An un-seasonal amplified upper level trough and attendant surface front moved into the forecast area during the afternoon and evening hours. Strong differential positive vorticity advection, high surface based instability, large CAPE in the hail growth zone and low level forcing spawned widespread severe storms.
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.
An un-seasonal amplified upper level trough and attendant surface front moved into the forecast area during the afternoon and evening hours. Strong differential positive vorticity advection, high surface based instability, large CAPE in the hail growth zone and low level forcing spawned widespread severe storms. Aloft cool 500 mb around -10 degrees Celsius were noted and mid level dry air moved over the area, and both factors increased downdraft strength in storms.
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 Jul 21, 1:48 PM EST, 1 hour 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 248 PM EDT SAT JUL 21 2007 ...SEVERE TSTM WATCH FOR THE SOUTHERN PORTION OF THE AREA THROUGH 9 PM EDT... .DISCUSSION...SO FAR SO GOOD...WE HAVE A BIT OF CONVECTION FIRING UP ON AN OLD BOUNDARY IN CHARLTON COUNTY GEORGIA BUT OTHERWISE WE REMAIN CONVECTION FREE. THAT IS LIKELY TO CHANGE SOON AS MARION COUNTY HAS CLEARED OUT MUCH EARLIER THAN ELSEWHERE AND WE HAVE GOOD CAPE IN THE LOW LEVELS AND COLD AIR ALOFT. THIS SHOULD PRODUCE A GOOD LAPSE RATE OVER THE COUNTY WITH THE MOST PRONOUNCED BOUNDARY BEING THE PRETTY SHARP BOUNDARY BETWEEN THE CLOUD COVERAGE AND THE CLEAR SKIES OVER THE NORTHERN PORTION OF THE COUNTY. BET THERE WILL BE ENOUGH TEMP CONTRASTS FOR CONVECTION TO FIRE THERE FIRST THIS AFTERNOON. HOPEFULLY ALL OF THE SEVERE STUFF STAYS SOUTH OF THE FORECAST AREA BUT IF I HAD TO BET ID PLACE MY MONEY ON SOMETHING HAPPENING IN MARION COUNTY. LOOKING AT THE SYNOPTIC SITUATION I HAVE TO ASK...IS THIS JULY? AS ALMOST LOOKS MORE LIKE A WINTER TIME TYPE PATTERN THAN MID SUMMER WITH A CLOSED UPPER LEVEL LOW OVER THE APPALACHIANS AND AN OLD FRONTAL BOUNDARY DRAPED ACROSS NORTH FLORIDA. THE FRONT WILL REMAIN ACROSS THE AREA FOR THE NEXT SEVERAL DAYS WITH COLD AIR ALOFT. SO EXPECT THE BEST CHANCE OF RAIN AND CONVECTION TO BE ACROSS THE FLORIDA PORTION THROUGH MONDAY WHERE THE GREATEST LIFT AND MOISTURE WILL BE CONCENTRATED. AS A RIDGE OVER THE MID- ATLANTIC STATES SHIFTS EAST THE RETURN FLOW WILL BRING INCREASING MOISTURE OUT OF THE GULF AND A RETURN TO NORMAL DIURNAL CONVECTION ACROSS THE ENTIRE AREA FOR NEXT WEEK. IN THE EXTENDED THE UPPER LEVEL LOW SLOWLY RETROGRADES AND DECAYS OVER THE MID WEST WITH THE MID-ATLANTIC RIDGE RE-ESTABLISHING ITS SELF ACROSS THE REGION INTO NEXT WEEKEND. && .AVIATION...VFR CONDS CONTINUE EXCEPT IN AREAS NEAR STORMS. AS WINDS SHIFT NE-E... OCCASIONAL MVFR CONDS WILL BE POSSIBLE EARLY SUNDAY MORNING FOR TAF SITES NEAR COAST. && .MARINE...NO HEADLINES. AS TROUGH SETTLES SOUTH OF THE AREA WINDS WILL SHIFT TO ONSHORE SUNDAY AND MONDAY. THEN A RIDGE WILL BUILD OVER THE WRN ATLANTIC SETTING UP SLY FLOW FOR REMAINDER OF NEXT WEEK. && .PRELIMINARY POINT TEMPS/POPS... AMG 69 90 66 91 / 30 40 10 20 SSI 74 85 71 85 / 40 50 10 20 JAX 71 87 68 87 / 50 60 20 30 SGJ 74 82 72 84 / 60 70 20 40 GNV 71 87 69 87 / 50 70 30 40 OCF 72 87 69 87 / 50 70 30 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...NONE. GA...NONE. AM...NONE. && SANDRIK/TRABERT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSONVILLE FL 1122 AM EDT SAT JUL 21 2007 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-212200- ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY- CAMDEN (COASTAL)-CAMDEN (INLAND)-CHARLTON-CLAY-CLINCH-COFFEE- COLUMBIA-DUVAL-ECHOLS-FLAGLER-GILCHRIST-GLYNN (COASTAL)- GLYNN (INLAND)-HAMILTON-JEFF DAVIS-MARION-NASSAU-PIERCE-PUTNAM- ST JOHNS-SUWANNEE-UNION-WARE-WAYNE- 1122 AM EDT SAT JUL 21 2007 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. THIS AFTERNOON AND TONIGHT... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE SOUTHERN COUNTIES UNTIL 9 PM EDT... A COLD FRONT WILL SAG TO NEAR THE FLORIDA-GEORGIA LINE TODAY. THIS FEATURE IN COMBINATION WITH AN UPPER LEVEL DISTURBANCE WILL LEAD TO SCATTERED TO NUMEROUS THUNDERSTORMS ACROSS NORTHEAST FLORIDA AND EXTREME SOUTHEAST GEORGIA. ISOLATED SEVERE STORMS WILL BE POSSIBLE THIS AFTERNOON AND EVENING...IN AND NEAR THE WATCH AREA. LARGE HAIL UP TO ONE AND ONE HALF INCH IN DIAMETER AND DAMAGING WINDS WILL BE THE PRIMARY CONCERNS WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED EACH DAY WITH STRONG TO SEVERE THUNDERSTORMS POSSIBLE SUNDAY AFTERNOON AND EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTERS ACTIVATION IS REQUESTED ACROSS NORTH FLORIDA FOR THIS AFTERNOON AND THIS EVENING. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. SANDRIK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 327 PM EDT SAT JUL 21 2007 FLZ024-GAZ164-212015- CHARLTON-NASSAU- 327 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR CENTRAL CHARLTON AND NORTHWEST NASSAU COUNTIES FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 415 PM EDT... AT 327 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 8 MILES WEST OF HILLIARD...MOVING SOUTHEAST AT 5 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND HILLIARD THROUGH 415 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING AREAS. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. ZAPPE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 342 PM EDT SAT JUL 21 2007 FLZ040-212045- MARION- 342 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR EXTREME SOUTHWESTERN MARION COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 445 PM EDT... AT 342 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 2 MILES EAST OF DUNNELLON...OR 7 MILES SOUTH OF RAINBOW LAKES ESTATES...MOVING EAST BETWEEN 5 AND 10 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND RAINBOW LAKES ESTATES AND DUNNELLON THROUGH 445 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING AREAS. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. ZAPPE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 347 PM EDT SAT JUL 21 2007 FLZ023-212045- BAKER- 347 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR NORTHERN BAKER COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 445 PM EDT... AT 347 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 2 MILES NORTH OF TAYLOR...OR 21 MILES SOUTHEAST OF FARGO...MOVING SLOWLY EAST 5 TO 10 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND TAYLOR THROUGH 445 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING AREAS. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. ZAPPE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 353 PM EDT SAT JUL 21 2007 FLZ040-212100- MARION- 353 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR EXTREME EASTERN MARION COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 500 PM EDT... AT 353 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 3 MILES EAST OF JUNIPER SPRINGS...MOVING SOUTHEAST AT 5 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND JUNIPER SPRINGS THROUGH 500 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING AREAS. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. ZAPPE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 416 PM EDT SAT JUL 21 2007 FLZ025-212100- DUVAL- 416 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR DUVAL COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 500 PM EDT... AT 416 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS CENTERED 12 MILES WEST OF JACKSONVILLE INTERNATIONAL AIRPORT...OR 8 MILES SOUTHWEST OF CALLAHAN...MOVING EAST AT 20 MPH. THESE STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND JACKSONVILLE INTERNATIONAL AIRPORT...OCEANWAY...DOWNTOWN JACKSONVILLE... TALLYRAND...FORT CAROLINE AND ARLINGTON THROUGH 500 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. IF FURTHER INTENSIFICATION OCCURS A WARNING MAY BE REQUIRED. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. HURLBUT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 421 PM EDT SAT JUL 21 2007 FLZ025-212100- DUVAL- 421 PM EDT SAT JUL 21 2007 ...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR DUVAL COUNTY FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 500 PM EDT... AT 421 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 3 MILES SOUTH OF UNF...NEARLY STATIONARY. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS AROUND UNF...BAYARD...SAN PABLO AND JACKSONVILLE BEACH THROUGH 500 PM EDT. HAIL UP TO ONE HALF INCH IN DIAMETER HAS BEEN REPORTED... AND EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. HURLBUT
The national radar mosaic for the moment the first event began.
9 thunderstorm wind, 5 hail, 2 heavy rain. Local standard time, as filed.
A spotter reported penny size hail in an isolated area of Highway 177, about 8 miles Northeast of Fargo.
Trees and power lines were blown down across the city. Power was out across much of Waycross.
Trees were blown down along the State Road 121 corridor near Surrency.
Heavy rainfall occurred in many areas of Waycross. Carswell Avenue, Plant Avenue, State Street, Memorial Drive, Riverside Drive and Haines Avenue all experienced some flooding. About one a half feet of water was across the highway.
Large pecan trees were blown down on Albany Avenue near the Intersection of Highway 82.
A spotter reported 40 mph wind gusts and quarter to golf-ball size hail on State Road 32, about 4 miles east of Patterson.
Trees and power lines were blown down along Highway 82 between Atkinson and Waynesville. There were some power outages.
Nickel size hail was reported on County Road 202, 5 miles east of Blackshear.
Around 835 pm local time, a spotter measured a 52 knot wind gust about 5 miles east of Blackshear. The spotter also noted trees were down across County Road 202. Around 845 pm in Blackshear, two large pecan trees were broken at 119 Hobbs Street. Trees and power lines were also blown down in the Cherry Street Extension Area. By 9 pm, power lines and some trees were blown down just south of Blackshear.
A spotter reported nickel size hail about 2 miles east of Argyle around 903 pm local time. At 930 pm, the spotter reported quarter size hail with 50 mph wind gusts in Homerville. Minor street flooding was also reported in Homerville.
Trees and power lines were blown down across the county.
Widespread trees and power lines were blown down across the northeast portions of Clinch county.
Trees were blown down onto power lines in Stephen Foster State Park which caused some power outages.
Penny to nickel size hail was reported along Highway 187, about 5 miles south of Homerville.
A spotter reported at least 3 inches of standing water was over roads about 2 miles southeast of Homerville. A car was run off the road into a culvert along Highway 441. Three inches of rainfall was measured from 830-1115 pm local time in Homerville.
Large trees and power lines were blown down in western Stephen Foster State Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2007Every state in 2007This day in weather historyWarnings in Georgia, July 2007
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: 47403, 44960, 44961, 44969, 44962, 44955, 44963, 44956, 44964, 44957, 44965, 44970, 44966, 44958, 44959, 44968.