Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 200, NWS Amarillo, TX

August 16, 2020Hemphill County, Roberts County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 16, 2020, 1:53 PM CDT for Hemphill County, Roberts County, Texas. It was in force for 67 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: Aug 16, 2020, 1:53 PM CDT (18:53 UTC)
Expired: Aug 16, 2020, 3:00 PM CDT
In force: 67 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hemphill County, TX, Roberts County, TX

The radar

The Amarillo radar (KAMA), 125 km from the middle of the area, began a volume at 18:53 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 6.9 hours before the alert went out and 125 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: 417 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 2353 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: -23 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 Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 16, 1:01 PM CDT, 52 minutes earlier.

Area forecast discussion, Aug 16, 1:01 PM CDT, 52 minutes before

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Hazardous weather outlook, Aug 16, 3:38 AM CDT, 10 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
338 AM CDT Sun Aug 16 2020

OKZ001>003-TXZ001>020-317-162045-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
Palo Duro Canyon-
338 AM CDT Sun Aug 16 2020

This Hazardous Weather Outlook is for the Texas and Oklahoma
Panhandles.

.DAY ONE...Today and Tonight.

Thunderstorms possible today. Storms may become severe with
damaging winds and large hail being the main threats.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Thunderstorms are possible just about every day through Friday,
mainly during the evening and overnight periods. Current severe
threat is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

In the hours before

Special weather statement, Aug 16, 12:58 PM CDT, 55 minutes before

Special Weather Statement
National Weather Service Amarillo TX
1258 PM CDT Sun Aug 16 2020

OKZ003-161900-
Beaver OK-
1258 PM CDT Sun Aug 16 2020

...SIGNIFICANT WEATHER ADVISORY FOR BEAVER COUNTY UNTIL 200 PM CDT...

At 1258 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles west of Knowles, or 12 miles east of Beaver, moving southeast
at 30 mph.

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

Locations impacted include...
Beaver, Forgan, Gate, Knowles, Mocane, Slapout and Floris.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

LAT...LON 3650 10000 3654 10035 3667 10061 3700 10094
      3700 10001
TIME...MOT...LOC 1758Z 306DEG 25KT 3685 10031

Guerrero

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 2:28 PM CDT	Severe Thunderstorm Warning	AMA	Roberts	62 min
Aug 16, 2:43 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	92 min
Aug 16, 2:45 PM CDT	Tornado Warning	AMA	Gray, Wheeler	19 min
Aug 16, 3:23 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	47 min
Aug 16, 3:55 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley	13 min
Aug 16, 4:09 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley	53 min
Aug 16, 12:58 PM CDT	Special Weather Statement	AMA	Beaver	62 min
Aug 16, 3:25 PM CDT	Special Weather Statement	AMA	Cimarron	35 min
Aug 16, 4:00 PM CDT	Special Weather Statement	AMA	Cimarron	60 min
Aug 16, 6:54 PM CDT	Areal Flood Advisory	AMA	Beaver	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every 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.