Alert archive / Alabama / Tornado Watches in 1999

Tornado Watch 157

April 15, 199930 counties in Alabama; Greene County, Mississippi

The Storm Prediction Center issued this tornado watch at Apr 15, 1999, 12:00 AM CDT for 30 counties in Alabama; Greene County, Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 15, 1999, 12:00 AM CDT (05:00 UTC)
Expired
Apr 15, 1999, 6:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 31 counties

Autauga County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Hale County, AL, Jefferson County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Greene County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 15, 12:09 AM CDTSevere Thunderstorm WarningMOBChoctaw66 min
Apr 15, 12:22 AM CDTTornado WarningMOBChoctaw68 min
Apr 15, 12:54 AM CDTSevere Thunderstorm WarningBMXGreene, Hale51 min
Apr 15, 1:11 AM CDTSevere Thunderstorm WarningMOBGreene, Perry79 min
Apr 15, 1:19 AM CDTTornado WarningMOBClarke71 min
Apr 15, 1:36 AM CDTTornado WarningBMXMarengo49 min
Apr 15, 1:42 AM CDTSevere Thunderstorm WarningMOBWashington78 min
Apr 15, 2:05 AM CDTSevere Thunderstorm WarningBMXJefferson35 min
Apr 15, 2:07 AM CDTTornado WarningMOBWilcox68 min
Apr 15, 2:26 AM CDTTornado WarningBMXDallas49 min
Apr 15, 2:27 AM CDTSevere Thunderstorm WarningMOBClarke78 min
Apr 15, 2:47 AM CDTSevere Thunderstorm WarningMOBMonroe73 min
Apr 15, 3:09 AM CDTSevere Thunderstorm WarningBMXAutauga51 min
Apr 15, 3:14 AM CDTTornado WarningBMXDallas31 min
Apr 15, 3:15 AM CDTSevere Thunderstorm WarningMOBWilcox60 min
Apr 15, 3:20 AM CDTTornado WarningBMXLowndes60 min
Apr 15, 3:28 AM CDTSevere Thunderstorm WarningMOBButler, Conecuh62 min
Apr 15, 3:41 AM CDTSevere Thunderstorm WarningBMXTalladega34 min
Apr 15, 3:58 AM CDTSevere Thunderstorm WarningBMXMontgomery47 min
Apr 15, 4:47 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw58 min

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 5.0 hours before the alert went out and 136 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 1999-04-15Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 1999-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 264 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2269 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
264 m²/s²
0-3 km storm-relative helicity
501 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 14, 10:00 PM CDTTornado WatchSPCColbert, Fayette, Franklin, Greene, Lamar, Lauderdale and 6 more6 hr
Apr 15, 6:30 AM CDTTornado WatchSPCBarbour, Coffee, Dale, Geneva, Henry, Houston6 hr

Nearby

Tornado Watches in Alabama, 1999Tornado Watches in Mississippi, 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.