Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 205, NWS Mobile, AL

October 18, 2012Choctaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Oct 18, 2012, 1:56 AM CDT for Choctaw County, Alabama. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 18, 2012, 1:56 AM CDT (06:56 UTC)
Expired
Oct 18, 2012, 2:45 AM CDT
In force
49 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 149 km from the middle of the area, began a volume at 06:57 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.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 6.9 hours before the alert went out and 174 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, Jackson, MS at 00:00Z on 2012-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 229 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, Jackson, MS at 00:00Z on 2012-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 157 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
229 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
157 m²/s²
0-3 km storm-relative helicity
316 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 18, 2:39 AM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke51 min
Oct 18, 3:11 AM CDTAreal Flood AdvisoryMOBChoctaw2 hr
Oct 18, 4:59 AM CDTAreal Flood AdvisoryMOBClarke2 hr
Oct 18, 8:23 AM CDTSpecial Marine WarningMOB97 min
Oct 18, 10:19 AM CDTSpecial Marine WarningMOB41 min
Oct 18, 11:01 AM CDTSpecial Marine WarningMOB51 min
Oct 18, 2:28 PM CDTFire Weather WatchMOBButler, Conecuh, Covington, Crenshaw, Escambia15 hr
Oct 18, 5:55 AM CDTFire Weather WatchMOB9 hr
Oct 18, 10:53 AM CDTTornado WarningMOBOkaloosa17 min
Oct 18, 2:28 PM CDTRed Flag WarningMOB29 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2012Every severe thunderstorm warning 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.