Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 1361

June 20, 200410 counties in Oklahoma; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2004, 8:39 PM CDT for 10 counties in Oklahoma; 18 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 20, 2004, 8:39 PM CDT (01:39 UTC)
Expired: Jun 20, 2004, 10:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Beaver County, OK, Beckham County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harper County, OK, Roger Mills County, OK, Texas County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 127 km from the middle of the area, began a volume at 01:28 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.

Severe Thunderstorm Watch 504Jun 20, 10:35 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.7 hours before the alert went out and 127 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1110 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 2121 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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.

Issued	Product	Office	Counties	Lasted
Jun 20, 9:52 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Ellis, Garfield and 7 more	83 min
Jun 20, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Canadian, Custer, Dewey, Garfield and 10 more	4 hr
Jun 21, 12:59 AM CDT	Mesoscale Discussion	SPC	Craig, Creek, Garfield, Grant, Kay, Kingfisher and 12 more	61 min
Jun 21, 2:00 AM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Creek, Custer, Dewey, Ellis and 15 more	3 hr
Jun 21, 2:25 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Cimarron, Ellis, Greer, Harmon and 5 more	95 min
Jun 21, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron	5 hr
Jun 21, 6:57 PM CDT	Mesoscale Discussion	SPC	Cimarron	93 min
Jun 21, 2:36 PM CDT	Mesoscale Discussion	SPC	Bowie, Callahan, Camp, Cass, Coleman, Collin and 41 more	84 min
Jun 21, 5:21 PM CDT	Mesoscale Discussion	SPC	Brown, Comanche, Eastland, Erath, Hamilton, Mills and 1 more	84 min

Nearby

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