Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 234
The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2021, 10:44 PM CDT for Choctaw County, Oklahoma; 12 counties in Texas. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Mar 22, 2021, 10:44 PM CDT (03:44 UTC)
- Expired
- Mar 22, 2021, 11:45 PM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Choctaw County, OK, Delta County, TX, Fannin County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Rains County, TX, Red River County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 183 km from the middle of the area, began a volume at 03:45 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
Fort Worth, TX (KFWD), launched 00:00Z, 3.7 hours before the alert went out and 169 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
- 679 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 404 m²/s²
- 0-3 km storm-relative helicity
- 672 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
779
ACUS11 KWNS 230344
SWOMCD
SPC MCD 230344
OKZ000-TXZ000-230445-
Mesoscale Discussion 0234
NWS Storm Prediction Center Norman OK
1044 PM CDT Mon Mar 22 2021
Areas affected...northeastern Texas and far southeastern Oklahoma
Concerning...Severe potential...Watch unlikely
Valid 230344Z - 230445Z
Probability of Watch Issuance...20 percent
SUMMARY...A well-organized linear segment continues to move
northeastward across Hunt County, Texas and will pose a damaging
wind threat for the next hour or so.
DISCUSSION...A fairly pronounced line of storms continued to migrate
northeastward across northeastern Texas currently. This line has a
history of near-severe wind gusts (46 knots at Rockwell) over the
past hour. Its organization is likely aiding in persistence beyond
the extent of the instability axis (back over central/north-central
Texas), though strong shear and forcing for ascent aloft will likely
aid in persistence of this storm for at least the next hour or so.
One-inch hail stones are also possible with this system.
..Cook/Guyer.. 03/23/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SHV...TSA...FWD...OUN...
LAT...LON 33689626 34089605 34209574 34239519 34119489 33709483
33169494 32759507 32509568 32539630 32769642 33689626SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 8:25 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Bell, Blanco, Bosque, Brown and 53 more | 65 min |
| Mar 22, 10:21 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bell, Bexar, Blanco, Bosque and 52 more | 54 min |
| Mar 22, 11:10 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Bandera, Bastrop, Bexar, Blanco, Brazos and 29 more | 5 hr |
| Mar 23, 1:29 AM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Brazos and 29 more | 91 min |
| Mar 23, 3:19 AM CDT | Mesoscale Discussion | SPC | Angelina, Austin, Colorado, DeWitt, Fayette, Fort Bend and 20 more | 56 min |
Nearby
Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Oklahoma, 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.