Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 172, NWS Amarillo, TX

September 2, 2001Carson County, Potter County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Sep 2, 2001, 6:31 PM CDT for Carson County, Potter County, Texas. It was in force for 44 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued
Sep 2, 2001, 6:31 PM CDT (23:31 UTC)
Expired
Sep 2, 2001, 7:15 PM CDT
In force
44 min
Issued by
NWS Amarillo, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Carson County, TX, Potter County, TX

What was reported inside it

TimeReportWhereRemark
Sep 2, 7:00 PM CDTHail 1.75Panhandle, TX
Sep 2, 7:01 PM CDTHail 1.75Pantex, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.5 hours before the alert went out and 16 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 12:00Z on 2001-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 215 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 12:00Z on 2001-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.19395878Sfc1 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
215 J/kg
Mixed-layer CIN
-184 J/kg
Mixed-layer LCL
1568 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

803 
WUUS54 KAMA 022332
SVRAMA
TXC065-375-030015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
631 PM CDT SUN SEP 2 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN POTTER COUNTY IN TEXAS
  WESTERN CARSON COUNTY IN TEXAS

* UNTIL 715 PM CDT

* AT 631 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM ABOUT 10 MILES NORTH OF AMARILLO...MOVING    
  EAST AT 10 MPH.

THIS STORM IS CAPABLE OF PRODUCING HAIL GREATER THAN QUARTER SIZE.  
GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 3520 10196 3522 10143 3562 10144 3561 10191

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 Sep 2, 2:41 PM CDT, 3 hours 50 minutes earlier.

Area forecast discussion, Sep 2, 2:41 PM CDT, 3 hours 50 minutes before
TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
241 PM CDT SUN SEP 2 2001

A RATHER FAST BAND OF WESTERLIES CONTINUES ACROSS THE U.S./CANADIAN
BORDER WHILE THE REMAINDER OF THE COUNTRY REMAINS IN A WEAK
WESTERLY FLOW. THE EXCEPTION BEING ACROSS THE DESERT SOUTHWEST AND
INTO THE PANHANDLES WHERE 12Z RAOBS SHOWING WESTERLY 50KT WINDS AT
250MB. LATEST SURFACE ANALYSIS SHOWS A TROUGH ALONG THE CO/KS STATE
LINE STRETCHING SOUTHWEST INTO THE EASTERN NM PLAINS. DRIER AIR
WAS FILTERING INTO THE FAR NORTHWEST CWA WITH OK MESONET SHOWING 19Z
DEW POINTS OF 41F AT BOISE CITY AND KENTON. WE WILL HAVE TO KEEP
AN EYE ON ANY STORMS THAT DEVELOP IN THE NORTHWEST WITH LARGE
SURFACE DEW POINT DEPRESSIONS. MODEL INITIALIZATIONS DID A REASONABLE
JOB WITH A COUPLE OF EXCEPTIONS. 500MB TEMPS LOOK A LITTLE WARM ON
ALL MODELS AND THE AVN WAS TOO AGGRESSIVE WITH THE BOUNDARY LAYER
MOISTURE ACROSS THE CWA.

COLD AIR ADVECTION AT 500MB ALONG WITH LOW-LEVEL HEATING WILL
INCREASE LAPSE RATES ACROSS THE CWA TODAY. WE EXPECT ISOLATED
TO SCATTERED SHOWER AND THUNDERSTORM ACTIVITY ACROSS THE AREA
TONIGHT. CURRENT FORECAST HAS A GOOD HANDLE ON THE SITUATION AND
ONLY ADJUSTMENTS TO FIRST PERIOD WILL BE BASED ON RADAR TRENDS.
UPPER FLOW VEERS FROM NW TO N ON MONDAY WHILE LOW LEVEL FLOW BACKS
TO A MORE SELY DIRECTION. EXCEPTION BEING THE WESTERN CWA WHERE
MODELS SHOWING SOME DRIER AIR IN PLACE. MAY HAVE TO TRIM THE ALREADY
SLIM POPS THERE. DO NOT SEE ANY SURFACE BOUNDARIES TO SERVE AS A
FOCUSING MECHANISM FOR MONDAY NIGHT AND WITH 500MB TEMPS WARMING
PRECIP CHANCES WILL BE ON THE DECLINE. GUT FEELING IS TO PULL POPS
FOR TUESDAY AS HIGHER THETA-E AIR SHIFTS WEST...BUT WITH BOUNDARY
LAYER MOISTURE AND DAYTIME HEATING...CAN/T COMPLETELY RULE OUT
PRECIPITATION.

IN THE EXTENDED (WED-SUN)...MODELS CONTINUE TO OFFER DIFFERENT
SOLUTIONS ON HANDLING THE WEST COAST SYSTEM. NEEDLESS TO SAY
CONFIDENCE IS LOW IN THE EXTENDED PERIOD. WE WILL PULL POPS ON
WEDNESDAY AS MODELS INDICATING DRY NORTHERLY FLOW AND WARMING TEMPS
AT THE MID-LEVELS. RIDGE THEN BUILDS OVER AZ FOR SOME WEAK NW FLOW
ALOFT. PREVIOUS MRF BROUGHT A COLD FRONT INTO THE CWA EARLY FRIDAY.
LATEST RUN ALONG WITH THE AVNX HAS SLOWED THE PROGRESS OF THIS
FRONT. CONFIDENCE NOT HIGH EITHER WAY...BUT WITH THE NOGAPS AND
CANADIAN TRENDING THIS WAY WILL ADJUST FORECAST FOR A SLOWER
FRONTAL PASSAGE.

PRELIM CCF...

AMA 62/88 62/85 61 323
DHT 57/86 59/84 58 313

.AMA...
TX...NONE.
OK...NONE.

PLATT

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.