Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 45, NWS San Angelo, TX

April 11, 2020Shackelford County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 11, 2020, 7:38 PM CDT for Shackelford County, Texas. It was in force for 37 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 11, 2020, 7:38 PM CDT (00:38 UTC)
Expired
Apr 11, 2020, 8:15 PM CDT
In force
37 min
Issued by
NWS San Angelo, TX
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

County Shackelford County, TX

The radar

The Dyess AFB radar (KDYX), 24 km from the middle of the area, began a volume at 00:42 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 watch it was issued in

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

IssuedProductOfficeLasted
Apr 11, 2:02 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.6 hours before the alert went out and 193 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 509 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
509 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.5
Supercell composite
10.7

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 11, 6:29 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Apr 11, 6:29 PM CDT, 1 hour 9 minutes before
Area Forecast Discussion
National Weather Service San Angelo TX
629 PM CDT Sat Apr 11 2020

.AVIATION...
/00Z TAFS/

Chances for brief thunderstorms this evening for most terminals,
followed by another round between 04-08Z. VFR outside of
thunderstorms. Rapid wind shifts expected in and during
thunderstorms with large hail and strong winds possible.
Thunderstorm threat ends by 12Z, but strong winds expected through
the day.

SK

&&

.PREV DISCUSSION... /issued 328 PM CDT Sat Apr 11 2020/

SHORT TERM...
(Tonight)

..Severe Thunderstorms...

Look for thunderstorms this afternoon and tonight, as another
upper disturbance moves over the region. The Storm Prediction
Center has all of West Central Texas in an Enhanced Risk Area,
through sunrise Sunday morning. The main hazards are tornadoes,
very large hail, damaging winds, and deadly lightning.

(Sunday)

..Breezy and Another Cold Front...

As another cold front, this one unusually strong for mid April,
moves closer to West Central Texas, gusty winds, from the west,
will develop Sunday. Then, the cold front may begin to move into
the Big Country, by mid afternoon. Although this front will be a
dry front, it will bring gusty winds from the north, along with
uncharacteristically cold temperatures, for mid April.

LONG TERM...
(Sunday night through Saturday)

..Much Cooler Temperatures then a Warmup...

Much cooler temperatures will dominate through mid week, before a
warming trend begins. Overnight lows Monday night, likely in the
mid to upper 30s, will be unusually cold, for mid April. Plus, the
wind chill Monday night, may be in the mid to upper 20s. Cooler
than usual temperatures will continue until Wednesday; then, a
warming trend will push temperatures back above usual mid April
temperatures for Friday and Saturday.

&&

.PRELIMINARY POINT TEMPS/POPS...
Abilene 	 56  77  35  54 /  60   0   0   0
San Angelo 	 55  80  38  61 /  50   0   0   0
Junction 	 57  79  40  63 /  80   0   0   0
Brownwood 	 58  77  36  57 /  80   5   0   0
Sweetwater 	 54  77  35  54 /  50   0   0   0
Ozona      	 54  80  40  64 /  50   0   0   0

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
None.
&&

99/99/99
Hazardous weather outlook, Apr 11, 2:48 PM CDT, 4 hours 50 minutes before
Hazardous Weather Outlook
National Weather Service San Angelo TX
248 PM CDT Sat Apr 11 2020

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-122000-
Fisher-Nolan-Sterling-Coke-Runnels-Irion-Tom Green-Concho-
Crockett-Schleicher-Sutton-Haskell-Throckmorton-Jones-Shackelford-
Taylor-Callahan-Coleman-Brown-McCulloch-San Saba-Menard-Kimble-
Mason-
248 PM CDT Sat Apr 11 2020

This Hazardous Weather Outlook is for portions of west central
Texas.

.DAY ONE...This Afternoon and Tonight

Expect severe thunderstorms. Hazards include tornadoes, very
large hail, damaging winds, and ever-present deadly lightning.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The threat for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...
We will likely need spotters this afternoon and evening. Please
relay any information about observed weather to the NWS, while
following all local, state, and CDC guidelines.

In the hours before

Special weather statement, Apr 11, 5:36 PM CDT, 2 hours 2 minutes before
Special Weather Statement
National Weather Service San Angelo TX
536 PM CDT Sat Apr 11 2020

TXZ098-099-112315-
Haskell TX-Throckmorton TX-
536 PM CDT Sat Apr 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN HASKELL AND
NORTHWESTERN THROCKMORTON COUNTIES UNTIL 615 PM CDT...

At 535 PM CDT, Doppler radar was tracking a strong thunderstorm near
Weinert, or 8 miles northeast of Haskell, moving east at 30 mph.

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

This strong thunderstorm will be near...
  Irby around 550 PM CDT.
  Millers Creek Reservoir around 610 PM CDT.

Other locations impacted by this storm include Us-
183 Near The Throckmorton-Baylor County Line.

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.

&&

A Tornado Watch remains in effect until 1000 PM CDT for west central
Texas.

LAT...LON 3320 9910 3315 9972 3333 9977 3340 9944
      3340 9914
TIME...MOT...LOC 2235Z 257DEG 24KT 3327 9966
Local storm report, Apr 11, 6:12 PM CDT, 1 hour 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
612 PM CDT SAT APR 11 2020

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

0545 PM     TSTM WND GST     3 WSW SAN ANGELO        31.43N 100.51W
04/11/2020  E60 MPH          TOM GREEN          TX   NWS EMPLOYEE

            OFF DUTY NWS EMPLOYEE REPORTS 60 MPH WIND
            GUSTS AND PEA SIZE HAIL.

&&
Local storm report, Apr 11, 6:14 PM CDT, 1 hour 24 minutes before
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Local storm report, Apr 11, 6:30 PM CDT, 1 hour 8 minutes before
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Special weather statement, Apr 11, 6:53 PM CDT, 45 minutes before
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Special weather statement, Apr 11, 7:33 PM CDT, 5 minutes before
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The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 7:08 PM CDTSevere Thunderstorm WarningSJTIrion, Tom Green52 min
Apr 11, 7:10 PM CDTSevere Thunderstorm WarningSJTShackelford, Throckmorton35 min
Apr 11, 7:33 PM CDTSpecial Weather StatementSJTRunnels42 min
Apr 11, 7:52 PM CDTSevere Thunderstorm WarningSJTConcho, Tom Green36 min
Apr 11, 8:26 PM CDTSpecial Weather StatementSJTConcho49 min
Apr 11, 9:04 PM CDTSpecial Weather StatementSJTSterling41 min
Apr 11, 10:37 PM CDTSpecial Weather StatementSJTCrockett38 min
Apr 11, 11:30 PM CDTSpecial Weather StatementSJTCrockett45 min
Apr 12, 12:18 AM CDTSpecial Weather StatementSJTCrockett42 min
Apr 12, 1:07 AM CDTSevere Thunderstorm WarningSJTCrockett, Schleicher53 min
Apr 12, 1:28 AM CDTSevere Thunderstorm WarningSJTCrockett62 min
Apr 12, 1:34 AM CDTSpecial Weather StatementSJTConcho41 min
Apr 12, 1:35 AM CDTTornado WarningSJTCrockett, Schleicher, Sutton25 min
Apr 12, 1:58 AM CDTSevere Thunderstorm WarningSJTSchleicher, Sutton, Tom Green62 min
Apr 12, 2:13 AM CDTTornado WarningSJTSchleicher13 min
Apr 12, 2:15 AM CDTSpecial Weather StatementSJTConcho45 min
Apr 12, 2:19 AM CDTSevere Thunderstorm WarningSJTCrockett56 min
Apr 12, 2:20 AM CDTSpecial Weather StatementSJTFisher40 min
Apr 12, 2:37 AM CDTAreal Flood AdvisorySJTTom Green2 hr
Apr 12, 2:40 AM CDTSpecial Weather StatementSJTCoke, Crockett, Irion, Sterling50 min
Apr 12, 3:01 AM CDTSevere Thunderstorm WarningSJTCoke, Crockett, Irion, Runnels, Schleicher, Sterling and 1 more59 min
Apr 12, 3:02 AM CDTSevere Thunderstorm WarningSJTConcho, Menard, Schleicher, Tom Green58 min
Apr 12, 3:22 AM CDTSpecial Weather StatementSJTCoke, Nolan38 min
Apr 12, 3:36 AM CDTSevere Thunderstorm WarningSJTConcho, McCulloch, Menard54 min
Apr 12, 3:50 AM CDTTornado WarningSJTConcho, McCulloch25 min
Apr 12, 4:02 AM CDTSpecial Weather StatementSJTColeman, Runnels43 min
Apr 12, 4:08 AM CDTTornado WarningSJTMcCulloch31 min
Apr 12, 4:13 AM CDTSevere Thunderstorm WarningSJTBrown, Coleman, McCulloch, San Saba48 min
Apr 12, 4:47 AM CDTSpecial Weather StatementSJTBrown, Coleman, McCulloch43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.