Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 427

April 22, 20044 counties in Kentucky; 4 counties in Mississippi; 18 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2004, 9:33 AM CDT for 4 counties in Kentucky; 4 counties in Mississippi; 18 counties in Tennessee. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2004, 9:33 AM CDT (14:33 UTC)
Expired
Apr 22, 2004, 11:30 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 26 counties

Calloway County, KY, Christian County, KY, Todd County, KY, Trigg County, KY, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tippah County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Shelby County, TN, Stewart County, TN, Weakley County, TN

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 2.6 hours before the alert went out and 118 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, Little Rock, AR at 12:00Z on 2004-04-22Temperature 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, Little Rock, AR at 12:00Z on 2004-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -99 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
584 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-99 m²/s²
0-3 km storm-relative helicity
-71 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 12:49 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Bath, Boyle, Breathitt and 39 more2 hr
Apr 21, 7:01 PM CDTMesoscale DiscussionSPCBenton, Coahoma, DeSoto, Lafayette, Marshall, Panola and 3 more119 min
Apr 22, 2:36 PM CDTMesoscale DiscussionSPCCalhoun, Carroll, Chickasaw, Clay, Grenada, Itawamba and 14 more114 min

Nearby

Mesoscale Discussions in Tennessee, 2004Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Mississippi, 2004Every mesoscale discussion in 2004

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.