Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 176, NWS Amarillo, TX

July 17, 2009Dallam County, Hartley County, Texas; Cimarron County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 17, 2009, 9:15 PM CDT for Dallam County, Hartley County, Texas; Cimarron County, Oklahoma. It was in force for 60 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 17, 2009, 9:15 PM CDT (02:15 UTC)
Expired: Jul 17, 2009, 10:15 PM CDT
In force: 60 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Cimarron County, OK, Dallam County, TX, Hartley County, TX

The radar

The Amarillo radar (KAMA), 141 km from the middle of the area, began a volume at 02:14 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
Jul 17, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.3 hours before the alert went out and 142 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: 857 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1951 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 Jul 17, 6:21 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, Jul 17, 6:21 PM CDT, 2 hours 54 minutes before

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Hazardous weather outlook, Jul 17, 3:00 PM CDT, 6 hours 15 minutes before

TEXAS/OKLAHOMA PANHANDLES HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
300 PM CDT FRI JUL 17 2009

OKZ001>003-TXZ001>020-181100-
ARMSTRONG-BEAVER-CARSON-CIMARRON-COLLINGSWORTH-DALLAM-DEAF SMITH-
DONLEY-GRAY-HANSFORD-HARTLEY-HEMPHILL-HUTCHINSON-LIPSCOMB-MOORE-
OCHILTREE-OLDHAM-POTTER-RANDALL-ROBERTS-SHERMAN-TEXAS-WHEELER-
300 PM CDT FRI JUL 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE TEXAS AND OKLAHOMA
PANHANDLES.

.DAY ONE...

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR ALL OF THE OKLAHOMA
AND TEXAS PANHANDLES UNTIL 10 PM...

SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON
THROUGH TONIGHT ACROSS ALL OF THE OKLAHOMA AND TEXAS PANHANDLES AS A
MINOR UPPER LEVEL LOW PRESSURE SYSTEM MOVES ACROSS THE REGION FROM
THE NORTHWEST. SOME OF THE STORMS THAT FORM WILL LIKELY BECOME
SEVERE...WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY THREATS.

.DAYS TWO THROUGH SEVEN...

THERE IS A SLIGHT CHANCE TO CHANCE OF THUNDERSTORMS ACROSS ALL OF
THE OKLAHOMA AND TEXAS PANHANDLES ON SATURDAY...THEN AGAIN ON SUNDAY
NIGHT...MONDAY NIGHT...TUESDAY NIGHT...AND WEDNESDAY NIGHT. SOME OF
THE STORMS WHICH DEVELOP DURING THIS TIME MAY BECOME STRONG TO SEVERE
...WITH DAMAGING WINDS AND LARGE HAIL THE PRIMARY THREATS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER GROUPS AND EMERGENCY MANAGEMENT OFFICIALS ACROSS ALL OF THE
OKLAHOMA AND TEXAS PANHANDLES SHOULD REMAIN ALERT AND BE READY FOR
POSSIBLE ACTIVATION LATER THIS AFTERNOON AND TONIGHT.

ANDRADE

In the hours before

Local storm report, Jul 17, 7:09 PM CDT, 2 hours 6 minutes before

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Local storm report, Jul 17, 7:13 PM CDT, 2 hours 2 minutes before

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Local storm report, Jul 17, 7:22 PM CDT, 1 hour 53 minutes before

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Local storm report, Jul 17, 7:37 PM CDT, 1 hour 38 minutes before

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Local storm report, Jul 17, 7:48 PM CDT, 1 hour 27 minutes before

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Special weather statement, Jul 17, 8:46 PM CDT, 29 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
Jul 17, 7:02 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Wheeler	58 min
Jul 18, 3:51 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	54 min
Jul 18, 4:38 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	67 min
Jul 18, 4:39 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	66 min
Jul 18, 4:58 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	62 min
Jul 18, 5:29 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	61 min
Jul 18, 5:41 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	64 min
Jul 18, 5:58 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	62 min
Jul 18, 6:15 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham, Potter, Randall	60 min
Jul 18, 6:45 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	60 min
Jul 18, 6:53 PM CDT	Severe Thunderstorm Warning	AMA	Donley, Gray	67 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.