Alert archive / Texas / Tornado Watches in 2005

Tornado Watch 646

July 19, 200512 counties in Texas

The Storm Prediction Center issued this tornado watch at Jul 19, 2005, 1:35 PM CDT for 12 counties in Texas. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2005, 1:35 PM CDT (18:35 UTC)
Expired: Jul 20, 2005, 12:49 AM CDT
In force: 11 hr
Issued by: the Storm Prediction Center

Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, San Patricio County, TX, Starr County, TX, Willacy County, TX

The radar

The Corpus Christi radar (KCRP), 84 km from the middle of the area, began a volume at 18:35 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.

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jul 19, 2:37 PM CDT	Severe Thunderstorm Warning	CRP	Nueces, San Patricio	28 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

Corpus Christi, TX (KCRP), launched 12:00Z, 6.6 hours before the alert went out and 88 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1659 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 191836
SEL6  
SPC WW 191836
TXZ000-CWZ000-200600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 646
NWS STORM PREDICTION CENTER NORMAN OK
135 PM CDT TUE JUL 19 2005

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTH TEXAS
       COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 135 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 0.5 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 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF CORPUS
CHRISTI TEXAS TO 35 MILES SOUTH OF MCALLEN TEXAS.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU6).

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 645...

DISCUSSION...BANDS OF THUNDERSTORMS WILL BE MOVING ONSHORE S TX AS
HURRICANE EMILY APPROACHES THE NERN COASTAL AREA OF MEXICO. 
EMBEDDED TORNADIC SUPERCELLS POSSIBLY ASSOCIATED WITH THE BANDS OF
STORMS.

THE FORECAST MAXIMUM WIND GUSTS AND MEAN CELL MOTION APPLY TO SEVERE
THUNDERSTORMS OUTSIDE THE HURRICANE EYEWALL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 11035.


...HALES

280,0961 253,0970 253,0991 280,0982

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 11:58 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Hidalgo, Kenedy, Kleberg, Starr and 1 more	2 hr
Jul 19, 5:31 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more	119 min

Nearby

Tornado Watches in Texas, 2005 Every tornado watch 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.