Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2049
The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2011, 3:50 PM CDT for 6 parishes in Louisiana; 18 counties in Texas. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2011, 3:50 PM CDT (20:50 UTC)
- Expired
- Aug 24, 2011, 5:15 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 24 counties
Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Camp County, TX, Cherokee County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Hopkins County, TX, Nacogdoches County, TX, Panola County, TX, Rains County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 44 km from the middle of the area, began a volume at 20:53 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
Shreveport, LA (KSHV), launched 12:00Z, 8.8 hours before the alert went out and 53 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
- 1956 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 1219 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
927
ACUS11 KWNS 242051
SWOMCD
SPC MCD 242050
LAZ000-TXZ000-242215-
MESOSCALE DISCUSSION 2049
NWS STORM PREDICTION CENTER NORMAN OK
0350 PM CDT WED AUG 24 2011
AREAS AFFECTED...E TX/CENTRAL LA
CONCERNING...SEVERE THUNDERSTORM WATCH 801...
VALID 242050Z - 242215Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 801
CONTINUES.
WIDESPREAD STORMS AND ISOLATED SEVERE POTENTIAL CONTINUES.
LATEST RADAR IMAGERY SHOWS AN ARCING BAND OF STORMS CONTINUING A
SWWD PROGRESSION ACROSS E TX AND THE CENTRAL THIRD OF LA ATTM...WITH
NEW STORMS INCREASING ACROSS NERN TX. AIRMASS REMAINS FAVORABLY
UNSTABLE ACROSS THIS REGION...BUT DECREASES WITH WWD EXTENT INTO N
TX.
HOWEVER...A WELL-DEFINED GUST FRONT EXTENDS FROM W OF KPRX /PARIS
TX/ IN A SW/EWD ARC TO NEAR KPOE /FT. POLK LA/...WHICH SHOULD
CONTINUE TO FUEL ANAFRONTAL-TYPE DEVELOPMENT OF ADDITIONAL
CONVECTION. WITH FAIRLY DEEP MIXED LAYER /SURFACE DEWPOINT
DEPRESSIONS OF 30 TO 40 F/...EVAPORATIVELY-ASSISTED WIND GUSTS NEAR
SEVERE LEVELS REMAIN POSSIBLE IN LOCAL AREAS. THOUGH THE THREAT
CONTINUES TO SPREAD ACROSS/OUT OF WW 801...NEW WW IS NOT ANTICIPATED
ATTM GIVEN VERY ISOLATED NATURE OF THREAT.
..GOSS.. 08/24/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...JAN...LCH...SHV...HGX...FWD...
LAT...LON 33389521 32609476 32069401 31709272 31769213 31179184
30959386 31489532 32779596 33489567 33389521SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 12:06 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 12 more | 114 min |
| Aug 24, 1:17 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, De Soto, Grant and 6 more | 4 hr |
| Aug 24, 4:44 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Deaf Smith and 10 more | 91 min |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Louisiana, 2011Every mesoscale discussion in 2011
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.