Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 514
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2012, 7:35 PM CDT for 30 counties in Oklahoma; Childress County, Collingsworth County, Hardeman County, Texas. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2012, 7:35 PM CDT (00:35 UTC)
- Expired
- Apr 13, 2012, 8:30 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 33 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tillman County, OK, Tulsa County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Hardeman County, TX
The radar
The Altus AFB radar (KFDR), 94 km from the middle of the area, began a volume at 00:35 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 00:00Z, 0.6 hours before the alert went out and 112 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
- 2227 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 269 m²/s²
- 0-3 km storm-relative helicity
- 389 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 15.6
The text
As transmitted, in the capitals the NWS used until 2016.
399
ACUS11 KWNS 140035
SWOMCD
SPC MCD 140035
OKZ000-TXZ000-140130-
MESOSCALE DISCUSSION 0514
NWS STORM PREDICTION CENTER NORMAN OK
0735 PM CDT FRI APR 13 2012
AREAS AFFECTED...SOUTHWEST/CENTRAL/NORTHEAST OK AND PART OF
NORTHWEST TX
CONCERNING...TORNADO WATCH 160...
VALID 140035Z - 140130Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 160 CONTINUES.
TORNADO WATCH 160 CONTINUES UNTIL 02Z...WITH POTENTIAL FOR TORNADOES
AND LARGE HAIL. INDICATIONS ARE THAT A REPLACEMENT TORNADO WATCH
WILL BE NEEDED IN THE NEXT HOUR OR SO FOR PORTIONS OF OK AND PERHAPS
ADJACENT PARTS OF NORTHWEST TX/EASTERN TX PANHANDLE.
MOST CONCENTRATED/SUSTAINED SEVERE POTENTIAL IS EXPECTED TO REMAIN
ESPECIALLY FOCUSED ACROSS SOUTHWEST OK/ADJACENT NORTHWEST TX OVER
THE NEXT FEW HOURS. AN ONGOING SUPERCELL IN KIOWA COUNTY OK HAD
TEMPORARILY WEAKENED FROM ITS EARLIER PROLIFIC INTENSITY AS OF
0000Z...BUT A REINTENSIFICATION HAS OCCURRED WITHIN A RELATIVELY
FAVORABLE ENVIRONMENT ACROSS SOUTHWEST OK. THE AFOREMENTIONED STORM
HAS APPEARED TO FAVOR THE IMMEDIATE COOL SIDE OF AN OUTFLOW BOUNDARY
LEFT BY EARLIER STORMS. A MORE STABLE RAIN-COOLED AIRMASS CURRENTLY
EXISTS ACROSS CENTRAL OK...ALTHOUGH THE 00Z OBSERVED SOUNDING FROM
NORMAN WAS INDICATIVE OF ONLY A VERY SHALLOW STABLE LAYER /0.5 KM/.
AS SUCH...COLD POOL ABATEMENT/OUTFLOW MODIFICATION COULD YET OCCUR
THIS EVENING INTO CENTRAL OK AS A LOW LEVEL JET INTENSIFIES.
WEST OF THE LEAD STORM ACROSS KIOWA COUNTY...ADDITIONAL SUSTAINED
SUPERCELL DEVELOPMENT CAN BE EXPECTED JUST NORTH OF THE CHILDRESS TX
AREA INTO FAR SOUTHWEST/EVENTUALLY WEST-CENTRAL OK...WITH THESE
STORMS ALSO LIKELY TO FAVOR THE PERPETUALLY-REINFORCED WEST-EAST
OUTFLOW BOUNDARY AS A MODERATELY UNSTABLE /2000-2500 J PER KG
MLCAPE/ BOUNDARY LAYER REMAINS ALONG/SOUTH OF IT. REGIONAL WIND
PROFILERS/WSR-88D DERIVED WINDS ARE INDICATIVE OF A
STRENGTHENING/BACKING TREND WITHIN THE LOWEST FEW KM DURING THE PAST
SEVERAL HOURS...WITH THE FREDERICK OK WSR-88D VWP ALREADY INDICATIVE
OF 200+ M2/S2 0-1 KM SRH. THIS SAME TREND IS EXPECTED TO CONTINUE
THIS EVENING AND HELP MAINTAIN A SUPERCELL/TORNADO THREAT
TONIGHT...ESPECIALLY ACROSS MUCH OF SOUTHWEST OK/ADJACENT PARTS OF
TX.
..GUYER.. 04/14/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...OUN...LUB...AMA...
LAT...LON 34209999 34580050 35370004 36829775 36499535 35489648
34179897 34209999SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 8:36 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more | 7 hr |
| Apr 13, 9:58 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 19 more | 92 min |
| Apr 13, 11:45 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 20 more | 90 min |
| Apr 14, 2:40 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more | 65 min |
| Apr 14, 3:42 AM CDT | Tornado Watch | SPC | Craig, Creek, Delaware, Kay, Lincoln, Logan and 11 more | 5 hr |
| Apr 14, 7:11 AM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Kay, Logan, Mayes, Noble and 8 more | 64 min |
| Apr 14, 9:42 AM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Ellis, Harper, Roger Mills, Texas | 93 min |
| Apr 14, 10:43 AM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 12 more | 7 hr |
| Apr 14, 11:44 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Ellis, Garfield, Grant, Harper and 3 more | 61 min |
| Apr 14, 12:11 PM CDT | Mesoscale Discussion | SPC | Grant, Kay, Noble, Osage, Pawnee, Washington | 64 min |
| Apr 14, 1:23 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Blaine, Caddo, Canadian, Carter and 21 more | 2 hr |
| Apr 14, 3:01 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Custer, Dewey, Ellis, Greer and 9 more | 29 min |
| Apr 14, 3:48 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 10 more | 57 min |
| Apr 14, 4:54 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Dewey, Ellis, Grant, Harper, Major and 3 more | 66 min |
| Apr 14, 5:24 PM CDT | Tornado Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 18 more | 9 hr |
| Apr 13, 9:23 PM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Donley, Hall and 1 more | 97 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Texas, 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.