Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 101
The Storm Prediction Center issued this mesoscale discussion at Feb 3, 2012, 11:59 AM CST for 9 counties in Oklahoma; 12 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Feb 3, 2012, 11:59 AM CST (17:59 UTC)
- Expired
- Feb 3, 2012, 1:30 PM CST
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 21 counties
Carter County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Love County, OK, Murray County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 18:00 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, 6.0 hours before the alert went out and 146 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
- 592 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 478 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 343 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.1
The text
As transmitted, in the capitals the NWS used until 2016.
502
ACUS11 KWNS 031759
SWOMCD
SPC MCD 031759
OKZ000-TXZ000-031930-
MESOSCALE DISCUSSION 0101
NWS STORM PREDICTION CENTER NORMAN OK
1159 AM CST FRI FEB 03 2012
AREAS AFFECTED...SWRN OK THROUGH NWRN AND A PORTION OF NCNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 031759Z - 031930Z
STORMS ARE EXPECTED TO DEVELOP AND INTENSIFY FROM NWRN TX THROUGH
SWRN OK THIS AFTERNOON. PRIMARY THREATS WILL BE SUPERCELLS AND LINE
SEGMENTS CAPABLE OF PRODUCING ISOLATED TORNADOES...DAMAGING WIND AND
HAIL.
LOW CLOUDS HAVE BEGUN TO MIX OUT FROM NWRN TX THROUGH SWRN OK WITH
TEMPERATURES RISING INTO THE UPPER 60S ALLOWING FOR BOUNDARY LAYER
DESTABILIZATION. VISIBLE IMAGERY HAS SHOWN AN INCREASE IN
PRE-FRONTAL CUMULUS ALONG MOIST AXIS WITH MLCAPE FROM 800-1200 J/KG.
STORMS ARE EXPECTED TO DEVELOP WITHIN THIS ZONE OF DESTABILIZATION
ALONG AND AHEAD OF COLD FRONT SUPPORTED BY A WEAK CAP AND FURTHER
DIABATIC WARMING. ONCE STORMS BECOME SURFACE BASED...EFFECTIVE BULK
SHEAR AOA 40 KT WILL SUPPORT ORGANIZED STORMS INCLUDING SUPERCELLS
AND BOWING SEGMENTS. A 30-40 KT LLJ WILL PERSIST FROM N TX THROUGH
CNTRL OK THIS AFTERNOON AND WILL MAINTAIN 0-2 KM HODOGRAPHS
SUFFICIENT FOR LOW LEVEL MESOCYCLONES AND POSSIBLE ISOLATED
TORNADOES.
..DIAL.. 02/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...SJT...
LAT...LON 35059784 34629707 33839697 32679809 32499944 33909912
34839872 35059784SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 2, 7:08 PM CST | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 13 more | 67 min |
| Feb 2, 7:38 PM CST | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more | 7 hr |
| Feb 2, 9:48 PM CST | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 11 more | 117 min |
| Feb 2, 11:44 PM CST | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Comanche, Custer and 14 more | 91 min |
| Feb 3, 2:00 AM CST | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 24 more | 60 min |
| Feb 3, 2:25 AM CST | Tornado Watch | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more | 8 hr |
| Feb 3, 7:15 AM CST | Mesoscale Discussion | SPC | Beckham, Caddo, Canadian, Comanche, Cotton, Custer and 8 more | 90 min |
| Feb 3, 9:42 AM CST | Mesoscale Discussion | SPC | Caddo, Comanche, Cotton, Greer, Harmon, Jackson and 3 more | 63 min |
| Feb 3, 12:26 PM CST | Tornado Watch | SPC | Atoka, Bryan, Carter, Comanche, Cotton, Garvin and 8 more | 8 hr |
| Feb 3, 3:17 PM CST | Mesoscale Discussion | SPC | Carter, Garvin, Jefferson, Johnston, Love, Marshall and 1 more | 88 min |
| Feb 3, 5:41 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Coal, Garvin, Hughes and 8 more | 2 hr |
| Feb 3, 6:35 AM CST | Mesoscale Discussion | SPC | Jasper, Newton, Sabine, Tyler | 115 min |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 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.