Alert archive / Texas / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 123, NWS Fort Worth, TX

April 21, 20165 counties in Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 21, 2016, 3:51 AM CDT for 5 counties in Texas. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 21, 2016, 3:51 AM CDT (08:51 UTC)
Expired: Apr 21, 2016, 4:45 AM CDT
In force: 54 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bosque County, TX, Comanche County, TX, Erath County, TX, Hamilton County, TX, Somervell County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 95 km from the middle of the area, began a volume at 08:50 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

Midland Regional, TX (KMAF), launched 00:00Z, 8.9 hours before the alert went out and 391 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2940 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 11:56 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, Apr 20, 11:56 PM CDT, 3 hours 55 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, Apr 20, 9:59 PM CDT, 5 hours 52 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

Special weather statement, Apr 21, 3:12 AM CDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
312 AM CDT THU APR 21 2016

TXZ118-119-210915-
DALLAS TX-TARRANT TX-
312 AM CDT THU APR 21 2016

...SIGNIFICANT WEATHER ADVISORY FOR DALLAS AND TARRANT COUNTIES UNTIL
415 AM CDT...

AT 312 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
RICHLAND HILLS...MOVING EAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
DALLAS...FORT WORTH...ARLINGTON...GARLAND...IRVING...GRAND PRAIRIE...
MESQUITE...CARROLLTON...RICHARDSON...MANSFIELD...ROWLETT...EULESS...DESOTO...
BEDFORD...GRAPEVINE...CEDAR HILL...HALTOM CITY...KELLER...COPPELL AND
DUNCANVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3298 9652 3255 9652 3255 9755 3299 9754
TIME...MOT...LOC 0812Z 276DEG 30KT 3278 9722

30

Special weather statement, Apr 21, 3:23 AM CDT, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
323 AM CDT THU APR 21 2016

TXZ130-141-143-210915-
COMANCHE TX-HAMILTON TX-ERATH TX-
323 AM CDT THU APR 21 2016

...SIGNIFICANT WEATHER ADVISORY FOR COMANCHE AND ERATH COUNTIES UNTIL
415 AM CDT...

AT 321 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
DE LEON...OR 7 MILES NORTHWEST OF DUBLIN...MOVING EAST AT 35 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
STEPHENVILLE...COMANCHE...DUBLIN...DE LEON...HICO...GUSTINE...HUCKABAY AND
MORGAN MILL.

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 3230 9847 3251 9847 3251 9807 3209 9786
      3202 9800 3193 9794 3197 9811 3192 9821
      3184 9816 3169 9846 3172 9850 3170 9867
      3208 9892
TIME...MOT...LOC 0821Z 282DEG 29KT 3215 9845

30

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 2:27 AM CDT	Areal Flood Advisory	FWD	Eastland	3 hr
Apr 21, 3:12 AM CDT	Special Weather Statement	FWD	Dallas, Tarrant	63 min
Apr 21, 3:23 AM CDT	Special Weather Statement	FWD	Comanche, Erath	52 min
Apr 21, 3:29 AM CDT	Tornado Warning	FWD	Comanche, Erath, Hamilton	31 min
Apr 21, 4:04 AM CDT	Areal Flood Advisory	FWD	Bosque, Comanche, Erath, Hamilton, Hill, Hood and 2 more	3 hr
Apr 21, 4:12 AM CDT	River Flood Warning	FWD	Tarrant	27 hr
Apr 21, 4:44 AM CDT	Special Weather Statement	FWD	Bell, Bosque, Coryell, Hill, Lampasas, McLennan	61 min
Apr 21, 5:32 AM CDT	Areal Flood Advisory	FWD	Bell, Coryell, McLennan	3 hr
Apr 21, 5:48 AM CDT	Special Weather Statement	FWD	Bell, Falls, Limestone, Milam	72 min
Apr 21, 7:04 AM CDT	River Flood Warning	FWD	Comanche	20 hr
Apr 21, 7:25 AM CDT	Special Weather Statement	FWD	Leon	35 min
Apr 21, 2:24 PM CDT	River Flood Warning	FWD	Tarrant	5 days

Nearby

Severe Thunderstorm Warnings in Texas, 2016 Every severe thunderstorm warning in 2016

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.