Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 423
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2012, 9:12 PM CDT for 19 counties in Oklahoma; 18 counties in Texas. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 9:12 PM CDT (02:12 UTC)
- Expired
- Apr 2, 2012, 10:15 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 37 counties
Beaver County, OK, Beckham County, OK, Caddo County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Jack County, TX, Knox County, TX, Lipscomb County, TX, Ochiltree County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 64 km from the middle of the area, began a volume at 02:16 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, 2.2 hours before the alert went out and 199 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
- 1334 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
392
ACUS11 KWNS 030212
SWOMCD
SPC MCD 030212
TXZ000-OKZ000-KSZ000-030315-
MESOSCALE DISCUSSION 0423
NWS STORM PREDICTION CENTER NORMAN OK
0912 PM CDT MON APR 02 2012
AREAS AFFECTED...NERN TX PANHANDLE...WRN OK...TX BIG COUNTRY
CONCERNING...SEVERE THUNDERSTORM WATCH 129...
VALID 030212Z - 030315Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 129
CONTINUES.
REPLACEMENT OF PORTIONS OF WW 129 WILL LIKELY BE COORDINATED BY
03Z...PRIOR TO 04Z SCHEDULED EXPIRATION.
02Z SURFACE ANALYSIS PLACED A NEARLY STATIONARY CYCLONE OVER THE
NERN TX PANHANDLE WITH A PACIFIC COLD FRONT/DRYLINE ARCING SWD
TOWARDS THE TX BIG COUNTRY. TSTMS RAPIDLY GREW UPSCALE INTO A QLCS
AS THE COLD FRONT OVERTOOK THE DRYLINE ACROSS THE NERN TX PANHANDLE
INTO NWRN TX. LOW-LEVEL SELYS HAVE STRENGTHENED AHEAD OF THIS LINE
TO 30-40 KT PER FDR VWP DATA MAINTAINING A FEED OF LOWER TO MIDDLE
60S SURFACE DEW POINTS ACROSS WRN OK. FARTHER E...SURFACE DEW POINTS
HAVE FALLEN INTO MIDDLE 50S ACROSS S-CNTRL OK IN THE WAKE OF
CONVECTIVE OUTFLOW FROM THE DYING MCS OVER THE LOWER MS VALLEY. AS
SUCH...GREATEST SEVERE THREAT SHOULD EXIST DURING THE NEXT FEW HOURS
ACROSS MAINLY SWRN OK/NWRN TX. CONVECTIVE MODE WILL LARGELY MITIGATE
SIGNIFICANT HAIL...BUT THREATS FOR EMBEDDED SEVERE HAIL ALONG WITH
ISOLATED DAMAGING WINDS AND EVEN A BRIEF TORNADO WILL REMAIN
POSSIBLE.
..GRAMS.. 04/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...DDC...SJT...AMA...
LAT...LON 35690070 36120089 36530091 36890071 37150022 37159981
35519821 34919785 33519771 32929797 32739821 32609860
32639916 32939973 33219985 34199976 35060003 35690070SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 7:17 PM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper, Roger Mills, Texas | 58 min |
| Apr 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more | 5 hr |
| Apr 3, 1:14 AM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Comanche, Cotton, Garfield, Garvin and 12 more | 2 hr |
| Apr 3, 3:32 AM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Comanche, Cotton, Grady, Jefferson and 2 more | 88 min |
| Apr 3, 8:36 AM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Jefferson, Johnston, Love, Marshall and 2 more | 84 min |
| Apr 3, 9:18 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more | 8 hr |
| Apr 3, 11:47 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Jefferson, Johnston and 3 more | 118 min |
| Apr 3, 2:21 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Johnston, Love and 2 more | 84 min |
| Apr 3, 2:36 PM CDT | Tornado Watch | SPC | McCurtain | 7 hr |
| Apr 3, 3:05 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 5 more | 85 min |
| Apr 3, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 3 more | 6 hr |
| Apr 2, 11:45 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more | 2 hr |
| Apr 3, 12:08 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more | 9 hr |
| Apr 3, 1:12 PM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Dallas, Denton, Ellis, Erath and 16 more | 93 min |
| Apr 3, 1:46 PM CDT | Mesoscale Discussion | SPC | Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 9 more | 89 min |
| Apr 3, 4:38 PM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more | 67 min |
| Apr 3, 5:00 PM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Delta, Falls and 18 more | 60 min |
| Apr 3, 6:53 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bastrop, Bowie, Brazos, Burleson and 24 more | 67 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.