Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 2146
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2003, 5:16 PM CDT for 27 counties in Texas. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2003, 5:16 PM CDT (22:16 UTC)
- Expired
- Aug 11, 2003, 6:15 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 27 counties
Anderson County, TX, Angelina County, TX, Austin County, TX, Brazoria County, TX, Brazos County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Fort Bend County, TX, Freestone County, TX, Galveston County, TX, Grimes County, TX, Harris County, TX, Houston County, TX, Jackson County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Matagorda County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 104 km from the middle of the area, began a volume at 22:16 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.3 hours before the alert went out and 250 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
- 1341 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1100 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 63 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 112217 SWOMCD SPC MCD 112216 TXZ000-112315- MESOSCALE DISCUSSION 2146 NWS STORM PREDICTION CENTER NORMAN OK 0516 PM CDT MON AUG 11 2003 AREAS AFFECTED...SOUTHEAST TEXAS CONCERNING...SEVERE THUNDERSTORM WATCH 856... VALID 112216Z - 112315Z THUNDERSTORM COMPLEX NOW APPROACHING VCT HAS LARGE...WELL-DEVELOPED COLD POOL. THIS FEATURE SHOULD CONTINUE TO MOVE/DEVELOP SSW DURING THE NEXT FEW HOURS. THREAT FOR ADDITIONAL SURFACE-BASED ACTIVITY IN AREA BETWEEN HOU AND VCT SHOULD REMAIN MINIMAL DURING THIS PERIOD. JUST N OF WW...WIDELY SCATTERED STORMS CONTINUE TO DEVELOP ABOVE SHALLOW LAYER OF COOL AIR IN AREA BETWEEN ACT AND LFK. GIVEN MODERATE NNELY FLOW IN THE STORM-BEARING LAYER...THIS ACTIVITY WILL LIKELY MOVE SSW INTO REGION W/N OF HOU DURING THE NEXT SEVERAL HOURS. SEVERE THREAT WITH THIS ACTIVITY SHOULD...HOWEVER...BE MINIMAL AND WW 856 WILL EXPIRE AS SCHEDULED AT 2300 UTC. ..CORFIDI.. 08/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...SHV...HGX...FWD...CRP...EWX... 28449656 28949676 30109678 30719650 31449632 32069609 32119489 31309454 30259451 29429455 28879550
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 11:31 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazoria, Brazos, Burleson, Caldwell and 27 more | 89 min |
| Aug 11, 12:05 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Colorado, Fort Bend, Galveston, Harris and 8 more | 6 hr |
| Aug 11, 2:06 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 31 more | 54 min |
| Aug 11, 2:31 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bee, Bexar and 44 more | 29 min |
| Aug 11, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 21 more | 5 hr |
| Aug 11, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Clay, Collin, Comanche, Cooke, Dallas and 17 more | 5 hr |
| Aug 11, 5:29 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Ellis, Grayson, Navarro, Rockwall | 2 hr |
| Aug 11, 6:09 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bandera, Bastrop, Bee, Bexar and 42 more | 96 min |
Nearby
Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003
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.