Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 184, NWS Amarillo, TX

June 30, 2017Donley County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jun 30, 2017, 10:12 PM CDT for Donley County, Texas. It was in force for 32 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: Jun 30, 2017, 10:12 PM CDT (03:12 UTC)
Expired: Jun 30, 2017, 10:44 PM CDT
In force: 32 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Donley County, TX

The radar

The Amarillo radar (KAMA), 87 km from the middle of the area, began a volume at 03:13 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 00:00Z, 3.2 hours before the alert went out and 86 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: 1235 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1830 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -40 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Jun 30, 5:52 PM CDT, 4 hours 20 minutes earlier.

Area forecast discussion, Jun 30, 5:52 PM CDT, 4 hours 20 minutes before

Area Forecast Discussion
National Weather Service Amarillo TX
552 PM CDT Fri Jun 30 2017

.AVIATION...
00Z TAF Cycle

VFR conditions are expected at all three TAF sites through 05Z to
08Z Saturday except in and near showers and thunderstorms where
MVFR visibilities and ceilings are possible along with strong and
erratic winds from thunderstorms. After 05Z to 08Z Saturday, MVFR
to possibly IFR conditions are expected as low cloudiness
increases at the Dalhart and Amarillo TAF sites. The Guymon TAF
site should see VFR conditions through 00Z Sunday. The Dalhart and
Amarillo TAF sites should see VFR conditions return after 19Z to
21Z Saturday. Northeast to east winds 10 to 20 knots with some
gusts near 25 knots will diminish to around 5 to 15 knots at all
three TAF sites after 08Z to 10Z Saturday and will become east to
southeast after 19Z to 21Z Saturday.

Schneider

&&

.PREV DISCUSSION... /Issued 426 PM CDT Fri Jun 30 2017/

DISCUSSION...
Not many changes have been made to the forecast, other than to
attempt to refine timing of thunderstorm chances through Sunday.

For tonight, moist easterly upslope flow in a moderately unstable
atmosphere will promote the potential for thunderstorm
development, mainly across western and southern sections this
evening, closer to the frontal boundary where instability will be
higher.

Saturday should be mostly dry, with a slight chance of showers and
thunderstorms across southern sections.  Thunderstorm chances
increase Saturday evening and Saturday night, as a shortwave trof
assists in thunderstorm development in northeast New Mexico, with
a good opportunity for thunderstorms to spread east and southeast
across the Texas and Oklahoma Panhandles.  Severe thunderstorms
with hail around one inch in diameter and gusts to around 60 MPH
could occur.  Brief heavy rains will also be possible.

Thunderstorms will be possible Sunday afternoon and Sunday evening
across all sections, with eastern sections being favored, owing to
expected orientation of instability.

Mainly nocturnal thunderstorms expected Monday night through
Wednesday night, primarily across eastern sections, which should
be the most removed from strengthening mid-level ridge.

Cockrell

&&

.AMA Watches/Warnings/Advisories...
TX...None.
OK...None.

&&

11

Hazardous weather outlook, Jun 30, 9:28 PM CDT, 44 minutes before

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In the hours before

Special weather statement, Jun 30, 8:31 PM CDT, 1 hour 41 minutes before

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Special weather statement, Jun 30, 8:45 PM CDT, 1 hour 27 minutes before

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Special weather statement, Jun 30, 9:27 PM CDT, 45 minutes before

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Local storm report, Jun 30, 9:52 PM CDT, 20 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
Jun 30, 7:25 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	65 min
Jun 30, 8:28 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	15 min
Jun 30, 8:31 PM CDT	Special Weather Statement	AMA	Hartley	59 min
Jun 30, 8:45 PM CDT	Special Weather Statement	AMA	Hartley	60 min
Jun 30, 9:27 PM CDT	Special Weather Statement	AMA	Donley	63 min
Jun 30, 10:22 PM CDT	Special Weather Statement	AMA	Armstrong	68 min
Jun 30, 10:27 PM CDT	Areal Flood Advisory	AMA	Donley	3 hr
Jun 30, 10:45 PM CDT	Special Weather Statement	AMA	Donley	60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Every severe thunderstorm warning in 2017

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.