Alert archive / Oklahoma / Mesoscale Discussions in 2018
Mesoscale Discussion 1668
The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2018, 3:51 PM CST for 26 counties in Oklahoma; 4 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Nov 30, 2018, 3:51 PM CST (21:51 UTC)
- Expired
- Nov 30, 2018, 5:15 PM CST
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 30 counties
Atoka County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Logan 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, Clay County, TX, Cooke County, TX, Grayson County, TX, Montague County, TX
The radar
The Norman radar (KTLX), 58 km from the middle of the area, began a volume at 21:51 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
Norman, OK (KOUN), launched 12:00Z, 9.9 hours before the alert went out and 44 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1498 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 242 m²/s²
- 0-3 km storm-relative helicity
- 337 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 |
|---|---|---|---|---|
| Nov 30, 3:34 PM CST | Mesoscale Discussion | SPC | Adair, Haskell, Latimer, LeFlore, McCurtain, Pushmataha and 1 more | 116 min |
| Nov 30, 5:23 PM CST | Tornado Watch | SPC | Adair, Atoka, Bryan, Caddo, Canadian, Carter and 48 more | 8 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.