Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 168
The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2021, 4:10 PM CST for 4 counties in Texas. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2021, 4:10 PM CST (22:10 UTC)
- Expired
- Mar 13, 2021, 5:15 PM CST
- In force
- 65 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 19
Counties Armstrong County, TX, Carson County, TX, Hutchinson County, TX, Randall County, TX
The radar
The Amarillo radar (KAMA), 19 km from the middle of the area, began a volume at 22:15 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 nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.2 hours before the alert went out and 19 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
- 188 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.9
The text
As transmitted.
642
ACUS11 KWNS 132211
SWOMCD
SPC MCD 132210
TXZ000-132315-
Mesoscale Discussion 0168
NWS Storm Prediction Center Norman OK
0410 PM CST Sat Mar 13 2021
Areas affected...Portions of the Texas Panhandle
Concerning...Tornado Watch 19...
Valid 132210Z - 132315Z
The severe weather threat for Tornado Watch 19 continues.
SUMMARY...Indications are that a significant tornado is ongoing
across Randall County.
DISCUSSION...Radar indicates an intense, cyclic supercell ongoing
across eastern Randall and western Armstrong Counties in Texas
currently. Velocities are suggestive of a significant tornado. A
less intense supercell (with strong rotation aloft) was also located
just south of this storm across Swisher County that also recently
had a reported tornado. The cell resides within an axis of strong
shear/instability with a significant tornado parameter of 4. This
suggests continued potential for significant tornadogenesis over the
next hour or so in downstream areas..
..Cook/Grams.. 03/13/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LUB...AMA...
LAT...LON 35190195 35450182 35890136 35970104 35710076 35130095
34710134 34620182 34770199 35190195SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 8:11 PM CST | Mesoscale Discussion | SPC | Baylor, Briscoe, Childress, Cottle, Crosby, Dickens and 18 more | 64 min |
| Mar 12, 8:38 PM CST | Severe Thunderstorm Watch | SPC | Armstrong, Baylor, Briscoe, Carson, Childress, Cochran and 29 more | 5 hr |
| Mar 12, 11:08 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 26 more | 2 hr |
| Mar 13, 1:06 AM CST | Mesoscale Discussion | SPC | Childress, Cottle, Foard, Hardeman, Motley | 54 min |
| Mar 13, 7:36 AM CST | Mesoscale Discussion | SPC | Dallam, Hartley, Moore, Oldham, Sherman | 2 hr |
| Mar 13, 11:48 AM CST | Mesoscale Discussion | SPC | Bailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 7 more | 117 min |
| Mar 13, 12:36 PM CST | Tornado Watch | SPC | Bailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 8 more | 5 hr |
| Mar 13, 1:52 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 9 more | 113 min |
| Mar 13, 2:26 PM CST | Tornado Watch | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 19 more | 7 hr |
| Mar 13, 2:39 PM CST | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 18 more | 2 hr |
| Mar 13, 3:23 PM CST | Tornado Watch | SPC | Borden, Coke, Crane, Crockett, Dawson, Fisher and 18 more | 6 hr |
| Mar 13, 3:46 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Donley, Floyd, Hale and 5 more | 59 min |
| Mar 13, 5:46 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more | 89 min |
Nearby
Mesoscale Discussions in Texas, 2021Every mesoscale discussion in 2021
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.