Numerous strong thunderstorms formed over Lake, Orange and Seminole Counties and moved southeast. A funnel cloud formed in association with one of the cells.
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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 MLB wrote it up.
Numerous strong thunderstorms formed over Lake, Orange and Seminole Counties and moved southeast. A funnel cloud formed in association with one of the cells.
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 Melbourne, FL wrote its last area forecast discussion before the first event at Sep 12, 2:20 PM EST, 4 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 320 PM EDT SUN SEP 12 2010 .DISCUSSION... CURRENTLY/TONIGHT...SEA BREEZE BOUNDARY WILL BE SLOWER TO MOVE INLAND NORTH OF THE CAPE THIS AFT WITH EAST/WEST COAST SEA BREEZE COLLISION EXPECTED MORE TOWARD THE I-4 CORRIDOR FROM INTERIOR VOLUSIA THROUGH KISSIMMEE AROUND SUNSET. THIS SHOULD ALLOW FOR MORE SCT DEVELOPMENT OF STORMS INTO THE EARLY EVE. A SLIGHTLY STRONGER N/NW STEERING FLOW WILL HAVE THE POTENTIAL TO PUSH THIS CONVECTION BACK TOWARD THE VOLUSIA AND BREVARD COASTLINE THROUGH MIDNIGHT. A FRONTAL BOUNDARY WILL CONTINUE TO BUILD SOUTHWARD INTO NORTHERN CENTRAL FL LATER TONIGHT. HOWEVER IT WILL WEAKEN AS IT DOES SO WITH ADDITIONAL PRECIP GENERATION NOT EXPECTED OVERNIGHT...EXCEPT FOR PERHAPS OVER THE COASTAL WATERS. MONDAY...FRONTAL TROUGH WILL CONTINUE TO BUILD SOUTHWARD ACROSS THE AREA INTO THE MORNING HOURS. DRIER AIR WILL BUILD IN BEHIND THIS BOUNDARY WHICH WILL KEEP RAIN CHANCES LIMITED ONCE AGAIN ACROSS THE AREA. HAVE KEPT RAIN CHANCES MAINLY AROUND 20% OVER THE CWA...EXCEPT FOR 30% TOWARD THE SRN TREASURE COAST AND OKEECHOBEE COUNTY WHERE GREATEST MOISTURE WILL RESIDE. NORTHEAST WINDS WILL INCREASE INTO THE AFTERNOON AS A HIGH PRESSURE SYSTEM NEAR THE AR/MO BORDER MOVES EAST TOWARD THE TENNESSEE VALLEY. THIS WILL ALLOW FOR FASTER INLAND MOVEMENT OF THE ECSB WITH HIGHS MORE TOWARD NORMAL VALUES AROUND THE UPPER 80S ALONG THE COAST TO LOW 90S INLAND. TUE-WED...WEAK SFC TROUGH OVER SRN HALF CWA WL BECOME DIFFUSE AS IT GETS BRIDGE BY HIGH PRES CTRD BUILDING SEWD FROM THE MID MS AND TN VLYS INTO THE WRN ATLC BY TUE AFTN. THIS SFC HIGH WILL GET A SLGT REINFORCEMENT BY A SECOND OF SIMILAR STRENGTH ON WED. LCL ONSHORE FLOW REGIME WITH LWR THAN NORMAL MEAN MOISTURE VALUES ARGUES FOR BELOW NORMAL POPS. HAVE CONFINED 20 PERCENT POPS TO THE SRN AND CSTL AREAS. THINK MEAN MOISTURE WILL DECREASE ENOUGH OVER THE SOUTH BY WED SO THAT WE CAN REMOVE MENTION OF TS THERE...AND KEEP POPS CONFINED TO EARLY IN THE DAY AS MARINE MODIFIED AIR QUICKLY OVERSPREADS THE CWA FROM EAST TO WEST. NR TO SLGTLY ABOVE NORMAL MAXES MON WITH MINS IN THE M-U70S. OTRW...DVLPG ONSHORE FLOW WILL KEEP MAXES DOWN IN THE U80S-L90S WITH MINS DRIER AIR ALLOWING MINS TO FALL INTO THE IN THE L-M70S INLAND...BUT STAY IN THE M-U70S NEAR THE COAST. THU-SAT...ONSHORE FLOW WILL CONTINUE AS THE ATLANTIC HIGH PRESSURE RIDGE REMAINS ORIENTED NE-SW FROM OFFSHORE THE CAROLINAS INTO THE SERN CONUS. WHILE THERE ARE SOME DIFFS BTWN THE GFS AND ECM IN SUBTLE FEATURES MOVING WWD ON THE SOUTH SIDE OF THE RIDGE...BOTH MODELS SHOW A WEAK TROUGH MOVING WWD ACROSS THE STATE...SOMEWHERE BTWN FRI AND LATE SAT. MEAN PWATS REMAIN A FEW TENTHS BELOW THE NORMAL MID SEP VALUE OF 1.6...WITH AIR MASS QUICKLY MODIFYING IN ONSHORE FLOW EACH AFTERNOON. CONSEQUENTLY...POPS WILL REMAIN MINIMAL MOSTLY IN THE FORM OF LATE NGT/EARLY MORNING SHRA NEAR THE COAST. TEMPS GNRLY REMAIN L90S/L70S INLAND...AND U80S/M70S NEAR THE COAST. && .AVIATION... SEA BREEZE COLLISION TOWARD I-4 CORRIDOR TOWARDS SUNSET WILL PRODUCE ADDITIONAL SCT SHRA/TSRA ACTIVITY INTO EARLY EVENING WITH SOME MOVEMENT BACK TOWARD THE VOLUSIA/BREVARD COASTLINE THROUGH MIDNIGHT. TEMPO IFR/MVFR CONDS CAN BE EXPECTED WITH THIS ACTIVITY THRU 04Z. AFTERWARDS...VFR CONDS SHOULD PREVAIL INTO THE MORNING HOURS BEFORE ISO CONVECTION ONCE AGAIN REDEVELOPS ACROSS THE AREA BY MON AFT. && .MARINE... A WEAK FRONTAL BOUNDARY WILL BUILD SOUTHWARD OVER THE WATERS BEGINNING LATE TONIGHT INTO TOMORROW. S/SW WINDS TONIGHT WILL BECOME MORE N/NE BEHIND THE BOUNDARY AND INCREASE INTO MON AFT UP TO AROUND 10-15 KTS. THIS WILL INCREASE SEAS ONLY SLIGHTLY FROM AROUND 1-2 FT TONIGHT UP TO 2-3 FT TOMORROW. TUE-FRI...HIGH PRES WILL STEADILY BUILD SWD FROM THE SERN CONUS INTO THE WRN ATLC...PRODUCING A FRESHENING ONSHORE FLOW THAT WILL BCM STEADY IN THE 12-15KT THROUGH MID WEEK...THEN INCREASE TO 14-18KT THEREAFTER. SEAS GRDLY BUILD...WITH COMBINATION OF LENGTHENING FETCH AND DURATION OF ONSHORE WINDS LEADING TO INCREASING SWELL COMPONENT LATE WED INTO THU. MAY WIND UP NEEDING A CAUTIONARY STMT BY THEN...OTHERWISE A SLOW INCREASE IN WINDS/SEAS IN INDICATED FROM DAYS 2 THRU 5. && .PRELIMINARY POINT TEMPS/POPS... DAB 77 89 76 88 / 30 10 10 10 MCO 76 93 74 91 / 30 20 10 10 MLB 76 89 78 88 / 20 20 20 20 VRB 74 90 76 88 / 10 20 20 20 LEE 77 93 74 92 / 30 20 10 10 SFB 76 93 74 91 / 30 20 10 10 ORL 77 93 75 91 / 30 20 10 10 FPR 73 90 77 88 / 10 20 20 20 && .MLB WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. && SHORT TERM...WEITLICH LONG TERM....KELLY
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1219 PM EDT SUN SEP 12 2010 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-130000- COASTAL WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE OUT 20 NM- COASTAL WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN INLET OUT 20 NM- COASTAL WATERS FROM SEBASTIAN INLET TO JUPITER INLET OUT 20 NM- WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE 20 TO 60 NM OFFSHORE- WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN INLET 20 TO 60 NM OFFSHORE- WATERS FROM SEBASTIAN INLET TO JUPITER INLET 20 TO 60 NM OFFSHORE- INLAND VOLUSIA-NORTHERN LAKE-ORANGE-SEMINOLE-SOUTHERN BREVARD- OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-COASTAL VOLUSIA- SOUTHERN LAKE-NORTHERN BREVARD- 1219 PM EDT SUN SEP 12 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT. ...THUNDERSTORM IMPACT... AT MID DAY THE EAST COAST SEA BREEZE HAD FORMED ALONG THE IMMEDIATE COAST SOUTH OF THE CAPE. THE SEA BREEZE WILL BE DELAYED NORTH OF THE CAPE BUT WILL STILL DEVELOP BY MID AFTERNOON. ISOLATED SHOWERS AND LIGHTNING STORMS CAN BE EXPECTED AS THIS BOUNDARY PUSHES SLOWLY INLAND. COVERAGE AND INTENSITY OF STORMS WILL INCREASE WITH THE COLLISION OF THE EAST AND WEST COAST BREEZES EARLY THIS EVENING...BETWEEN 6 AND 9 PM....ROUGHLY ALONG THE I 4 CORRIDOR. STORM MOTION WILL BE TOWARD THE SOUTH AT 10 TO 15 MPH. THE MAIN THREATS WILL BE FREQUENT CLOUD TO GROUND LIGHTNING STRIKES AND GUSTY WINDS AROUND 40 MPH. ...FLOOD IMPACT... A FEW STORMS WILL BE CAPABLE OF PRODUCING RAIN AMOUNTS IN EXCESS OF TWO TO THREE INCHES IN SPOTS...ESPECIALLY ALONG THE I 4 CORRIDOR EARLY THIS EVENING. LOW LYING AND POOR DRAINAGE AREAS THAT HAVE RECEIVED RECENT HEAVY RAINS WILL BE ESPECIALLY PRONE TO TEMPORARY FLOODING. ...RIP CURRENT IMPACT... A SMALL LONG PERIOD SWELL AND CUTS IN THE NEAR SHORE SAND BARS FROM LARGE SWELLS LAST WEEKEND WILL PRODUCE AN ELEVATED RIP CURRENT RISK AT AREA BEACHES TODAY. THE RISK WILL BE HIGHEST IN THE AFTERNOON DURING THE OUTGOING TIDE. CHECK WITH LOCAL BEACH PATROLS ON CONDITIONS WHEN ARRIVING AT THE BEACH. IF ENTERING THE WATER...ALWAYS STAY WITHIN SIGHT OF A LIFEGUARD. ...MARINE THUNDERSTORM GUST IMPACT... LIGHTNING STORMS THAT FORM AS A RESULT OF THE SEA BREEZE COLLISION EARLY THIS EVENING WILL BE CAPABLE OF PRODUCING WIND GUSTS OF 34 KNOTS OR GREATER AND FREQUENT LIGHTNING STRIKES. STORM MOVEMENT WILL BE TOWARDS THE SOUTH AT 10 TO 15 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. DRY AIR MASS IN THE MID LEVELS LIMITS RAIN CHANCE THROUGH THE EXTENDED. HIGH PRESSURE REMAINING NORTH OF FLORIDA WILL RESULT IN CONTINUED ONSHORE WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. KELLY/WIMMER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MELBOURNE FL 711 PM EDT SUN SEP 12 2010 FLZ053-122345- OSCEOLA- 711 PM EDT SUN SEP 12 2010 ...STRONG STORM NEAR HOLOPAW... AT 708 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG STORM WITH GUSTY WINDS OF 40 TO 45 MPH...FREQUENT LIGHTNING AND LOCALLY HEAVY RAINFALL NEAR HOLOPAW MOVING SOUTH AT 10 MPH. THIS STORM WILL APPROACH FOREVER FLORIDA THROUGH 745 PM. THE PRIMARY THREAT WILL BE CLOUD TO GROUND LIGHTNING STRIKES AND GUSTY WINDS TO NEAR 45 MPH...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND. HEAVY RAINFALL WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE STORM PASSES. 15
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MELBOURNE FL 718 PM EDT SUN SEP 12 2010 FLZ044>046-122345- NORTHERN LAKE COUNTY-ORANGE-SEMINOLE- 718 PM EDT SUN SEP 12 2010 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS BETWEEN 45 AND 50 MPH OVER NORTHERN LAKE COUNTY...NORTHWESTERN ORANGE COUNTY...SOUTHWESTERN SEMINOLE COUNTY... * UNTIL 745 PM EDT. AT 714 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STORM CAPABLE OF PRODUCING STRONG WIND GUSTS NEAR MOUNT PLYMOUTH...MOVING SOUTHEAST AT 10 MPH. THIS STORM WILL ALSO PRODUCE FREQUENT LIGHTNING AND LOCALLY HEAVY RAINFALL AMOUNTS OF ONE TO TWO INCHES. LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS INCLUDE ROCK SPRINGS...WEKIWA SPRINGS STATE PARK AND WEKIVA SPRINGS. THE PRIMARY THREAT WILL BE CLOUD TO GROUND LIGHTNING STRIKES AND GUSTY WINDS OF 45 TO 50 MPH...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE LIMBS OR CAUSE POWER OUTAGES. HEAVY RAINFALL WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE STORM PASSES. LAT...LON 2896 8152 2863 8126 2850 8153 2887 8170 TIME...MOT...LOC 2315Z 331DEG 11KT 2884 8157 15
The Melbourne radar (KMLB), 118 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
1 funnel cloud. Local standard time, as filed.
A trained storm spotter observed funnel cloud formation over rural Lake County, about 10 miles northwest of his location.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2010Every state in 2010This day in weather historyWarnings in Florida, September 2010
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: 249623.