Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 284, NWS Amarillo, TX

October 11, 2007Roberts County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Oct 11, 2007, 7:31 AM CDT for Roberts County, Texas. It was in force for 59 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: Oct 11, 2007, 7:31 AM CDT (12:31 UTC)
Expired: Oct 11, 2007, 8:30 AM CDT
In force: 59 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

County Roberts County, TX

The radar

The Amarillo radar (KAMA), 105 km from the middle of the area, began a volume at 12:32 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 12:00Z, 0.5 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: 1347 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.8

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 Oct 11, 7:17 AM CDT, 14 minutes earlier.

Area forecast discussion, Oct 11, 7:17 AM CDT, 14 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
717 AM CDT THU OCT 11 2007

.AVIATION...
AN UPPER LEVEL SHORT WAVE WILL COMBINE WITH LOW LEVEL MOISTURE TO
ALLOW FOR SHOWERS AND THUNDERSTORMS TO CONTINUE THIS MORNING ACROSS
THE EASTERN PANHANDLES. THINKING THE STORMS WILL REMAIN EAST OF THE
TAF SITES...WITH KAMA BE THE ONLY SITE THAT MAY SEE PRECIP.
HOWEVER...CONFIDENCE IS LOW SO DID NOT MENTION PRECIP FOR THIS
MORNING. SOUTHERLY SFC WINDS WILL BEGIN TO INCREASE AFTER 16Z AND
HELP CONTINUE MOISTURE ADVECTION INTO THE PANHANDLES. WITH ANOTHER
WEAL UPPER LEVEL WAVE MOVING INTO THE PANHANDLES THIS AFTERNOON...MAY
SEE ISOLATED STORMS DEVELOP AGAIN. CONTINUED CB REMARKS IN TAFS BUT
HELD OFF ON MENTIONING PRECIP FOR NOW.

JJB

&&

.PREV DISCUSSION... /ISSUED 540 AM CDT THU OCT 11 2007/

DISCUSSION...
ISOLD SHOWERS AND TSTMS HAVE REDEVELOPED OVER PARTS OF ERN ZNS SO
HAVE GONE WITH ISOLD COVERAGE TODAY AND TNGT ALL ZONES. ON FRIDAY...
RETAINED 20 POPS ERN ZNS WHERE SLIGHTLY DEEPER MOISTURE WILL BE AND
SFC TROF AXIS MAY NUDGE SLOWLY EWD TO ACT AS A LOW LVL FOCUSING
FEATURE.

NEXT CLOSED UPPER LEVEL LOW PRESSURE SYSTEM STILL PROGGED TO TAKE
AIM AT SRN HIGH PLAINS THIS WEEKEND. MEDIUM RANGE MODELS ARE IN
GENERAL AGREEMENT ON THIS SYSTEM NEARING THE FOUR CORNERS LATE
SATURDAY AFTERNOON...THEN HEADING ENE ACROSS NRN NM AND CO INTO THE
SRN AND CNTRL PLAINS BY LATE SUNDAY. DECIDED TO KEEP SLGT CHC POPS
ALL SECTIONS SAT NIGHT AND MAINLY NRN AND ERN SECTIONS SUNDAY AS
SWRN TX PNHDL WILL LIKELY BE DRY SLOTTED BASED ON PROGGED TRACK OF
THE UPPER LOW. CORRESPONDING SFC COLD FRONT TO MOVE EWD ACROSS FCST
AREA ON SUNDAY AND EARLY SUNDAY EVENING.

AFTER THIS NEXT UPPER LOW EXITS LATE SUNDAY...GENERALLY DRY WX
ANTICIPATED FOR EARLY NEXT WEEK.

FIRE WEATHER...
THE COMBINATION OF BREEZY TO WINDY CONDITIONS ON SATURDAY COUPLED
WITH EXPECTED MINIMUM RH VALUES OF BETWEEN 20 AND 30 PERCENT AND
UNSEASONABLY WARM TEMPERATURES WILL LIKELY LEAD TO ELEVATED FIRE WX
CONCERNS. DO NOT ANTICIPATE RED FLAG CRITERIA BEING MET DUE TO RH
VALUES LIKELY REMAINING ABOVE 15 PERCENT. A FIRE DANGER STATEMENT
WILL NEED TO BE STRONGLY CONSIDERED ON SATURDAY.

ANDRADE

&&

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

&&

14/02

Hazardous weather outlook, Oct 11, 6:00 AM CDT, 1 hour 31 minutes before

TEXAS/OKLAHOMA PANHANDLES HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AMARILLO TX
600 AM CDT THU OCT 11 2007

OKZ001>003-TXZ001>020-111800-
ARMSTRONG-BEAVER-CARSON-CIMARRON-COLLINGSWORTH-DALLAM-DEAF SMITH-
DONLEY-GRAY-HANSFORD-HARTLEY-HEMPHILL-HUTCHINSON-LIPSCOMB-MOORE-
OCHILTREE-OLDHAM-POTTER-RANDALL-ROBERTS-SHERMAN-TEXAS-WHEELER-
600 AM CDT THU OCT 11 2007

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

.DAY ONE...

THUNDERSTORMS WILL BE POSSIBLE THIS MORNING ACROSS THE EASTERN TEXAS
PANHANDLE...WITH ISOLATED STORMS POSSIBLE AGAIN THIS AFTERNOON AND
EVENING ACROSS THE ENTIRE PANHANDLES. A FEW STORMS MAY APPROACH
SEVERE LEVELS WITH LARGE HAIL AND DAMAGING WINDS AS THE PRIMARY
THREATS.

.DAYS TWO THROUGH SEVEN...

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE EASTERN
OKLAHOMA AND TEXAS PANHANDLES FRIDAY AFTERNOON AND FRIDAY NIGHT
AND ACROSS MUCH OF THE PANHANDLES SATURDAY NIGHT AND SUNDAY. A FEW
STORMS MAY APPROACH SEVERE LEVELS WITH LARGE HAIL AND DAMAGING WINDS
AS THE PRIMARY THREATS. BREEZY CONDITIONS ON SATURDAY COULD ALSO
RESULT IN ELEVATED FIRE DANGER CONDITIONS...ESPECIALLY ACROSS THE
WESTERN HALF OF THE PANHANDLES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

BROST

In the hours before

Local storm report, Oct 11, 6:36 AM CDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE AMARILLO TX
636 AM CDT THU OCT 11 2007

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0610 PM     TSTM WND GST     1 E BUSHLAND            35.19N 102.05W
10/10/2007  E65 MPH          POTTER             TX   TRAINED SPOTTER

            WINDS ESTIMATED AT 60 TO 70 MPH.

0615 PM     HAIL             8 W AMARILLO            35.20N 101.96W
10/10/2007  E1.00 INCH       POTTER             TX   TRAINED SPOTTER

            HAIL NEAR HOPE ROAD AND INTERSTATE 40. HAIL LASTED FOR
            ABOUT 5 MINUTES.

0628 PM     HAIL             6 WNW AMARILLO          35.24N 101.92W
10/10/2007  M1.00 INCH       POTTER             TX   NWS EMPLOYEE

            QUARTER SIZE HAIL ACCUMULATED ON GROUND NEAR THE
            WALMART AT TASCOSA ROAD

0635 PM     HAIL             AMARILLO                35.20N 101.82W
10/10/2007  E1.00 INCH       POTTER             TX   BROADCAST MEDIA

            DIME TO QUARTER SIZE HAIL IN SAN JACINTO AREA RELAYED
            BY LOCAL MEDIA

0635 PM     HAIL             2 W AMARILLO            35.20N 101.85W
10/10/2007  E0.75 INCH       POTTER             TX   NWS EMPLOYEE

            NEAR AMARILLO BLVD AND MCMASTERS

0635 PM     HAIL             4 N AMARILLO            35.26N 101.82W
10/10/2007  M1.75 INCH       POTTER             TX   PUBLIC

            GOLF BALL SIZE HAIL IN PLEASANT VALLEY

0636 PM     HAIL             3 NW AMARILLO           35.23N 101.86W
10/10/2007  E0.88 INCH       POTTER             TX   EMERGENCY MNGR

            NICKLE SIZE HAIL AT AMARILLO BOULEVARD AND WESTERN

0646 PM     HAIL             4 NNE AMARILLO          35.26N 101.79W
10/10/2007  E1.00 INCH       POTTER             TX   PUBLIC

            NORTH 24TH AND GRAND

0648 PM     HAIL             4 N AMARILLO            35.26N 101.82W
10/10/2007  E1.75 INCH       POTTER             TX   BROADCAST MEDIA

            QUARTER TO GOLF BALL SIZE HAIL ON NORTH COLORADO ST
            NEAR LOOP 335

0648 PM     HAIL             2 NE AMARILLO           35.22N 101.79W
10/10/2007  E1.75 INCH       POTTER             TX   BROADCAST MEDIA

            GOLF BALL SIZE HAIL NEAR MESA VERDE ELEMENTARY

0650 PM     HAIL             5 N AMARILLO            35.28N 101.82W
10/10/2007  E1.75 INCH       POTTER             TX   BROADCAST MEDIA

            GOLF BALL SIZE HAIL

0702 PM     HAIL             6 NNW AMARILLO          35.28N 101.86W
10/10/2007  E0.75 INCH       POTTER             TX   TRAINED SPOTTER

            DIME TO ALMOST QUARTER SIZE HAIL IN CHAPARRAL HILLS

0705 PM     HAIL             7 N AMARILLO            35.30N 101.82W
10/10/2007  E1.00 INCH       POTTER             TX   BROADCAST MEDIA

            QUARTER SIZE HAIL AT BROADWAY AND CHERRY

0726 PM     HAIL             7 NE AMARILLO           35.27N 101.73W
10/10/2007  E0.75 INCH       POTTER             TX   NWS EMPLOYEE

            DIME TO PENNY SIZE HAIL REPORTED AT LOOP 335 AND FRITCH
            HWY

0728 PM     HAIL             5 E AMARILLO            35.20N 101.73W
10/10/2007  E0.75 INCH       POTTER             TX   NWS EMPLOYEE

            LAKESIDE AND LOOP 335

0730 PM     HAIL             5 E AMARILLO            35.20N 101.73W
10/10/2007  E1.00 INCH       POTTER             TX   NWS EMPLOYEE

            NICKEL TO QUARTER SIZE HAIL AT LAKESIDE AND LOOP 335

0735 PM     HAIL             5 E AMARILLO            35.20N 101.73W
10/10/2007  E1.25 INCH       POTTER             TX   NWS EMPLOYEE

            ONE AND ONE QUARTER INCH HAIL AT LAKESIDE AND
            INTERSTATE 40

0747 PM     HAIL             6 E AMARILLO            35.20N 101.71W
10/10/2007  M0.75 INCH       POTTER             TX   OTHER FEDERAL

            RECORDED AT THE TOWER AT RICK HUSBAND INTL AIRPORT

0915 PM     FLASH FLOOD      6 SW AMARILLO           35.14N 101.89W
10/10/2007                   RANDALL            TX   PUBLIC

            WAIST DEEP WATER REPORTED AT A RESTARAUNT ON COULTER
            STREET SOUTH OF 45TH

&&

EVENT NUMBER 00003 00004 00005 00007 00008 00010 00006 00012 00009
00011 00013 00014 00015 00016 00017 00018 00019 00020 00022

ERA

Special weather statement, Oct 11, 7:21 AM CDT, 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
721 AM CDT THU OCT 11 2007

TXZ009-111300-
ROBERTS TX-
721 AM CDT THU OCT 11 2007

...STRONG THUNDERSTORM IN CENTRAL ROBERTS COUNTY...

AT 721 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER WEST CENTRAL ROBERTS COUNTY MOVING NORTHEAST
AT 15 MPH.

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

JJB

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 10, 7:00 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	60 min
Oct 10, 7:45 PM CDT	Severe Thunderstorm Warning	AMA	Sherman	60 min
Oct 10, 8:56 PM CDT	Flash Flood Warning	AMA	Potter, Randall	3 hr
Oct 11, 10:28 AM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley	92 min
Oct 11, 4:38 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith	30 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007 Every 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.