Abundant moisture and instability was in place across south Florida with a severe thunderstorm developing over southeast Palm Beach County during the late afternoon.
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 MFL wrote it up.
Abundant moisture and instability was in place across south Florida with a severe thunderstorm developing over southeast Palm Beach County during the late 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 Miami, FL wrote its last area forecast discussion before the first event at Sep 7, 1:37 PM EST, 1 hour 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 237 PM EDT WED SEP 7 2011 ...CONTINUE THE WET PATTERN REST OF THIS WEEK OVER SOUTH FLORIDA... ...SOUTH FLORIDA NEEDS TO MONITOR TROPICAL STORM MARIA THROUGH THE WEEKEND... .DISCUSSION... THE STATIONARY FRONT WAS LOCATED ALONG THE I-4 CORRIDOR EARLY THIS AFTERNOON...AS A SHORT WAVE WAS MOVING INTO SOUTHWEST CENTRAL FLORIDA. THE FRONT WILL REMAIN NEARLY STATIONARY THIS AFTERNOON INTO THIS EVENING...AS THE SHORT WAVE MOVES ACROSS CENTRAL FLORIDA. THIS WILL KEEP THE STEERING FLOW IN A SOUTHWEST DIRECTION AND ALLOW FOR CONTINUATION OF THE SHOWER AND THUNDERSTORM DEVELOPMENT OVER THE CWA WITH THE HIGHEST COVERAGE OVER THE LAKE OKEECHOBEE AND PALM BEACH COUNTY AREAS. SO HAVE INCREASE THE POPS UP A LITTLE BIT OVER THE CWA FOR REST OF THIS AFTERNOON INTO THE EVENING HOURS FROM AROUND 30 TO 40 PERCENT OVER THE SOUTHERN AREAS TO 50 TO 60 PERCENT OVER THE LAKE OKEECHOBEE REGION. THE SHOWERS AND THUNDERSTORMS SHOULD SLOWLY DISSIPATE THIS EVENING..AS THE HEATING OF THE DAY IS LOST OVER SOUTH FLORIDA. HOWEVER...WITH THE FRONT STILL NEAR BY THERE COULD STILL BE SOME SHOWERS AND THUNDERSTORMS OVER THE GULF WATERS AND THE WEST COAST METRO AREAS TONIGHT. THEREFORE...PLAN ON KEEPING ISOLATED TO SCATTERED POPS OVER THE CWA THIS EVENING BEFORE GOING DRY EXCEPT FOR ISOLATED POPS AFTER MIDNIGHT WEST COAST METRO AREAS. ON THURSDAY...THE STATIONARY FRONT WILL DRIFT A LITTLE BIT SOUTH INTO SOUTH CENTRAL FLORIDA...AS ANOTHER SHORT WAVE OVER THE SOUTH CENTRAL GULF MOVES NORTHEAST AND THROUGH THE SOUTH CENTRAL FLORIDA OR LAKE OKEECHOBEE AREA. THIS WILL KEEP THE STEERING FLOW IN A SOUTH TO SOUTHWEST DIRECTION AND CONTINUE THE SCATTERED POPS OVER THE CWA...EXCEPT NUMEROUS POPS OVER THE LAKE OKEECHOBEE REGION. THE BEST CHANCE WILL BE IN THE AFTERNOON HOURS ON THURSDAY. FOR FRIDAY...THE FRONT WILL MOVE BACK NORTH INTO CENTRAL FLORIDA...AS HIGH PRESSURE STARTS TO BUILD BACK INTO THE AREA FROM THE WESTERN ATLANTIC WATERS. THIS WILL ALLOW FOR MORE OF A SOUTHERLY WIND FLOW ON FRIDAY AND ALLOW FOR BOTH SEA BREEZES TO DEVELOP AND PUSH SLOWLY INLAND. THIS WILL FOCUS THE HIGHS POPS OVER THE INTERIOR AND LAKE OKEECHOBEE AREA ON FRIDAY. THERE COULD ALSO BE SOME PATCHY FOG OVER THE INTERIOR AREAS LATE TONIGHT AND AGAIN LATE THURSDAY NIGHT...DUE TO THE LIGHT WINDS AND THE TROPICAL MOISTURE IN PLACE. SO WILL ADD PATCHY FOG OVER THE INTERIOR AREAS FOR LATE TONIGHT AND AGAIN LATE THURSDAY NIGHT. .EXTENDED FORECAST... THE FRONT WILL WASH OUT OVER CENTRAL FLORIDA ON SATURDAY ALLOWING FOR THE RIDGE OF HIGH PRESSURE TO BUILD AND MOVE NORTH INTO CENTRAL FLORIDA OVER THE WEEKEND. THIS WILL ALLOW FOR THE STEERING FLOW TO BECOME EASTERLY OVER THE CWA THIS WEEKEND. AT THE SAME TIME...A TROPICAL WAVE NEAR THE LEEWARD ISLANDS WILL ALSO CONTINUE TO MOVE THE WEST NORTHWEST AND THROUGH THE CARIBBEAN SEAS THIS WEEKEND. THE NORTHERN PORTION OF THE WAVE COULD MOVE THROUGH SOUTH FLORIDA ON SUNDAY INCREASING THE CHANCE OF SHOWERS AND THUNDERSTORMS TO THE AREA. HOWEVER...THE POPS WILL REMAIN IN THE CHANCE CAT FOR ALL OF SOUTH FLORIDA THIS WEEKEND WITH THE HIGHEST POPS OVER THE WESTERN PORTION OF SOUTH FLORIDA EACH DAY. TROPICAL STORM MARIA IS FORECAST BY THE NATIONAL HURRICANE CENTER TO MOVE TO THE WEST NORTHWEST LATE THIS WEEK AND BE NEAR THE SOUTHERN BAHAMA ISLANDS BY MONDAY MORNING. THE LONG RANGE MODELS ARE ALSO SHOWING MARIA TO MOVE NORTHWEST NEAR THE BAHAMA ISLANDS EARLY TO MIDDLE OF NEXT WEEK. HOWEVER...THE ERROR ON THE POSITION OF TROPICAL SYSTEMS THIS FAR OUT IS MORE THAN 300 MILES. FLORIDA RESIDENTS AND VISITORS NEED TO CONTINUE TO MONITOR THE LATEST FORECAST FROM THE NATIONAL HURRICANE CENTER ON TROPICAL STORM MARIA THROUGH THE WEEKEND AND INTO EARLY NEXT WEEK. && .MARINE... THE WINDS WILL BE SOUTH TO SOUTHWEST AT LESS THAN 10 KNOTS OVER ALL OF SOUTH FLORIDA WATERS TONIGHT THROUGH FRIDAY...BEFORE BACKING BACK TO A SOUTHEAST TO EAST DIRECTION AND INCREASING 10 TO 15 KNOTS BY LATE THIS WEEKEND. THERE WILL ALSO BE A NORTHEAST SWELLS OF 1 TO 2 FEET IN THE ATLANTIC WATERS WITH 2 TO 3 FEET OVER THE PALM BEACH WATERS TONIGHT INTO THURSDAY DUE TO HURRICANE KATIA MOVING NORTH IN THE WESTERN ATLANTIC WATERS. DUE TO THE LIGHT WIND FLOW...THE SEAS WILL REMAIN BELOW 6 FEET IN THE ATLANTIC WATERS. THE GULF WATERS WILL ALSO REMAIN BELOW 3 FEET THROUGH THE WEEKEND. BOATING CONDITIONS WILL BE GOOD OVER SOUTH FLORIDA WATERS OUTSIDE OF ANY SHOWERS OR THUNDERSTORMS THROUGH THE WEEKEND. && .FIRE WEATHER... THE RELATIVE HUMIDITIES WILL REMAIN WELL ABOVE THE 35 PERCENT CRITICAL VALUE THROUGH THE WEEKEND. THEREFORE...NO PROBLEMS WITH THE WEATHER WEATHER OVER SOUTH FLORIDA. && .PRELIMINARY POINT TEMPS/POPS... WEST PALM BEACH 73 91 75 90 / 30 50 30 40 FORT LAUDERDALE 77 91 79 90 / 20 40 20 30 MIAMI 76 92 78 91 / 20 30 20 30 NAPLES 75 90 75 90 / 30 50 30 40 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. && DISCUSSION/MARINE...54/BNB AVIATION/RADAR/FIRE...14/MJB
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA NATIONAL WEATHER SERVICE MIAMI FL 942 AM EDT WED SEP 7 2011 FLZ063-066>075-168-172>174-080930- GLADES-HENDRY-INLAND PALM BEACH-METRO PALM BEACH-COASTAL COLLIER- INLAND COLLIER-INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE- METRO MIAMI DADE-MAINLAND MONROE-COASTAL PALM BEACH- COASTAL BROWARD-COASTAL MIAMI DADE-FAR SOUTH MIAMI DADE- 942 AM EDT WED SEP 7 2011 ...SCATTERED THUNDERSTORMS, SOME WITH STRONG GUSTY WINDS... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...TODAY AND TONIGHT RIP CURRENTS: A LIGHT SOUTHWESTERLY FLOW WILL RESULT IN A SLIGHT RISK OF RIP CURRENTS ALONG THE GULF COAST BEACHES OF COLLIER COUNTY TODAY. A SMALL NORTHEAST SWELL WILL CONTINUE TO BUILD INTO THE ATLANTIC WATERS TO THE EAST OF PALM BEACH COUNTY TODAY, RESULTING IN A SLIGHT RISK OF RIP CURRENTS FOR THE ATLANTIC COAST BEACHES OF PALM BEACH COUNTY. THUNDERSTORMS: ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EARLY EVENING. THE PRIMARY THREATS WILL BE LIGHTNING STRIKES, GUSTY WINDS, AND LOCALLY HEAVY RAINFALL. WATERSPOUTS: THE COMBINATION OF LIGHT SOUTHWESTERLY WINDS AND THE PRESENCE OF LOW LEVEL CLOUD CONVERGENCE BANDS WILL RESULT IN A SLIGHT RISK OF WATERSPOUTS ACROSS THE LOCAL GULF WATERS. WIND: A FEW THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING MAY CONTAIN GUSTY WINDS OF 40 TO 50 MPH. TEMPERATURES: MAXIMUM HEAT INDEX VALUES WILL RANGE FROM 100 TO 104 DEGREES IN PORTIONS OF SOUTH FLORIDA THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE PERIOD, WITH THE BEST CHANCE DURING AFTERNOON AND EVENING HOURS. THE PRIMARY IMPACTS WILL BE LIGHTNING STRIKES, GUSTY WINDS, AND LOCALLY HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT THUNDERSTORMS WITH STRONG WINDS TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI. FOR MORE INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN MIAMI WEBSITE AT WWW.WEATHER.GOV/MIAMI.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 233 PM EDT WED SEP 7 2011 FLZ073-074-071915- INLAND MIAMI-DADE COUNTY FL METROPOLITAN MIAMI DADE FL 233 PM EDT WED SEP 7 2011 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SIGNIFICANT WEATHER ADVISORY FOR... NORTH CENTRAL MIAMI-DADE COUNTY * UNTIL 315 PM EDT * AT 230 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR KENDALE LAKES...AND MOVING NORTH AT 15 MPH. * THE STORM WILL AFFECT... SWEETWATER... MICCOSUKEE RESORT... DORAL... MEDLEY... AND SURROUNDING COMMUNITIES. THE PRIMARY IMPACTS WILL BE FREQUENT LIGHTNING AND GUSTY WINDS TO 45 MPH. LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. THESE WINDS CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM PASSES. LAT...LON 2592 8058 2595 8033 2571 8034 2570 8047 TIME...MOT...LOC 1833Z 170DEG 12KT 2575 8042 MJB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 246 PM EDT WED SEP 7 2011 FLZ066-067-070-071-071930- HENDRY FL INLAND BROWARD COUNTY FL INLAND COLLIER COUNTY FL INLAND PALM BEACH COUNTY FL 246 PM EDT WED SEP 7 2011 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SIGNIFICANT WEATHER ADVISORY FOR... NORTHWESTERN BROWARD COUNTY EXTREME SOUTHWESTERN PALM BEACH COUNTY SOUTHEASTERN HENDRY COUNTY EAST CENTRAL COLLIER COUNTY * UNTIL 330 PM EDT * AT 243 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR MILE MARKER 60 ON ALLIGATOR ALLEY...AND MOVING NORTH AT 15 MPH. * THE STORM WILL AFFECT... BIG CYPRESS SEMINOLE INDIAN RESERVATION... AND SURROUNDING COMMUNITIES. THE PRIMARY IMPACTS WILL BE FREQUENT TO EXCESSIVE LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH. LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. THESE WINDS CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM PASSES. LAT...LON 2645 8103 2632 8075 2609 8097 2613 8108 TIME...MOT...LOC 1846Z 194DEG 14KT 2620 8100 MJB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 326 PM EDT WED SEP 7 2011 FLZ071-072-072000- INLAND BROWARD COUNTY FL METRO BROWARD COUNTY FL 326 PM EDT WED SEP 7 2011 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SIGNIFICANT WEATHER ADVISORY FOR... EASTERN BROWARD COUNTY * UNTIL 400 PM EDT * AT 321 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR WESTON...AND MOVING NORTHEAST AT 15 MPH. * THE STORM WILL AFFECT... WESTON... COOPER CITY... NOVA SOUTHEASTERN UNIVERSITY... SAWGRASS MILLS MALL... PLANTATION... SUNRISE... AND SURROUNDING COMMUNITIES. THE PRIMARY IMPACTS WILL BE FREQUENT TO EXCESSIVE LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH. LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. THESE WINDS CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM PASSES. THERE COULD ALSO BE SOME MINOR STREET FLOODING AS THIS STORM IS CAPABLE OF PRODUCING ONE TO TWO INCHES OF RAINFALL IN A SHORT AMOUNT OF TIME. LAT...LON 2628 8028 2607 8018 2598 8045 2615 8053 TIME...MOT...LOC 1925Z 216DEG 11KT 2612 8039 KOB
The Miami radar (KAMX), 87 km away, was scanning. The volume nearest the first event began at 19:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
A trained spotter estimated a wind gust of 60 mph at the intersection of Lyons Road and Glades Road. The wind blew over a gas grill and an outdoor reptile tank.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2011Every state in 2011This day in weather historyWarnings in Florida, September 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: 348149.