Alert archive / Texas / Special Weather Statements in 2017
Special Weather Statement, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this special weather statement at Jul 23, 2017, 2:21 PM CDT for Llano County, Texas. It was in force for 24 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
- Jul 23, 2017, 2:21 PM CDT (19:21 UTC)
- Expired
- Jul 23, 2017, 2:45 PM CDT
- In force
- 24 min
- Issued by
- NWS Austin/San Antonio, TX
County Llano County, TX
The radar
The Ft Hood radar (KGRK), 136 km from the middle of the area, began a volume at 19:22 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 12:00Z, 7.4 hours before the alert went out and 248 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
- 501 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
622
WWUS84 KEWX 231921
SPSEWX
Special Weather Statement
National Weather Service Austin/San Antonio TX
221 PM CDT SUN JUL 23 2017
TXZ171-231945-
Llano TX-
221 PM CDT SUN JUL 23 2017
...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL LLANO COUNTY UNTIL
245 PM CDT...
At 220 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles southwest of Valley Spring to near
Llano. Movement was southwest at 15 mph.
Pea to dime size hail and winds in excess of 40 mph will be possible
with these storms.
Locations impacted include...
Llano and Castell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3081 9862 3061 9871 3061 9896 3076 9897
3080 9896
TIME...MOT...LOC 1920Z 059DEG 13KT 3078 9888 3076 9872
$$
RUNYENThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 2:02 PM CDT | Special Weather Statement | EWX | Williamson | 28 min |
| Jul 23, 2:04 PM CDT | Special Weather Statement | EWX | Burnet | 26 min |
| Jul 23, 2:51 PM CDT | Special Weather Statement | EWX | Llano | 39 min |
| Jul 23, 3:01 PM CDT | Special Weather Statement | EWX | Travis | 29 min |
| Jul 23, 3:17 PM CDT | Special Weather Statement | EWX | Gillespie | 28 min |
| Jul 23, 3:27 PM CDT | Special Weather Statement | EWX | Hays | 33 min |
| Jul 23, 3:36 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Hays | 38 min |
| Jul 23, 3:42 PM CDT | Special Weather Statement | EWX | Gillespie | 48 min |
Nearby
Special Weather Statements in Texas, 2017Every 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.