A strong thunderstorm developed as an outflow boundary from earlier thunderstorms collided with a remnant cumulus line over Big Pine Key. Gale force winds resulted in minor damage to trees.
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The episode as NWS KEY wrote it up.
A strong thunderstorm developed as an outflow boundary from earlier thunderstorms collided with a remnant cumulus line over Big Pine Key. Gale force winds resulted in minor damage to trees.
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 Key West, FL wrote its last area forecast discussion before the first event at Jun 11, 8:20 PM EST, 40 minutes earlier.
AREA FORECAST DISCUSSION FOR THE FLORIDA KEYS NATIONAL WEATHER SERVICE KEY WEST FL 920 PM EDT THU JUN 11 2009 .DISCUSSION... .CURRENTLY... KBYX DETECTS A LARGE CLUSTER OF SHOWERS AND THUNDERSTORMS OVER THE LOWER AND MIDDLE KEYS...AS WELL AS OVER THE NEARSHORE WATERS SOUTH OF THE LOWER AND MIDDLE KEYS. ELSEWHERE...KBYX DETECTS NO PRECIPITATION ECHOES IN THE REMAINDER OF THE FORECAST AREA. SKIES OVER THE ISLAND CHAIN ARE PARTLY TO MOSTLY CLOUDY. WINDS OVER LAND ARE NORTH NEAR 5 MPH. C-MAN WINDS...ON AVERAGE...ARE VARIABLE NEAR 5 KNOTS. TEMPERATURES ARE IN THE LOWER 80S. ONLY ABOUT FOUR DEGREES OF COOLING IS EXPECTED TONIGHT DUE TO LIGHT SURFACE WINDS OVER WATER WITH TEMPERATURES IN THE MID TO UPPER 80S. .SHORT TERM (OVERNIGHT)... IN THE LOW LEVELS OF THE ATMOSPHERE...A WEAK ATLANTIC RIDGE OF HIGH PRESSURE WILL EXTEND ACROSS SOUTH FLORIDA TONIGHT. IN THE MID LEVELS OF THE ATMOSPHERE...A FEEBLE AREA OF HIGH PRESSURE WILL BE CENTERED OVER THE NORTHWEST GULF OF MEXICO OVERNIGHT. IN THE UPPER LEVELS OF THE ATMOSPHERE...A RIDGE OF HIGH PRESSURE WILL BUILD EASTWARD ACROSS THE GULF OF MEXICO TONIGHT. FARTHER EAST...IN THE UPPER LEVELS OF THE ATMOSPHERE...AN AREA OF LOW PRESSURE WILL BE CENTERED OVER THE BAHAMAS OVERNIGHT. THE 00Z KKEY SOUNDING IS MODERATELY UNSTABLE... BUT DRY FOR THIS TIME OF YEAR...WITH A PRECIPITABLE WATER (PWAT) VALUE JUST ABOVE ONE AND ONE HALF OF AN INCH. ATMOSPHERIC MOISTURE SHOULD DECREASE OVERNIGHT. BY SUNRISE FRIDAY...PWAT VALUES SHOULD BE JUST BELOW ONE AND ONE HALF OF AN INCH...WHICH IS NEAR THE 25TH PERCENTILE FOR EARLY TO MID JUNE. CONVECTION...WHICH DEVELOPED OVER SOUTH FLORIDA...MADE IT FARTHER SOUTHWARD THIS EVENING WHEN COMPARED TO YESTERDAY EVENING. THESE SHOWERS AND STORMS SHOULD MOVE SOUTH OF THE LOWER AND MIDDLE KEYS BY MIDNIGHT AT THE LATEST. AFTER MIDNIGHT...THE RELATIVELY DRY AIR MASS IN PLACE WILL LIMIT POPS TO SLIGHT CHANCE CATEGORY OVERNIGHT. THE CURRENT ZONE FORECASTS WILL NEED TO BE UPDATED TO REMOVE TRANSITIONAL WORDING WHEN THE TIME COMES. && .MARINE... LIGHT AND VARIABLE SURFACE WINDS WILL PREVAIL ON ALL KEYS WATERS OVERNIGHT. NO ADVISORIES OR CAUTIONARY STATEMENTS EXPECTED TONIGHT THROUGH AT LEAST TUESDAY. && .AVIATION... OVERNIGHT...VFR CONDITIONS WILL PREDOMINATE AT THE KEY WEST AND MARATHON ISLAND TERMINALS. LOWER LEVEL BOUNDARIES WILL LINGER IN THE VICINITY OF THE ISLAND TERMINALS THROUGH THE OVERNIGHT HOURS...WITH THE POSSIBILITY OF BOUNDARY COLLISIONS LAUNCHING BRIEF SHOWERS OR THUNDERSTORMS. BRIEF MVFR/IFR CIGS AND/OR VIS WILL BE LIKELY WITHIN ANY OF THESE SHOWERS OR THUNDERSTORMS. OUTSIDE OF ANY CONVECTIVE ACTIVITY...WINDS WILL REMAIN LIGHT AND VARIABLE. && .CLIMATE... ON THIS DATE IN KEYS WEATHER HISTORY...IN 1985...THE LOW TEMPERATURE IN KEY WEST WAS ONLY 86 DEGREES. THIS SET THE DAILY RECORD FOR WARMEST LOW TEMPERATURE MEASURED IN KEY WEST ON JUNE 11TH. IN ADDITION...THIS LOW TEMPERATURE OF 86 DEGREES IS TIED AS THE WARMEST LOW TEMPERATURE EVER RECORDED IN THE HISTORY OF KEY WEST. && .KEY WATCHES/WARNINGS/ADVISORIES... FL...NONE. GM...NONE. && PUBLIC/MARINE/FIRE/CLIMATE/DIGITAL...BS AVIATION/NOWCASTS....................FUTTERMAN DATA ACQUISITION.....................WAH VISIT US ON THE WEB AT WWW.WEATHER.GOV/KEYWEST
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE KEY WEST FL 507 AM EDT THU JUN 11 2009 CORRECTED TO INCLUDE TODAY FOR DAY ONE FLZ076>078-GMZ031>033-052>054-072>075-120915- MONROE UPPER KEYS-MONROE MIDDLE KEYS-MONROE LOWER KEYS- FLORIDA BAY-GULF SIDE OF THE LOWER KEYS OUT 20 NM- GULF WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE 20 TO 60 NM OUT- OCEAN REEF TO CRAIG KEY OUT 20 NM- CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE OUT 20 NM- WEST END OF THE 7 MILE BRIDGE TO KEY WEST OUT 20 NM- OCEAN REEF TO CRAIG KEY 20 TO 60 NM OUT- CRAIG KEY TO THE WEST END OF THE 7 MILE BRIDGE 20 TO 60 NM OUT- WEST END OF THE 7 MILE BRIDGE TO KEY WEST 20 TO 60 NM OUT- KEY WEST TO 20 NM WEST OF DRY TORTUGAS OUT 60 NM- 507 AM EDT THU JUN 11 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE FLORIDA KEYS AND ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT ISOLATED SHOWERS A WITH A FEW EMBEDDED THUNDERSTORMS ARE POSSIBLE THROUGH TONIGHT. THE PRIMARY HAZARD WILL BE LIGHTNING STRIKES FROM THUNDERSTORMS THAT MAY FORM. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL BE POSSIBLE THROUGH THE PERIOD. THE MAIN RISK WILL BE CLOUD TO SURFACE LIGHTNING AND POSSIBLE GUSTY WINDS IN NEAR STORM ENVIRONMENTS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KEY WEST FL
736 PM EDT THU JUN 11 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0713 PM WATER SPOUT 2 N PIDGEON KEY 24.74N 81.16W
06/11/2009 GMZ031 FL TRAINED SPOTTER
A TRAINED SPOTTER REPORTED A WATERSPOUT JUST TO THE NORTH
OF THE SEVEN MILE BRIDGE NEAR PIDGEON KEY. THE WATERSPOUT
WAS OBSERVED ALL THE WAY TO THE WATER.
&&
WHOVORKAThe Key West radar (KBYX), 35 km away, was scanning. The volume nearest the first event began at 02:01 UTC.
1 thunderstorm wind. Local standard time, as filed.
Two dead pine trees were blown down, one across Palm Beach Road in central Big Pine Key. A six-inch diameter tree limb from a healthy buttonwood tree was also blown down. A nearby residence and CWOP automated station measured a wind gust out of the north-northwest at 51 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2009Every state in 2009This day in weather historyWarnings in Florida, June 2009
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: 184759.