Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 569
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2012, 9:13 PM CDT for 25 counties in Oklahoma; 6 counties in Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2012, 9:13 PM CDT (02:13 UTC)
- Expired
- Apr 19, 2012, 10:15 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 31 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Cooke County, TX, Denton County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Wise County, TX
The radar
The Norman radar (KTLX), 134 km from the middle of the area, began a volume at 02:14 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 00:00Z, 2.2 hours before the alert went out and 122 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
- 348 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 1750 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
008
ACUS11 KWNS 200214
SWOMCD
SPC MCD 200213
OKZ000-TXZ000-200315-
MESOSCALE DISCUSSION 0569
NWS STORM PREDICTION CENTER NORMAN OK
0913 PM CDT THU APR 19 2012
AREAS AFFECTED...CNTRL-SRN OK / N-CNTRL TX
CONCERNING...SEVERE THUNDERSTORM WATCH 183...
VALID 200213Z - 200315Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 183
CONTINUES.
SCTD BROKEN CLUSTER OF STRONG/SEVERE STORMS --CAPABLE OF PRIMARILY
LARGE HAIL-- WILL CONTINUE TO PROGRESS EWD INVOF THE I-35 CORRIDOR
IN CNTRL OK SWD TOWARDS THE NRN PART OF THE DFW METROPLEX DURING THE
NEXT 1-2 HRS. THERE IS UNCERTAINTY WHETHER OR NOT THE SEVERE THREAT
WILL LEAK EWD OUT OF THE EXISTING WW...AND AN AREAL EXTENSION OR NEW
WW MAY NEED TO BE CONSIDERED AS STORMS APPROACH THE ERN BOUNDS OF WW
183.
COMPOSITE SURFACE/RADAR ANALYSIS SHOWS A FRONTAL SEGMENT
ACCELERATING SEWD ACROSS WRN N-CNTRL TX TO THE STORM CLUSTER NEAR
YOUNG AND JACK COUNTIES /TX/. ANOTHER PORTION OF THE FRONT HAS
ADVANCED SEWD ACROSS THE NRN PORTIONS OF THE WW NEAR THE OKC
METRO...ENHANCING LOW LEVEL LIFT AND AIDING IN THE FILLING-IN OF A
LINEAR CONGLOMERATION OF STORMS JUST NW OF I-44. IN BETWEEN THE 2
AFOREMENTIONED SURFACE BOUNDARIES EXISTS A SLOW MOVING N-S ORIENTED
FRONTAL SEGMENT ACROSS SWRN OK--SERVING AS A GENESIS REGION FOR MORE
RECENT STORM DEVELOPMENT.
00Z OUN RAOB SHOWED STEEP MID-LEVEL LAPSE RATES WITH PW/S NEAR 1
INCH--RESULTING IN MODERATE CAPE /1300 J PER KG/. STRONG FLOW AT H5
/50 KTS/ HAS ACTED TO SUPPORT SUPERCELLULAR STRUCTURE THIS
EVENING...AND HAS CONTRIBUTED TO LARGE HAIL GROWTH WITH THE MORE
ROBUST UPDRAFTS /RECENT HAIL REPORTS 1 TO 2.5 INCH IN DIAMETER/. AS
THIS ACTIVITY MOVES EWD...A MODEST FEED OF LOW LEVEL MOISTURE WITHIN
A STRENGTHENING LOW LEVEL JET MAY ACT TO SUSTAIN A PORTION OF THESE
STORMS TO THE ERN BOUND OF WW 183--ESPECIALLY ACROSS OK WHERE THE
CAP WAS SHOWN TO BE WEAKER /PER OUN AND FWD RAOBS/. CONVECTIVE
TRENDS WILL CONTINUE TO BE MONITORED CONCERNING POSSIBLE WW AREAL
EXTENSION OR THE NEED FOR AN ADDITIONAL DOWNSTREAM WW ACROSS E-CNTRL
OK.
..SMITH.. 04/20/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...FWD...OUN...
LAT...LON 32909889 34169782 35279826 35949656 35799570 35079530
34479561 33139676 32959717 32879831 32909889SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:29 PM CDT | Mesoscale Discussion | SPC | Craig, Garfield, Kay, Major, Noble, Nowata and 6 more | 2 hr |
| Apr 19, 10:49 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Cleveland, Coal, Comanche and 22 more | 116 min |
| Apr 20, 12:35 PM CDT | Mesoscale Discussion | SPC | Angelina, Aransas, Austin, Bee, Brazoria, Calhoun and 33 more | 2 hr |
| Apr 20, 12:57 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Austin, Bastrop, Bee, Brazoria, Brazos and 43 more | 7 hr |
| Apr 20, 1:30 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 7 more | 2 hr |
| Apr 20, 2:29 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 10 more | 5 hr |
| Apr 20, 3:44 PM CDT | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Brazos, Burleson, Chambers and 27 more | 91 min |
| Apr 20, 4:48 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Hidalgo, Kenedy, Kleberg, Nueces and 2 more | 57 min |
| Apr 20, 6:12 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 18 more | 93 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.