Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 442

March 17, 20089 counties in Arkansas; 4 counties in Oklahoma; 27 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2008, 5:30 PM CDT for 9 counties in Arkansas; 4 counties in Oklahoma; 27 counties in Texas. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
Mar 17, 2008, 5:30 PM CDT (22:30 UTC)
Expired
Mar 17, 2008, 6:00 PM CDT
In force
30 min
Issued by
the Storm Prediction Center
All 40 counties

Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Choctaw County, OK, Latimer County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Ellis County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River 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 Shreveport radar (KSHV), 156 km from the middle of the area, began a volume at 22:33 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 12:00Z, 10.5 hours before the alert went out and 203 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 12:00Z on 2008-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 185 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 12:00Z on 2008-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 338 square meters per square second.1939587897117Sfc1 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
185 J/kg
Mixed-layer CIN
-428 J/kg
Mixed-layer LCL
651 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
338 m²/s²
0-3 km storm-relative helicity
576 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
Mar 17, 5:50 PM CDTTornado WatchSPCClark, Garland, Hempstead, Hot Spring, Howard, Little River and 11 more5 hr
Mar 16, 11:49 PM CDTMesoscale DiscussionSPCHarmon56 min
Mar 17, 2:53 AM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Comanche, Cotton and 17 more2 hr
Mar 17, 3:25 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 34 more8 hr
Mar 17, 4:01 AM CDTMesoscale DiscussionSPCBeaver, Harper, Texas119 min
Mar 17, 5:41 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 23 more94 min
Mar 17, 7:37 AM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more83 min
Mar 17, 10:25 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more65 min
Mar 17, 1:02 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Jackson, Jefferson, Kiowa and 3 more88 min
Mar 17, 1:30 PM CDTSevere Thunderstorm WatchSPCBlaine, Caddo, Canadian, Comanche, Cotton, Custer and 9 more6 hr
Mar 17, 3:53 PM CDTMesoscale DiscussionSPCCanadian, Carter, Cleveland, Comanche, Cotton, Garvin and 11 more97 min
Mar 17, 4:51 PM CDTMesoscale DiscussionSPCCleveland, Creek, Kay, Lincoln, Logan, McClain and 12 more24 min
Mar 17, 6:20 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 14 more25 min
Mar 17, 12:04 AM CDTSevere Thunderstorm WatchSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 38 more9 hr
Mar 17, 10:13 AM CDTMesoscale DiscussionSPCBandera, Bell, Bexar, Blanco, Bosque, Brown and 39 more92 min
Mar 17, 6:40 PM CDTTornado WatchSPCBandera, Blanco, Bosque, Brown, Burnet, Callahan and 54 more7 hr

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Oklahoma, 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.