Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Austin/San Antonio, TX

January 2, 20174 counties in Texas

NWS Austin/San Antonio, TX issued this special weather statement at Jan 2, 2017, 3:53 AM CST for 4 counties in Texas. It was in force for 37 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: Jan 2, 2017, 3:53 AM CST (09:53 UTC)
Expired: Jan 2, 2017, 4:30 AM CST
In force: 37 min
Issued by: NWS Austin/San Antonio, TX

Counties Blanco County, TX, Burnet County, TX, Gillespie County, TX, Llano County, TX

The radar

The Ft Hood radar (KGRK), 104 km from the middle of the area, began a volume at 09:55 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 00:00Z, 9.9 hours before the alert went out and 267 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1528 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 160 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 Jan 2, 2:20 AM CST, 1 hour 33 minutes earlier.

Area forecast discussion, Jan 2, 2:20 AM CST, 1 hour 33 minutes before

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Hazardous weather outlook, Jan 1, 5:06 AM CST, 22 hours 47 minutes before

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In the hours before

Special weather statement, Jan 2, 12:19 AM CST, 3 hours 34 minutes before

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Special weather statement, Jan 2, 1:31 AM CST, 2 hours 22 minutes before

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Special weather statement, Jan 2, 3:09 AM CST, 44 minutes before

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Special weather statement, Jan 2, 3:53 AM CST, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
353 AM CST MON JAN 2 2017

TXZ171>173-188-190>192-021030-
Hays TX-Williamson TX-Llano TX-Gillespie TX-Travis TX-Blanco TX-
Burnet TX-
353 AM CST MON JAN 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR BURNET...NORTHWESTERN TRAVIS...
WESTERN WILLIAMSON...GILLESPIE...BLANCO...NORTHWESTERN HAYS AND LLANO
COUNTIES UNTIL 430 AM CST...

At 351 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles north of Briggs to near Willow City to
near Mountain Home. Movement was to the east southeast at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Cedar Park, Georgetown, Fredericksburg, Kingsland, Marble Falls,
Burnet, Llano, Dripping Springs, Bertram, Round Mountain, Buchanan
Dam, Serenada, Leander, Gainesville, Lakeway, Lago Vista, Granite
Shoals, Bee Cave, Horseshoe Bay and The Hills.

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.

A severe thunderstorm watch remains in effect until 900 AM CST for
south central Texas.

LAT...LON 3091 9783 3085 9757 3011 9811 3014 9930
      3037 9930 3050 9912 3050 9897 3061 9896
      3082 9867 3104 9799 3103 9791
TIME...MOT...LOC 0951Z 335DEG 14KT 3098 9788 3042 9865 3017 9942

LJH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 2, 12:19 AM CST	Special Weather Statement	EWX	Val Verde	26 min
Jan 2, 1:31 AM CST	Special Weather Statement	EWX	Edwards	44 min
Jan 2, 3:09 AM CST	Special Weather Statement	EWX	Gillespie, Kerr, Llano, Real	36 min
Jan 2, 4:15 AM CST	Special Weather Statement	EWX	Travis, Williamson	45 min
Jan 2, 5:00 AM CST	Special Weather Statement	EWX	Bastrop	30 min
Jan 2, 5:14 AM CST	Special Weather Statement	EWX	Comal	31 min
Jan 2, 5:26 AM CST	Special Weather Statement	EWX	Lee	34 min
Jan 2, 5:36 AM CST	Severe Thunderstorm Warning	EWX	Bastrop, Lee	39 min

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.