Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 520

April 30, 2004Lea County, New Mexico; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 5:08 PM MDT for Lea County, New Mexico; 12 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2004, 5:08 PM MDT (23:08 UTC)
Expired: Apr 30, 2004, 6:45 PM MDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Lea County, NM, Bailey County, TX, Borden County, TX, Cochran County, TX, Dawson County, TX, Gaines County, TX, Hockley County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Parmer County, TX, Terry County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 118 km from the middle of the area, began a volume at 23:08 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 12:00Z, 11.1 hours before the alert went out and 204 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: 627 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1710 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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
Apr 29, 7:56 PM MDT	Mesoscale Discussion	SPC	Cottle, Crosby, Dickens, Foard, Garza, Hardeman and 4 more	64 min
Apr 29, 8:28 PM MDT	Mesoscale Discussion	SPC	Cooke, Delta, Denton, Fannin, Grayson, Jack and 3 more	62 min
Apr 29, 9:27 PM MDT	Mesoscale Discussion	SPC	Baylor, Childress, Clay, Collingsworth, Cottle, Foard and 5 more	63 min
Apr 29, 10:05 PM MDT	Severe Thunderstorm Watch	SPC	Cooke, Montague	4 hr
Apr 30, 1:16 AM MDT	Mesoscale Discussion	SPC	Clay, Cooke, Hardeman, Montague, Wichita, Wilbarger	59 min
Apr 30, 11:01 AM MDT	Mesoscale Discussion	SPC	Archer, Baylor, Eastland, Erath, Haskell, Hood and 9 more	119 min
Apr 30, 11:45 AM MDT	Tornado Watch	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 14 more	8 hr
Apr 30, 1:40 PM MDT	Mesoscale Discussion	SPC	Cooke, Denton, Eastland, Erath, Hood, Jack and 6 more	2 hr
Apr 30, 3:41 PM MDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 12 more	94 min
Apr 30, 4:05 PM MDT	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 16 more	5 hr
Apr 30, 4:53 PM MDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 12 more	97 min

Nearby

Mesoscale Discussions in Texas, 2004 Mesoscale Discussions in New Mexico, 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.