Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 247
The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2021, 10:28 PM CDT for Edwards County, Kimble County, Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2021, 10:28 PM CDT (03:28 UTC)
- Expired
- Mar 24, 2021, 11:30 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 49
Counties Edwards County, TX, Kimble County, TX
The radar
The Laughlin AFB radar (KDFX), 116 km from the middle of the area, began a volume at 03:27 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
Del Rio, TX (KDRT), launched 00:00Z, 3.5 hours before the alert went out and 122 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
- 479 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 2767 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 317 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted.
346 ACUS11 KWNS 250328 SWOMCD SPC MCD 250328 TXZ000-250430- Mesoscale Discussion 0247 NWS Storm Prediction Center Norman OK 1028 PM CDT Wed Mar 24 2021 Areas affected...parts of the Edwards Plateau Concerning...Tornado Watch 49... Valid 250328Z - 250430Z The severe weather threat for Tornado Watch 49 continues. SUMMARY...A focused corridor for higher hail potential appears to be maximizing over parts of the Edwards Plateau through 1100-1130pm CDT. Very large hail (2-3 inches in diameter) is possible with the stronger supercells embedded within this thunderstorm cluster. DISCUSSION...MRMS MESH and single site WSR-88D imagery recently showed a very intense supercell over Kimble County, TX with hail potentially 2-3 inches in diameter. This storm has formed on the southern periphery of a cluster of convection near the front draped southwest to northeast. Additional storm development is likely on the southwestern flank as storms break the cap near Val Verde County. The latest RAP forecast sounding for Junction, TX shows strong effective shear (55+ kt) with a 500 mb temperature at -19 deg C---very favorable for supercell hail production. A long hodograph supported by 135 kt 300 mb flow (reference the 02 UTC Junction RAP sounding) will favor ample updraft venting and hail production with the more dominant cells over the next hour. The very large hail threat may gradually wane beyond 1130pm as the convective mode/cell interference lessens the risk. ..Smith.. 03/25/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...EWX...SJT... LAT...LON 30200073 29730079 30409936 31049933 30200073
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 7:37 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 23 more | 53 min |
| Mar 24, 8:15 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Blanco, Bosque, Brown, Burnet and 29 more | 2 hr |
| Mar 24, 9:52 PM CDT | Tornado Watch | SPC | Bandera, Bell, Bexar, Blanco, Bosque, Burnet and 37 more | 6 hr |
| Mar 24, 11:37 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Lamar, Morris, Red River, Titus | 53 min |
| Mar 24, 11:42 PM CDT | Mesoscale Discussion | SPC | Burnet, Coryell, Lampasas, Llano, Mason, San Saba | 93 min |
| Mar 25, 1:40 AM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bell, Bexar, Blanco, Bosque and 40 more | 95 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.