Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 421
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2012, 6:51 PM CDT for 23 counties in Texas. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 6:51 PM CDT (23:51 UTC)
- Expired
- Apr 2, 2012, 7:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 23 counties
Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Eastland County, TX, Erath County, TX, Foard County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Palo Pinto County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 44 km from the middle of the area, began a volume at 23:54 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
Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 161 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
- 1497 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -170 m²/s²
- 0-3 km storm-relative helicity
- -79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
881
ACUS11 KWNS 022352
SWOMCD
SPC MCD 022351
TXZ000-030045-
MESOSCALE DISCUSSION 0421
NWS STORM PREDICTION CENTER NORMAN OK
0651 PM CDT MON APR 02 2012
AREAS AFFECTED...TX BIG COUNTRY
CONCERNING...SEVERE THUNDERSTORM WATCH 129...
VALID 022351Z - 030045Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 129
CONTINUES.
SEVERE THREAT WILL LIKELY EXTEND S OF THE ORIGINAL WW 129 AND LOCAL
EXTENSION HAS BEEN COORDINATED WITH WFO SJT/FWD. TSTMS WITHIN THIS
REGION SHOULD REMAIN MORE DISCRETE RELATIVE TO FARTHER N IN WW 129
ALONG THE TRAILING INFLUENCE OF THE SHORT WAVE IMPULSE ROTATING NWD
INTO THE TX PANHANDLE. STRONG MID-LEVEL W/SWLYS WILL SUPPORT
EFFECTIVE SHEAR OF 40-50 KT AND PROPAGATION INTO A MORE BUOYANT AIR
MASS FARTHER E WITH ACTIVITY CURRENTLY OCCURRING WITHIN LOWER 50S
SURFACE DEW POINTS. INTENSIFICATION INTO A FEW SUPERCELLS APPEARS
PROBABLE DURING THE EVENING WITH PRIMARY INITIAL RISK OF LARGE HAIL.
..GRAMS.. 04/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...SJT...LUB...
LAT...LON 33989814 32719790 32099806 31629849 31489919 31610007
32630002 33409997 34009997 34109917 33989814SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 5:16 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 13 more | 2 hr |
| Apr 2, 9:57 AM CDT | Mesoscale Discussion | SPC | Angelina, Hardin, Jasper, Nacogdoches, Newton, Orange and 5 more | 63 min |
| Apr 2, 10:10 AM CDT | Severe Thunderstorm Watch | SPC | Angelina, Cherokee, Gregg, Harrison, Jasper, Nacogdoches and 8 more | 7 hr |
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Cherokee, Delta, Fannin and 18 more | 90 min |
| Apr 2, 12:41 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bowie, Camp, Cass, Delta, Fannin and 15 more | 6 hr |
| Apr 2, 3:00 PM CDT | Mesoscale Discussion | SPC | Baylor, Childress, Collingsworth, Foard, Hardeman, Hemphill and 7 more | 2 hr |
| Apr 2, 3:18 PM CDT | Mesoscale Discussion | SPC | Bowie, Delta, Fannin, Franklin, Hopkins, Hunt and 4 more | 117 min |
| Apr 2, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 28 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 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.