Alert archive / Georgia / Tornado Watches in 2021

Tornado Watch 52

March 25, 202147 counties in Georgia

The Storm Prediction Center issued this tornado watch at Mar 25, 2021, 7:46 PM EDT for 47 counties in Georgia. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Mar 25, 2021, 7:46 PM EDT (23:46 UTC)
Expired
Mar 26, 2021, 3:42 AM EDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 47 counties

Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Meriwether County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Rockdale County, GA, Spalding County, GA, Troup County, GA, Union County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA

The radar

The Atlanta radar (KFFC), 91 km from the middle of the area, began a volume at 23:50 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
50%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
50%

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Mar 25, 8:49 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee, Cobb, Haralson, Paulding, Polk41 min
Mar 25, 9:05 PM EDTFlash Flood WarningFFCBartow, Cherokee, Dawson, Gilmer, Gordon, Pickens6 hr
Mar 25, 9:25 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee, Forsyth, Fulton38 min
Mar 25, 10:36 PM EDTSevere Thunderstorm WarningFFCCatoosa, Chattooga, Walker, Whitfield24 min
Mar 25, 11:13 PM EDTTornado Warning Tornado observedFFCHeard47 min
Mar 25, 11:43 PM EDTTornado Warning EmergencyFFCCoweta, Heard32 min
Mar 25, 11:50 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee25 min
Mar 26, 12:10 AM EDTTornado Warning EmergencyTornado observedCatastrophic damage threatFFCClayton, Coweta, Fayette, Fulton35 min
Mar 26, 12:14 AM EDTTornado Warning EmergencyTornado observedCatastrophic damage threatFFCCoweta9 min
Mar 26, 1:06 AM EDTFlash Flood WarningFFCDawson, Lumpkin, White5 hr
Mar 26, 2:38 AM EDTSevere Thunderstorm WarningFFCDeKalb, Fulton, Gwinnett37 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.8 hours before the alert went out and 87 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.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2021-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2021-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 397 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1602 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
397 m²/s²
0-3 km storm-relative helicity
647 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

928 
WWUS20 KWNS 252343
SEL2  
SPC WW 252343
GAZ000-260600-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 52
NWS Storm Prediction Center Norman OK
745 PM EDT Thu Mar 25 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  West-central and north Georgia

* Effective this Thursday night and Friday morning from 745 PM
  until 200 AM EDT.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Clusters with embedded supercells should progress
east-northeast from northwest Georgia and east-central Alabama.
Primary threat will be tornadoes, particularly near the surface warm
front in north Georgia and with any semi-discrete supercells
progressing into west-central Georgia.

The tornado watch area is approximately along and 40 statute miles
east and west of a line from 95 miles north northeast of Atlanta GA
to 15 miles southeast of La Grange GA. 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 50...WW 51...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 23040.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 24, 10:25 PM EDTMesoscale DiscussionSPCBaldwin, Mobile, Washington65 min
Mar 25, 10:02 AM EDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 21 more118 min
Mar 25, 11:12 AM EDTMesoscale DiscussionSPCBibb, Blount, Colbert, Cullman, DeKalb, Etowah and 22 more3 hr
Mar 25, 11:58 AM EDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lawrence, Marion and 2 more3 hr
Mar 25, 12:26 PM EDTTornado Watch PDSSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 39 more9 hr
Mar 25, 1:28 PM EDTMesoscale DiscussionSPCBibb, Calhoun, Clay, Cleburne, Shelby, Talladega2 hr
Mar 25, 2:24 PM EDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Greene, Lamar, Lawrence and 4 more2 hr
Mar 25, 4:45 PM EDTMesoscale DiscussionSPCBibb, Chilton, Choctaw, Dallas, Greene, Hale and 8 more2 hr
Mar 25, 5:45 PM EDTMesoscale DiscussionSPCBibb, Chilton, Coosa, Perry, Shelby, Talladega60 min
Mar 25, 6:45 PM EDTMesoscale DiscussionSPCClay, Randolph60 min
Mar 25, 5:31 PM EDTMesoscale DiscussionSPCBanks, Catoosa, Cherokee, Dawson, Fannin, Forsyth and 13 more119 min

Nearby

Tornado Watches in Georgia, 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.