Alert archive / Georgia / Tornado Watches in 1999

Tornado Watch 221

May 6, 199919 counties in Alabama; 28 counties in Georgia

The Storm Prediction Center issued this tornado watch at May 6, 1999, 12:30 AM CDT for 19 counties in Alabama; 28 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 6, 1999, 12:30 AM CDT (05:30 UTC)
Expired
May 6, 1999, 6:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 47 counties

Bibb County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Hale County, AL, Jefferson County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Douglas County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Heard County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA

The radar

The Birmingham radar (KBMX), 77 km from the middle of the area, began a volume at 05:31 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 6, 12:57 AM CDTSevere Thunderstorm WarningBMXDeKalb63 min
May 6, 1:15 AM CDTSevere Thunderstorm WarningFFCWalker35 min
May 6, 1:20 AM CDTSevere Thunderstorm WarningFFCCatoosa, Whitfield35 min
May 6, 1:36 AM CDTSevere Thunderstorm WarningBMXJefferson, Walker64 min
May 6, 1:47 AM CDTFlash Flood WarningBMXDeKalb3 hr
May 6, 2:10 AM CDTSevere Thunderstorm WarningFFCMurray35 min
May 6, 2:29 AM CDTSevere Thunderstorm WarningFFCFannin, Gilmer46 min
May 6, 3:10 AM CDTSevere Thunderstorm WarningBMXPerry65 min
May 6, 3:13 AM CDTSevere Thunderstorm WarningFFCFannin, Union32 min
May 6, 3:13 AM CDTSevere Thunderstorm WarningFFCGilmer32 min
May 6, 3:46 AM CDTSevere Thunderstorm WarningBMXSt. Clair49 min
May 6, 4:15 AM CDTSevere Thunderstorm WarningBMXCalhoun50 min
May 6, 4:38 AM CDTSevere Thunderstorm WarningBMXCherokee, Cleburne62 min
May 6, 5:31 AM CDTSevere Thunderstorm WarningBMXClay, Randolph49 min
May 6, 6:00 AM CDTSevere Thunderstorm WarningFFCPaulding35 min

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 5.5 hours before the alert went out and 77 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, Birmingham, AL at 00:00Z on 1999-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1931 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 1999-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 316 square meters per square second.19395878Sfc1 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
1931 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
316 m²/s²
0-3 km storm-relative helicity
395 m²/s²
Significant tornado parameter
3.8
Supercell composite
21.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 8:00 PM CDTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Greene, Jackson and 13 more6 hr
May 6, 5:45 AM CDTTornado WatchSPCAutauga, Barbour, Bullock, Butler, Calhoun, Chambers and 27 more5 hr
May 6, 11:00 AM CDTSevere Thunderstorm WatchSPCBaldwin, Ben Hill, Bibb, Bleckley, Burke, Calhoun and 51 more5 hr
May 6, 2:00 PM CDTSevere Thunderstorm WatchSPCAppling, Bacon, Bryan, Bulloch, Chatham, Effingham and 7 more6 hr

Nearby

Tornado Watches in Georgia, 1999Tornado Watches in Alabama, 1999Every tornado watch in 1999

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.