Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 585

April 18, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2005, 5:55 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 18, 2005, 5:55 PM CDT (22:55 UTC)
Expired: Apr 18, 2005, 8:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 43 counties

Clark County, KS, Ford County, KS, Grant County, KS, Gray County, KS, Haskell County, KS, Kearny County, KS, Meade County, KS, Morton County, KS, Seward County, KS, Stevens County, KS, Lea County, NM, Beaver County, OK, Texas County, OK, Andrews County, TX, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Deaf Smith County, TX, Donley County, TX, Floyd County, TX, Gaines County, TX, Gray County, TX, Hale County, TX, Hansford County, TX, Hutchinson County, TX, Lamb County, TX, Lipscomb County, TX, Loving County, TX, Moore County, TX, Ochiltree County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Reeves County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Ward County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Amarillo radar (KAMA), 57 km from the middle of the area, began a volume at 22:58 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.9 hours before the alert went out and 57 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: 59 J/kg
Mixed-layer CIN: -319 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 237 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.

Issued	Product	Office	Counties	Lasted
Apr 17, 9:18 PM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Edwards, Finney, Ford, Grant and 17 more	87 min
Apr 18, 12:08 PM CDT	Mesoscale Discussion	SPC	Marshall, Nemaha, Washington	2 hr
Apr 18, 2:09 PM CDT	Mesoscale Discussion	SPC	Haskell, Morton, Seward, Stevens	2 hr
Apr 18, 3:10 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Ford, Grant, Gray, Haskell, Meade and 3 more	7 hr
Apr 18, 5:56 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Logan, Rawlins, Sherman, Thomas, Wallace	3 hr
Apr 17, 9:40 PM CDT	Mesoscale Discussion	SPC	Chaves, Curry, De Baca, Eddy, Guadalupe, Lea and 2 more	95 min
Apr 18, 6:43 PM CDT	Mesoscale Discussion	SPC	Greer, Harmon, Jackson	62 min

Nearby

Mesoscale Discussions in Texas, 2005 Mesoscale Discussions in Kansas, 2005 Mesoscale Discussions in Oklahoma, 2005 Every mesoscale discussion in 2005

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.