Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 1957

August 11, 200426 counties in Arkansas; 13 counties in Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2004, 6:49 AM CDT for 26 counties in Arkansas; 13 counties in Oklahoma; 5 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Aug 11, 2004, 6:49 AM CDT (11:49 UTC)
Expired
Aug 11, 2004, 8:45 AM CDT
In force
116 min
Issued by
the Storm Prediction Center
All 44 counties

Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Fannin County, TX, Lamar County, TX, Red River County, TX, Titus County, TX

The radar

The Western Arkansas radar (KSRX), 121 km from the middle of the area, began a volume at 11:51 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

Norman, OK (KOUN), launched 00:00Z, 11.8 hours before the alert went out and 243 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, Norman, OK at 00:00Z on 2004-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1974 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, Norman, OK at 00:00Z on 2004-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 square meters per square second.193958Sfc1 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
1974 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
1562 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Aug 11, 1:07 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 30 more113 min
Aug 11, 1:35 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 37 more5 hr
Aug 11, 5:23 AM CDTMesoscale DiscussionSPCBenton, Carroll, Cleburne, Conway, Craighead, Crawford and 27 more97 min
Aug 11, 12:22 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Desha and 4 more2 hr
Aug 10, 9:15 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Cleveland, Creek, Dewey and 23 more60 min
Aug 10, 9:30 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Canadian, Creek, Dewey, Ellis and 20 more7 hr
Aug 10, 10:16 PM CDTMesoscale DiscussionSPCBeaver, Texas59 min
Aug 10, 11:30 PM CDTSevere Thunderstorm WatchSPCBeaver, Ellis, Harper, Texas5 hr
Aug 10, 11:43 PM CDTMesoscale DiscussionSPCBlaine, Canadian, Creek, Custer, Dewey, Garfield and 10 more62 min
Aug 11, 1:05 AM CDTSevere Thunderstorm WatchSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 34 more6 hr
Aug 11, 2:42 AM CDTMesoscale DiscussionSPCAlfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 49 more2 hr
Aug 11, 1:16 PM CDTMesoscale DiscussionSPCAnderson, Austin, Bandera, Bastrop, Bell, Bexar and 44 more2 hr

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Texas, 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; radar from the NEXRAD Level II archive.