Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 129, NWS Austin/San Antonio, TX

May 23, 2017Frio County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 23, 2017, 5:54 PM CDT for Frio County, Texas. It was in force for 36 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 23, 2017, 5:54 PM CDT (22:54 UTC)
Expired: May 23, 2017, 6:30 PM CDT
In force: 36 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Frio County, TX

The radar

The Laughlin AFB radar (KDFX), 133 km from the middle of the area, began a volume at 22:56 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 10.9 hours before the alert went out and 187 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: 1036 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

851 
WUUS54 KEWX 232254
SVREWX
TXC163-232330-
/O.NEW.KEWX.SV.W.0129.170523T2254Z-170523T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
554 PM CDT TUE MAY 23 2017

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southeastern Frio County in south central Texas...

* Until 630 PM CDT

* At 554 PM CDT, a severe thunderstorm was located over Derby, or
  near Dilley, moving southeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Dilley and Derby. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2872 9926 2887 9915 2873 9880 2865 9880
      2864 9915
TIME...MOT...LOC 2254Z 300DEG 33KT 2876 9913 

HAIL...1.00IN
WIND...60MPH
 
$$

RUNYEN

1 follow-up statement

465 
WWUS54 KEWX 232328
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
628 PM CDT TUE MAY 23 2017

TXC163-232337-
/O.EXP.KEWX.SV.W.0129.000000T0000Z-170523T2330Z/
Frio TX-
628 PM CDT TUE MAY 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRIO COUNTY WILL
EXPIRE AT 630 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Texas.

LAT...LON 2872 9926 2887 9915 2873 9880 2865 9880
      2864 9915
TIME...MOT...LOC 2327Z 300DEG 33KT 2862 9885 

$$

RUNYEN

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 23, 2:15 PM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, May 23, 2:15 PM CDT, 3 hours 39 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
215 PM CDT Tue May 23 2017

.SHORT TERM (Tonight through Wednesday Night)...
The cold front is currently beginning to enter our CWA and is best
evident by pressure rises behind the frontal boundary. Winds ahead of
the front are already out of a northerly direction as a boundary
associated with a dying complex of storms this morning came through
the area. This will decrease our surface convergence when the actual
front makes it to the region. This should overall limit the coverage
of showers and storms for the northern Hill Country for surface based
activity. Storms will be more likely to fire across the southern
half of the region where surface winds are lighter and convergence
will be maximized. However, elevated showers and thunderstorms can be
seen on area radars to our north and this activity is developing
under the influence of strong lift as evident on water vapor
imagery. This is evidence that we will have plenty of upper support
for sustained convection later today. As the strong lift arrives, we
could also see some elevated convection behind the front as well as
any boundary layer convection that develops along the frontal
boundary. CAPE values this afternoon will be in the 2000-3000 J/kg
range with the higher values maximized across the eastern CWA. 0-6 km
shear values near 50 knots will definitely support supercellular
structures with any of the stronger activity. Large hail will
initially be the main threat from any severe thunderstorms, but there
could be some high wind reports as well especially later in the
afternoon and evening. Thunderstorm chances will end from north to
south in the late afternoon and evening.

Cooler air is expected to filter into the region behind the front as
is already evident by the near 60 degree temperatures in the Abilene
region north of the front. Lows tonight should bottom out in the 50s
for much of the area with some upper 40s even possible across low-
lying areas in the Hill Country. The only record that could be broken
tonight is Austin Bergstrom airport where the current forecast is 2
degrees under its record low. For tomorrow, clear skies will be in
place across the region with light winds. Should be nice overall,
with highs in the lower to middle 80s over much of the area.

&&

.LONG TERM (Thursday through Tuesday)...
The beginning of the long-term forecast will be dry with with
increasing temperatures. Highs on Thursday will quickly be back into
the lower 90s with even some upper 90s across the southwestern CWA.
Temperatures will even be a couple of degrees warmer on Friday as an
upper ridge builds to our south. Lows Friday morning will also be
warm, in the lower to middle 70s.

The upper air pattern will begin to shift on Saturday as a longwave
trough begins to move through the central CONUS. Should see the first
effects of this on Saturday night with some possible warm air
advection activity ahead of an approaching cold frontal boundary.
This frontal boundary will approach the CWA on Sunday and this will
bring an increase to the precip chances to the area. It looks like a
decent chance of showers and storms will remain in the area behind
the front on Memorial Day and into Tuesday as southwest flow remains
in place across the region. Will forecast 30-40 PoPs in this period
for now, but these may have to be increased over the next several
days. Instability amounts on Sunday could support some strong storms,
but this could change as we near the weekend, and will continue to
monitor the chances of stronger convection.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              56  85  64  91  74 /  30   0   0  -   -
Austin Bergstrom Intl Airport  55  84  61  91  74 /  30   0   0  -   -
New Braunfels Muni Airport     54  85  61  91  74 /  40   0   0  -   -
Burnet Muni Airport            52  83  61  90  72 /  10   0   0  -   -
Del Rio Intl Airport           57  86  64  94  74 /  10   0   0  -   -
Georgetown Muni Airport        54  83  62  91  74 /  30   0   0  -   -
Hondo Muni Airport             52  86  61  93  74 /  20   0   0  -   -
San Marcos Muni Airport        54  85  61  92  74 /  40   0   0  -   -
La Grange - Fayette Regional   55  84  62  90  74 /  50   0   0  -   -
San Antonio Intl Airport       55  86  64  92  74 /  30   0   0  -   -
Stinson Muni Airport           57  86  62  92  75 /  40   0   0  -   -

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

Mesoscale/Aviation...17
Synoptic/Grids...Hampshire
Public Service/Data Collection...YB

Hazardous weather outlook, May 23, 5:25 AM CDT, 12 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
525 AM CDT Tue May 23 2017

TXZ171>173-183>194-202>209-217>225-228-241030-
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-
525 AM CDT Tue May 23 2017

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

.DAY ONE...Today And Tonight.

A final round of scattered showers and thunderstorms is expected
mainly this afternoon across most of South Central Texas except
for the Edwards Plateau. A few of these storms could be strong to
severe, with large hail and damaging straight-line winds the main
threats.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to relay severe weather reports to the
National Weather Service.

In the hours before

Local storm report, May 23, 5:34 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
534 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0516 PM     TSTM WND DMG     2 SSE ROUND ROCK        30.49N 97.66W
05/23/2017                   WILLIAMSON         TX   TRAINED SPOTTER

            LARGE TREE SNAPPED IN HALF.

&&

BMW

Local storm report, May 23, 5:36 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
536 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0518 PM     HAIL             4 NE PFLUGERVILLE       30.48N 97.57W
05/23/2017  E1.00 INCH       TRAVIS             TX   TRAINED SPOTTER

            QUARTER SIZED HAIL REPORT FROM SPOTTER.

&&

BMW

Local storm report, May 23, 5:43 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
543 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     TSTM WND DMG     ELGIN                   30.35N 97.37W
05/23/2017                   BASTROP            TX   TRAINED SPOTTER

            SMALL TREE LIMBS DOWN IN ELGIN.

&&

BMW

Local storm report, May 23, 5:45 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
545 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0516 PM     HAIL             PFLUGERVILLE            30.44N 97.62W
05/23/2017  E1.00 INCH       TRAVIS             TX   TRAINED SPOTTER

            HAIL UP TO THE SIZE OF QUARTERS REPORTED IN PFLUGERVILLE

&&

BMW

Local storm report, May 23, 5:47 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
547 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             SOMERSET                29.23N 98.66W
05/23/2017  E1.00 INCH       BEXAR              TX   PUBLIC

            QUARTER SIZED HAIL IN SOMERSET. TIME ESTIMATED FROM
            RADAR.

&&

BMW

Local storm report, May 23, 5:51 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
551 PM CDT TUE MAY 23 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0534 PM     TSTM WND DMG     2 E ELGIN               30.35N 97.34W
05/23/2017                   BASTROP            TX   EMERGENCY MNGR

            BASTROP COUNTY EM REPORTS WIDESPREAD WIND DAMAGE IN AND
            AROUND ELGIN. REPORTS OF BOTH POWER LINES AND TREES
            DOWNED ACROSS THE AREA.

&&

BMW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 4:12 PM CDT	Special Weather Statement	EWX	Burnet	33 min
May 23, 4:16 PM CDT	Special Weather Statement	EWX	Uvalde	29 min
May 23, 4:28 PM CDT	Special Weather Statement	EWX	Bexar	32 min
May 23, 4:31 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde, Zavala	44 min
May 23, 4:46 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Wilson	44 min
May 23, 5:03 PM CDT	Special Weather Statement	EWX	Travis	42 min
May 23, 5:13 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Zavala	47 min
May 23, 5:19 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Travis, Williamson	41 min
May 23, 5:23 PM CDT	Special Weather Statement	EWX	Medina	52 min
May 23, 5:25 PM CDT	Special Weather Statement	EWX	Travis	50 min
May 23, 5:27 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar	33 min
May 23, 5:32 PM CDT	Special Weather Statement	EWX	Wilson	28 min
May 23, 5:52 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Fayette, Lee	53 min
May 23, 5:56 PM CDT	Special Weather Statement	EWX	Bastrop, Fayette, Travis	49 min
May 23, 5:57 PM CDT	Special Weather Statement	EWX	Hays	48 min
May 23, 5:58 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Wilson	35 min
May 23, 6:11 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Hays, Travis	49 min
May 23, 6:35 PM CDT	Special Weather Statement	EWX	Atascosa	40 min
May 23, 6:42 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa	17 min
May 23, 6:56 PM CDT	Special Weather Statement	EWX	Fayette	49 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Every severe thunderstorm warning 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.