Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 537

April 23, 2003Harmon County, Oklahoma; 31 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2003, 2:58 AM CDT for Harmon County, Oklahoma; 31 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2003, 2:58 AM CDT (07:58 UTC)
Expired
Apr 23, 2003, 5:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 32 counties

Harmon County, OK, Armstrong County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Coke County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX

The radar

The Lubbock radar (KLBB), 87 km from the middle of the area, began a volume at 08:02 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

Midland Regional, TX (KMAF), launched 00:00Z, 8.0 hours before the alert went out and 192 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, Midland Regional, TX at 00:00Z on 2003-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1643 joules per kilogram.LCLEL10008507005003002001001 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, Midland Regional, TX at 00:00Z on 2003-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
1643 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1969 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
233 m²/s²
Significant tornado parameter
0.1
Supercell composite
12.1

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
Apr 23, 9:55 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 17 more65 min
Apr 23, 10:30 AM CDTMesoscale DiscussionSPCBeckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more90 min
Apr 23, 11:50 AM CDTTornado WatchSPCComanche, Cotton, Harmon, Jackson, Tillman6 hr
Apr 23, 1:20 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more6 hr
Apr 23, 1:26 PM CDTMesoscale DiscussionSPCComanche, Cotton, Harmon, Jackson, Tillman94 min
Apr 23, 2:44 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more91 min
Apr 23, 3:08 PM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Garvin, Jackson, Jefferson and 5 more97 min
Apr 23, 4:00 PM CDTTornado WatchSPCAtoka, Bryan, Carter, Jefferson, Johnston, Love and 3 more6 hr
Apr 23, 5:36 PM CDTMesoscale DiscussionSPCCotton, Tillman54 min
Apr 23, 5:47 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 16 more88 min
Apr 23, 6:00 PM CDTTornado WatchSPCComanche, Cotton, Stephens, Tillman4 hr
Apr 22, 7:32 PM CDTMesoscale DiscussionSPCGaines, Martin88 min
Apr 23, 12:04 AM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 27 more116 min
Apr 23, 1:05 AM CDTSevere Thunderstorm WatchSPCBailey, Castro, Cochran, Dallam, Deaf Smith, Hartley and 10 more6 hr
Apr 23, 3:59 AM CDTMesoscale DiscussionSPCBailey, Castro, Cochran, Deaf Smith, Hale, Hartley and 13 more2 hr
Apr 23, 2:12 PM CDTMesoscale DiscussionSPCBandera, Crockett, Edwards, Kerr, Kimble, Kinney and 7 more93 min
Apr 23, 2:35 PM CDTSevere Thunderstorm WatchSPCCrockett, Edwards, Kimble, Kinney, Mason, Menard and 4 more5 hr
Apr 23, 4:02 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Kimble, Kinney, Mason, Menard and 5 more88 min

Nearby

Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Oklahoma, 2003Every mesoscale discussion in 2003

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.