An upper level low pressure area was located across the Northwest Bahamas with abundant tropical moisture and instability over South Florida.
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 was located across the Northwest Bahamas with abundant tropical moisture and instability over South Florida.
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 3, 1:44 PM EST, 41 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 244 PM EDT MON SEP 3 2012 ...A FEW STRONG STORMS POSSIBLE THROUGH MID WEEK... ...DEEPER MOISTURE RETURNING TO SOUTH FLORIDA LATE THIS WEEK INTO NEXT WEEKEND... .SHORT TERM... AN UPPER LEVEL LOW LOCATED OVER THE NORTHERN BAHAMA ISLANDS WILL MOVE SLOWLY TO THE WEST NORTHWEST TOWARDS FLORIDA THIS AFTERNOON INTO TONIGHT. AT THE SAME TIME...THE EAST AND WEST COAST SEA BREEZES WILL CONTINUE TO DEVELOP AND PUSH INLAND THROUGH THE AFTERNOON HOURS. THIS WILL ALLOW FOR THE CONTINUATION OF SHOWER AND THUNDERSTORM DEVELOPMENT OVER THE INTERIOR AND EAST COAST METRO AREAS WITH THE BEST COVERAGE OVER THE SOUTHEAST PORTIONS OF THE CWA THIS AFTERNOON. SO WILL CONTINUE THE SLIGHT CHANCE TO LOW END CHANCE POPS FOR THE INTERIOR AND EAST COAST METRO AREAS THROUGH THIS EVENING. THE WEATHER WILL THEN BECOME DRY TONIGHT OVER MOST OF THE CWA DUE TO THE LOST OF DAYTIME HEATING. HOWEVER...THE EAST COAST METRO AREAS COULD STILL SEE A SHOWER OR THUNDERSTORMS TONIGHT...DUE TO THE APPROACHING UPPER LEVEL LOW. SO WILL KEEP MOST OF SOUTH FLORIDA DRY TONIGHT...EXCEPT FOR A SLIGHT CHANCE OVER THE EAST COAST METRO AREAS. THE UPPER LEVEL LOW WILL THEN MOVE SLOWLY NORTH ON TUESDAY THROUGH THE LOCAL ATLANTIC WATERS...AND THEN NORTHEAST INTO THE WESTERN ATLANTIC WATERS ON WEDNESDAY. THIS WILL KEEP THE UNSETTLED WEATHER IN PLACE OVER THE CWA FOR BOTH DAYS WITH THE BEST COVERAGE OF SHOWERS AND THUNDERSTORMS OVER THE EAST COAST METRO AREAS. THE MID TO UPPER LEVELS OF THE ATMOSPHERE WILL ALSO REMAIN IN THE -8C TO -9C OVER THE CWA WHICH WILL ALLOW FOR SOME STORMS TO BECOME STRONG THIS AFTERNOON THROUGH WEDNESDAY. THE PRIMARY IMPACTS FROM THE STRONGEST STORMS WILL BE GUSTY WINDS...HAIL...FREQUENT LIGHTNING STRIKES...AND LOCALLY HEAVY RAINFALL. .LONG TERM... THE REMNANT LOW OF ISAAC LOCATED OVER THE TENNESSEE VALLEY IS FORECAST BY THE LONG RANGE MODELS TO MOVE SOUTHWARD INTO THE NORTHERN GULF OF MEXICO LATE THIS WEEK...BEFORE MOVING ACROSS NORTH/CENTRAL FLORIDA THIS WEEKEND. THIS WILL ALLOW FOR THE WINDS TO BECOME SOUTHWEST OVER THE CWA ALONG WITH RETURN OF DEEPER TROPICAL MOISTURE TO THE AREA. SO WILL INCREASE THE POPS OVER ALL OF SOUTH FLORIDA LATE THIS WEEK INTO THIS WEEKEND...WITH THE HIGHEST SCATTERED POPS OVER LAKE OKEECHOBEE AND PALM BEACH COUNTY. THE LATEST HPC GUIDANCE IS ALSO SHOWING RAINFALL TOTALS OF HALF AN INCH TO ONE INCH FOR MOST OF SOUTH FLORIDA FOR LATE THIS WEEK INTO THIS WEEKEND WITH EVEN ONE TO TWO INCHES OVER PALM BEACH COUNTY. HOWEVER...THE CONFIDENCE IS LOW AT THIS TIME FOR THE TOTAL RAINFALL DUE TO THE STRENGTH AND LOCATION OF THE LOW. && .AVIATION... STRONG TO POTENTIALLY SEVERE STORMS ARE POSSIBLE FOR THE REMAINING OF THE AFTERNOON AND EVENING AS COLD AIR AT 500 MB FROM THE UPPER LEVEL LOW LOCATED OVER THE BAHAMA ISLANDS GETS SLOWLY CLOSER TO SOUTH FLORIDA. THE STORM PREDICTION CENTER HAS INDICATED A SLIGHT RISK OF SEVERE STORMS FOR THE EAST COAST. HAS KEPT VCTS UNTIL 04Z FOR ALL EAST COAST TERMINALS. THE STEERING FLOW IS MAINLY FROM THE NORTH...SO ANY THUNDERSTORM THAT DEVELOPS ALONG THE EAST COAST IS EXPECTED TO MOVE TOWARD THE EAST AT FIRST AND THEN TOWARD THE SOUTH. SHRA/TSRA DEVELOPING ALONG THE WEST COAST SEA BREEZE ARE EXPECTED TO MOVE SOUTH AND SOUTH EASTWARD. && .MARINE... THE WINDS WILL REMAIN LESS THAN 5 KNOTS THIS AFTERNOON THROUGH TUESDAY FROM THE SOUTHEAST DIRECTION...BEFORE SLOWLY INCREASING TO 10 TO 15 KNOTS LATE THIS WEEK FROM THE SOUTHWEST DIRECTION. THERE WILL ALSO BE A EAST TO NORTHEAST SWELL OF 1 TO 4 FEET WORKING INTO SOUTH FLORIDA ATLANTIC WATERS LATE THIS WEEK INTO THIS WEEKEND FROM TROPICAL STORM LESLIE IN THE CENTRAL ATLANTIC WATERS. THEREFORE...THE ATLANTIC SEAS WILL REMAIN AT 2 FEET OR LESS TONIGHT THROUGH WEDNESDAY BEFORE INCREASING LATE THIS WEEK. THE GULF WATER SEAS WILL REMAIN AT 2 FEET OR LESS TONIGHT THROUGH LATE THIS WEEK. THE THREAT OF RIP CURRENTS WILL ALSO BE INCREASING LATE THIS WEEK ALONG THE EAST COAST BEACHES OF SOUTH FLORIDA...DUE TO THE INCREASING EAST TO NORTHEAST SWELLS. && .FIRE WEATHER... THE RELATIVE HUMIDITIES WILL REMAIN ABOVE 35 PERCENT THROUGH THIS WEEK...BUT COULD FALL DOWN TO AROUND 40 PERCENT THIS AFTERNOON OVER GLADES AND HENDRY COUNTIES. SO AT THIS TIME...DO NOT EXPECT ANY FIRE WEATHER PROBLEMS FOR SOUTH FLORIDA THROUGH THE WEEK. && .PRELIMINARY POINT TEMPS/POPS... WEST PALM BEACH 75 89 75 89 / 20 40 30 30 FORT LAUDERDALE 78 89 78 89 / 30 40 30 30 MIAMI 77 90 77 90 / 30 40 30 20 NAPLES 74 90 74 89 / 10 20 10 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. && DISCUSSION/MARINE/FIRE...54/BNB AVIATION/RADAR...71/JE
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 1052 AM EDT MON SEP 3 2012 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 040600- 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- 1052 AM EDT MON SEP 3 2012 ...STRONG STORMS POSSIBLE INTERIOR AND EAST COAST METRO AREAS TODAY... ...FLOOD WARNING EAST CENTRAL PALM BEACH COUNTY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS: ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE INTERIOR AND EAST COAST METRO AREAS OF SOUTH FLORIDA TODAY. THE MAIN IMPACT FROM THESE STORMS WILL BE LOCALLY HEAVY RAIN, FREQUENT LIGHTNING STRIKES, GUSTY WINDS, AND HAIL. WINDS: WIND GUSTS UP TO 50 MPH ARE POSSIBLE OVER THE THE INTERIOR AND EAST COAST METRO AREAS TODAY WITH THE STRONGEST STORMS. HAIL: NICKEL SIZE TO EVEN QUARTER SIZE HAIL IS ALSO POSSIBLE WITH THE STRONGEST STORMS OVER THE INTERIOR AND EAST COAST METRO AREAS SOUTH FLORIDA TODAY. FLOODING: ALTHOUGH SOME AREAS HAVE IMPROVED OVER THE PAST FEW DAYS...FLOODING CONTINUES ACROSS PORTIONS OF EAST CENTRAL PALM BEACH COUNTY...ESPECIALLY IN LOXAHATCHEE GROVES AREA. AS A RESULT...THE FLOOD WARNING REMAINS IN EFFECT FOR THIS AREA. RIP CURRENTS: THERE IS A SLIGHT RISK OF RIP CURRENTS AT THE ATLANTIC BEACHES DUE TO EASTERLY ONSHORE WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED THUNDERSTORMS AFFECTING PRIMARILY THE INTERIOR AND EAST CAN BE EXPECTED. THERE WILL ALSO BE AN INCREASE IN THE RISK OF RIP CURRENTS ALONG THE WEST COAST BEACHES OF SOUTH FLORIDA THROUGH THE WEEK. .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. BAXTER
The Miami radar (KAMX), 50 km away, was scanning. The volume nearest the first event began at 19:24 UTC.
1 funnel cloud. Local standard time, as filed.
A Ham Radio operator reported three funnel clouds over a 10 minute period just west of U.S. 27 along Griffin Road.
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: 413170.