Alert archive / Georgia / Tornado Watches in 2021
Tornado Watch 342
The Storm Prediction Center issued this tornado watch at Jul 7, 2021, 1:04 PM EDT for 9 counties in Florida; 21 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2021, 1:04 PM EDT (17:04 UTC)
- Expired
- Jul 7, 2021, 8:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Strongest gust expected
- 60 kt
All 30 counties
Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Hamilton County, FL, Nassau County, FL, Saint Johns County, FL, Union County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA
The radar
The Jacksonville radar (KJAX), 110 km from the middle of the area, began a volume at 17:05 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 20%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 4:04 PM EDT | Tornado Warning | CHS | Bulloch, Candler | 26 min |
| Jul 7, 4:32 PM EDT | Tornado Warning | JAX | Duval, Saint Johns | 28 min |
| Jul 7, 4:54 PM EDT | Tornado Warning | JAX | Duval, Nassau | 36 min |
| Jul 7, 5:42 PM EDT | Tornado Warning | JAX | Camden | 33 min |
| Jul 7, 6:11 PM EDT | Tornado Warning | JAX | Camden, Glynn, Wayne | 21 min |
| Jul 7, 7:01 PM EDT | Flash Flood Warning | JAX | Camden, Glynn | 119 min |
| Jul 7, 7:53 PM EDT | Flash Flood Warning | JAX | Glynn | 78 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 5.1 hours before the alert went out and 108 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1540 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
982 WWUS20 KWNS 071701 SEL2 SPC WW 071701 FLZ000-GAZ000-CWZ000-080000- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 342 NWS Storm Prediction Center Norman OK 105 PM EDT Wed Jul 7 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northeast Florida Southeast Georgia Coastal Waters * Effective this Wednesday afternoon and evening from 105 PM until 800 PM EDT. * Primary threats include... A couple tornadoes possible SUMMARY...Strong low-level winds on the periphery of Elsa along with a warm/moist air mass will continue to allow for the possibility of transient supercells capable of a couple of brief tornadoes. The tornado watch area is approximately along and 55 statute miles east and west of a line from 35 miles north northwest of Savannah GA to 40 miles west southwest of St Augustine FL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 341... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 14015. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 10:37 PM EDT | Tornado Watch | SPC | Alachua, Charlotte, Citrus, Collier, DeSoto, Gilchrist and 22 more | 9 hr |
| Jul 6, 11:59 PM EDT | Mesoscale Discussion | SPC | Charlotte, DeSoto, Hardee, Hillsborough | 2 hr |
| Jul 7, 3:03 AM EDT | Mesoscale Discussion | SPC | Charlotte, Citrus, DeSoto, Hardee, Hernando, Hillsborough and 5 more | 117 min |
| Jul 7, 5:42 AM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Charlotte, Citrus, Columbia, DeSoto and 19 more | 2 hr |
| Jul 7, 6:46 AM EDT | Tornado Watch | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more | 6 hr |
| Jul 7, 7:06 AM EDT | Mesoscale Discussion | SPC | Charlotte, Citrus, DeSoto, Hardee, Hernando, Highlands and 10 more | 54 min |
| Jul 7, 10:30 AM EDT | Mesoscale Discussion | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 3 more | 2 hr |
| Jul 7, 12:28 PM EDT | Mesoscale Discussion | SPC | Baker, Bradford, Clay, Columbia, Duval, Nassau and 1 more | 2 hr |
| Jul 7, 4:47 PM EDT | Mesoscale Discussion | SPC | Baker, Clay, Columbia, Duval, Nassau, Saint Johns and 1 more | 118 min |
| Jul 7, 6:12 PM EDT | Mesoscale Discussion | SPC | Brantley, Bryan, Camden, Chatham, Effingham, Evans and 6 more | 2 hr |
| Jul 7, 7:25 PM EDT | Tornado Watch | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 11 more | 11 hr |
Nearby
Tornado Watches in Georgia, 2021Tornado Watches in Florida, 2021Every tornado watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.