Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 151, NWS Austin/San Antonio, TX

December 30, 2002Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Dec 30, 2002, 3:59 PM CST for Williamson County, Texas. It was in force for 61 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 30, 2002, 3:59 PM CST (21:59 UTC)
Expired: Dec 30, 2002, 5:00 PM CST
In force: 61 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Williamson County, TX

What was reported inside it

Time	Report	Where	Remark
Dec 30, 4:10 PM CST	Hail 0.75	Georgetown, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 30, 12:00 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.0 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.

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: 966 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

251 
WUUS54 KEWX 302159
SVRSAT
TXC491-302300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
358 PM CST MON DEC 30 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  WILLIAMSON

* UNTIL 500 PM CST

* AT 358 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A   
  SEVERE THUNDERSTORM OVER SERENADA...MOVING NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  RURAL WILLIAMSON COUNTY AT 410 PM

A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO MOVE TO A
PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM IF A TORNADO IS SPOTTED.


LAT...LON 3077 9790 3053 9754 3066 9726 3082 9767

$$

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 30, 1:26 PM CST	Severe Thunderstorm Warning	EWX	Kerr, Real	64 min
Dec 30, 1:48 PM CST	Severe Thunderstorm Warning	EWX	Burnet, Williamson	42 min
Dec 30, 1:53 PM CST	Severe Thunderstorm Warning	EWX	Medina	37 min
Dec 30, 1:57 PM CST	Severe Thunderstorm Warning	EWX	Bexar	63 min
Dec 30, 2:05 PM CST	Tornado Warning	EWX	Bexar	55 min
Dec 30, 2:26 PM CST	Tornado Warning	EWX	Comal	64 min
Dec 30, 3:05 PM CST	Tornado Warning	EWX	Hays	55 min
Dec 30, 3:18 PM CST	Tornado Warning	EWX	Caldwell	57 min
Dec 30, 3:28 PM CST	Severe Thunderstorm Warning	EWX	Bexar	62 min
Dec 30, 3:29 PM CST	Severe Thunderstorm Warning	EWX	Travis	61 min
Dec 30, 3:50 PM CST	Severe Thunderstorm Warning	EWX	Guadalupe	55 min
Dec 30, 3:53 PM CST	Severe Thunderstorm Warning	EWX	Comal	52 min
Dec 30, 3:58 PM CST	Tornado Warning	EWX	Bastrop	62 min
Dec 30, 4:22 PM CST	Tornado Warning	EWX	Williamson	53 min
Dec 30, 5:00 PM CST	Severe Thunderstorm Warning	EWX	Gonzales	60 min
Dec 30, 5:11 PM CST	Tornado Warning	EWX	Bastrop, Fayette, Lee	64 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.