Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 24, NWS Austin/San Antonio, TX

March 28, 2018Medina County, Uvalde County, Zavala County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 28, 2018, 8:09 AM CDT for Medina County, Uvalde County, Zavala County, Texas. It was in force for 51 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: Mar 28, 2018, 8:09 AM CDT (13:09 UTC)
Expired: Mar 28, 2018, 9:00 AM CDT
In force: 51 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Medina County, TX, Uvalde County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 76 km from the middle of the area, began a volume at 13:11 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, 1.2 hours before the alert went out and 132 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: 307 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

848 
WUUS54 KEWX 281309
SVREWX
TXC325-463-507-281400-
/O.NEW.KEWX.SV.W.0024.180328T1309Z-180328T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
809 AM CDT WED MAR 28 2018

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  West central Medina County in south central Texas...
  Southeastern Uvalde County in south central Texas...
  Northeastern Zavala County in south central Texas...

* Until 900 AM CDT

* At 808 AM CDT, a severe thunderstorm was located 10 miles north of
  Batesville, moving northeast at 45 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...
  Sabinal.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.

&&

LAT...LON 2898 9958 2905 9969 2940 9949 2929 9921
TIME...MOT...LOC 1308Z 223DEG 40KT 2910 9957 

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

PLATT

1 follow-up statement

797 
WWUS54 KEWX 281320
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
820 AM CDT WED MAR 28 2018

TXC325-463-507-281400-
/O.CON.KEWX.SV.W.0024.000000T0000Z-180328T1400Z/
Medina TX-Uvalde TX-Zavala TX-
820 AM CDT WED MAR 28 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR WEST CENTRAL MEDINA...SOUTHEASTERN UVALDE AND NORTHERN ZAVALA
COUNTIES...

At 819 AM CDT, a severe thunderstorm was located 11 miles south of
Sabinal, or 16 miles northeast of Batesville, moving northeast at 40
mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Sabinal and Farm to Market Road 187. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2903 9952 2907 9962 2940 9949 2929 9921
TIME...MOT...LOC 1319Z 238DEG 34KT 2915 9946 

HAIL...1.75IN
WIND...60MPH
 
$$

PLATT

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 Mar 28, 6:38 AM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Mar 28, 6:38 AM CDT, 1 hour 31 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
638 AM CDT Wed Mar 28 2018

.AVIATION...
For KAUS, KSAT, KSSF, MVFR/IFR CIGs with VCSH/VCTS will persist this
morning into early afternoon, then lift to VFR. A round of VCTS/VCSH
is possible this evening as the upper level trough moves across. A
period of IFR, possibly LIFR CIGs/VSBYs is expected overnight into
Thursday morning, then VFR by midday on Thursday.

For KDRT, MVFR/IFR CIGs will become SCT and lift to VFR around midday
and persist through tonight.

&&

.PREV DISCUSSION... /ISSUED 320 AM CDT Wed Mar 28 2018/

SHORT TERM (Today through Thursday)...
The heavy rain threat continues across South Central Texas early
this morning while the threat for severe storms has diminished. A
Flash Flood Watch is in effect through this evening. The Severe
Thunderstorm Watch earlier issued from the Storm Prediction Center
has been allowed to expire as of 3 AM this morning.

An outflow boundary that moved through the area and into the coastal
plains Tuesday afternoon and evening, came back up into the I-35
corridor late Tuesday night and continues to do so early this
Wednesday morning. As this boundary continues to push northward, it
is expected to interact with a cold front pushing across Edwards
Plateau/western Hill Country. In addition, several upper level short
waves coming across northeast Mexico into the southwest part of
South Central Texas will help supporting more showers and
thunderstorms throughout the day.

As the cold front slowly pushes to the south this morning, several
rounds of heavy rain are possible in addition of strong to severe
thunderstorm development mainly east of I-35 corridor. Main severe
weather threats for today will be large hail and damaging winds in
addition to localized flash flooding due to heavy rain episodes.

Showers and thunderstorms continue this evening into Thursday
morning as the cold front finally pushes off into the coastal
waters.

New rainfall totals from today into Thursday morning range from one
to three quarter of an inch along the I-35 corridor and up to 1.5
inches across the coastal plains. One quarter inch and lesser amounts
are expected across the southern Edwards Plateau and Rio Grande.

By late Thursday morning, all precipitation should be far out from
the area with mostly sunny skies spreading from west to east with
highs in the 80s.

LONG TERM (Thursday Night through Tuesday)...
An upper level northwest to zonal flow will keep South Central Texas
dry for the latter part of the week into the weekend. There is a
slight chance for showers on Monday as a cold front approaches from
the north. The GFS solution keeps the area relative dry with some
drizzle in the morning while the ECM has a better signal for light
showers. At this time, we will go with slight chances for showers and
adjust weather grids accordindly with new model runs in future
forecast packages.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              73  57  82  53  75 /  70  20   0   0   0
Austin Bergstrom Intl Airport  74  56  82  51  75 /  70  30   0   0   0
New Braunfels Muni Airport     74  56  83  51  76 /  90  40   0   0   0
Burnet Muni Airport            70  52  78  49  73 /  50  10   0   0   0
Del Rio Intl Airport           80  54  86  54  81 /  10  -    0   0   0
Georgetown Muni Airport        72  54  80  50  73 /  60  10   0   0   0
Hondo Muni Airport             79  54  87  52  80 /  50  10   0   0   0
San Marcos Muni Airport        74  56  83  52  76 /  80  40   0   0   0
La Grange - Fayette Regional   77  59  82  53  76 /  90  80  10   0   0
San Antonio Intl Airport       77  57  84  53  77 /  80  30   0   0   0
Stinson Muni Airport           77  58  85  54  78 /  90  40   0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through this evening for Bastrop-Bexar-Blanco-
Burnet-Caldwell-Comal-Fayette-Gonzales-Guadalupe-Hays-Kendall-
Lavaca-Lee-Travis-Williamson-Wilson.

&&

Mesoscale/Aviation...04
Synoptic/Grids...17
Public Service/Data Collection...Williams

Hazardous weather outlook, Mar 28, 3:33 AM CDT, 4 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
333 AM CDT Wed Mar 28 2018

TXZ171>173-183>194-202>209-217>225-228-290915-
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-
333 AM CDT Wed Mar 28 2018

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

.DAY ONE...Today And Tonight.

Showers and thunderstorms will continue today and slowly push off
to the east tonight into early Thursday. Locally heavy rains are
the main threat and flash flooding can be expected mainly across
eastern areas and urban areas. Isolated strong to severe storms
are also possible with large hail up to quarter sized and
damaging straight-line winds up to 60 mph the primary threats.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter are encouraged to submit rainfall, hail, and wind reports.

In the hours before

Local storm report, Mar 28, 5:34 AM CDT, 2 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
534 AM CDT WED MAR 28 2018

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

0533 AM     FLASH FLOOD      1 NNE KYLE              30.00N 97.87W
03/28/2018                   HAYS               TX   LAW ENFORCEMENT

            ROAD CLOSURES DUE TO FLOODING ACROSS THE
            CITY OF KYLE.

&&

BMW

Local storm report, Mar 28, 5:48 AM CDT, 2 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
548 AM CDT WED MAR 28 2018

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

0546 AM     FLASH FLOOD      LOST CREEK              30.30N 97.84W
03/28/2018                   TRAVIS             TX   TRAINED SPOTTER

            NUMEROUS LOW WATER CROSSINGS CLOSED ACROSS
            TRAVIS COUNTY AND THE CITY OF AUSTIN.

&&

BMW

Local storm report, Mar 28, 6:17 AM CDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
617 AM CDT WED MAR 28 2018

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

0615 AM     HEAVY RAIN       3 W KYLE                29.98N 97.92W
03/28/2018  M4.66 INCH       HAYS               TX   OTHER FEDERAL

            USGS RAIN GAUGE AT BLANCO RIVER NEAR KYLE
            REPORTS 4.66 INCHES OF RAIN SINCE MIDNIGHT.

&&

BMW

Local storm report, Mar 28, 7:20 AM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
720 AM CDT WED MAR 28 2018

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

0719 AM     HEAVY RAIN       2 SW BERGSTROM INTERNAT 30.18N 97.69W
03/28/2018  M4.35 INCH       TRAVIS             TX   MESONET

            LCRA HYDROMET SITE AT ONION CREEK AND US 183
            REPORTS 4.35 INCHES OF RAIN SINCE MIDNIGHT.

&&

BMW

Local storm report, Mar 28, 7:34 AM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
734 AM CDT WED MAR 28 2018

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

0733 AM     FLASH FLOOD      5 WNW COUPLAND          30.48N 97.46W
03/28/2018                   WILLIAMSON         TX   EMERGENCY MNGR

            WILLIAMSON COUNTY EM REPORTS ADDITIONAL ROAD
            CLOSURES DUE TO HIGH WATER ACROSS THE
            COUNTY.

&&

BMW

Special weather statement, Mar 28, 7:57 AM CDT, 12 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
757 AM CDT WED MAR 28 2018

TXZ203-218-281345-
Uvalde TX-Zavala TX-
757 AM CDT WED MAR 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN UVALDE AND NORTH
CENTRAL ZAVALA COUNTIES UNTIL 845 AM CDT...

At 754 AM CDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Batesville, moving northeast at 40 mph.

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

Locations impacted include...
Uvalde, La Pryor, Batesville, Sabinal, Knippa and U.S. Highway 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2893 9986 2944 9971 2931 9941 2886 9970
TIME...MOT...LOC 1254Z 224DEG 38KT 2906 9966

PLATT

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 7:56 PM CDT	Flash Flood Watch	EWX	Bastrop, Bexar, Blanco, Burnet, Caldwell, Comal and 10 more	23 hr
Mar 27, 10:13 PM CDT	Special Weather Statement	EWX	Dimmit	47 min
Mar 27, 10:30 PM CDT	Special Weather Statement	EWX	Medina	45 min
Mar 27, 11:15 PM CDT	Special Weather Statement	EWX	Medina	30 min
Mar 27, 11:17 PM CDT	Special Weather Statement	EWX	Medina	43 min
Mar 27, 11:46 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick	59 min
Mar 27, 11:52 PM CDT	Severe Thunderstorm Warning	EWX	Frio	53 min
Mar 27, 11:55 PM CDT	Areal Flood Advisory	EWX	Medina, Uvalde	3 hr
Mar 27, 11:56 PM CDT	Special Weather Statement	EWX	Bandera	64 min
Mar 28, 12:08 AM CDT	Special Weather Statement	EWX	Val Verde	52 min
Mar 28, 12:21 AM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Medina	39 min
Mar 28, 12:34 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit	41 min
Mar 28, 12:44 AM CDT	Special Weather Statement	EWX	Gillespie	46 min
Mar 28, 1:05 AM CDT	Special Weather Statement	EWX	Llano	40 min
Mar 28, 1:26 AM CDT	Special Weather Statement	EWX	Maverick	49 min
Mar 28, 1:36 AM CDT	Areal Flood Advisory	EWX	Bexar, Medina	3 hr
Mar 28, 2:02 AM CDT	Special Weather Statement	EWX	Comal	28 min
Mar 28, 2:25 AM CDT	Areal Flood Advisory	EWX	Blanco, Comal, Hays, Kendall	3 hr
Mar 28, 2:38 AM CDT	Special Weather Statement	EWX	Dimmit	37 min
Mar 28, 2:40 AM CDT	Flash Flood Warning	EWX	Bexar, Medina	6 hr
Mar 28, 3:12 AM CDT	Areal Flood Advisory	EWX	Comal, Hays, Travis	3 hr
Mar 28, 3:56 AM CDT	Flash Flood Warning	EWX	Comal, Hays, Travis, Williamson	6 hr
Mar 28, 4:12 AM CDT	Areal Flood Advisory	EWX	Bexar, Guadalupe, Wilson	3 hr
Mar 28, 4:51 AM CDT	Tornado Warning	EWX	Caldwell	24 min
Mar 28, 7:34 AM CDT	River Flood Warning	EWX	Travis	15 hr
Mar 28, 7:57 AM CDT	Special Weather Statement	EWX	Uvalde	48 min
Mar 28, 8:33 AM CDT	Severe Thunderstorm Warning	EWX	Medina	42 min
Mar 28, 8:48 AM CDT	Flash Flood Warning	EWX	Medina	3 hr
Mar 28, 9:16 AM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Medina	59 min
Mar 28, 9:55 AM CDT	Flash Flood Warning	EWX	Bexar, Comal, Guadalupe	5 hr
Mar 28, 10:16 AM CDT	Special Weather Statement	EWX	Bexar	44 min
Mar 28, 10:39 AM CDT	Flash Flood Warning	EWX	Bastrop, Caldwell, Comal, Guadalupe, Hays, Travis and 1 more	3 hr
Mar 28, 10:57 AM CDT	Special Weather Statement	EWX	Guadalupe	48 min
Mar 28, 10:59 AM CDT	River Flood Warning	EWX	Bexar	7 hr
Mar 28, 11:40 AM CDT	Special Weather Statement	EWX	Caldwell	50 min
Mar 28, 2:17 PM CDT	River Flood Warning	EWX	Bexar, Wilson	34 hr
Mar 28, 2:42 PM CDT	River Flood Warning	EWX	Bexar	18 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every severe thunderstorm warning 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.