Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 173
The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2021, 8:42 PM CST for 43 counties in Texas. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2021, 8:42 PM CST (02:42 UTC)
- Expired
- Mar 13, 2021, 10:15 PM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 20...21
All 43 counties
Armstrong County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Coke County, TX, Collingsworth County, TX, Cottle County, TX, Crane County, TX, Crockett County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Garza County, TX, Glasscock County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hemphill County, TX, Howard County, TX, Hutchinson County, TX, Irion County, TX, Jones County, TX, Kent County, TX, King County, TX, Lipscomb County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Ochiltree County, TX, Pecos County, TX, Reagan County, TX, Roberts County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Terrell County, TX, Upton County, TX, Wheeler County, TX
The radar
The Lubbock radar (KLBB), 102 km from the middle of the area, began a volume at 02:44 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
Midland Regional, TX (KMAF), launched 00:00Z, 2.7 hours before the alert went out and 119 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
- 3140 m above ground
- 0-6 km bulk shear
- 93 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 380 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
268
ACUS11 KWNS 140242
SWOMCD
SPC MCD 140242
OKZ000-TXZ000-140415-
Mesoscale Discussion 0173
NWS Storm Prediction Center Norman OK
0842 PM CST Sat Mar 13 2021
Areas affected...TX Panhandle...West TX
Concerning...Tornado Watch 20...21...
Valid 140242Z - 140415Z
The severe weather threat for Tornado Watch 20, 21 continues.
SUMMARY...Severe threat appears to be waning a bit across the
southern High Plains.
DISCUSSION...While large-scale forcing is now overspreading the back
edge of convection across the southern High Plains, loss of daytime
heating and the decoupling of the boundary layer appear to be
limiting updraft strength at this time. Additionally, OUN/FWD
exhibited a very strong cap near 700mb suggesting updrafts will
struggle with eastward extent. Recent radar trends support a gradual
weakening and current thinking is a new watch will not be warranted.
..Darrow.. 03/14/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...EWX...SJT...LUB...AMA...MAF...
LAT...LON 30160348 33020147 33010173 36310144 36309983 33030019
33029956 30180163 30160348SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 6:21 PM CST | Mesoscale Discussion | SPC | Borden, Coke, Crane, Crockett, Fisher, Glasscock and 13 more | 114 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.