Alert archive / Texas / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 326, NWS Amarillo, TX

July 10, 2019Dallam County, Hartley County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 10, 2019, 6:48 PM CDT for Dallam County, Hartley County, Texas. It was in force for 34 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: Jul 10, 2019, 6:48 PM CDT (23:48 UTC)
Expired: Jul 10, 2019, 7:22 PM CDT
In force: 34 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Dallam County, TX, Hartley County, TX

The radar

The Amarillo radar (KAMA), 122 km from the middle of the area, began a volume at 23:48 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, 11.8 hours before the alert went out and 123 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: 879 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 2427 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 85 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 Jul 10, 6:46 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 10, 6:46 PM CDT, 2 minutes before

Area Forecast Discussion
National Weather Service Amarillo TX
646 PM CDT Wed Jul 10 2019

.AVIATION...
For the 00z TAFs...
Scattered thunderstorms continuing at this time over mainly
western half of Texas Panhandle, potentially impacting AMA and DHT
for the next few hours.  VFR conditions expected to prevail at
all terminals next 24 hours, apart from brief visibility
reductions in thunderstorms.  Generally light to moderate surface
wind expected next 24 hours, apart from thunderstorm outflows.
Amendments may be needed due to advancing outflow boundaries
causing surface wind shifts.

Cockrell

&&

.PREV DISCUSSION... /Issued 301 PM CDT Wed Jul 10 2019/

SHORT TERM...Tonight and Tomorrow...

Storms had already formed across southwest Armstrong and southeast
Randall County earlier. As expected the developed along a boundary
and pulsed up to severe, and down after about 10 to 15 minutes at
their peak.  18Z sounding indicates plenty of unstable air to work
with aloft, however outflow from the storms have come in and knocked
back the dewpoints a bit as well as the temperature.  Therefore, it
may be difficult to convect over the Amarillo area.  Dewpoints are
still high enough and there's still plenty of daytime heating that
other storms could still develop and will have the potential to
become severe. But again, they will likely be short lived in nature.
Hail and wind will be the main threat, but if the storm develops
along the frontal boundary, there's a low chance of a tornado
threat.

Storms will still have the potential to carry on through the evening
and overnight given the outflow boundaries that they can create,
forcing new updrafts to form nearby and therefore at least a slight
chance of storms has been carried over to the overnight and early
morning hours for Thursday.  Very low chance for storms on Thursday
as the ridge sets up over the Panhandles.  Right now have kept them
out of the forecast, but may need to go isolated with later updates.

Given the high temperatures today and the very high dewpoints (by
Panhandle Standards) Heat Indices are in the 100+ range off the
Caprock, and a couple of hot spots like Collingsworth County and
(earlier) the Palo Duro Canyon floor reached 110 and therefore a
Heat Advisory was issued until 8 PM this evening.  Now the Palo Duro
Canyon Floor will need to be watched as a storm developed over the
area and the cool outflow shut down the high Heat Index, but there's
still more time in the day for that area to recover and heat up
again, so not canceling that Advisory just yet.

Weber

LONG TERM...Tomorrow Night through Tuesday Night...

A turn to less active weather is expected in the long term. By
Thursday night, 595dm 500mb upper high will be located over CO/NM,
with only slight discrepancies in placement seen at this point
between sources of guidance. This will lead to temperatures being
just a bit above average through much of the extended forecast.
While guidance begins to diverge on the location and strength of the
ridge by Monday, all agree that upper ridging will continue to be
present through the end of the seven day forecast, generally to our
west over NM/CO. Some hints at a few northwest flow events in
guidance, but the position of the ridge is not promising for extra
moisture sneaking in from the Pacific, so have kept the low PoPs
from the previous forecast going.

Ferguson

AVIATION...18Z TAFs...

VFR conditions will prevail at all TAF sites. There's a chance for
MVFR conditions to occur given the thunderstorm potential. But
have only go VCTS for the TAF sites, as it's too difficult to
pinpoint a time that they will be over the TAF site. So will make
amendments as needed for the storms. Winds will generally be out
of the north for most of the TAF period, and in the 10 to 15kt
range.

Weber

&&

.AMA Watches/Warnings/Advisories...
TX...Heat Advisory until 8 PM CDT this evening for the following
     zones: Collingsworth.

OK...None.

&&

03/14

Hazardous weather outlook, Jul 10, 6:18 PM CDT, 30 minutes before

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In the hours before

Special weather statement, Jul 10, 2:51 PM CDT, 3 hours 57 minutes before

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Special weather statement, Jul 10, 3:26 PM CDT, 3 hours 22 minutes before

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Special weather statement, Jul 10, 4:02 PM CDT, 2 hours 46 minutes before

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Special weather statement, Jul 10, 4:58 PM CDT, 1 hour 50 minutes before

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Local storm report, Jul 10, 5:29 PM CDT, 1 hour 19 minutes before

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Local storm report, Jul 10, 5:29 PM CDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
529 PM CDT WED JUL 10 2019

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

0523 PM     HAIL             VALLEY DE ORO           35.45N 102.11W
07/10/2019  M1.00 INCH       POTTER             TX   PUBLIC

            QUARTER SIZED HAIL, WITH LARGER STONES BEGINNING TO
            FALL.

&&

EVENT NUMBER AMA1901046

14

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:25 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Roberts	48 min
Jul 10, 11:41 AM CDT	Heat Advisory	AMA	Collingsworth, Randall	8 hr
Jul 10, 12:38 PM CDT	Special Weather Statement	AMA	Armstrong	37 min
Jul 10, 12:50 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Randall	25 min
Jul 10, 12:58 PM CDT	Tornado Warning	AMA	Armstrong	32 min
Jul 10, 1:14 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Randall	46 min
Jul 10, 1:30 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Randall	30 min
Jul 10, 2:51 PM CDT	Special Weather Statement	AMA	Randall	24 min
Jul 10, 3:10 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Randall	36 min
Jul 10, 3:26 PM CDT	Special Weather Statement	AMA	Deaf Smith	19 min
Jul 10, 4:02 PM CDT	Special Weather Statement	AMA	Deaf Smith	28 min
Jul 10, 4:15 PM CDT	Severe Thunderstorm Warning	AMA	Carson	22 min
Jul 10, 4:58 PM CDT	Special Weather Statement	AMA	Potter	32 min
Jul 10, 5:18 PM CDT	Severe Thunderstorm Warning	AMA	Oldham, Potter	57 min
Jul 10, 5:38 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Moore, Potter	52 min
Jul 10, 5:54 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	66 min
Jul 10, 6:28 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	51 min

Nearby

Severe Thunderstorm Warnings in Texas, 2019 Every severe thunderstorm warning in 2019

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.