Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 138
The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2012, 4:50 PM CST for 4 states. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2012, 4:50 PM CST (22:50 UTC)
- Expired
- Feb 20, 2012, 5:45 PM CST
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 38 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Allen County, KS, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barry County, MO, Barton County, MO, Cedar County, MO, Dade County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Vernon County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Ottawa County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 65 km from the middle of the area, began a volume at 22:49 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
Springfield, MO (KSGF), launched 12:00Z, 10.8 hours before the alert went out and 116 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
- 773 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
566
ACUS11 KWNS 202251
SWOMCD
SPC MCD 202250
MOZ000-ARZ000-OKZ000-KSZ000-202345-
MESOSCALE DISCUSSION 0138
NWS STORM PREDICTION CENTER NORMAN OK
0450 PM CST MON FEB 20 2012
AREAS AFFECTED...PORTIONS SERN KS...SERN MO...E-CENTRAL/NERN
OK...NWRN AR.
CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON
VALID 202250Z - 202345Z
NEW WW WILL BE COORDINATED SHORTLY WITH AFFECTED WFOS E OF EXISTING
WW 33...TO COVER POTENTIAL FOR BAND OF STG-SVR TSTMS TO PRODUCE
MAINLY DAMAGING WIND OVER THIS REGION BEFORE DISSIPATING LATER THIS
EVENING.
..EDWARDS.. 02/20/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SGF...EAX...TSA...TOP...ICT...
LAT...LON 35449622 37539598 38219597 38179386 36899338 35659369
35349499 35449622SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 5:01 PM CST | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Washington | 4 hr |
| Feb 20, 5:37 PM CST | Mesoscale Discussion | SPC | Benton, Crawford, Franklin, Madison, Sebastian, Washington | 113 min |
| Feb 20, 1:39 PM CST | Mesoscale Discussion | SPC | Barber, Barton, Butler, Cowley, Ellsworth, Harper and 11 more | 66 min |
| Feb 20, 2:50 PM CST | Severe Thunderstorm Watch | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Greenwood and 8 more | 4 hr |
| Feb 20, 5:33 PM CST | Mesoscale Discussion | SPC | Clay, Cloud, Marshall, Republic, Riley, Washington | 57 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Missouri, 2012Mesoscale Discussions in Kansas, 2012Every mesoscale discussion in 2012
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.