Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 169, NWS Amarillo, TX

May 29, 2007Sherman County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at May 29, 2007, 8:58 PM CDT for Sherman 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
May 29, 2007, 8:58 PM CDT (01:58 UTC)
Expired
May 29, 2007, 9:30 PM CDT
In force
32 min
Issued by
NWS Amarillo, TX
Area
Counties, with a storm outline in the text

County Sherman County, TX

The radar

The Amarillo radar (KAMA), 117 km from the middle of the area, began a volume at 02:00 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, 2.0 hours before the alert went out and 118 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-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2007-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1235 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2007-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
-85 J/kg
Mixed-layer LCL
2271 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.4

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 May 29, 6:35 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, May 29, 6:35 PM CDT, 2 hours 23 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
635 PM CDT TUE MAY 29 2007

.AVIATION...
DRYLINE CURRENTLY SET UP JUST WEST OF A KAMA TO KCAO LINE...BUT IT IS
MOVING SLOWLY EAST. SO EXPECT STORM DEVELOPMENT MAINLY IN THE CENTRAL
TO NORTHERN PANHANDLES WITH KGUY AND MAYBE KDHT AS MOST LIKELY TAF
SITES TO SEE PRECIP. PRECIP CHANCES WILL MOVE EAST THROUGH THE
EVENING THOUGH. WINDS WILL STAY IN THE 20KT RANGE GENERALLY OUT OF
THE SOUTH AS THE LL JET IS IN PLACE. COLD FRONT ANTICIPATED TO REACH
THE OKLAHOMA PANHANDLE AROUND 08Z THEN PASS THROUGH KAMA AROUND 10Z.
COULD SEE SOME ISOLATED STORMS FORM ALONG THE FRONT...WITH LOW CIGS
ALSO OCCURRING IN THE IFR RANGE. MAY SEE SOME PATCH BR FOR A BRIEF
PERIOD OF TIME BEHIND THE FRONT...BUT ANY BR WOULD LIFT BY 13Z OR SO.

JJB

&&

.PREV DISCUSSION... /ISSUED 345 PM CDT TUE MAY 29 2007/

DISCUSSION...
DRYLINE HAS BECOME ESTABLISHED JUST EAST OF AMARILLO...ABOUT HALFWAY
BETWEEN AMARILLO AND THE EDGE OF THE CAPROCK. WINDS ALOFT ARE
RELATIVELY WEAK SO WE WILL HAVE TO SEE WHAT THUNDERSTORMS WILL DO
ONCE THEY DEVELOP. BEST CHANCES FOR SEVERE WEATHER WILL BE ACROSS
THE EASTERN HALF OF THE PANHANDLE WHERE SURFACE WINDS WILL BE OUT
OF THE SOUTH SOUTHEAST AND DEEPEST MOISTURE WILL BE LOCATED. SEVERE
WEATHER CHANCES WILL TAPER OFF AFTER MIDNIGHT BUT PRECIPITATION
CHANCES WILL CONTINUE ACROSS THE EAST THROUGH TOMORROW AFTERNOON AS
THE COLD FRONT PUSHES ACROSS THE AREA. SLOW STORM MOTION COULD RESULT
IN ISOLATED AREAS RECEIVING HEAVY RAINFALL WITH THE POSSIBILITY OF
FLASH FLOODING.

FRONT PUSHES FAR ENOUGH SOUTH THAT RAIN CHANCES WILL REMAIN LOW
WEDNESDAY THROUGH THURSDAY...BUT NOT NEGLIGIBLE. A FEW SHORTWAVES
COULD MOVE ACROSS THE AREA WED/THUR THANKS TO THE UPPER LEVEL LOW
WHICH THE MAJORITY OF THE MODELS LEAVE SPINNING OVER THE NORTHERN
PLAINS.  AS WARM FRONT MOVES NORTH ON THURSDAY AFTERNOON THROUGH
EVENING...RAIN CHANCES WILL ONCE AGAIN INCREASE FOR THURSDAY NIGHT.

THROUGH SUNDAY...NORTHWESTERLY FLOW DEVELOPS SO PRECIPITATION CHANCES
SHOULD REMAIN IN PLACE AFTERNOONS AND EVENINGS THROUGH AT LEAST
SUNDAY. CLEANED UP POP GRIDS FROM FRIDAY ON TO CARRY MAJORITY OF
SLIGHT CHANCE POPS THROUGH SUNDAY. CONTINUED WITH TEMPERATURES
SLIGHTLY COOLER THAN MEX GUIDANCE FOR HIGHS AND WARMER FOR LOWS AS
MOISTURE REMAINS ACROSS THE REGION.

JORDAN

&&

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

&&

14/11
Hazardous weather outlook, May 29, 1:00 PM CDT, 7 hours 58 minutes before
TEXAS/OKLAHOMA PANHANDLES HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AMARILLO TX
100 PM CDT TUE MAY 29 2007

OKZ001>003-TXZ001>020-301100-
ARMSTRONG-BEAVER-CARSON-CIMARRON-COLLINGSWORTH-DALLAM-DEAF SMITH-
DONLEY-GRAY-HANSFORD-HARTLEY-HEMPHILL-HUTCHINSON-LIPSCOMB-MOORE-
OCHILTREE-OLDHAM-POTTER-RANDALL-ROBERTS-SHERMAN-TEXAS-WHEELER-
100 PM CDT TUE MAY 29 2007

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

.DAY ONE...

THERE IS SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS THE PANHANDLES
THIS AFTERNOON...THIS EVENING...AND TONIGHT.  THE MAIN THREATS WILL
BE LARGE HAIL AND DAMAGING WINDS...BUT AN ISOLATED TORNADO CANNOT BUT
RULED OUT DURING THE LATE AFTERNOON AND EARLY EVENING HOURS.
ADDITIONALLY...SLOW STORM MOVEMENT AND LOCALLY HEAVY RAINFALL WILL
CONTINUE TO PROVIDE A THREAT FOR LOCALIZED FLOODING. ALSO...CAUTION
IS ADVISED ON AREA LAKES THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH OF THE PANHANDLES
THROUGH SUNDAY. SOME STORMS MAY BECOME SEVERE WEDNESDAY AND
THURSDAY DURING THE AFTERNOON AND EVENING...WITH THE MAIN THREATS
BEING LARGE HAIL AND DAMAGING WINDS. ALSO...THE THREAT OF LOCALLY
HEAVY RAINFALL WILL CONTINUE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER GROUPS AND EMERGENCY MANAGEMENT OFFICIALS ACROSS ALL
SECTIONS OF THE TEXAS AND OKLAHOMA PANHANDLES SHOULD REMAIN ALERT AND
BE READY FOR ACTIVATION THIS AFTERNOON OR THIS EVENING.

COCKRELL

In the hours before

Special weather statement, May 29, 6:37 PM CDT, 2 hours 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
637 PM CDT TUE MAY 29 2007

OKZ001-300015-
CIMARRON OK-
637 PM CDT TUE MAY 29 2007

...STRONG THUNDERSTORM IN SOUTHWESTERN CIMARRON COUNTY...

AT 637 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES SOUTHWEST OF WHEELESS MOVING EAST AT 20
MPH.

HAIL...STRONG WINDS...AND VERY HEAVY RAINFALL ARE POSSIBLE WITH THIS
STORM.

STORM INTENSITY IS PULSING AND SEVERE WEATHER MAY DEVELOP RAPIDLY.
IN ADDITION...THE SLOW MOVING NATURE OF THE STORM WILL BRING BRIEF
HEAVY DOWNPOURS THAT COULD CAUSE RAPID PONDING OF WATER ON
ROADWAYS...OR INCREASED WATER LEVELS IN LOW LYING AREAS.

JJB
Special weather statement, May 29, 7:36 PM CDT, 1 hour 22 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
736 PM CDT TUE MAY 29 2007

OKZ001-TXZ001-300115-
CIMARRON OK-DALLAM TX-
736 PM CDT TUE MAY 29 2007

...STRONG THUNDERSTORM IN SOUTH CENTRAL CIMARRON AND NORTHEASTERN
DALLAM COUNTIES...

AT 736 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES SOUTH OF BOISE CITY MOVING EAST AT 35
MPH.

HAIL...STRONG WINDS UP TO 45 MPH CAUSING AREAS OF BLOWING DUST...AND
VERY HEAVY RAINFALL ARE POSSIBLE WITH THIS STORM.

STORM INTENSITY IS PULSING AND SEVERE WEATHER MAY DEVELOP RAPIDLY.
IN ADDITION...BRIEF HEAVY RAIN COULD PRODUCE PONDING OF WATER ON
ROADWAYS...AND RISING WATER IN LOW LYING AREAS.

JJB
Special weather statement, May 29, 8:14 PM CDT, 44 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 12:05 AM CDTFlash Flood WarningAMAOchiltree6 hr
May 29, 11:30 PM CDTSevere Thunderstorm WarningAMATexas60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007Every severe thunderstorm warning in 2007

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.