Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 12, NWS Amarillo, TX

April 21, 2020Hemphill County, Roberts County, Wheeler County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 21, 2020, 7:54 PM CDT for Hemphill County, Roberts County, Wheeler County, Texas. It was in force for 66 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, 2020, 7:54 PM CDT (00:54 UTC)
Expired: Apr 21, 2020, 9:00 PM CDT
In force: 66 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, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 125 km from the middle of the area, began a volume at 00:56 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.

Issued	Product	Office	Lasted
Apr 21, 3:11 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.9 hours before the alert went out and 124 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: 262 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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 Apr 21, 6:33 PM CDT, 1 hour 21 minutes earlier.

Area forecast discussion, Apr 21, 6:33 PM CDT, 1 hour 21 minutes before

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Hazardous weather outlook, Apr 21, 3:14 PM CDT, 4 hours 40 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Amarillo TX
314 PM CDT Tue Apr 21 2020

OKZ001>003-TXZ001>020-317-220815-
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-
314 PM CDT Tue Apr 21 2020

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

.DAY ONE...This Afternoon and Tonight.

Isolated to scattered thunderstorms are expected this afternoon
and tonight across the combined Panhandles, favoring the northern
and eastern parts of the region. The strongest storms could
become severe with large hail and strong winds being the main
threats. The chance for tornadoes can't be ruled out this
afternoon and evening. Large hail becomes the main threat
overnight. A Severe Thunderstorm Watch is in effect until 10 PM
CDT this evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Additional thunderstorms will be possible going into Wednesday,
and then again Thursday night through Friday across most of the
Oklahoma and Texas Panhandles. Severe storms can't be ruled out
early Wednesday morning in the eastern Panhandles, but otherwise
severe weather is not expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is needed for this afternoon through tonight.

Schneider

In the hours before

Special weather statement, Apr 21, 6:06 PM CDT, 1 hour 48 minutes before

Special Weather Statement
National Weather Service Amarillo TX
606 PM CDT Tue Apr 21 2020

TXZ003-004-008-009-212330-
Hutchinson TX-Ochiltree TX-Roberts TX-Hansford TX-
606 PM CDT Tue Apr 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN HUTCHINSON...
SOUTHEASTERN HANSFORD...NORTHWESTERN ROBERTS AND SOUTHWESTERN
OCHILTREE COUNTIES UNTIL 630 PM CDT...

At 606 PM CDT, Doppler radar was tracking two strong thunderstorms,
the first 7 miles southwest of Spearman and the second near Pringle.
Both were moving east at 30 mph.

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

Locations impacted include...
Spearman, Morse and Pringle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
the Panhandle of Texas.

LAT...LON 3576 10107 3594 10162 3598 10162 3633 10133
      3622 10079
TIME...MOT...LOC 2306Z 271DEG 28KT 3612 10130 3595 10142

Ferguson

Local storm report, Apr 21, 7:01 PM CDT, 53 minutes before

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Local storm report, Apr 21, 7:05 PM CDT, 49 minutes before

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Local storm report, Apr 21, 7:37 PM CDT, 17 minutes before

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Local storm report, Apr 21, 7:47 PM CDT, 7 minutes before

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Local storm report, Apr 21, 7:51 PM CDT, 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 7:06 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Roberts	54 min
Apr 21, 7:11 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill	49 min
Apr 21, 7:39 PM CDT	Areal Flood Advisory	AMA	Hemphill, Roberts	111 min
Apr 21, 9:59 PM CDT	Special Weather Statement	AMA	Lipscomb	46 min
Apr 22, 1:31 AM CDT	Special Weather Statement	AMA	Oldham	29 min
Apr 22, 1:55 AM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	50 min
Apr 22, 2:43 AM CDT	Severe Thunderstorm Warning	AMA	Hutchinson, Moore	47 min
Apr 22, 3:15 AM CDT	Severe Thunderstorm Warning	AMA	Hutchinson, Moore	60 min
Apr 22, 3:41 AM CDT	Special Weather Statement	AMA	Hemphill	49 min
Apr 22, 3:51 AM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts	54 min
Apr 22, 4:12 AM CDT	Severe Thunderstorm Warning	AMA	Gray, Roberts	48 min
Apr 22, 4:44 AM CDT	Special Weather Statement	AMA	Lipscomb	61 min
Apr 22, 5:02 AM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb, Ochiltree, Roberts	37 min
Apr 22, 1:31 PM CDT	Special Weather Statement	AMA	Hemphill	59 min
Apr 22, 2:15 PM CDT	Special Weather Statement	AMA	Wheeler	60 min
Apr 22, 6:08 PM CDT	Special Weather Statement	AMA	Oldham	67 min
Apr 22, 2:30 AM CDT	Special Weather Statement	AMA	Texas	60 min

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.