Trough aloft continued to move away the area while resulting in showers and thunderstorms affecting local area.
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.
Trough aloft continued to move away the area while resulting in showers and thunderstorms affecting local area.
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 May 11, 3:55 PM AST, 55 minutes earlier.
Area Forecast Discussion
National Weather Service San Juan PR
355 PM AST Thu May 11 2017
.SYNOPSIS...Trough aloft will continue to move away while
weakening. As a result, weather conditions are expected to slowly
improve Friday and into the upcoming weekend. However, locally
induced showers and thunderstorms are still expected each day.
&&
.SHORT TERM...Tonight thru Sat...
Weather conditions are expected to slowly improve across the
forecast area as the broad mid to upper level trough across the
forecast area shifts eastward while weakening. As this feature
moves away tonight and Friday, a mid level ridge will spread
across the local islands to result in a more seasonable weather
pattern. The ridge aloft is then expected to hold across the
forecast area through at least early next week. Under the
influence of the ridge aloft, low level moisture is expected
to erode.
Therefore...A generally fair weather pattern is expected to
prevail during the morning hours across the local islands with
showers and thunderstorms developing each afternoon across
central Puerto Rico. Soils are already saturated, therefore with
the heaviest showers urban and small stream flooding as well as
mudslides in areas of steep terrain are still possible.
.LONG TERM...Sun thru Thu.../issued 602 AM AST Thu May 11 2017/
A ridge aloft is expected to hold over the region the upcoming
week. However, model guidance quickly bring a tropical wave with
abundant tropical moisture across the region Sunday or Monday.
This scenario can increase the potential for showers and
thunderstorms across the islands. Moisture is forecast to rapidly
decrease by Tuesday into mid week. But, GFS guidance suggest the
formation of a Subtropical Jet by midweek. The combination of
daytime heating, local effects and the available moisture could
produce periods of showers and thunderstorms during the afternoons
and early evening hours along the Cordillera and western sections
of Puerto Rico. Also, the U.S. Virgin Islands, as well as the
windward sections of PR, can expect passing showers mainly during
the overnight and early morning hours each day.
&&
.AVIATION...Tempo MVFR/IFR possible at TJPS/TNCM/TKPK through 22z
due to TSRA. Mountain top obscd along the interior/eastern sections
of PR. Mostly VFR elsewhere with periods of -RA/VCSH across the
USVI terminals. SFC winds light with a northerly component, becoming
light and variable overnight.
&&
.MARINE...Seas 3 to 5 feet and easterly winds 10 to 15 knots will
continue to prevail across the local waters tonight. The near shore
San Juan buoy is still indicating a small 12-13 second swell at
around 3 feet. As a result, breaking waves between 5 and 6 feet
are still expected and therefore the high risk of rip currents
continues through late tonight. Tranquil marine conditions will
continue through early next week with seas below 5 feet and
easterly winds 10-15 knots.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 75 89 76 89 / 40 30 20 20
STT 75 86 75 88 / 40 30 20 20
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk through late tonight for North Central-
Northeast-Northwest-San Juan and Vicinity-Southeast-Western
Interior.
Flash Flood Watch until 6 PM AST this evening for Central
Interior-Eastern Interior-Mayaguez and Vicinity-North
Central-Northeast-Northwest-Ponce and Vicinity-San Juan and
Vicinity-Southeast-Southwest-Western Interior.
VI...None.
AM...Flash Flood Watch until 6 PM AST this evening for Coastal Waters
OF Southwestern Puerto Rico out 10 NM-Coastal Waters of
Southern Puerto Rico out 10 NM.
&&
SHORT TERM...OM
AVIATION...DSHazardous Weather Outlook...CORRECTED National Weather Service San Juan PR 1126 AM AST Thu May 11 2017 AMZ710>745-PRZ001>013-121000- San Juan and Vicinity-Northeast-Southeast-Eastern Interior- North Central-Central Interior-Ponce and Vicinity-Nortwest- Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques- The nearshore and off shore Atlantic and Caribbean Coastal Waters- 1126 AM AST Thu May 11 2017 This Hazardous Weather Outlook is for Puerto Rico and the adjacent Atlantic Coastal Waters. .Day One...Today and Tonight .Thunderstorms...There is a strong chance of thunderstorms with heavy rainfall and brief gusty winds this afternoon across portions of southwestern and interior Puerto Rico. Intense thunderstorms over these areas could produce small hail and strong gusty winds. .Flooding...Heavy rains in localized areas will produce flooding of some rivers, small streams and urban areas and could also trigger further mudslides. .Rip Currents...There is a high risk of rip currents for the north coast of Puerto Rico and moderate risk on the northeast and northwest coasts. .Winds...A small area of winds exceeding 17 knots is expected over the local outer Caribbean waters south of southeast Puerto Rico. .Days Two through Seven...Friday through Wednesday Showers and thunderstorms will diminish Friday and Saturday but there will still be some risk of urban and small stream flooding. Rainfall will increase Sunday and Monday with a return of the possibility of flooding and mudslides. The high risk of rip currents will diminish Friday night but return on Wednesday. .Spotter information statement... Spotters are encouraged to report flooding, waterspouts and rip currents to the National Weather Service in San Juan. AMZ715-725-VIZ001-002-121000- St. Thomas St. John adjacent Islands-St Croix- Nearshore Atlantic and adjacent Caribbean Coastal Waters- 1126 AM AST Thu May 11 2017 This Hazardous Weather Outlook is for the U.S. Virgin Islands and the ADJACENT Coastal Waters. .Day One...Today and Tonight .Thunderstorms...There is a chance of thunderstorms with frequent lightning, heavy rainfall and brief gusty winds across portions of the Atlantic and Caribbean waters around the U.S. Virgin Islands. .Flooding...Heavy rains can lead to urban and small stream flooding. .Rip Currents...There is a moderate risk of rip currents for for the northern coasts of Saint Thomas and the northern and southeastern coasts of Saint Croix. .Days Two through Seven...Friday through Wednesday Showers and thunderstorms will diminish Friday and Saturday. Rainfall will increase Sunday and Monday with a return of the possibility of flooding. The moderate risk of rip currents will not completely disappear during the period but a high risk of rip currents is expected on Wednesday. .Spotter information statement... Spotters are encouraged to report flooding, waterspouts and rip currents to the National Weather Service in San Juan.
Special Weather Statement National Weather Service San Juan PR 142 PM AST THU MAY 11 2017 PRZ007-009-010-111845- Mayaguez and Vicinity-Western Interior-Ponce and Vicinity- 142 PM AST THU MAY 11 2017 ...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SABANA GRANDE... GUAYANILLA...MARICAO...PONCE...SOUTHEASTERN SAN GERMAN...ADJUNTAS... YAUCO AND PENUELAS MUNICIPALITIES... At 141 PM AST, strong thunderstorms were clustered near Yauco, moving east at 10 mph. Winds in excess of 30 mph and pea size hail are possible with this storm. Locations impacted include... Yauco, Sabana Grande, Penuelas, San German and Tallaboa Alta. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 1808 6708 1817 6703 1816 6669 1803 6670 TIME...MOT...LOC 1741Z 269DEG 18KT 1810 6683 DS
Comunicado Especial sobre las Condiciones del Tiempo Servicio Nacional de Meteorologia San Juan PR 142 PM AST jueves 11 de mayo de 2017 PRZ007-009-010-111845- Interior Central-Ponce y Vecindad- 142 PM AST jueves 11 de mayo de 2017 ...Una area de fuertes tronadas afectaran Sabana Grande...Guayanilla...Maricao...Ponce...sureste de San German...Adjuntas...Yauco y Penuelas... A las 141 PM AST, fuertes tronadas estuvieron agrupados sobre Yauco, moviendose hacia el este a 10 mph. Vientos en exceso de 30 mph y granizo de tamano de guisante son posibles con esta actividad. Localidades impactadas incluyen...Yauco, Sabana Grande, Penuelas, San German y Tallaboa Alta. Lluvias torrenciales tambien esta ocurriendo con esta tormenta, y podrian causar inundaciones localizadas. No maneje su vehiculo por carreteras inundadas. Rayos frecuentes de nube a suelo estan ocurriendo con esta tormenta. Impactos de rayos pueden ocurrir a 10 millas de la tronada. Busque refugio seguro dentro de un edificio o vehiculo. DS/GL
Special Weather Statement National Weather Service San Juan PR 258 PM AST THU MAY 11 2017 PRZ006-007-111945- Central Interior-Ponce and Vicinity- 258 PM AST THU MAY 11 2017 ...A STRONG THUNDERSTORM WILL AFFECT VILLALBA...COAMO...PONCE AND JUANA DIAZ MUNICIPALITIES... At 256 PM AST, a strong thunderstorm was located over Ponce, Villalba, Juana Diaz and Coamo. the storm is nearly stationary. Winds in excess of 30 mph and pea size hail are possible with this storm. Locations impacted include... Ponce, Villalba, Juana Diaz, Luis Llorens Torres, Guayabal, Aguilita and Coto Laurel. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 1815 6637 1809 6637 1798 6666 1812 6664 TIME...MOT...LOC 1856Z 000DEG 0KT 1805 6658 JJA
Comunicado Especial sobre las Condiciones del Tiempo Servicio Nacional de Meteorologia San Juan PR 258 PM AST jueves 11 de mayo de 2017 PRZ006-007-111945- Interior Central-Ponce y Vecindad- 258 PM AST jueves 11 de mayo de 2017 ...Una tronada fuerte afectara Villalba, Coamo, Ponce y Juana Diaz... A las 2:56 PM AST,una tronada fuerte estaba localizada sobre Ponce, Villalba, Juana Diaz y Coamo. La tronada estaba casi estacionaria. Vientos en exceso de 30 mph y granizo de tamano de guisante son posibles con esta actividad. Localidades impactadas incluyen...Ponce, Villalba, Juana Diaz, Luis Llorens Torres, Guayabal, Aguilita y Coto Laurel. Lluvias torrenciales tambien estan ocurriendo con esta tormenta, y podrian causar inundaciones localizadas. No maneje su vehiculo por carreteras inundadas. Rayos frecuentes de nube a suelo estan ocurriendo con esta tormenta. Impactos de rayos pueden ocurrir a 10 millas de la tronada. Busque refugio seguro dentro de un edificio o vehiculo. JJA/RVT
The San Juan radar (TJUA), 13 km away, was scanning. The volume nearest the first event began at 20:49 UTC.
2 flash flood. Local standard time, as filed.
Emergency managers reported Rio Loiza out of its banks in San Lorenzo. Road PR-181, km 9 is impassable.
Emergency managers reported Rio Manuabo out of its banks with flood waters along Sector Garona in Barrio Tumbao.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2017Every state in 2017This day in weather historyWarnings in Puerto Rico, May 2017
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: 698056, 699780.