Alert archive / Georgia / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 289

May 22, 201213 counties in Florida; 24 counties in Georgia

The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2012, 3:43 PM CDT for 13 counties in Florida; 24 counties in Georgia. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2012, 3:43 PM CDT (20:43 UTC)
Expired
May 22, 2012, 8:00 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 37 counties

Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 81 km from the middle of the area, began a volume at 20:43 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
10%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 22, 3:45 PM CDTSevere Thunderstorm WarningTAEBaker, Calhoun, Dougherty, Mitchell45 min
May 22, 3:52 PM CDTSevere Thunderstorm WarningTAEGadsden, Leon, Liberty, Wakulla38 min
May 22, 4:18 PM CDTSevere Thunderstorm WarningTAEDecatur27 min
May 22, 4:23 PM CDTSevere Thunderstorm WarningTAEWakulla37 min
May 22, 4:23 PM CDTSevere Thunderstorm WarningTAEColquitt, Dougherty, Mitchell, Worth37 min
May 22, 4:40 PM CDTSevere Thunderstorm WarningTAEDecatur, Mitchell35 min
May 22, 4:49 PM CDTSevere Thunderstorm WarningTAEMitchell26 min
May 22, 4:57 PM CDTSevere Thunderstorm WarningTAEWakulla33 min
May 22, 4:57 PM CDTSevere Thunderstorm WarningTAEGrady, Mitchell29 min
May 22, 4:58 PM CDTSevere Thunderstorm WarningTAEBerrien, Colquitt, Cook, Tift, Worth47 min
May 22, 5:07 PM CDTSevere Thunderstorm WarningTAEColquitt, Mitchell, Worth38 min
May 22, 5:23 PM CDTSevere Thunderstorm WarningTAEBaker, Mitchell24 min
May 22, 5:34 PM CDTSevere Thunderstorm WarningTAECalhoun, Jackson, Liberty11 min
May 22, 5:37 PM CDTSevere Thunderstorm WarningTAEBerrien, Colquitt, Cook, Lanier, Tift53 min
May 22, 6:14 PM CDTSevere Thunderstorm WarningTAEBerrien, Lanier46 min
May 22, 6:44 PM CDTSevere Thunderstorm WarningTAEBerrien, Lanier, Lowndes21 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.7 hours before the alert went out and 81 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, Tallahassee Rgnl, FL at 12:00Z on 2012-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 78 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2012-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.1939Sfc1 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
78 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1278 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 12:10 PM CDTMesoscale DiscussionSPCBroward, Collier, Glades, Hendry, Martin, Miami-Dade and 4 more2 hr
May 22, 12:46 PM CDTMesoscale DiscussionSPCHamilton59 min
May 22, 2:32 PM CDTSevere Thunderstorm WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more5 hr
May 22, 5:58 PM CDTMesoscale DiscussionSPCChatham62 min

Nearby

Severe Thunderstorm Watches in Georgia, 2012Severe Thunderstorm Watches in Florida, 2012Every severe thunderstorm watch in 2012

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.