Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 964
The Storm Prediction Center issued this mesoscale discussion at May 25, 2011, 5:15 PM CDT for 29 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- May 25, 2011, 5:15 PM CDT (22:15 UTC)
- Expired
- May 25, 2011, 6:15 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 29 counties
Anderson County, TX, Austin County, TX, Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, Fayette County, TX, Freestone County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Houston County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Robertson County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 93 km from the middle of the area, began a volume at 22:17 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
Fort Worth, TX (KFWD), launched 12:00Z, 10.3 hours before the alert went out and 253 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
- 310 J/kg
- Mixed-layer CIN
- -362 J/kg
- Mixed-layer LCL
- 2205 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
636
ACUS11 KWNS 252215
SWOMCD
SPC MCD 252215
TXZ000-252315-
MESOSCALE DISCUSSION 0964
NWS STORM PREDICTION CENTER NORMAN OK
0515 PM CDT WED MAY 25 2011
AREAS AFFECTED...CNTRL/SERN TX
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 252215Z - 252315Z
A HIGHLY CONDITIONAL THREAT OF SUPERCELLS CAPABLE OF LARGE HAIL AND
DMGG WINDS IS POSSIBLE OVER PORTIONS OF CNTRL/SERN TX. SHOULD
CONVECTION APPEAR MORE IMMINENT...A WW MAY BECOME NECESSARY.
VISIBLE IMAGERY REFLECTS AN INCREASING CU FIELD FROM AUSTIN TO NEAR
HEARNE TX WHERE SURFACE OBS SHOW MORE FAVORABLE SURFACE CONVERGENCE
IN ASSOCIATION WITH A DRYLINE. VERY STRONG DIURNAL HEATING HAS LED
TO HOT SURFACE TEMPERATURES IN THE MID TO UPPER 90S...WHICH MAY BE
SUFFICIENT TO OVERCOME REMAINING CONVECTIVE INHIBITION. WITH THE
STRONGEST UPPER FORCING REMAINING NORTH OF THE AREA...DEVELOPMENT OF
STORMS MAY BE MORE ISOLATED IN NATURE. HOWEVER...SHOULD STORMS
EVOLVE...VERY STEEP LAPSE RATES AND DEEP LAYER SHEAR IN EXCESS OF 50
KT WILL BE CONDUCIVE TO LARGE HAIL PRODUCTION.
..HURLBUT.. 05/25/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...HGX...FWD...EWX...
LAT...LON 32009576 31609521 31099486 30339523 29199694 29189793
29969843 30819762 32009576SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 7:42 PM CDT | Mesoscale Discussion | SPC | Bowie, Franklin, Red River, Titus | 63 min |
| May 24, 8:05 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Delta, Fannin, Franklin and 15 more | 7 hr |
| May 24, 11:00 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Burnet, Coryell, Falls, Freestone and 6 more | 60 min |
| May 24, 11:22 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Coryell, Falls, Freestone, Henderson and 7 more | 5 hr |
| May 24, 11:24 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Franklin, Hopkins, Marion and 5 more | 96 min |
| May 25, 3:10 AM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 8 more | 95 min |
| May 25, 1:53 PM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Gregg and 10 more | 2 hr |
| May 25, 3:16 PM CDT | Tornado Watch | SPC | Angelina, Cass, Cherokee, Gregg, Harrison, Marion and 6 more | 7 hr |
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.