A tropical wave that moved across the Caribbean Waters brought near severe weather to Saint Croix. Strong thunderstorms with very gusty winds were observed with wind gusts of 47 mph in Saint Croix during the early afternoon.
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The episode as NWS SJU wrote it up.
A tropical wave that moved across the Caribbean Waters brought near severe weather to Saint Croix. Strong thunderstorms with very gusty winds were observed with wind gusts of 47 mph in Saint Croix during the early afternoon.
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 16, 11:02 AM AST, 1 hour 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1102 AM AST TUE AUG 16 2011 .UPDATE...NO CHANGES TO SHORT TERM ANALYSIS AS SHOWERS CONTINUE TO RAPIDLY MOVE ACROSS THE AREA. MOST OF THE ACTIVITY REMAINS OVER CARIBBEAN WATERS OF PUERTO RICO...SAINT CROIX SOUTH...WHERE THE CONVECTIVE ACTIVITY REMAINS SIGNIFICANT AS THE TROPICAL WAVE PUSHES WESTWARD. STILL EXPECTING SOME SQUALLY WEATHER ACROSS THE REGION THIS AFTERNOON AS SHOWERS AND THUNDERSTORMS WITH GUSTY WINDS EXPECTED. && .AVIATION...NO CHANGES TO PREVIOUS PACKAGE...FOR THIS AFTERNOON TEMPO MVFR CONDITIONS CAN BE EXPECTED ACROSS TJSJ...TJPS...TJMZ...AND TJBQ IN SHRA/TSRA. WINDS WILL BE MAINLY EAST AT 15 TO 20 KTS WITH HIGHER GUSTS IN SHRA/TSRA. && .PREV DISCUSSION... /ISSUED 502 AM AST TUE AUG 16 2011/ SYNOPSIS...SUBTROPICAL RIDGE WILL REMAIN THE DOMINANT WEATHER FEATURE AT MID AND UPPER LEVELS. TROPICAL WAVE NOW ACROSS THE EASTERN CARIBBEAN SEA WILL MOVE WEST OVER THE NEXT 24 HRS AND BRING SQUALLY WEATHER THIS AFTERNOON AND EVENING. DISCUSSION...BANDS OF SHOWERS AND THUNDERSTORMS ASSOCIATED TO A STRONG TROPICAL WAVE...NOW LOCATED OVER THE EASTERN CARIBBEAN... HAVE AFFECTED THE EASTERN WATERS AND EASTERN PORTIONS OF PUERTO RICO INCLUDING THE SAN JUAN METROPOLITAN AREA DURING THE OVERNIGHT HOURS. THE AVERAGE SPEED OF THESE SHOWERS AND THUNDERSTORMS IS 25 KNOTS. ALTHOUGH SOME OF THESE SHOWERS HAVE PRODUCE HEAVY DOWNPOURS ..DUE TO THE FAST STORM MOTION...RAINFALL ACCUMULATIONS HAVE BEEN LOW. THE FLOODING POTENTIAL WILL BE HIGHER AS RAIN BANDS BECOME MORE FREQUENT THROUGH TONIGHT. THE MAIN CONCERN WILL THE STRONG GUSTY WINDS ASSOCIATED TO THE SHOWERS AND THUNDERS TOMS. SHOWER AND THUNDERSTORM ACTIVITY ASSOCIATED TO THE TROPICAL WAVE DECREASED CONSIDERABLY AT AROUND MIDNIGHT...BUT NEW SHOWERS AND THUNDERSTORMS HAVE APPEARED AS THE CENTER OF THE SYSTEM MOVES CLOSER TO THE CENTER OF THE CARIBBEAN BASIN. THE NHC GIVE THIS WAVE A LOW CHANCE...20 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS. AVIATION...BRIEF PERIODS OF MVFR CONDITIONS CAN BE EXPECTED ACROSS TKPK...TNCM...TIST...TISX AND TJSJ DURING THE MORNING HOURS IN PASSING SHRA. FOR THIS AFTERNOON TEMPO MVFR CONDITIONS CAN BE EXPECTED ACROSS TJSJ...TJPS...TJMZ...AND TJBQ IN SHRA/TSRA. WINDS WILL BE MAINLY EAST AT 15 TO 20 KTS WITH HIGHER GUSTS IN SHRA/TSRA. MARINE...MARINE CONDITIONS WILL QUICKLY DETERIORATE AS A STRONG TROPICAL WAVE MOVES ACROSS THE CARIBBEAN WATERS. THIS WAVE WILL GENERATE SQUALLY WEATHER CONDITIONS AS RAIN BANDS WILL CONTINUE TO AFFECT THE LOCAL WATERS...MAINLY THE CARIBBEAN WATERS. A WIND SURGE BEHIND THIS TROPICAL WAVE WILL RESULT IN A FURTHER INCREASE IN WINDS AND SEAS ACROSS THE COASTAL WATERS FROM LATE THIS AFTERNOON THROUGH WEDNESDAY MORNING. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 79 89 79 / 50 50 30 40 STT 90 80 91 81 / 60 50 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 15/25
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 610 AM AST TUE AUG 16 2011 AMZ710>745-PRZ001>013-171015- 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 TUE AUG 16 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT ACTIVE TROPICAL WAVE WILL CONTINUE TO MOVE SOUTH OF PUERTO RICO TODAY. LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ANY INFORMATION ABOUT FLOODING OR WIND REPORT WILL BE APPRECIATED. AMZ715-725-VIZ001-002-171015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 610 AM AST TUE AUG 16 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT ACTIVE TROPICAL WAVE WILL CONTINUE TO MOVE SOUTH OF THE ISLANDS TODAY. LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ANY INFORMATION ABOUT FLOODING OR WIND REPORT WILL BE APPRECIATED.
The San Juan radar (TJUA), 144 km away, was scanning. The volume nearest the first event began at 16:53 UTC.
1 thunderstorm wind. Local standard time, as filed.
A strong wind gust downed a tree that fell on a power line in the Estate Glynn area causing some power outages.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in U.S. Virgin Islands in 2011Every state in 2011This day in weather historyWarnings in U.S. Virgin Islands, August 2011
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: 341562.