Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 311

April 9, 200411 counties in Arkansas; Bryan County, Choctaw County, Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2004, 10:06 PM CDT for 11 counties in Arkansas; Bryan County, Choctaw County, Oklahoma; 4 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2004, 10:06 PM CDT (03:06 UTC)
Expired
Apr 9, 2004, 11:00 PM CDT
In force
54 min
Issued by
the Storm Prediction Center

Counties Clark County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Little River County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Bryan County, OK, Choctaw County, OK, Delta County, TX, Fannin County, TX, Lamar County, TX, Red River County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 3.1 hours before the alert went out and 200 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, Shreveport, LA at 00:00Z on 2004-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 350 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, Shreveport, LA at 00:00Z on 2004-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
350 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1945 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 9, 7:02 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Garland, Hempstead, Howard, Johnson and 9 more58 min
Apr 9, 7:40 PM CDTSevere Thunderstorm WatchSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 10 more5 hr
Apr 9, 11:57 PM CDTMesoscale DiscussionSPCHempstead, Little River, Nevada, Sevier63 min
Apr 10, 5:57 AM CDTMesoscale DiscussionSPCHoward, Little River, Pike, Polk, Scott, Sebastian and 1 more93 min
Apr 10, 2:50 PM CDTMesoscale DiscussionSPCAshley, Chicot, Columbia, Lafayette, Miller, Union115 min
Apr 10, 3:25 PM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Desha and 5 more6 hr
Apr 9, 9:25 PM CDTMesoscale DiscussionSPCBeckham, Comanche, Greer, Harmon, Jackson, Kiowa and 2 more95 min
Apr 10, 9:08 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 21 more2 hr
Apr 10, 10:20 AM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 33 more6 hr
Apr 10, 12:43 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Bexar, Blanco, Burleson and 26 more2 hr
Apr 10, 2:50 PM CDTSevere Thunderstorm WatchSPCAtascosa, Austin, Bandera, Bastrop, Bee, Bexar and 52 more5 hr
Apr 10, 5:38 PM CDTMesoscale DiscussionSPCHardin, Jasper, Jefferson, Newton, Orange, Tyler2 hr
Apr 10, 6:09 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bee, Brazoria, Colorado, DeWitt and 17 more96 min
Apr 10, 6:30 PM CDTSevere Thunderstorm WatchSPCJasper, Jefferson, Newton, Orange5 hr

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Oklahoma, 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.