Scattered to numerous severe storms ignited across an unstable airmass as a short wave trough moved across the area during the afternoon and evening.
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 JAX wrote it up.
Scattered to numerous severe storms ignited across an unstable airmass as a short wave trough moved across the area during the afternoon and evening.
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 Jacksonville, FL wrote its last area forecast discussion before the first event at Aug 12, 1:27 PM EST, 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 227 PM EDT FRI AUG 12 2011 ...SCATTERED TO ISOLATED STRONG STORMS THROUGH MON... .SHORT TERM...UPPER LEVEL TROUGHING WILL PERSIST OVER THE EASTERN CONUS AS SEVERAL EMBEDDED UPPER LEVEL IMPULSES RIDE THROUGH THE BASE OF THE TROUGH AND ACROSS THE LOCAL FORECAST AREA. IN THE LOWER LEVELS...A BROAD SURFACE LOW NOW LOCATED NEAR DUVAL COUNTY BASED ON MSLP VALUES WILL RETROGRADE (MOVE WESTWARD) WHILE BECOMING DIFFUSE THROUGH THE WEEKEND. THE COMBINATION OF PREVAILING AND MOIST LOW LEVEL WSW FLOW AROUND THIS LOW...UPPER LEVEL DISTURBANCES AND THE SEA BREEZES ALL INTERACTING OVER AN UNSTABLE AIRMASS WILL CONTINUE TO BRING GOOD CHANCES OF MAINLY AFTN AND EARLY EVENING SHOWERS AND THUNDERSTORMS TO THE FORECAST AREA THROUGH SUN. LATE SUN INTO MON THE UPPER TROUGH AXIS SHIFTS EAST OF THE LOCAL FORECAST AREA WITH A DRIER NW FLOW OVER THE LOCAL CWA. THIS WILL DECREASE POPS N-S NEXT WEEK WITH THE SREF ADVERTISING PRECIPITABLE WATER VALUES DECREASING BELOW 1.3 INCHES ACROSS OUR GA ZONES MON AFTN. THIS AFTN EXPECT SCATTERED STRONG TO SEVERE STORMS WILL BE MOST LIKELY ACROSS OUR INLAND FL ZONES ALONG AND SOUTH OF A JACKSONVILLE TO GAINESVILLE LINE. THIS IS WHERE UPPER LEVEL ENERGY FROM AN IMPULSE OVER THE FL PANHANDLE FOCUS ALONG WITH CONVERGENCE FROM THE SEA BREEZES DURING MAX SFC BASED INSTABILITY AFTER 18Z. IN ADDITION TO WET DOWNBURSTS...WE COULD ALSO SEE SOME HAIL REACH THE SURFACE UNDER STRONGER CELLS GIVEN COOLING ABOVE 830 MB PER THE 12Z JAX RAOB AND DIRECTIONAL SHEAR IN THE HAIL GROWTH ZONE (UPDRAFT -10 TO -20 DEG C LAYER). SCATTERED STRONG TO ISOLATED SEVERE STORMS WILL REMAIN POSSIBLE THROUGH THE WEEKEND WITH COOLER 500 MB TEMPS IN THE -6 TO -7 DEG RANGE... ALTHOUGH WET DOWNBURSTS WILL BE THE PRIMARY CONVECTIVE HAZARD (IN ADDITION TO FREQUENT LIGHTNING) GIVEN NEARLY UNIDIRECTIONAL WESTERLY FLOW IN THE MID/UPPER LEVELS AND WEAK STEERING FLOW. CONVECTION WILL FOCUS ACROSS INLAND AREAS WITH A SEA BREEZE AND OUTFLOW CONVERGENCE MOST FOCUSED TOWARD THE I-75 CORRIDOR IN THE EARLY EVENING SAT UNDER LOW LEVEL ESE FLOW...THEN THE REGIME SHIFTS ON SUNDAY WITH CONVERGENCE FOCUSED TOWARD THE I-95 CORRIDOR IN THE LATE AFTN/EARLY EVENING AS LOW LEVEL FLOW BECOMES MORE WSW. ALTHOUGH CONVECTION COVERAGE WILL BE MORE LIMITED ON MON GIVEN INFILTRATION OF DRIER AIR...SEVERE STORM POTENTIAL INCREASES DUE TO INCREASED SHEAR ALOFT AND DRY AIR ENTRAINMENT INTO CELLS INCREASING EVAPORATIVE COOLING AND THUS THEIR DOWNBURST POTENTIAL. HOT TEMPS AND HIGH HUMIDITIES WILL CONTINUE THIS WEEKEND WITH UPPER 90S INLAND AND MID 90S ALONG THE ATLANTIC COAST UNTIL THE AFTERNOON EAST COAST SEA BREEZE DEVELOPS. && .LONG TERM...AN UPPER LEVEL TROUGH WILL POSITION OVER THE ATLANTIC SEABOARD THROUGH FRI WITH A DRY NW FLOW ACROSS THE LOCAL AREA. THE LOW LEVEL BERMUDA RIDGE AXIS WILL BUILD NORTH OF THE AREA WED INTO FRI AND BRING A SHALLOW ESE FLOW REGIME. POPS WILL BE BELOW NORMAL THROUGH THE PERIOD GIVEN LIMITED MOISTURE WITH ABOUT 10-20% ACROSS SE GA AND ABOUT 20-30% ACROSS NE FL EACH AFTN. HIGHS WILL RANGE IN THE LOW/MID 90S WITH LOWS IN THE LOW/MID 70S...WITH SOME UPPER 60S POSSIBLE WELL INLAND. && .AVIATION...MAINLY VFR CONDS EXPECTED. TSRA EXPECTED AFTER 19Z TO 20Z AT FLORIDA TERMINALS MAINLY FROM SEA BREEZE INFLUENCES. WILL MONITOR FOR PSBL STORMS NEAR SSI. HAVE MVFR VSBY FOR GNV AND VQQ AFTER 08Z SAT MORNING. && .MARINE...A FAIRLY QUIET PATTERN CONTINUES INTO THE WEEKEND. AS A SURFACE TROUGH APPROACHES FROM THE NORTH ON SUNDAY...THE PRESSURE GRADIENT TIGHTENS. NOCTURNAL SURGES WITH S TO SW WINDS ARE EXPECTED EARLY NEXT WEEK. NO HEADLINES ARE ANTICIPATED. && .PRELIMINARY POINT TEMPS/POPS... AMG 74 93 73 93 / 20 40 20 30 SSI 80 88 78 91 / 20 30 20 40 JAX 77 92 76 93 / 30 30 20 40 SGJ 79 90 77 92 / 30 30 20 40 GNV 74 94 74 92 / 30 50 20 40 OCF 75 93 74 92 / 30 40 30 40 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && ENYEDI/TRABERT
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE JACKSONVILLE FL 204 PM EDT FRI AUG 12 2011 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-131000- HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY- ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE- JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY- INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN- COASTAL CAMDEN- 204 PM EDT FRI AUG 12 2011 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. ...STRONG STORMS POSSIBLE THIS AFTERNOON AND EVENING... ...DANGEROUS HEAT INDICES THIS AFTERNOON... .DAY ONE...TODAY AND TONIGHT... HIGH TEMPERATURES IN THE MID TO UPPER 90S ALONG WITH HIGH HUMIDITIES WILL PUSH HEAT INDICES INTO THE 105 TO 110 RANGE DURING THE AFTERNOON HOURS. DRINK PLENTY OF FLUIDS...STAY IN AIR-CONDITIONING IF POSSIBLE...REMAIN OUT OF THE SUN...AND TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE. SCATTERED THUNDERSTORMS ARE EXPECTED MAINLY ACROSS THE INLAND AREAS THIS AFTERNOON AND EVENING AS THE SEA BREEZES INTERACT WITH A SERIES OF UPPER DISTURBANCES MOVING ACROSS THE AREA. SCATTERED STORMS MAY BECOME STRONG TO SEVERE...AND WILL BE CAPABLE OF PRODUCING STRONG AND GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. SLOW STORM MOTION TO THE EAST 10 MPH OR LESS WILL ENABLE PERIODS OF HEAVY RAINFALL AND PRODUCE MINOR LOCALIZED FLOODING. STORMS WILL DECREASE IN INTENSITY AND COVERAGE BY MIDNIGHT TONIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... HEAT INDICES OF AROUND 105 DEGREES ARE EXPECTED EACH AFTERNOON THROUGH MONDAY. SCATTERED THUNDERSTORM ACTIVITY CAN BE EXPECTED EACH AFTERNOON THROUGH MONDAY. SCATTERED STRONG TO ISOLATED SEVERE STORMS WILL BE POSSIBLE AND CAPABLE OF PRODUCING WET DOWNBURSTS AND FREQUENT LIGHTNING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. PP/ABE
The Jacksonville radar (KJAX), 119 km away, was scanning. The volume nearest the first event began at 19:27 UTC.
13 thunderstorm wind, 3 lightning, 2 hail. Local standard time, as filed.
Lightning caused a house fire off of Edge Road Lane in Palm Coast. As of 0730 pm LST, the fire was still active. The cost of damage was estimated.
Three large trees were blown down at Huninton Road at the railroad tracks. The Amtrack train had to be stopped along the tracks because debris was still being cleared about an hour after the event happened.
Trees were blown down at Oleander Street and Lake Margaret Blvd.
Trees were blown down at Sunset Drive and Hess Road.
Numerous trees were blown down within the Anthony city limits. The time of damage was based on radar imagery.
A home was damaged by a fallen tree The time of the event was based on radar. The cost of damage was unknown.
A tree was blown down at 1550 W Newberry Rd.
County dispatch reported widespread tree damage along Highway 301 and County Road 318 in the city limits of Citra. An hour later, numerous road crews were out still trying to clear the roads.
Lightning caused a house fire along Morrison Road. The home was severely damaged, and the cost of damage was estimated.
Golf ball size hail was reported along U.S. Highway 17 just north of County Road 220 on Fleming Island at the Granite Transformations Show Room.
Quarter size hail was reported along Moody Drive near Doctors Lake.
Trees were down along Maxville Middleburg Road.
Trees were blown down in Mandarin.
Trees were blown down at the Bradford Motel and Campground in Starke. One tree fell on a vehicle. Another was blown down on NE 28th Avenue.
The Jacksonville Electric Authority confirmed that numerous crews responded to power line damage across the Jacksonville southside including along San Pablo and Hodges Blvd.
Lightning started a house fire off of Trail Ridge Road in the Two Creeks Subdivision. The time of the strike was unknown, but the most frequent lightning that impacted the area occurred between 0530 pm and 7 pm LST. The cost of damage was estimated.
An employee at the T & F Electric Company reported several trees were blown down along Breezy Point Road.
The T & F Electric Company reported several trees down along SW Big Tree Road.
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, August 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: 329659, 329662, 329663, 329664, 329665, 329666, 329667, 329669, 329660, 329657, 329658, 329671, 329672, 329673, 329674, 329661, 329675, 329676.