Alert archive / Texas / Tornado Watches in 2006
Tornado Watch 821
The Storm Prediction Center issued this tornado watch at Oct 10, 2006, 6:43 AM CDT for 26 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2006, 6:43 AM CDT (11:43 UTC)
- Expired
- Oct 10, 2006, 2:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 26 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, Grimes County, TX, Hays County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Polk County, TX, Robertson County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX
The radar
The Ft Hood radar (KGRK), 74 km from the middle of the area, began a volume at 11:43 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 10%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 9:17 AM CDT | Severe Thunderstorm Warning | EWX | Hays | 58 min |
| Oct 10, 9:25 AM CDT | Flash Flood Warning | FWD | Robertson | 3 hr |
| Oct 10, 9:45 AM CDT | Tornado Warning | HGX | Burleson | 30 min |
| Oct 10, 10:18 AM CDT | Tornado Warning | HGX | Brazos, Burleson | 42 min |
| Oct 10, 10:33 AM CDT | Severe Thunderstorm Warning | HGX | Washington | 42 min |
| Oct 10, 11:36 AM CDT | Tornado Warning | HGX | Waller, Washington | 39 min |
| Oct 10, 12:38 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery | 52 min |
| Oct 10, 1:19 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery | 41 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 11.7 hours before the alert went out and 238 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2676 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 101141
SEL1
SPC WW 101141
TXZ000-101900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 821
NWS STORM PREDICTION CENTER NORMAN OK
640 AM CDT TUE OCT 10 2006
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL TEXAS
EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 640 AM UNTIL
200 PM CDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF HUNTSVILLE
TEXAS TO 15 MILES EAST SOUTHEAST OF NEW BRAUNFELS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 820...
DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO PERSIST INVOF STALLED
OUTFLOW BOUNDARY AND FRONT OVER THE TX HILL COUNTRY. THIS ACTIVITY
SHOULD MOVE/DEVELOP E TOWARD THE MIDDLE TX CSTL PLN AS SURFACE
HEATING OCCURS AND THE LOWER LEVELS CONTINUE TO MOISTEN. GIVEN RICH
BOUNDARY LAYER MOISTURE AND MODERATE LOW LEVEL DIRECTIONAL
SHEAR...POTENTIAL WILL EXIST FOR ISOLATED TORNADOES UNTIL LOW LEVEL
FLOW VEERS LATER IN THE DAY.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 25035.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 9, 7:44 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Culberson, Dawson, Ector and 15 more | 91 min |
| Oct 9, 10:44 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 20 more | 2 hr |
| Oct 9, 11:17 PM CDT | Severe Thunderstorm Watch | SPC | Coke, Concho, Crockett, Edwards, Irion, Kimble and 7 more | 6 hr |
| Oct 10, 1:43 AM CDT | Mesoscale Discussion | SPC | Bandera, Brewster, Crockett, Edwards, Gillespie, Kendall and 13 more | 92 min |
| Oct 10, 3:18 AM CDT | Tornado Watch | SPC | Bandera, Bell, Blanco, Burnet, Coryell, Crockett and 20 more | 7 hr |
| Oct 10, 5:00 AM CDT | Mesoscale Discussion | SPC | Austin, Bandera, Bastrop, Bell, Bexar, Blanco and 49 more | 90 min |
| Oct 10, 8:52 AM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Bexar, Blanco, Burnet, Comal and 27 more | 83 min |
| Oct 10, 9:31 AM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bastrop, Brazos, Burleson and 32 more | 119 min |
| Oct 10, 11:28 AM CDT | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Brazos, Colorado, Fayette and 15 more | 92 min |
| Oct 10, 11:48 AM CDT | Tornado Watch | SPC | Brazoria, Calhoun, Chambers, Fort Bend, Galveston, Hardin and 8 more | 5 hr |
| Oct 10, 12:34 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 14 more | 56 min |
| Oct 10, 1:39 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 12 more | 96 min |
| Oct 10, 3:08 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Galveston, Jefferson and 4 more | 97 min |
Nearby
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.