Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 438
The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 5:00 PM CDT for Little River County, Miller County, Arkansas; 24 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2012, 5:00 PM CDT (22:00 UTC)
- Expired
- Apr 3, 2012, 6:00 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 26 counties
Little River County, AR, Miller County, AR, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Henderson County, TX, Hopkins County, TX, Kaufman County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 134 km from the middle of the area, began a volume at 22:03 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
Shreveport, LA (KSHV), launched 12:00Z, 10.0 hours before the alert went out and 142 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
- 1328 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 475 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 286 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.5
The text
As transmitted, in the capitals the NWS used until 2016.
159
ACUS11 KWNS 032201
SWOMCD
SPC MCD 032200
ARZ000-LAZ000-TXZ000-OKZ000-032300-
MESOSCALE DISCUSSION 0438
NWS STORM PREDICTION CENTER NORMAN OK
0500 PM CDT TUE APR 03 2012
AREAS AFFECTED...NERN/E-CNTRL TX...FAR SERN OK/SWRN AR
CONCERNING...TORNADO WATCH 133...135...
VALID 032200Z - 032300Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 133...135...CONTINUES.
PRIMARY TORNADO RISK WILL REMAIN WITH SEMI-DISCRETE SUPERCELLS
PERSISTING ALONG REMNANT OUTFLOW BOUNDARY OVER FAR NERN TX AND
PERHAPS DEVELOPING INTO EXTREME SERN OK/SWRN AR. MESOCYCLONE
CIRCULATIONS HAVE BEEN IN W/E-ORIENTED CONVECTION ACROSS FAR NERN TX
AND ALONG THE NRN PORTION OF A QLCS THAT EXTENDED FROM 30 W PRX TO
20 S ACT AS OF 2145Z...IN AN ENVIRONMENT CHARACTERIZED BY 0-1 KM
SHEAR AROUND 20-25 KT. ADDITIONAL PRE-FRONTAL TSTM DEVELOPMENT IS
POSSIBLE AND SHOULD MAINTAIN A CONTINUED TORNADO RISK FOR THE NEXT
FEW HOURS. LOW-LEVEL SHEAR IS WEAKER WITH S/SWRN EXTENT ALONG THE
QLCS PER THE GRK VWP AND GIVEN THE UNDERCUTTING NATURE OF THE
COMPOSITE COLD FRONT/OUTFLOW...LIKELY MITIGATE THE TORNADO THREAT
RELATIVE TO THE RED RIVER VICINITY.
..GRAMS.. 04/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...HGX...FWD...
LAT...LON 33699553 33889508 33889475 33859424 33519368 33209369
32979374 32789399 32439457 31919518 31229599 31239670
31269704 31749686 32809623 33409592 33699553SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 1:42 PM CDT | Mesoscale Discussion | SPC | Chicot | 93 min |
| Apr 3, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Lafayette, Nevada, Union | 8 hr |
| Apr 3, 2:36 PM CDT | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 7 hr |
| Apr 3, 3:05 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Little River, Montgomery, Nevada, Pike and 2 more | 85 min |
| Apr 3, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bradley, Calhoun, Clark, Crawford, Dallas and 16 more | 6 hr |
| Apr 3, 5:24 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Union | 66 min |
| Apr 3, 6:53 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 67 min |
| Apr 2, 7:17 PM CDT | Mesoscale Discussion | SPC | Hansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts | 58 min |
| Apr 2, 9:12 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Hardeman, Haskell, Hemphill and 12 more | 63 min |
| Apr 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Jack, Montague, Wichita and 2 more | 5 hr |
| Apr 2, 11:45 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more | 2 hr |
| Apr 3, 1:14 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Clay, Jack, Montague and 7 more | 2 hr |
| Apr 3, 3:32 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Brown, Callahan, Clay and 24 more | 88 min |
| Apr 3, 8:36 AM CDT | Mesoscale Discussion | SPC | Archer, Bell, Blanco, Bosque, Brown, Burnet and 40 more | 84 min |
| Apr 3, 9:18 AM CDT | Severe Thunderstorm Watch | SPC | Bosque, Clay, Collin, Comanche, Cooke, Coryell and 33 more | 8 hr |
| Apr 3, 11:47 AM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Cooke, Coryell, Dallas, Delta and 32 more | 118 min |
| Apr 3, 12:08 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more | 9 hr |
| Apr 3, 1:12 PM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Dallas, Denton, Ellis, Erath and 16 more | 93 min |
| Apr 3, 1:46 PM CDT | Mesoscale Discussion | SPC | Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 9 more | 89 min |
| Apr 3, 2:21 PM CDT | Mesoscale Discussion | SPC | Lamar, Montague | 84 min |
| Apr 3, 4:38 PM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more | 67 min |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Arkansas, 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.