Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 525

April 21, 20075 states

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2007, 1:44 PM MDT for 5 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2007, 1:44 PM MDT (19:44 UTC)
Expired: Apr 21, 2007, 3:15 PM MDT
In force: 91 min
Issued by: the Storm Prediction Center

All 32 counties

Baca County, CO, Bent County, CO, Cheyenne County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Prowers County, CO, Cheyenne County, KS, Greeley County, KS, Hamilton County, KS, Morton County, KS, Sherman County, KS, Stanton County, KS, Wallace County, KS, Curry County, NM, Quay County, NM, Roosevelt County, NM, Union County, NM, Cimarron County, OK, Bailey County, TX, Castro County, TX, Cochran County, TX, Dallam County, TX, Deaf Smith County, TX, Hartley County, TX, Lamb County, TX, Moore County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 202 km from the middle of the area, began a volume at 19:42 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.7 hours before the alert went out and 202 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: 516 J/kg
Mixed-layer CIN: -318 J/kg
Mixed-layer LCL: 788 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 21, 12:35 PM MDT	Mesoscale Discussion	SPC	Sedgwick	55 min
Apr 21, 12:57 PM MDT	Tornado Watch	SPC	Phillips, Sedgwick	9 hr
Apr 21, 2:10 PM MDT	Tornado Watch	SPC	Baca, Bent, Cheyenne, Kiowa, Kit Carson, Prowers and 1 more	7 hr
Apr 21, 4:57 PM MDT	Mesoscale Discussion	SPC	Phillips, Sedgwick	2 hr
Apr 21, 5:10 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Kiowa, Kit Carson, Prowers and 1 more	2 hr
Apr 21, 5:11 AM MDT	Mesoscale Discussion	SPC	Decatur, Finney, Gove, Grant, Gray, Haskell and 11 more	2 hr
Apr 21, 2:44 PM MDT	Tornado Watch PDS	SPC	Beaver, Cimarron, Texas	8 hr
Apr 21, 4:32 PM MDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Texas	118 min
Apr 21, 5:49 PM MDT	Mesoscale Discussion	SPC	Crane, Crockett, Ector, Glasscock, Irion, Midland and 6 more	116 min

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Colorado, 2007 Mesoscale Discussions in Kansas, 2007 Every mesoscale discussion in 2007

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.