Alert archive / Oklahoma / Mesoscale Discussions in 2013
Mesoscale Discussion 501
The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 5:23 PM CDT for 43 counties in Oklahoma; 9 counties in Texas. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2013, 5:23 PM CDT (22:23 UTC)
- Expired
- Apr 17, 2013, 7:00 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 52 counties
Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Norman radar (KTLX), 6 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 23 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
- 1182 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 407 m²/s²
- 0-3 km storm-relative helicity
- 433 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 12:41 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Grant, Harper, Woods, Woodward | 94 min |
| Apr 17, 9:50 AM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Ottawa, Washington | 55 min |
| Apr 17, 1:09 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 39 more | 96 min |
| Apr 17, 1:21 PM CDT | Tornado Watch | SPC | Blaine, Caddo, Canadian, Carter, Cherokee, Cleveland and 45 more | 10 hr |
| Apr 17, 6:30 PM CDT | Mesoscale Discussion | SPC | Cleveland, Comanche, Grady, McClain | 90 min |
| Apr 17, 2:30 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 27 more | 90 min |
| Apr 17, 6:48 PM CDT | Mesoscale Discussion | SPC | Callahan, Eastland, Jones, Shackelford, Stephens, Taylor and 2 more | 87 min |
Nearby
Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013
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.