An upper level low pressure area moved across South Florida causing instability and combined with abundant tropical moisture to produce strong to severe thunderstorms.
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.
An upper level low pressure area moved across South Florida causing instability and combined with abundant tropical moisture to produce strong to severe thunderstorms.
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 6, 1:33 PM EST, 2 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 233 PM EDT THU SEP 6 2012 .SHORT TERM...TONIGHT THROUGH SATURDAY...THE UPPER LOW THAT HAS BEEN PARKED ACROSS THE NRN BAHAMAS WILL FINALLY START TO MOVE NORTHEAST AND GRADUALLY FILL. THIS WILL ALLOW SLIGHTLY DRIER AIR TO MOVE INTO THE REGION AND THEREFORE A SLIGHT DECREASE IN THE CHANCES FOR RAIN. MOST OF THE PRECIPITATION ACTIVITY DURING THIS PERIOD WILL BE DUE TO A COMBINATION OF LOCAL FACTORS SUCH AS DIURNAL HEATING AND SEA BREEZES. AN UPPER LEVEL RIDGE OVER THE GULF OF MEX WILL ALSO TEND TO INHIBIT WIDESPREAD PRECIP BY WAY OF SUBSIDENCE. TEPERATUREWISE...NO SIGNIFICANT CHANGES ARE EXPECTED, HOWEVER...LOWER HUMIDITY VALUES WILL KEEP HEAT INDICES FROM REACHING THE TRIPLE DIGITS ACROSS MOST OF THE AREA. .LONG TERM...SUNDAY THROUGH THURSDAY...NHC CONTINUES TO MONITOR AN AREA OF LOW PRESSURE OVER THE NORTHERN GULF OF MEX FOR POSSIBLE TROPICAL DEVELOPMENT. THIS SYSTEM IS EXPECTED TO DRIFT SLOWLY FOR THE NEXT COUPLE OF DAY...HOWEVER, LONG RANGE MODELS INDICATE THAT A MID LATITUDE TROUGH SHOULD DIG SOUTHWARD PUSHING A WEAK FRONTAL BOUNDARY INTO THE NRN PORTIONS OF THE GOM AND PUSHING THIS DISTURBANCE NEWD ACROSS NRN PORTIONS OF THE PENINSULA SUNDAY THROUGH MONDAY. BOTH GFS AND ECMWF SHOW THE PARENT TROUGH MOVING RAPIDLY EASTWARD AND LEAVING THE FRONTAL BOUNDARY LYING E-W ACROSS N-CENTRAL PORTIONS OF THE PENINSULA UNTIL ANOTHER ENERGY IMPULSE PUSHES IT TO SOUTH FLORIDA TUESDAY THROUGH WEDNESDAY. THIS MAY RESULT IN INCREASING CHANCES FOR RAIN DURING THIS PERIOD. && .MARINE...A SMALL NORTHEASTERLY SWELL, GENERATED BY LESLIE, WL BEGIN TO REACH THE ATLANTIC WATERS OFF PALM BEACH COUNTY TONIGHT AND GRADUALLY SPREAD SOUTH THROUGH THE WEEKEND. THIS WILL LIKELY LEAD TO AN INCREASED RISK OF RIP CURRENTS ALONG THE ATLANTIC BEACHES THROUGH THIS PERIOD. OTHERWISE...FAIRLY BENIGN MARINE CONDITIONS SHOULD PREVAIL ACROSS ALL LOCAL WATERS AT LEAST THROUGH SUNDAY. && .FIRE WEATHER...NO CONCERNS AT THIS TIME. && .PRELIMINARY POINT TEMPS/POPS... WEST PALM BEACH 74 89 75 90 / 20 30 20 30 FORT LAUDERDALE 76 89 78 90 / 20 20 20 30 MIAMI 76 90 76 90 / 20 20 20 20 NAPLES 74 88 75 90 / 20 30 20 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. && DISCUSSION/MARINE/FIRE...47/RGH AVIATION/RADAR...10/CD
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA NATIONAL WEATHER SERVICE MIAMI FL 337 PM EDT THU SEP 6 2012 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 071045- LAKE OKEECHOBEE-BISCAYNE BAY- COASTAL WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL OUT 20 NM- COASTAL WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL OUT 20 NM- WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL EXTENDING FROM 20 NM TO 60 NM- WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL EXTENDING FROM 20 NM TO THE TERRITORIAL WATERS OF THE BAHAMAS-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- COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL OUT 20 NM- COASTAL WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE, FL OUT 20 NM- GULF WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL EXTENDING FROM 20 TO 60 NM- 337 PM EDT THU SEP 6 2012 ...A FEW STRONG TO SEVERE THUNDERSTORMS POSSIBLE... ...MINOR FLOODING POSSIBLE IN HEAVY SHOWERS... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS: SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH THE EARLY EVENING HOURS ACROSS THE SOUTH FLORIDA PENINSULA. THE MAIN IMPACTS FROM THESE STORMS WILL BE LOCALLY HEAVY RAINFALL...FREQUENT LIGHTNING STRIKES...GUSTY WINDS AND SMALL HAIL. WIND: WIND GUSTS RANGING FROM 45 TO 60 MPH WILL REMAIN POSSIBLE WITH THE STRONGEST STORMS THROUGH THIS EVENING. FLOODING: ADDITIONAL RAINFALL THROUGH THE EARLY EVENING PERIOD COULD LEAD TO MINOR FLOODING CONCERNS...ESPECIALLY OVER THE PALM BEACH COUNTY AND NORTHEAST BROWARD AREAS WHERE LINGERING ISSUES FROM ISAAC CONTINUES. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED AFTERNOON THUNDERSTORMS AFFECTING THE PENINSULA CAN BE EXPECTED. THERE WILL ALSO BE AN INCREASE IN THE RISK OF RIP CURRENTS ALONG THE EAST COAST BEACHES OF SOUTH FLORIDA LATE FRIDAY AND INTO THE WEEKEND AS SWELLS FROM TROPICAL STORM LESLIE MAY AFFECT THE ATLANTIC COASTAL WATERS. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND, HAIL AND FLOODING 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
1253 PM EDT THU SEP 6 2012
FLZ067-068-072-168-172-061745-
COASTAL BROWARD COUNTY FL COASTAL PALM BEACH COUNTY FL INLAND PALM
BEACH COUNTY FL METRO BROWARD COUNTY FL METRO PALM BEACH COUNTY FL
1253 PM EDT THU SEP 6 2012
...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR NORTHEASTERN
BROWARD COUNTY...SOUTHEASTERN PALM BEACH COUNTY...FOR FREQUENT TO
EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 TO 55 MPH...UP TO
NICKEL-SIZED HAIL...
* UNTIL 145 PM EDT
* AT 1250 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR LAUDERDALE LAKES...AND MOVING NORTH AT 10
MPH.
* THE STORM WILL AFFECT...
NORTH LAUDERDALE...
SEA RANCH LAKES...
POMPANO BEACH...
NORTH POMPANO BEACH...
COCONUT CREEK...
PARKLAND...
AND SURROUNDING COMMUNITIES.
FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 TO 55 MPH...UP
TO NICKEL-SIZED HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF
THESE ARE POSSIBLE. 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 2626 8007 2615 8010 2614 8009 2608 8012
2613 8031 2647 8023 2642 8006
TIME...MOT...LOC 1653Z 197DEG 11KT 2619 8019
10SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 320 PM EDT THU SEP 6 2012 FLZ067-071-061945- INLAND BROWARD COUNTY FL INLAND PALM BEACH COUNTY FL 320 PM EDT THU SEP 6 2012 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR NORTHERN BROWARD COUNTY...SOUTHWESTERN PALM BEACH COUNTY...FOR FREQUENT TO EXCESSIVE LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH... * UNTIL 345 PM EDT * AT 317 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 3 MILES SOUTHWEST OF HOLEY LAND WILDLIFE MANAGEMENT AREA...AND MOVING EAST NORTHEAST AT 15 MPH. * THE STORM WILL AFFECT... HOLEY LAND WILDLIFE MANAGEMENT AREA... OKEELANTA... 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 2672 8054 2633 8038 2620 8078 2659 8086 TIME...MOT...LOC 1920Z 257DEG 16KT 2639 8074 AK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 340 PM EDT THU SEP 6 2012 FLZ071>073-062015- INLAND BROWARD COUNTY FL INLAND MIAMI-DADE COUNTY FL METRO BROWARD COUNTY FL 340 PM EDT THU SEP 6 2012 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR SOUTHERN BROWARD COUNTY...NORTHERN MIAMI-DADE COUNTY...FOR * UNTIL 415 PM EDT * AT 339 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR INTERSECTION KROME AND U.S. 27...AND MOVING NORTHEAST AT 15 MPH. * THE STORM WILL AFFECT... INTERSECTION KROME AND U.S. 27... MIRAMAR... PEMBROKE PINES... INTERSECTION I-75 AND GRIFFIN ROAD... AND SURROUNDING COMMUNITIES. THE PRIMARY IMPACTS WILL BE GUSTY WINDS OF 45 TO 55 MPH. 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. TORRENTIAL RAINFALL CAN BE EXPECTED...CAUSING TEMPORARY PONDING ON SOME ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. MOTORISTS SHOULD SLOW DOWN IN HEAVY RAINFALL TO REDUCE THE RISK OF HYDROPLANING AND LEAVE A SAFE DISTANCE BETWEEN OTHER VEHICLES. LAT...LON 2611 8045 2603 8029 2592 8040 2594 8045 TIME...MOT...LOC 1940Z 210DEG 12KT 2595 8041
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 410 PM EDT THU SEP 6 2012 FLZ071-072-172-062100- COASTAL BROWARD COUNTY FL INLAND BROWARD COUNTY FL METRO BROWARD COUNTY FL 410 PM EDT THU SEP 6 2012 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR EASTERN BROWARD COUNTY...FOR FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 TO 55 MPH...UP TO NICKEL-SIZED HAIL... * UNTIL 500 PM EDT * AT 409 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR DAVIE...AND MOVING NORTH AT 15 MPH. * THE STORM WILL AFFECT... DAVIE... MARKHAM PARK... SAWGRASS MILLS MALL... SUNRISE... LAUDERDALE LAKES... TAMARAC... AND SURROUNDING COMMUNITIES. FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 TO 55 MPH...UP TO NICKEL-SIZED HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF THESE ARE POSSIBLE. 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 2634 8039 2628 8011 2599 8022 2602 8046 TIME...MOT...LOC 2010Z 193DEG 13KT 2610 8032 AK
The Miami radar (KAMX), 64 km away, was scanning. The volume nearest the first event began at 20:43 UTC.
2 thunderstorm wind. Local standard time, as filed.
A thunderstorm produced a wind gust of 59 mph measured at a mesonite site at the Broward County School Tech and Support.
A trained spotter estimated a thunderstorm wind gust of 60 mph 8 miles west of Delray Beach along U.S. Highway 441.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2012Every state in 2012This day in weather historyWarnings in Florida, September 2012
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: 413190, 413191.