A Tropical Wave combined with an upper level trough to produced scattered showers with isolated strong thunderstorms over the Northeast section of Puerto Rico.
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The episode as NWS SJU wrote it up.
A Tropical Wave combined with an upper level trough to produced scattered showers with isolated strong thunderstorms over the Northeast section of 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 Jul 3, 4:37 AM AST, 3 hours 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 437 AM AST THU JUL 3 2014 .DISCUSSION...WEAK TROPICAL WAVE TO ARRIVE TODAY. SHOWERS CURRENTLY ARE OVER OPEN WATERS AND IN ADVANCE OF THE 700 MB TROUGH AXIS...WHICH ARRIVES AT USVI ABOUT NOON SO BEST CHANCE OF SHOWERS MAY BE DURING MORNING. THESE SHOWERS ARE SMALL WHILE MOVING QUICKLY (25-30 KT) AND WILL NOT YIELD MUCH RAINFALL. A SIMILAR WAVE CURRENTLY ABOUT 45W IS DUE TO ARRIVE ON SAT. CONTAINING ONLY A MODERATE LEVEL OF PRECIPITABLE WATER IT WILL ALSO IS NOT EXPECTED TO PRODUCE RAINFALL IN QUANTITIES MORE TYPICAL FOR THIS TIME OF SEASON. DRIER AIR ARRIVES ON FRI BUT ESPECIALLY MON/TUE AS ANOTHER ROUND OF SAHARAN AIR/DUST IS MODELED TO REACH THE ISLANDS. && .AVIATION...VFR CONDITIONS ARE EXPECTED TO PREVAIL ACROSS THE LOCAL TERMINALS THROUGH THE FORECAST PERIOD. PASSING SHRA OVER THE AREA WILL CAUSE VCSH ACROSS MOST OF THE LOCAL TERMINALS WITH TSRA DEVELOPING ACROSS WESTERN PR AFTER 03/17Z...CAUSING INCREASE IN CLOUDINESS OVER PR AND LIKELY VCSH/VCTS FOR TJBQ AND TJMZ. SFC WINDS WILL BE AROUND 10 KTS UNTIL 03/13Z...INCREASING TO 10-20 KTS THEREAFTER FROM THE EAST WITH SEA BREEZE VARIATIONS. && .MARINE...WINDS UP TO 20 KNOTS ON CARIBBEAN AND JUST OFFSHORE OF NORTHWEST PR COAST WILL PRODUCE SEAS UP TO 5-6 FEET AT TIMES TODAY AND THROUGH THE HOLIDAY WEEKEND. LONG FETCH SWELLS OF 6-7 FEET ACROSS THE TROPICAL ATLANTIC WILL BE MUTED AT THE LEEWARD ISLANDS AND WILL NOT TRANSLATE WELL TO PR/USVI. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 81 92 79 / 20 30 30 30 STT 89 79 90 80 / 20 30 30 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 25/54
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 604 AM AST THU JUL 3 2014 AMZ710>745-PRZ001>013-041015- 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- 604 AM AST THU JUL 3 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 AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-041015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 604 AM AST THU JUL 3 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...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 36 km away, was scanning. The volume nearest the first event began at 12:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
A 38 kt convective wind gust accompanied by showers was observed at San Juan ASOS TJSJ.
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: 536271.