Alert archive / Texas / Mesoscale Discussions in 2018
Mesoscale Discussion 470
The Storm Prediction Center issued this mesoscale discussion at May 19, 2018, 9:58 PM CDT for 17 counties in Oklahoma; 18 counties in Texas. It was in force for 107 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2018, 9:58 PM CDT (02:58 UTC)
- Expired
- May 19, 2018, 11:45 PM CDT
- In force
- 107 min
- Issued by
- the Storm Prediction Center
All 35 counties
Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Crosby County, TX, Dickens County, TX, Foard County, TX, Garza County, TX, Hardeman County, TX, Hockley County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Stonewall County, TX, Terry County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 44 km from the middle of the area, began a volume at 03:02 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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 3.0 hours before the alert went out and 177 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
- 1717 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1316 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.0
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 20, 1:11 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 23 more | 2 hr |
| May 20, 2:24 PM CDT | Mesoscale Discussion | SPC | Ottawa | 3 hr |
| May 20, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | Delaware, Ottawa | 4 hr |
| May 19, 7:42 PM CDT | Mesoscale Discussion | SPC | Coke, Concho, Crockett, Edwards, Irion, Kimble and 9 more | 63 min |
| May 20, 1:23 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Brazos and 30 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Oklahoma, 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.