Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 1793
The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2012, 2:40 PM MDT for 11 counties in New Mexico; 27 counties in Texas. It was in force for 35 min.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2012, 2:40 PM MDT (20:40 UTC)
- Expired
- Aug 20, 2012, 3:15 PM MDT
- In force
- 35 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 38 counties
Chaves County, NM, Curry County, NM, De Baca County, NM, Eddy County, NM, Guadalupe County, NM, Harding County, NM, Lea County, NM, Quay County, NM, Roosevelt County, NM, San Miguel County, NM, Union County, NM, Andrews County, TX, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Dallam County, TX, Dawson County, TX, Deaf Smith County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hartley County, TX, Hockley County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Moore County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX
The radar
The Cannon AFB radar (KFDX), 59 km from the middle of the area, began a volume at 20:40 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, 8.7 hours before the alert went out and 191 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2358 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 419 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 2:59 PM MDT | Severe Thunderstorm Watch | SPC | Chaves, Curry, De Baca, Eddy, Guadalupe, Harding and 5 more | 7 hr |
| Aug 20, 5:04 PM MDT | Mesoscale Discussion | SPC | Curry, De Baca, Lea, Quay, Roosevelt | 116 min |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in New Mexico, 2012Every mesoscale discussion in 2012
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.