Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 2422

December 9, 2008Little River County, Miller County, Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 38 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2008, 2:17 AM CST for Little River County, Miller County, Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 38 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Dec 9, 2008, 2:17 AM CST (08:17 UTC)
Expired
Dec 9, 2008, 3:15 AM CST
In force
58 min
Issued by
the Storm Prediction Center
All 43 counties

Little River County, AR, Miller County, AR, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bell County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 158 km from the middle of the area, began a volume at 08:19 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 8.3 hours before the alert went out and 160 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, Fort Worth, TX at 00:00Z on 2008-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 259 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, Fort Worth, TX at 00:00Z on 2008-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 307 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
259 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1028 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
307 m²/s²
0-3 km storm-relative helicity
336 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
Dec 8, 11:31 PM CSTTornado WatchSPCLittle River, Miller7 hr
Dec 9, 12:10 AM CSTMesoscale DiscussionSPCBenton, Boone, Carroll, Madison, Marion, Newton and 1 more35 min
Dec 9, 12:22 AM CSTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 24 more4 hr
Dec 9, 1:20 AM CSTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more25 min
Dec 9, 3:41 AM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Clark, Cleveland, Columbia and 36 more64 min
Dec 9, 4:11 AM CSTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more7 hr
Dec 9, 7:41 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more64 min
Dec 9, 9:32 AM CSTTornado WatchSPCAshley, Bradley, Chicot, Desha, Drew, Union6 hr
Dec 9, 10:12 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more93 min
Dec 9, 2:18 PM CSTMesoscale DiscussionSPCChicot87 min
Dec 8, 7:10 PM CSTMesoscale DiscussionSPCBryan, Carter, Love, Marshall2 hr
Dec 8, 9:37 PM CSTSevere Thunderstorm WatchSPCAnderson, Bosque, Camp, Cherokee, Collin, Cooke and 36 more5 hr
Dec 8, 11:14 PM CSTMesoscale DiscussionSPCAnderson, Camp, Delta, Franklin, Freestone, Henderson and 16 more91 min
Dec 9, 2:30 AM CSTMesoscale DiscussionSPCBosque, Collin, Dallas, Grayson30 min
Dec 9, 3:51 PM CSTTornado WatchSPCJasper, Jefferson, Newton, Orange9 hr

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Oklahoma, 2008Mesoscale Discussions in Arkansas, 2008Every mesoscale discussion in 2008

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.