Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 295
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2012, 6:32 PM CDT for 6 counties in Arkansas; 15 counties in Oklahoma. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2012, 6:32 PM CDT (23:32 UTC)
- Expired
- Mar 19, 2012, 7:30 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 21 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 84 km from the middle of the area, began a volume at 23:34 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, 11.5 hours before the alert went out and 193 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
- 974 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 334 m²/s²
- 0-3 km storm-relative helicity
- 407 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 4.0
The text
As transmitted, in the capitals the NWS used until 2016.
295
ACUS11 KWNS 192332
SWOMCD
SPC MCD 192332
ARZ000-OKZ000-200030-
MESOSCALE DISCUSSION 0295
NWS STORM PREDICTION CENTER NORMAN OK
0632 PM CDT MON MAR 19 2012
AREAS AFFECTED...ERN OK THROUGH NWRN AR
CONCERNING...SEVERE THUNDERSTORM WATCH 86...
VALID 192332Z - 200030Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 86
CONTINUES.
BASED ON RECENT CONVECTIVE TRENDS...ERN OK INTO NWRN AR PORTION OF
SEVERE THUNDERSTORM WATCH MAY NEED TO BE UPGRADED TO A TORNADO
WATCH.
SEVERAL DISCRETE CELLS ARE DEVELOPING OVER ERN OK WHERE BOUNDARY
LAYER WARMING HAS CONTRIBUTED TO 1000 J/KG MLCAPE. HODOGRAPHS ARE
VERY LARGE IN THIS REGION ALONG LLJ AXIS AND SUPPORTIVE OF LOW LEVEL
MESOCYCLONES AND TORNADOES WITH ANY SURFACE BASED CONVECTION. GIVEN
THE DISCRETE MODE WITH ACTIVITY DEVELOPING EAST OF THE LINE AND SIZE
OF HODOGRAPHS...STORMS MAY EVENTUALLY EVOLVE INTO SUPERCELLS WITH AN
ATTENDANT TORNADO THREAT.
..DIAL.. 03/19/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...TSA...OUN...
LAT...LON 34659660 35819527 36459442 36389333 35579385 33979542
33919674 34659660SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 3:55 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Sebastian, Washington | 95 min |
| Mar 19, 4:20 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 5 hr |
| Mar 19, 6:53 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 5 hr |
| Mar 18, 7:37 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Ellis, Greer, Harmon, Jackson and 2 more | 53 min |
| Mar 18, 9:10 PM CDT | Mesoscale Discussion | SPC | Beckham, Ellis, Greer, Harmon, Jackson, Roger Mills and 2 more | 35 min |
| Mar 18, 11:37 PM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper | 53 min |
| Mar 19, 1:37 AM CDT | Mesoscale Discussion | SPC | Beckham, Greer, Harmon, Jackson, Roger Mills | 83 min |
| Mar 19, 1:56 AM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 19 more | 4 hr |
| Mar 19, 3:34 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 21 more | 86 min |
| Mar 19, 10:05 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 15 more | 115 min |
| Mar 19, 2:15 PM CDT | Mesoscale Discussion | SPC | Bryan, Love, Marshall | 90 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Arkansas, 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.