Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 158
The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2021, 4:58 PM MST for Curry County, Roosevelt County, New Mexico; 27 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 12, 2021, 4:58 PM MST (23:58 UTC)
- Expired
- Mar 12, 2021, 7:00 PM MST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 17
All 29 counties
Curry County, NM, Roosevelt County, NM, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Castro County, TX, Cochran County, TX, Cottle County, TX, Crosby County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hockley County, TX, Kent County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Parmer County, TX, Randall County, TX, Stonewall County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX
The radar
The Lubbock radar (KLBB), 36 km from the middle of the area, began a volume at 00:02 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, 12.0 hours before the alert went out and 157 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
- 66 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 619 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- 345 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
072 ACUS11 KWNS 122359 SWOMCD SPC MCD 122358 TXZ000-NMZ000-130200- Mesoscale Discussion 0158 NWS Storm Prediction Center Norman OK 0558 PM CST Fri Mar 12 2021 Areas affected...Eastern NM...TX South Plains Concerning...Tornado Watch 17... Valid 122358Z - 130200Z The severe weather threat for Tornado Watch 17 continues. SUMMARY...Severe threat continues across ww017. DISCUSSION...Weak surface low is expected to become focused over southeastern NM during the overnight hours in response to upper low, currently over the lower CO River Valley, shifting east across AZ. As a result, easterly low-level component will persist across the southern High Plains assuring modest buoyancy will likely be maintained. Scattered supercells have evolved across this region with one longer-lived storm having already produced a tornado northwest of LBB. Given the moist, unstable profiles noted across this region, additional development is likely, especially if LLJ strengthens after dark as would be expected ahead of the approaching trough. Large hail and isolated tornadoes remain possible until boundary layer cools enough for updrafts to become more elevated. ..Darrow.. 03/12/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OUN...SJT...LUB...AMA...MAF...ABQ... LAT...LON 33040314 35080386 35090050 33069989 33040314
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 2:24 PM MST | Tornado Watch | SPC | Curry, Quay, Roosevelt | 5 hr |
| Mar 12, 12:48 PM MST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Castro, Childress, Collingsworth, Cottle and 15 more | 117 min |
Nearby
Mesoscale Discussions in Texas, 2021Mesoscale Discussions in New Mexico, 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.