Alert archive / Texas / Special Weather Statements in 2018

Special Weather Statement, NWS Austin/San Antonio, TX

April 3, 2018Blanco County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Apr 3, 2018, 6:47 PM CDT for Blanco County, Texas. It was in force for 43 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: Apr 3, 2018, 6:47 PM CDT (23:47 UTC)
Expired: Apr 3, 2018, 7:30 PM CDT
In force: 43 min
Issued by: NWS Austin/San Antonio, TX

County Blanco County, TX

The radar

The Ft Hood radar (KGRK), 75 km from the middle of the area, began a volume at 23:49 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

Fort Worth, TX (KFWD), launched 12:00Z, 11.8 hours before the alert went out and 278 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: 1112 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 607 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 448 m²/s²
0-3 km storm-relative helicity: 477 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this special weather statement went out at Apr 3, 6:40 PM CDT, 7 minutes earlier.

Area forecast discussion, Apr 3, 6:40 PM CDT, 7 minutes before

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Hazardous weather outlook, Apr 3, 2:55 PM CDT, 3 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
255 PM CDT Tue Apr 3 2018

TXZ171>173-183>194-202>209-217>225-228-042000-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
255 PM CDT Tue Apr 3 2018

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...This Afternoon And Tonight.

Severe thunderstorms will be possible along and east of a line
from Llano to Kerrville to Uvalde. A strong cold front will move
through this afternoon and evening that will bring the potential
for severe storms with very large hail, perhaps up to 2 inches in
diameter, and straight line winds up to 70 mph.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Please report severe weather to local law enforcement or the
National Weather Service.

In the hours before

Special weather statement, Apr 3, 4:37 PM CDT, 2 hours 10 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
437 PM CDT TUE APR 3 2018

TXZ171-172-032230-
Llano TX-Burnet TX-
437 PM CDT TUE APR 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR LLANO AND BURNET COUNTIES UNTIL
530 PM CDT...

At 436 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles north of Copperas Cove to 6 miles
south of Valley Spring. Movement was southeast at 15 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Burnet, Kingsland, Llano, Buchanan Dam, Gainesville, Granite Shoals,
Horseshoe Bay, Buchanan Lake Village, Highland Haven, Inks Lake State
Park, Watson, Bluffton, Lake Victor, Baby Head, Stolz, Joppa, Oxford,
Shady Grove, Lone Grove and Valley Spring.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms 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.

&&

A Severe Thunderstorm Watch remains in effect until 600 PM CDT for
south central Texas.

LAT...LON 3103 9790 3091 9783 3088 9786 3050 9852
      3050 9878 3079 9894 3092 9871 3092 9842
      3094 9841 3096 9845 3098 9844 3101 9846
      3103 9844
TIME...MOT...LOC 2136Z 326DEG 15KT 3128 9791 3076 9881

TB3

Special weather statement, Apr 3, 6:47 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
647 PM CDT TUE APR 3 2018

TXZ190>192-040030-
Blanco TX-Hays TX-Travis TX-
647 PM CDT TUE APR 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HAYS...NORTHWESTERN
TRAVIS AND NORTHEASTERN BLANCO COUNTIES UNTIL 730 PM CDT...

At 645 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cypress Mill, or 10 miles southeast of Round Mountain, moving east at
40 mph.

Dime to penny sized hail and winds in excess of 40 mph will be
possible with this storm.

Locations impacted include...
Austin, Leander, Lakeway, Lago Vista, Bee Cave, Hudson Bend, The
Hills, Cypress Mill, Pedernales Falls State Park, Mansfield Dam,
Jonestown, Briarcliff, Point Venture, Volente and Lost Creek.

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Texas.

LAT...LON 3032 9781 3022 9825 3039 9832 3045 9821
      3043 9813 3046 9810 3049 9810 3049 9812
      3051 9811 3061 9794
TIME...MOT...LOC 2345Z 250DEG 36KT 3034 9819

TB3

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 10:00 AM CDT	Special Weather Statement	EWX	Burnet	45 min
Apr 3, 10:30 AM CDT	Special Weather Statement	EWX	Llano	45 min
Apr 3, 10:44 AM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	31 min
Apr 3, 11:13 AM CDT	Severe Thunderstorm Warning	EWX	Burnet	17 min
Apr 3, 4:37 PM CDT	Special Weather Statement	EWX	Burnet, Llano	53 min
Apr 3, 4:43 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	47 min

Nearby

Special Weather Statements in Texas, 2018 Every special weather statement in 2018

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.