Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 403
The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2011, 9:09 PM CDT for 27 counties in Texas. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2011, 9:09 PM CDT (02:09 UTC)
- Expired
- Apr 10, 2011, 10:15 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 27 counties
Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Crockett County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Stephens County, TX, Sutton County, TX, Tarrant County, TX, Tom Green County, TX, Wise County, TX
The radar
The Dyess AFB radar (KDYX), 94 km from the middle of the area, began a volume at 02:10 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
Fort Worth, TX (KFWD), launched 00:00Z, 2.2 hours before the alert went out and 235 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
- 637 J/kg
- Mixed-layer CIN
- -268 J/kg
- Mixed-layer LCL
- 1994 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
572 ACUS11 KWNS 110210 SWOMCD SPC MCD 110209 TXZ000-110315- MESOSCALE DISCUSSION 0403 NWS STORM PREDICTION CENTER NORMAN OK 0909 PM CDT SUN APR 10 2011 AREAS AFFECTED...CNTRL TX CONCERNING...SEVERE THUNDERSTORM WATCH 123... VALID 110209Z - 110315Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 123 CONTINUES. A BROKEN LINE OF CONVECTION HAS RAPIDLY DEVELOPED OVER CNTRL TX...AND WILL BE CAPABLE OF PRODUCING LARGE HAIL...DMGG WINDS...AND PERHAPS AN ISOLATED TORNADO. 00Z FWD SOUNDING REFLECTED LITTLE CONVECTIVE INHIBITION REMAINING...AS EVIDENCED BY A RAPIDLY DEVELOPING BROKEN LINE OF CONVECTION THAT HAS INITIATED ALONG THE DRYLINE. ADDITIONAL INITIATION HAS OCCURRED ALONG A COLD FRONT THAT WILL QUICKLY OVERTAKE THE DRYLINE. STEEP MID LEVEL LAPSE RATES NEAR 8 C/KM AND STRONG CLOUD BEARING SHEAR SHOULD SUPPORT OCCASIONAL ROTATION AND LARGE HAIL DEVELOPMENT...WITH DMGG WINDS POSSIBLE IN ANY NEAR-SURFACE BASED STORMS THAT CAN DEVELOP. DRY AIR IN LOW LEVELS WILL LIKELY AID DMGG WIND POTENTIAL BUT HINDER A MORE WIDESPREAD TORNADO THREAT...BUT GIVEN CLOCKWISE TURNING HODOGRAPHS...AN ISOLD TORNADO CANNOT BE RULED OUT. REFER TO MD 0401 FOR ADDITIONAL INFORMATION. ..HURLBUT.. 04/11/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN...EWX...SJT... LAT...LON 30800154 33689772 33599643 31179838 30170079 30800154
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 7:02 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 41 more | 8 hr |
| Apr 10, 11:39 PM CDT | Tornado Watch | SPC | Anderson, Bandera, Bell, Blanco, Bosque, Burnet and 28 more | 7 hr |
| Apr 11, 1:27 AM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Blanco, Bosque, Brown, Burnet and 36 more | 93 min |
| Apr 11, 1:49 AM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Delta, Franklin, Gregg and 14 more | 4 hr |
| Apr 11, 4:19 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more | 56 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.