Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1316
The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2021, 7:21 PM CDT for 12 counties in Oklahoma; 12 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2021, 7:21 PM CDT (00:21 UTC)
- Expired
- Jul 18, 2021, 8:45 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 383
All 24 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woodward County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 139 km from the middle of the area, began a volume at 00:21 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 0.4 hours before the alert went out and 138 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
- 775 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 1818 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
650 ACUS11 KWNS 190022 SWOMCD SPC MCD 190021 OKZ000-TXZ000-190145- Mesoscale Discussion 1316 NWS Storm Prediction Center Norman OK 0721 PM CDT Sun Jul 18 2021 Areas affected...Eastern Texas Panhandle...Western Oklahoma Concerning...Severe Thunderstorm Watch 383... Valid 190021Z - 190145Z The severe weather threat for Severe Thunderstorm Watch 383 continues. SUMMARY...Strong/severe thunderstorms will propagate south across ww383 over the next several hours. Hail/wind remain possible. DISCUSSION...Latest water-vapor imagery depicts a disturbance that has progressed across western KS and is dropping south across the OK Panhandle. This feature appears partly responsible for ongoing convection that has grown upscale into a disorganized MCS that currently stretches from the northern TX Panhandle-western/central OK. Surface analysis suggests a disjointed boundary currently extends from southeast OK-north of Pauls Valley-HBR-AMA, with the western portion of this boundary advancing south, along with convection, at roughly 15-20kt. Strongest updrafts are likely producing hail with this broad cluster of convection and there is some risk for wind with more organized, bowing line segments. Overall, this complex of storms should propagate across the eastern TX Panhandle toward the Red River over the next 1-3 hours. ..Darrow.. 07/19/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OUN...AMA... LAT...LON 36630188 36659846 34759822 34750156 36630188
Nearby
Mesoscale Discussions in Oklahoma, 2021Mesoscale 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.