Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 224, NWS Amarillo, TX

July 31, 2009Deaf Smith County, Oldham County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 31, 2009, 9:50 PM CDT for Deaf Smith County, Oldham County, Texas. It was in force for 55 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 31, 2009, 9:50 PM CDT (02:50 UTC)
Expired: Jul 31, 2009, 10:45 PM CDT
In force: 55 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Deaf Smith County, TX, Oldham County, TX

The radar

The Amarillo radar (KAMA), 81 km from the middle of the area, began a volume at 02:50 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 31, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

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 31, 8:08 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jul 31, 8:08 PM CDT, 1 hour 42 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
808 PM CDT FRI JUL 31 2009

.AVIATION...
A BAND OF CONVECTION WILL MOVE ACROSS THE THREE TAF SITES THIS
EVENING AND LATE TONIGHT. A COLD FRONT WILL PUSH SOUTH ACROSS THE TAF
SITES LATE TONIGHT AND SATURDAY MORNING SHIFTING TO THE WINDS TO THE
NORTH AND THEN VEERING AROUND TO THE EAST BY LATE SATURDAY. VFR
CONDITIONS WILL PREVAIL EXCEPT IN AND NEAR THUNDERSTORMS WHERE MVFR
CONDITIONS AND STRONG ERRATIC WINDS WILL OCCUR.

SCHNEIDER

&&

.PREV DISCUSSION... /ISSUED 324 PM CDT FRI JUL 31 2009/

DISCUSSION...
MAIN FORECAST CONCERNS THIS AFTERNOON CENTER AROUND CONVECTIVE
CHANCES IN THE SHORT TERM PERIODS.

ISOLATED SHOWERS AND THUNDERSTORMS HAVE ALL READY DEVELOPED THIS
AFTERNOON ACROSS THE SOUTHERN AND EASTERN TEXAS PANHANDLE. EXPECT
CONVECTIVE COVERAGE TO INCREASE OVER THE NEXT FEW HOURS AS ATMOSPHERE
CONTINUES TO DESTABILIZE. FURTHER TO THE NORTHWEST...SHOWERS AND
THUNDERSTORMS HAVE DEVELOPED ON THE HIGHER TERRAIN ACROSS COLORADO IN
RESPONSE TO THE NEXT UPPER LEVEL DISTURBANCE WHICH WILL BE MOVING
TOWARDS THE PANHANDLES THIS EVENING. CHANCE POPS WERE RETAINED
AREAWIDE FROM 00Z TO 06Z...TAPERING OFF TO SLIGHT END POPS ACROSS
WESTERN ZONES WITH CHANCE TO LIKELY POPS ACROSS THE REMAINDER OF THE
AREA FROM 06Z TO 12Z. ALSO...COLD FRONT SHOULD BE MOVING THROUGH THE
AREA AS WELL TONIGHT WHICH SHOULD PROVIDE AN ADDITIONAL FOCUS FOR
SHOWERS AND THUNDERSTORMS. WITH SUFFICIENT INSTABILITY...AND
INCREASING SHEAR COURTESY OF 30 TO 40 KNOTS OF WEST/NORTHWEST FLOW
ALOFT...STRONG TO SEVERE STORMS WILL BE POSSIBLE LATE THIS AFTERNOON
AND EVENING. RETAINED MENTIONED OF SEVERE STORMS IN THE GRIDS...AS
LARGE HAIL AND DAMAGING WINDS APPEAR TO BE THE MAIN THREATS.

BOUNDARY SHOULD BE EXITING THE PANHANDLES BY 12Z OR SO BUT DECIDED
TO LEAVE SOME LINGERING POPS ACROSS THE EASTERN ZONES ON SATURDAY.
TEMPERATURES ON SATURDAY SHOULD REMAIN IN THE 80S ACROSS MUCH OF THE
AREA...WHICH IS IN PRETTY GOOD AGREEMENT WITH LATEST MAV/MET
GUIDANCE. ONLY CAVEAT WOULD BE IN CLOUD COVER PERSISTS IN THE
MORNING THEN WE MAY STRUGGLE TO REACH FORECAST MAX T/S. CONVECTIVE
CHANCES RETURN ON SUNDAY/SUNDAY NIGHT DUE TO ANOTHER UPPER LEVEL
DISTURBANCE EMBEDDED IN NORTHWEST FLOW ALOFT.

BIG QUESTION FOR NEXT WEEK WILL BE HOW FAR EAST THE UPPER LEVEL
RIDGE TRANSLATES. LATEST RUN OF THE 12Z EUROPEAN LOOKS TO BE IN
BETTER AGREEMENT IN WITH THE 12Z GFS IN MOVING THE RIDGE INTO THE
SOUTHERN HIGH PLAINS. LATEST MEX NUMBERS SUPPORT THIS SCENARIO BY
RETURNING TEMPERATURES TO 100 PLUS DEGREES ACROSS PARTS OF THE
PANHANDLES THROUGH THE MIDDLE OF NEXT WEEK. HOWEVER...WITH RECENT
RAINFALL ACROSS THE AREA...HAVE OPTED TO UNDERCUT GUIDANCE BY 3 TO 5
DEGREES MONDAY THROUGH THURSDAY. MAY HAVE TO WATCH OUT FOR A
DISTURBANCE OR TWO MOVING ACROSS THE TOP OF THE RIDGE...BUT AT THIS
POINT MAY STAY NORTH OF THE PANHANDLES. WILL LEAVE MENTIONABLE POPS
OUT OF THE FORECAST AFTER SUNDAY.

TAB

FIRE WEATHER...
FIRE WEATHER CONCERNS SHOULD REMAIN LOW THROUGH THE NEXT WEEK DUE TO
RECENT RAINFALLS AND RELATIVE HUMIDITY VALUES REMAINING ABOVE 20
PERCENT.

TAB

&&

.AMA WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
OK...NONE.

&&

14/11

Hazardous weather outlook, Jul 31, 8:59 PM CDT, 51 minutes before

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In the hours before

Local storm report, Jul 31, 8:57 PM CDT, 53 minutes before

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Local storm report, Jul 31, 8:59 PM CDT, 51 minutes before

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Special weather statement, Jul 31, 9:20 PM CDT, 30 minutes before

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Local storm report, Jul 31, 9:30 PM CDT, 20 minutes before

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Local storm report, Jul 31, 9:40 PM CDT, 10 minutes before

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Local storm report, Jul 31, 9:43 PM CDT, 7 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 31, 8:09 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	66 min
Jul 31, 8:40 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	65 min
Jul 31, 8:55 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hansford, Sherman	65 min
Jul 31, 9:02 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Hutchinson, Moore	58 min
Jul 31, 10:06 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson, Lipscomb, Ochiltree, Roberts	54 min
Jul 31, 11:25 PM CDT	Areal Flood Advisory	AMA	Deaf Smith	3 hr
Jul 31, 8:23 PM CDT	Severe Thunderstorm Warning	AMA	Texas	52 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; radar from the NEXRAD Level II archive.