Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 208, NWS Amarillo, TX

July 28, 20094 counties in Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 28, 2009, 8:45 PM CDT for 4 counties in Texas. 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 28, 2009, 8:45 PM CDT (01:45 UTC)
Expired: Jul 28, 2009, 9:45 PM CDT
In force: 60 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Collingsworth County, TX, Donley County, TX, Gray County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 106 km from the middle of the area, began a volume at 01:48 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 28, 6:09 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.8 hours before the alert went out and 105 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: 489 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 2404 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

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 28, 6:22 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, Jul 28, 6:22 PM CDT, 2 hours 23 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
622 PM CDT TUE JUL 28 2009

.AVIATION...
NORTHWESTERLY FLOW ALOFT ALONG WITH A FRONTAL BOUNDARY IN THE
PANHANDLES WILL KEEP SHOWERS AND THUNDERSTORMS THROUGH WEDNESDAY
MORNING. ADDITIONAL CONVECTION IS EXPECTED TO DEVELOP BY LATE
WEDNESDAY. VFR CONDITIONS WILL PREVAIL EXCEPT IN AND NEAR THE SHOWERS
AND THUNDERSTORMS WHERE MVFR CONDITIONS... AND STRONG ERRATIC WINDS
WILL OCCUR.

SCHNEIDER

&&

.PREV DISCUSSION... /ISSUED 259 PM CDT TUE JUL 28 2009/

DISCUSSION...
COLD FRONT IN THE AREA...INCREASING SHEAR AND DIFFLUENCE ALOFT IN
ASSOCIATION WITH A SHORT WAVE TROUGH AND ABUNDANT MOISTURE WILL BRING
A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS TO MUCH OF THE PANHANDLES
OVERNIGHT. THE BEST CHANCE OF STORMS WILL BE ACROSS THE WESTERN HALF
OF THE PANHANDLES. AN MCS IS EXPECTED TO GET ORGANIZED OVER THE RATON
MESA AND MOVE SOUTHEAST ACROSS THE WESTERN PANHANDLES OVERNIGHT.
THESE SHOWERS AND STORMS WILL BE MOVING OVER AREAS THAT HAVE
RECEIVED HEAVY RAIN IN THE LAST FEW DAYS. THEREFORE...WE HAVE ISSUED
A FLASH FLOOD WATCH ACROSS THE WESTERN PANHANDLES GENERALLY WEST OF A
EVA OKLAHOMA TO WAYSIDE TEXAS LINE. SHOWERS AND STORMS MAY STILL BE
ONGOING ACROSS THE SOUTHWEST TEXAS PANHANDLE AFTER 12Z ON
WEDNESDAY...THEREFORE HAVE EXTENDED THE FLASH FLOOD WATCH THROUGH 18Z
ON WEDNESDAY.

ON WEDNESDAY...AN UPPER LEVEL SHORT WAVE TROUGH MOVES ACROSS THE CWA
DURING THE DAY WHICH COULD KEEP CONVECTION GOING THROUGH THE DAY...
ESPECIALLY IN THE EAST.  ANOTHER STRONGER COLD FRONT MOVES THROUGH
THE PANHANDLES ON WEDNESDAY NIGHT IN ASSOCIATION WITH ANOTHER UPPER
LEVEL DISTURBANCE MOVING THROUGH THE NORTHWEST FLOW ALOFT. SO...
SHOWERS AND THUNDERSTORMS LOOK LIKE ANOTHER GOOD BET.

HIGH TEMPERATURES WILL BE MUCH COOLER ON THURSDAY BEHIND THE FRONT
UNDER A MAINLY CLOUDY SKY.

A NORTHWEST FLOW ALOFT IS EXPECTED TO CONTINUE THROUGH THE END OF THE
WEEKEND. THIS FLOW WILL CONTINUE TO OPEN THE DOOR FOR SHORT WAVE
TROUGHS TO MOVE THROUGH THE PANHANDLES AND FOR MOUNTAIN CONVECTION
TO HEAD THIS WAY...SO WILL KEEP POPS GOING.

FIRE WEATHER...
FIRE WEATHER CONCERNS WILL REMAIN AT A MINIMUM THROUGH THIS FORECAST
AS DEW POINTS REMAIN FAIRLY HIGH AND DRYING POTENTIAL WILL BE LOW
GIVEN THE CHANCES OF RAIN.

&&

.AMA WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH THROUGH WEDNESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: DALLAM...DEAF SMITH...HARTLEY...MOORE...OLDHAM...
     POTTER...RANDALL...SHERMAN.

OK...FLASH FLOOD WATCH THROUGH WEDNESDAY AFTERNOON FOR THE FOLLOWING
     ZONES: CIMARRON.

&&

11/14

Hazardous weather outlook, Jul 28, 8:31 PM CDT, 14 minutes before

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In the hours before

Local storm report, Jul 28, 8:22 PM CDT, 23 minutes before

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Local storm report, Jul 28, 8:23 PM CDT, 22 minutes before

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Local storm report, Jul 28, 8:30 PM CDT, 15 minutes before

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Local storm report, Jul 28, 8:32 PM CDT, 13 minutes before

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Local storm report, Jul 28, 8:34 PM CDT, 11 minutes before

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Special weather statement, Jul 28, 8:40 PM CDT, 5 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 28, 7:03 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
Jul 28, 7:22 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	53 min
Jul 28, 7:34 PM CDT	Flash Flood Warning	AMA	Armstrong, Carson, Potter, Randall	4 hr
Jul 28, 7:47 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray, Potter	58 min
Jul 28, 8:09 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Randall	42 min
Jul 28, 10:37 PM CDT	Areal Flood Advisory	AMA	Lipscomb	3 hr
Jul 28, 11:34 PM CDT	Areal Flood Warning	AMA	Randall	12 hr
Jul 29, 4:38 AM CDT	Flash Flood Watch	AMA	Armstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 14 more	24 hr
Jul 29, 5:19 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	56 min
Jul 29, 6:02 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	47 min
Jul 29, 6:32 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Hartley, Oldham	58 min
Jul 29, 6:41 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron	34 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.