Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2190
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2011, 6:18 PM CDT for 12 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2011, 6:18 PM CDT (23:18 UTC)
- Expired
- Sep 18, 2011, 7:15 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Bandera County, TX, Bexar County, TX, Blanco County, TX, Comal County, TX, Edwards County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Medina County, TX, Real County, TX, Uvalde County, TX
The radar
The Laughlin AFB radar (KDFX), 113 km from the middle of the area, began a volume at 23:20 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
Del Rio, TX (KDRT), launched 12:00Z, 11.3 hours before the alert went out and 158 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
- 1433 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 566 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.7
The text
As transmitted, in the capitals the NWS used until 2016.
610
ACUS11 KWNS 182318
SWOMCD
SPC MCD 182318
TXZ000-190015-
MESOSCALE DISCUSSION 2190
NWS STORM PREDICTION CENTER NORMAN OK
0618 PM CDT SUN SEP 18 2011
AREAS AFFECTED...PORTIONS OF CNTRL/S-CNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 182318Z - 190015Z
AN ISOLATED HAIL/WIND THREAT MAY MATERIALIZE THIS EVENING ACROSS
PORTIONS OF CNTRL/S-CNTRL TX. CONVECTIVE TRENDS ARE BEING
MONITORED...BUT A WW APPEARS UNLIKELY ATTM.
RECENT RADAR LOOP SHOWS SEVERAL SMALL TSTM CLUSTERS SLOWLY
PROPAGATING SWD ACROSS CNTRL TX. THESE TSTMS ARE MOVING INTO AN
UNSTABLE /MLCAPE 2000-2500 J/KG/ AND WEAKLY CAPPED AIR MASS...WHICH
SHOULD CONTINUE TO SUPPORT FURTHER SWD PROPAGATION. DESPITE THE
PRESENCE OF RATHER WEAK 0-6 KM FLOW...SLY LOW-LEVEL FLOW BENEATH
NWLY MIDLEVEL FLOW IS YIELDING MODEST EFFECTIVE VERTICAL SHEAR /NEAR
30 KTS PER 23Z RUC OBJECTIVE ANALYSIS/ WHICH SHOULD MAINTAIN
MULTICELLULAR STRUCTURE. HOWEVER...WITH STRONGEST FORCED ASCENT
ASSOCIATED WITH AN UPPER WAVE SITUATED WELL N OF THE REGION...AND
TSTMS MOVING OFF THE SFC COLD FRONT...PROPAGATION WILL PRIMARILY BE
COLD-POOL DRIVEN AND WILL ONLY YIELD A LOCALIZED WIND/HAIL THREAT.
DUE TO THE EXPECTED ISOLATED/MARGINAL NATURE OF THE SVR THREAT...A
WW IS NOT ANTICIPATED.
..ROGERS.. 09/18/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EWX...
LAT...LON 29459833 29239875 29139948 29170029 29430071 29830080
30170060 30230011 30229940 30339891 30409849 30389802
30029784 29459833SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 10:17 PM CDT | Mesoscale Discussion | SPC | Cooke, Grayson, Montague, Wise | 88 min |
| Sep 18, 3:59 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 46 more | 31 min |
| Sep 18, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bosque, Brown, Callahan, Coke, Coleman and 51 more | 9 hr |
| Sep 18, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 12 more | 7 hr |
| Sep 18, 6:48 PM CDT | Mesoscale Discussion | SPC | Lamar, Red River | 57 min |
Nearby
Mesoscale Discussions in Texas, 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.