Alert archive / Texas / Mesoscale Discussions in 2020
Mesoscale Discussion 1809
The Storm Prediction Center issued this mesoscale discussion at Nov 24, 2020, 8:03 PM CST for 8 counties in Oklahoma; 15 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Nov 24, 2020, 8:03 PM CST (02:03 UTC)
- Expired
- Nov 24, 2020, 9:30 PM CST
- In force
- 87 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 60%
All 23 counties
Bryan County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK, Collin County, TX, Dallas County, TX, 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, Rockwall County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Western Arkansas radar (KSRX), 185 km from the middle of the area, began a volume at 02:02 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
Fort Worth, TX (KFWD), launched 00:00Z, 2.1 hours before the alert went out and 200 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
- 878 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 996 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 318 m²/s²
- 0-3 km storm-relative helicity
- 316 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 8.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 24, 8:20 PM CST | Mesoscale Discussion | SPC | Cherokee, Craig, Creek, Delaware, Mayes, Muskogee and 7 more | 55 min |
| Nov 24, 8:29 PM CST | Severe Thunderstorm Watch | SPC | Choctaw, Haskell, Latimer, LeFlore, McCurtain, Pittsburg and 2 more | 6 hr |
| Nov 24, 11:07 PM CST | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 4 more | 83 min |
| Nov 25, 1:17 AM CST | Mesoscale Discussion | SPC | Angelina, Houston, Jasper, Nacogdoches, Newton, Panola and 8 more | 118 min |
Nearby
Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020
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.