Alert archive / Texas / Special Weather Statements in 2018

Special Weather Statement, NWS Austin/San Antonio, TX

May 20, 2018Edwards County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 20, 2018, 12:20 PM CDT for Edwards County, Texas. It was in force for 55 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 20, 2018, 12:20 PM CDT (17:20 UTC)
Expired: May 20, 2018, 1:15 PM CDT
In force: 55 min
Issued by: NWS Austin/San Antonio, TX

County Edwards County, TX

The radar

The Laughlin AFB radar (KDFX), 67 km from the middle of the area, began a volume at 17:22 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

Del Rio, TX (KDLF), launched 12:00Z, 5.3 hours before the alert went out and 46 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: 1390 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

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 May 20, 7:49 AM CDT, 4 hours 31 minutes earlier.

Area forecast discussion, May 20, 7:49 AM CDT, 4 hours 31 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, May 20, 5:27 AM CDT, 6 hours 53 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Local storm report, May 20, 9:09 AM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
909 AM CDT SUN MAY 20 2018

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

0841 AM     TORNADO          3 NE LEANDER            30.60N 97.82W
05/20/2018                   WILLIAMSON         TX   AMATEUR RADIO

            AMATEUR RADIO OPERATOR REPORTS SHINGLE
            DAMAGE TO A HOME, AN ABOVE GROUND POOL
            DEMOLISHED, AND A TREE DOWN AT 3336 HERO WAY
            IN LEANDER, TX.

&&

TB3

Local storm report, May 20, 9:18 AM CDT, 3 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
918 AM CDT SUN MAY 20 2018

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

0843 AM     TORNADO          5 E LIBERTY HILL        30.66N 97.84W
05/20/2018                   WILLIAMSON         TX   EMERGENCY MNGR

            WILLIAMSON COUNTY EMC REPORTS TREE DAMAGE AT
            THE SANTA RITA RANCH NORTH SUBDIVISION OFF
            OF RONALD REAGAN BLVD.

&&

TB3

Local storm report, May 20, 9:21 AM CDT, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
921 AM CDT SUN MAY 20 2018

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

0841 AM     TORNADO          3 NE LEANDER            30.59N 97.82W
05/20/2018                   WILLIAMSON         TX   TRAINED SPOTTER

            REPORT OF ROOF DAMAGE TO THREE STRUCTURES AT
            3450 HERO WAY IN LEANDER, TX.

&&

TB3

Local storm report, May 20, 11:37 AM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1137 AM CDT SUN MAY 20 2018

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

1130 AM     HAIL             3 SE CYPRESS MILL       30.34N 98.22W
05/20/2018  E0.25 INCH       BLANCO             TX   TRAINED SPOTTER

&&

Special weather statement, May 20, 12:20 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
1220 PM CDT SUN MAY 20 2018

TXZ183-184-202-201815-
Kinney TX-Val Verde TX-Edwards TX-
1220 PM CDT SUN MAY 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN KINNEY...
SOUTHWESTERN EDWARDS AND EAST CENTRAL VAL VERDE COUNTIES UNTIL 115 PM
CDT...

At 1220 PM CDT, Doppler radar was tracking a strong thunderstorm near
Carta Valley, or 9 miles southeast of Loma Alta, moving southeast at
25 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Carta Valley and U.S. Highway 377.

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.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 2976 10086 2997 10071 2983 10028 2949 10069
TIME...MOT...LOC 1720Z 309DEG 22KT 2984 10065

PLATT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:33 AM CDT	Tornado Warning	EWX	Williamson	27 min
May 20, 10:47 AM CDT	Areal Flood Advisory	EWX	Burnet	3 hr
May 20, 12:09 PM CDT	Areal Flood Advisory	EWX	Val Verde	3 hr
May 20, 12:56 PM CDT	Flash Flood Warning	EWX	Edwards, Val Verde	3 hr
May 20, 1:03 PM CDT	Special Weather Statement	EWX	Kinney	42 min
May 20, 1:04 PM CDT	Areal Flood Advisory	EWX	Comal, Hays	116 min
May 20, 1:32 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Uvalde	58 min
May 20, 1:39 PM CDT	Areal Flood Advisory	EWX	Bastrop, Travis	3 hr
May 20, 1:59 PM CDT	Areal Flood Advisory	EWX	Kinney	2 hr
May 20, 2:31 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	59 min
May 20, 3:14 PM CDT	Areal Flood Advisory	EWX	Uvalde	3 hr
May 20, 3:30 PM CDT	Special Weather Statement	EWX	Medina	60 min
May 20, 4:01 PM CDT	Areal Flood Advisory	EWX	Medina	3 hr
May 20, 4:07 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Lavaca	3 hr
May 20, 5:10 PM CDT	Areal Flood Advisory	EWX	Atascosa, Bexar, Karnes, Wilson	4 hr
May 20, 5:10 PM CDT	Special Weather Statement	EWX	Atascosa	50 min
May 20, 5:31 PM CDT	Special Weather Statement	EWX	Bexar	44 min
May 20, 5:56 PM CDT	Special Weather Statement	EWX	Atascosa, Wilson	49 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.