Alert archive / Texas / Mesoscale Discussions in 2005
Mesoscale Discussion 321
The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2005, 10:57 AM CST for 33 counties in Texas. It was in force for 33 min.
The area
The outline as issued.
The facts
- Issued
- Mar 21, 2005, 10:57 AM CST (16:57 UTC)
- Expired
- Mar 21, 2005, 11:30 AM CST
- In force
- 33 min
- Issued by
- the Storm Prediction Center
All 33 counties
Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bexar County, TX, Brazoria County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Harris County, TX, Hays County, TX, Jackson County, TX, Karnes County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, San Jacinto County, TX, Travis County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX
The radar
The Austin/San Antonio radar (KEWX), 136 km from the middle of the area, began a volume at 16:57 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
Corpus Christi, TX (KCRP), launched 12:00Z, 5.0 hours before the alert went out and 215 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
- 167 J/kg
- Mixed-layer CIN
- -316 J/kg
- Mixed-layer LCL
- 622 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 211658 SWOMCD SPC MCD 211657 TXZ000-211730- MESOSCALE DISCUSSION 0321 NWS STORM PREDICTION CENTER NORMAN OK 1057 AM CST MON MAR 21 2005 AREAS AFFECTED...PORTIONS OF CENTRAL TX TO THE UPPER TX COAST CONCERNING...SEVERE THUNDERSTORM WATCH 55... VALID 211657Z - 211730Z WW MAY BE REQUIRED SOON FOR PORTIONS OF CENTRAL TX EWD INTO SE TX. VIS IMAGERY THIS MORNING HAS INDICATED MAINLY CLEAR SKIES BETWEEN VCT AND THE HOU AREA...ALLOWING FOR SURFACE HEATING WITHIN AN AXIS OF RICH MOISTURE. THUNDERSTORMS...CURRENTLY OVER THE SERN PORTION OF WW 055 /IN HAYS COUNTY/ HAVE SHOWN SOME INCREASE IN INTENSITY PER LIGHTNING DATA SUGGESTING THEY HAVE BECOME MORE ROOTED TOWARD THE SURFACE. THIS TREND IS EXPECTED TO CONTINUE INTO THE AFTERNOON FROM AROUND SAT EWD INTO SE TX...WITH ADDITIONAL DESTABILIZATION AND DEEP LAYER SHEAR MORE THAN SUFFICIENT FOR SUPERCELLS. ..PETERS.. 03/21/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...HGX...CRP...EWX... 28639883 30149888 30329795 30519610 30779474 30629451 29599434 28829533 28509617 28669722
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 3:39 AM CST | Mesoscale Discussion | SPC | Bosque, Clay, Collin, Comanche, Cooke, Dallas and 26 more | 3 hr |
| Mar 21, 6:05 AM CST | Severe Thunderstorm Watch | SPC | Bastrop, Bell, Blanco, Bosque, Brown, Burnet and 59 more | 6 hr |
| Mar 21, 7:43 AM CST | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Bosque, Brown, Burleson and 60 more | 92 min |
| Mar 21, 9:26 AM CST | Mesoscale Discussion | SPC | Anderson, Bastrop, Bell, Blanco, Bosque, Burleson and 57 more | 34 min |
| Mar 21, 2:59 PM CST | Mesoscale Discussion | SPC | Anderson, Camp, Cherokee, Delta, Falls, Fannin and 18 more | 3 hr |
| Mar 21, 5:10 PM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bowie, Brazoria, Brazos and 55 more | 95 min |
| Mar 21, 5:40 PM CST | Tornado Watch | SPC | Anderson, Angelina, Austin, Bowie, Brazos, Camp and 40 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2005Every mesoscale discussion in 2005
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.