Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 132, NWS Austin/San Antonio, TX

May 23, 2017Atascosa County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 23, 2017, 6:42 PM CDT for Atascosa County, Texas. It was in force for 17 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, 6:42 PM CDT (23:42 UTC)
Expired: May 23, 2017, 6:59 PM CDT
In force: 17 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Atascosa County, TX

The radar

The Austin/San Antonio radar (KEWX), 115 km from the middle of the area, began a volume at 23:45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 23, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 11.7 hours before the alert went out and 147 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: 749 J/kg
Mixed-layer CIN: -292 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

655 
WUUS54 KEWX 232342
SVREWX
TXC013-240015-
/O.NEW.KEWX.SV.W.0132.170523T2342Z-170524T0015Z/

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

The National Weather Service in Austin San Antonio has issued a

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

* Until 715 PM CDT

* At 642 PM CDT, severe thunderstorms were located along a line
  extending from near Campbellton to near Christine, moving southeast
  at 35 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...
  Campbellton, Fashing and Peggy. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2864 9834 2864 9856 2875 9860 2886 9817
      2879 9810 2861 9833
TIME...MOT...LOC 2342Z 334DEG 32KT 2880 9824 2874 9850 

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

RUNYEN

1 follow-up statement

479 
WWUS54 KEWX 232359
SVSEWX

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

TXC013-240008-
/O.CAN.KEWX.SV.W.0132.000000T0000Z-170524T0015Z/
Atascosa TX-
659 PM CDT TUE MAY 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ATASCOSA COUNTY
IS CANCELLED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been cancelled.

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

LAT...LON 2864 9834 2864 9856 2875 9860 2886 9817
      2879 9810 2861 9833
TIME...MOT...LOC 2357Z 334DEG 32KT 2868 9817 2862 9843 

$$

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, 6:34 PM CDT, 8 minutes earlier.

Area forecast discussion, May 23, 6:34 PM CDT, 8 minutes before

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

.AVIATION... /00Z TAFS/
Storms are rapidly pulling away from the I-35 TAF sites and should
be clear of all the ewx counties by around 02Z. Some gusty winds will
remain possible over the next 2-3 hours but winds are forecasts to
ease up by late evening. Post frontal cigs should remain vfr for the
I-35 TAF sites and clear out in the mid to late evening hours.

&&

.PREV DISCUSSION... /ISSUED 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...Runyen
Synoptic/Grids...Oaks
Public Service/Data Collection...Williams

Hazardous weather outlook, May 23, 5:25 AM CDT, 13 hours 17 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, 6:02 PM CDT, 40 minutes before

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

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

0549 PM     HAIL             PAIGE                   30.22N 97.12W
05/23/2017  E1.25 INCH       BASTROP            TX   PUBLIC

            HAIL SLIGHTLY LARGER THAN QUARTERS IN PAIGE. TIME
            ESTIMATED FROM RADAR.

&&

BMW

Local storm report, May 23, 6:07 PM CDT, 35 minutes before

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

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

0601 PM     HAIL             3 ENE LEMING            29.08N 98.43W
05/23/2017  E1.00 INCH       ATASCOSA           TX   TRAINED SPOTTER

            QUARTER SIZED HAIL ALONG INTERSTATE 37 NEAR LEMING. TIME
            ESTIMATED FROM RADAR.

&&

BMW

Local storm report, May 23, 6:14 PM CDT, 28 minutes before

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

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

0600 PM     TSTM WND GST     GIDDINGS                30.18N 96.93W
05/23/2017  M75 MPH          LEE                TX   TRAINED SPOTTER

            STORM SPOTTER MEASURED 75 MPH WIND GUST IN GIDDINGS. ALSO
            REPORTED QUARTER SIZED HAIL. TIME ESTIMATED FROM RADAR.

&&

BMW

Local storm report, May 23, 6:15 PM CDT, 27 minutes before

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

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

0600 PM     HAIL             1 N GIDDINGS            30.20N 96.93W
05/23/2017  E1.25 INCH       LEE                TX   PUBLIC

            QUARTER UP TO THE SIZE OF HALF DOLLARS IN GIDDINGS. TIME
            ESTIMATED FROM RADAR.

&&

BMW

Local storm report, May 23, 6:27 PM CDT, 15 minutes before

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

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

0601 PM     TSTM WND DMG     1 S GIDDINGS            30.17N 96.93W
05/23/2017                   LEE                TX   PUBLIC

            REPORTS OF LARGE OAK TREES SNAPPED ON THE SOUTH SIDE OF
            GIDDINGS.

&&

BMW

Special weather statement, May 23, 6:35 PM CDT, 7 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
635 PM CDT TUE MAY 23 2017

TXZ220-240015-
Atascosa TX-
635 PM CDT TUE MAY 23 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ATASCOSA COUNTY
UNTIL 715 PM CDT...

At 635 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Christine to 7 miles northeast of Campbellton.
Movement was southeast at 30 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Christine, Campbellton, Peggy, McCoy and Fashing.

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

LAT...LON 2864 9834 2864 9850 2881 9864 2889 9820
      2879 9810 2861 9833
TIME...MOT...LOC 2335Z 314DEG 28KT 2879 9852 2884 9822

RUNYEN

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, 5:54 PM CDT	Severe Thunderstorm Warning	EWX	Frio	36 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, 6:56 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.