Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 481
The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2012, 5:37 PM CDT for 8 counties in Oklahoma; 28 counties in Texas. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2012, 5:37 PM CDT (22:37 UTC)
- Expired
- Apr 9, 2012, 7:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 36 counties
Beckham County, OK, Custer County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Washita County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Hockley County, TX, King County, TX, Knox County, TX, Lamb County, TX, Lubbock County, TX, Motley County, TX, Randall County, TX, Swisher County, TX, Wheeler County, TX, Wilbarger County, TX
The radar
The Amarillo radar (KAMA), 107 km from the middle of the area, began a volume at 22:40 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, 10.6 hours before the alert went out and 106 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
- 505 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 1025 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
663 ACUS11 KWNS 092238 SWOMCD SPC MCD 092237 OKZ000-TXZ000-NMZ000-100000- MESOSCALE DISCUSSION 0481 NWS STORM PREDICTION CENTER NORMAN OK 0537 PM CDT MON APR 09 2012 AREAS AFFECTED...NWRN TX...SWRN OK CONCERNING...SEVERE THUNDERSTORM WATCH 152... VALID 092237Z - 100000Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 152 CONTINUES. MULTIPLE THUNDERSTORM UPDRAFTS ARE BEGINNING TO MERGE ACROSS THE ERN TX PANHANDLE AND AN MCS SHOULD EVOLVE OVER THE NEXT FEW HOURS. LATEST RADAR DATA SUGGESTS INDIVIDUAL STORM CELLS ARE MOVING SEWD AT ROUGHLY 15KT BUT OVERALL SPEED MAY GRADUALLY INCREASE AS MCS MATURES AND PRECIP OUTFLOW BECOMES MORE ORGANIZED. GIVEN THESE TRENDS IT WOULD APPEAR LIKELY THAT A SLOW MOVING COMPLEX OF STORMS WILL SPREAD ACROSS SWRN OK BETWEEN 00-03Z. LARGE HAIL CAN BE EXPECTED WITH THE STRONGEST UPDRAFTS. ..DARROW.. 04/09/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OUN...LUB...AMA...MAF... LAT...LON 33490306 35830162 35839804 33499959 33490306
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 1:54 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Blaine, Custer, Dewey, Ellis and 7 more | 96 min |
| Apr 9, 2:28 PM CDT | Tornado Watch | SPC | Alfalfa, Blaine, Dewey, Ellis, Harper, Major and 2 more | 5 hr |
| Apr 9, 3:06 PM CDT | Mesoscale Discussion | SPC | Beckham, Greer, Harmon, Jackson, Kiowa, Roger Mills and 1 more | 54 min |
| Apr 9, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Caddo, Comanche, Custer, Greer, Harmon and 5 more | 8 hr |
| Apr 9, 6:27 PM CDT | Tornado Watch | SPC | Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 11 more | 8 hr |
| Apr 9, 5:03 PM CDT | Mesoscale Discussion | SPC | Andrews, Crane, Dawson, Ector, Gaines, Jeff Davis and 9 more | 87 min |
| Apr 9, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Brewster, Crane, Crockett, Culberson, Dawson and 18 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 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.