Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Austin/San Antonio, TX

May 20, 2017Gillespie County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 20, 2017, 2:21 AM CDT for Gillespie County, Texas. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 20, 2017, 2:21 AM CDT (07:21 UTC)
Expired: May 20, 2017, 3:00 AM CDT
In force: 39 min
Issued by: NWS Austin/San Antonio, TX

County Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 116 km from the middle of the area, began a volume at 07:23 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

Del Rio, TX (KDLF), launched 00:00Z, 7.4 hours before the alert went out and 216 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: 2212 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 1581 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

320 
WWUS84 KEWX 200721
SPSEWX

Special Weather Statement
National Weather Service Austin/San Antonio TX
221 AM CDT SAT MAY 20 2017
 
TXZ171-188-200800-
Gillespie TX-Llano TX-
221 AM CDT SAT MAY 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR GILLESPIE AND SOUTHWESTERN LLANO
COUNTIES UNTIL 300 AM CDT...

At 221 AM CDT, Doppler radar was tracking a strong thunderstorm over
Doss, or 20 miles northwest of Fredericksburg, moving east at 35 mph.

Wind gusts up to 50 mph and small hail will be possible with this 
storm.

Locations impacted include...
Fredericksburg, Stonewall, Cherry Spring, Luckenbach, Cain City,
Tivydale, Doss, Rocky Hill, Harper, Prairie Mountain, Blumenthal,
Eckert, Crabapple, Grapetown and Enchanted Rock Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Austin San Antonio.

&&

LAT...LON 3014 9859 3013 9930 3050 9930 3050 9896
      3067 9896 3067 9882
TIME...MOT...LOC 0721Z 248DEG 30KT 3044 9915 

$$

TB3

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 11:37 PM CDT	Special Weather Statement	EWX	Burnet, Williamson	53 min
May 20, 12:51 AM CDT	Special Weather Statement	EWX	Burnet, Williamson	54 min
May 20, 1:00 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	60 min
May 20, 1:23 AM CDT	Special Weather Statement	EWX	Gillespie	52 min
May 20, 1:57 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	48 min
May 20, 2:30 AM CDT	Special Weather Statement	EWX	Burnet	45 min
May 20, 2:41 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	49 min
May 20, 3:05 AM CDT	Special Weather Statement	EWX	Llano	40 min
May 20, 3:16 AM CDT	Areal Flood Advisory	EWX	Burnet, Travis, Williamson	3 hr
May 20, 3:41 AM CDT	Special Weather Statement	EWX	Edwards, Val Verde	94 min
May 20, 3:54 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	66 min
May 20, 4:40 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	50 min
May 20, 5:13 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	47 min
May 20, 5:20 AM CDT	Severe Thunderstorm Warning	EWX	Edwards	40 min
May 20, 6:00 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	48 min
May 20, 6:03 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr	46 min
May 20, 6:09 AM CDT	Special Weather Statement	EWX	Gillespie	51 min
May 20, 6:33 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	27 min
May 20, 6:52 AM CDT	Special Weather Statement	EWX	Edwards	53 min
May 20, 7:27 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kinney, Real, Uvalde	63 min
May 20, 8:26 AM CDT	Special Weather Statement	EWX	Blanco	49 min
May 20, 8:29 AM CDT	Severe Thunderstorm Warning	EWX	Uvalde	61 min
May 20, 9:28 AM CDT	Severe Thunderstorm Warning	EWX	Medina, Uvalde, Zavala	62 min
May 20, 10:13 AM CDT	Areal Flood Advisory	EWX	Medina, Uvalde	3 hr
May 20, 10:48 AM CDT	Flash Flood Warning	EWX	Medina, Uvalde	3 hr
May 20, 11:17 AM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina	58 min
May 20, 12:00 PM CDT	Areal Flood Advisory	EWX	Frio	3 hr
May 20, 12:22 PM CDT	Severe Thunderstorm Warning	EWX	Frio	68 min
May 20, 12:40 PM CDT	Flash Flood Warning	EWX	Frio	3 hr
May 20, 1:24 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Zavala	81 min
May 20, 3:04 PM CDT	Special Weather Statement	EWX	Frio	56 min
May 20, 3:12 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Zavala	48 min
May 20, 3:48 PM CDT	Special Weather Statement	EWX	Dimmit	27 min
May 20, 3:54 PM CDT	Areal Flood Advisory	EWX	Frio	3 hr

Nearby

Special Weather Statements in Texas, 2017 Every special weather statement in 2017

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.