EXPECTED THROUGH THE AFTERNOON. && .AVIATION...NO CHANGES...VFR CONDITIONS TODAY AT ALL TAF SITES XCPT AT JBQ WHERE A TSRA IS POSSIBLE BETWEEN 18Z-21Z. WINDS MAINLY SE 10-15 KT. && .PREV DISCUSSION... /ISSUED 544 AM AST WED JUL 30 2014/ SYNOPSIS...SURFACE HIGH PRESSURE ACROSS THE WEST CENTRAL ATLANTIC IS STILL EXPECTED TO RETREAT NORTH AND INTO THE NORTHERN ATLANTIC BY THURSDAY MORNING...LEAVING A SURFACE LOW ACROSS THE CENTRAL ATLANTIC AND RELAXING THE PRESSURE GRADIENT WHILE THE LOCAL AREA STAYS UNDER AN EAST SOUTHEAST TRADE WIND FLOW. SHOWERS AND THUNDERSTORM DEVELOPMENT EXPECTED TODAY AND THURSDAY MAINLY ACROSS THE NORTHWESTERN QUADRANT OF PR...WITH SOME BUT NOT MUCH RAINFALL EXPECTED ELSEWHERE FOR THE NEXT FEW DAYS. A TUTT LOW NORTH OF THE REGION AND A WEAKLY INDUCED LOW LEVEL TROUGH WILL SHIFT FURTHER NORTH AND WEST OF THE NORTHEASTERN CARIBBEAN THROUGH THE LATTER PART OF THE WEEK. AN AREA OF LOW PRESSURE AND ASSOCIATED TROPICAL WAVE NEAR 44 WEST IS FORECAST TO FURTHER DEVELOP OVER THE NEXT FEW DAYS AND REACH THE LESSER ANTILLES BY THE END OF THE WORK WEEK. DISCUSSION...A PATCH OF DRIER AIR IS EXPECTED TO MOVE IN TODAY ACROSS THE LOCAL AREA. HOWEVER THERE IS STILL ENOUGH MOISTURE TO CAUSE SHOWERS AND THUNDERSTORMS ACROSS THE NORTHWESTERN QUADRANT OF PR IN THE AFTERNOON HOURS. THE TUTT LOW IS EXPECTED TO REMAIN TO THE NORTH OF THE ISLANDS CAUSING SOME INSTABILITY ALOFT. SINCE THE PRESSURE GRADIENT IS EXPECTED TO LOOSEN QUITE A BIT ON THURSDAY...THE SHOWER AND THUNDERSTORMS THAT DO DEVELOP ARE EXPECTED TO MOVE SLOWLY AND ALSO GIVE THE EASTERN INTERIOR SECTIONS OF PR A SLIGHTLY HIGHER CHANCE OF SHOWERS ON THURSDAY AFTERNOON. WEAK SURFACE INDUCED TROUGH IS EXPECTED TO PASS OVER THE AREA ON FRIDAY...THIS WILL INCREASE AVAILABLE MOISTURE EVEN MORE AND ONCE AGAIN HELP WITH THE DEVELOPMENT OD SHOWERS AND THUNDERSTORMS ACROSS THE NORTHWESTERN SECTIONS OF PR WHILE EASTERN PR MAY OBSERVE SCATTERED SHOWERS. AN AREA OF LOW PRESSURE NOW LOCATED AROUND LONGITUDE 44 WEST LOOKS LIKE IT HAS LIMITED SHOWER AND THUNDERSTORM ACTIVITY BUT IT DOES SEEM TO BE WELL ORGANIZED. THE NATIONAL HURRICANE CENTER GIVES IT A 70 PERCENT OF IT DEVELOPING INTO A TROPICAL CYCLONE WITHIN THE NEXT 48 HOURS. THE EXPECTED IMPACTS OVER THE WEEKEND FOR THE LOCAL ISLANDS ARE STILL UNCERTAIN. HOWEVER AT THIS TIME...MODEL GUIDANCE SEEM TO AGREE A BIT MORE WITH ONE ANOTHER AND HAS THIS SYSTEM PASSING VERY CLOSE TO THE NORTHERN USVI. THIS SCENARIO WOULD GIVE NORTHEASTERN PR AND THE NORTHERN USVI SOME MUCH NEEDED RAIN. HOWEVER...CONFIDENCE IS LOW IN THIS FORECAST AS WE ARE STILL UNSURE OF WHEN WILL CYCLOGENESIS WILL OCCUR AND HOW IT WILL EVOLVE OVER THE NEXT SEVERAL DAYS. AVIATION...VFR CONDITIONS TODAY AT ALL TAF SITES XCPT AT JBQ WHERE A TSRA IS POSSIBLE BETWEEN 18Z-21Z. WINDS MAINLY SE 10-15 KT XCPT WESTERLY AT JMZ AROUND 10 KT. LOW PRES OVR THE CNTRL ATLC LIKELY TO BECOME TD#3 TONIGHT OR THU AND PASS OVER THE LEEWARD ISLANDS SAT AFTERNOON AND NEAR OR TO THE NE OF THE USVI LATE SAT NIGHT WITH IFR CONDITIONS LIKELY IN HEAVY SHOWERS AND T-STORMS OVR LEEWARD AND USVI TERMINALS. MARINE...SEAS UP TO 4 FEET AND WINDS UP TO 17 KNOTS ARE EXPECTED OVER THE COASTAL WATERS TODAY. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 77 88 77 / 10 10 20 30 STT 89 78 89 78 / 20 20 20 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 15/71
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE SAN JUAN PR 632 AM AST WED JUL 30 2014 AMZ710>745-PRZ001>013-311045- 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- 632 AM AST WED JUL 30 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY AN AREA OF LOW PRESSURE LOCATED WELL EAST OF THE SOUTHERN WINDWARD ISLANDS WILL LIKELY BECOME A TROPICAL CYCLONE TONIGHT OR THURSDAY. THIS SYSTEM IS EXPECTED TO MOVE GENERALLY WEST-NORTHWESTWARD AROUND 15 MPH DURING THE NEXT SEVERAL DAYS REACHING THE NORTHEAST CARIBBEAN EARLY SUNDAY MORNING. LATEST GUIDANCE SUGGESTS THAT THE HEAVIEST RAINS ASSOCIATED WITH THIS SYSTEM WILL REMAIN GENERALLY TO THE NORTHEAST OF THE AREA BUT COULD AFFECT NORTHEAST PUERTO RICO. ROUGH SEAS AND STRONG WINDS CAN ALSO BE EXPECTED OVER THE ATLANTIC COASTAL WATERS SATURDAY NIGHT AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-311045- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 632 AM AST WED JUL 30 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. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY AN AREA OF LOW PRESSURE LOCATED WELL EAST OF THE SOUTHERN WINDWARD ISLANDS WILL LIKELY BECOME A TROPICAL CYCLONE TONIGHT OR THURSDAY. THIS SYSTEM IS EXPECTED TO MOVE GENERALLY WEST-NORTHWESTWARD AROUND 15 MPH DURING THE NEXT SEVERAL DAYS REACHING THE NORTHEAST CARIBBEAN EARLY SUNDAY MORNING. LATEST GUIDANCE SUGGESTS THAT THE HEAVIEST RAINS ASSOCIATED WITH THIS SYSTEM WILL AFFECT ALL OF THE U.S. VIRGIN ISLANDS SATURDAY AND SATURDAY NIGHT. ROUGH SEAS AND STRONG WINDS CAN ALSO BE EXPECTED OVER THE ATLANTIC COASTAL WATERS SATURDAY NIGHT AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 35 km away, was scanning. The volume nearest the first event began at 14:59 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was sighted from Humacao looking to the southeast. No damages were reported.
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: 537453.