Passing showers moved along eastern PR during the morning hours.
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The episode as NWS SJU wrote it up.
Passing showers moved along eastern PR during the morning hours.
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 24, 5:30 AM AST, 4 hours 30 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 530 AM AST Fri Aug 24 2018 .SYNOPSIS...An area of moisture will move into the area from the northeast bringing increased shower and thunderstorm activity. Weak low-level perturbances will cross the islands today and Sunday. Then a tropical wave will again increase shower and thunderstorm activity Tuesday night through Thursday. && .SHORT TERM...Today through Sunday... Variably cloudy skies prevailed across the local islands overnight and early this morning with passing showers observed across the U.S. Virgin Islands and the north and east coastal areas of Puerto Rico. However, rainfall accumulations associated with these showers were minimal. Coastal temperatures were in the upper 70s to low 80s under east northeast winds at 10 mph or less. An upper level trough will continue to slowly amplify into the forecast area, becoming the dominant weather feature during the weekend. This feature will enhance moisture transport as well as convective instability across the forecast area Saturday onwards. At lower levels, although an east northeast wind flow will prevail today, easterly winds will return by Saturday. Under the aformentioned pattern, continue to expect passing showers across the US Virgin Islands and the north and east coastal areas of Puerto Rico throughout the day with showers and thunderstorms developing over southwest Puerto Rico in the afternoon. Urban flooding is likely with the heaviest showers. As the trough aloft enhances moisture transport and convective instability, the chance for showers and thunderstorms will increase across the forecast area during the weekend. Showers and thunderstorms should remain focused across western areas of Puerto Rico Saturday afternoon, but by Sunday afternoon most areas should experience shower and thunderstorm activity. .LONG TERM...Monday through Friday... A weak trough will move through the area on Monday, but available moisture will be at its lowest value for the week at around 1.5 inches, so shower and thunderstorm activity will be fairly modest. Some of the thunderstorms will, however, be strong enough to cause localized urban and small stream flooding in western Puerto Rico. After Monday evening overall moisture begins to ramp up, reaching a peak of over 2 inches on Thursday evening. The tropical wave (currently moving out of Africa now) will roll through the area Wednesday and Thursday. The GFS is now showing the wave to be a little less well-defined, but moisture amounts have remained consistent, so we continue to forecast shower and thunderstorm activity increasing Wednesday into Thursday with diminishing activity in the early morning hours both days. This will mean that urban and small stream flooding will be likely in many areas during the afternoons and early evenings Wednesday and Thursday. The GFS had been forecasting very unstable conditions, however this latest 24/00Z run is showing only minus 7 for the lifted index (30/18Z) rather than minus 10 and this is consistent with the model's weakening characterization of the passing wave. There is a dry slot after the tropical wave that should move through Thursday night, but bubbles of moisture move through on Friday again to maintain favorable conditions for scattered showers during the morning and showers and thunderstorms in the west during the afternoon. && .AVIATION...VFR conditions are expected to prevail at all TAF sites with VCSH likely at TIST/TISX and TJSJ. Aft 24/16z, SHRA/TSRA expected across sw PR with mtn obscurations, and therefore brief periods of MVFR conds at TJMZ/TJPS can't be ruled out through 24/22z. ENE winds at around 15 knots with some sea breeze variations. && .MARINE...Some of the quietest marine conditions of the summer are upon us. Although winds will cause seas to rise briefly at times to 5 feet through Wednesday in exposed areas of the local waters, relatively tranquil conditions will continue. Then on Wednesday night and Thursday, the passing tropical wave will cause seas to rise to almost 7 feet. At this time small craft advisories may be necessary for the local outer waters. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 78 88 77 / 60 40 40 50 STT 89 80 89 78 / 60 40 40 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...OM LONG TERM....WS
Perspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 500 AM AST viernes 24 de agosto de 2018 AMZ710>745-PRZ001>013-250900- San Juan y Vecindad-Noreste-Sureste- Este Interior- Norte Central-Interior Central-Ponce y Vecindad- Noroeste- Oeste Interior-Mayaguez y Vecindad-Suroeste-Culebra- Vieques-Aguas cercanas y lejanas a la costa del Atlantico y Caribe- 500 AM AST viernes 24 de agosto de 2018 Esta perspectiva sobre las condiciones peligrosas del tiempo es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia Uno...Hoy y esta noche .Tronadas...Existe la probabilidad de tronadas con lluvia fuerte y rafagas de vientos esta tarde a traves de sectores del suroeste de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos. Deslizamientos de lodo son posibles. .Dias dos a siete...sabado a jueves Se espera riesgo de bajo a moderado de corrientes marinas a lo largo de las costas del norte y sur de Puerto Rico durante el fin de semana. A medida que una vaguada en los niveles altos de la atmosfera aumente la humedad e inestabilidad, la probabilidad de aguaceros y tronadas aumentara a traves del area de pronostico durante el fin de semana y hasta la proxima semana laboral. Por consiguiente, el riesgo de inundaciones urbanas y riachuelos aumentara. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar inundaciones y corrientes marinas al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-250900- San Tomas, San John e Islas Adyacentes- Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 500 AM AST viernes 24 de agosto de 2018 Esta perspectiva sobre las condiciones del tiempo peligrosas es para las Islas Virgenes Americanas y las aguas costeras adyacentes. .Dia Uno...Hoy y esta noche No se esperan condiciones atmosfericas peligrosas. .Dias dos a siete...sabado a jueves Se espera riesgo de bajo a moderado de corrientes marinas a lo largo de algunas playas de Santa Cruz durante el fin de semana. A medida que una vaguada en los niveles altos de la atmosfera aumente la humedad e inestabilidad, la probabilidad de aguaceros y tronadas aumentara a traves del area de pronostico durante el fin de semana y hasta la proxima semana laboral. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar corrientes marinas al Servicio Nacional de Meteorologia en San Juan.
The San Juan radar (TJUA), 54 km away, was scanning. The volume nearest the first event began at 13:57 UTC.
1 funnel cloud. Local standard time, as filed.
Skywarn observer reported a funnel cloud at around 200 feet from the Fajardo coast.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2018Every state in 2018This day in weather historyWarnings in Puerto Rico, August 2018
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: 783418.