Alert archive / Oklahoma / Mesoscale Discussions in 2018
Mesoscale Discussion 399
The Storm Prediction Center issued this mesoscale discussion at May 13, 2018, 3:41 PM CDT for 6 counties in Kansas; 12 counties in Oklahoma; 12 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 13, 2018, 3:41 PM CDT (20:41 UTC)
- Expired
- May 13, 2018, 5:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 30 counties
Barber County, KS, Clark County, KS, Comanche County, KS, Kingman County, KS, Kiowa County, KS, Pratt County, KS, Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Major County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Lipscomb County, TX, Motley County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 160 km from the middle of the area, began a volume at 20:40 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 8.7 hours before the alert went out and 207 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
- 61 J/kg
- Mixed-layer CIN
- -288 J/kg
- Mixed-layer LCL
- 2990 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| May 13, 3:59 PM CDT | Severe Thunderstorm Watch | SPC | Barber, Clark, Comanche, Edwards, Ellis, Ford and 9 more | 7 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Kansas, 2018Every mesoscale discussion in 2018
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.