Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 243
The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2021, 6:10 PM CDT for 37 counties in Texas. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2021, 6:10 PM CDT (23:10 UTC)
- Expired
- Mar 24, 2021, 7:15 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 47
All 37 counties
Bell County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Dallas County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Gillespie County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Johnson County, TX, Kaufman County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Navarro County, TX, Rains County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 115 km from the middle of the area, began a volume at 23:13 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
Fort Worth, TX (KFWD), launched 12:00Z, 11.2 hours before the alert went out and 153 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
- 1705 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
543
ACUS11 KWNS 242310
SWOMCD
SPC MCD 242310
TXZ000-250015-
Mesoscale Discussion 0243
NWS Storm Prediction Center Norman OK
0610 PM CDT Wed Mar 24 2021
Areas affected...portions of central and north-central Texas
Concerning...Tornado Watch 47...
Valid 242310Z - 250015Z
The severe weather threat for Tornado Watch 47 continues.
SUMMARY...The severe threat continues across WW 47.
DISCUSSION...Scattered cellular convection, including a few
supercells, have evolved near/just east of the DFW metro area over
the past hour. Additionally, a longer-lived supercell over San
Saba/Mills/Hamilton counties has recently produced 1.5-1.75 inch
hail. Additional shallow convection has deepened in the past 15
minutes along the I-35 corridor between Waco and Hillsboro. The
storms are in a favorable environment for updraft rotation, with
southeasterly low-level flow veering strongly with height amid weak
to moderate instability. Additionally, the cells just east of DFW
appear to be interacting favorably with a warm front lifting
northward along the I-20 corridor in that area. As gradual
low-level moistening continues, surface-based convection is expected
to continue to pose a risk for tornadoes in addition to hail
(potentially significant near supercells). A greater tornado risk
may evolve after the 00Z time frame pending backing of low-level
wind fields due to cyclogenesis along the Rio Grande/Big Bend area.
..Cook.. 03/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SHV...FWD...EWX...SJT...
LAT...LON 31569956 32179905 32709797 33069657 33049602 32809556
32249539 31659587 31029687 30349821 30049936 30160000
30490018 31140019 31569956SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 3:22 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Bosque, Brown, Burnet, Comanche and 32 more | 2 hr |
| Mar 24, 4:38 PM CDT | Tornado Watch | SPC | Bell, Bosque, Brown, Burnet, Comanche, Coryell and 21 more | 5 hr |
| Mar 24, 4:59 PM CDT | Severe Thunderstorm Watch | SPC | Camp, Collin, Cooke, Dallas, Delta, Denton and 18 more | 5 hr |
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.