Alert archive / Oklahoma / Mesoscale Discussions in 2018
Mesoscale Discussion 661
The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2018, 8:42 AM CDT for 20 counties in Oklahoma; Cooke County, Grayson County, Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 7, 2018, 8:42 AM CDT (13:42 UTC)
- Expired
- Jun 7, 2018, 10:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 22 counties
Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Cooke County, TX, Grayson County, TX
The radar
The Norman radar (KTLX), 60 km from the middle of the area, began a volume at 13:45 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
Norman, OK (KOUN), launched 12:00Z, 1.7 hours before the alert went out and 47 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
- 2137 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1220 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
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 |
|---|---|---|---|---|
| Jun 7, 1:58 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Grant, Woods | 92 min |
| Jun 7, 2:25 AM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Grant, Woods | 5 hr |
| Jun 7, 4:35 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Woods | 85 min |
| Jun 7, 3:10 PM CDT | Mesoscale Discussion | SPC | Beckham, Ellis, Greer, Harmon, Jackson, Roger Mills | 95 min |
| Jun 7, 3:28 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Custer, Dewey, Ellis, Greer, Harmon and 6 more | 5 hr |
| Jun 7, 6:17 PM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Ellis, Greer, Harmon and 6 more | 118 min |
| Jun 7, 4:44 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Dallas, Ellis, Franklin, Gregg and 22 more | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Texas, 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.