Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 50, NWS Amarillo, TX

April 30, 2000Gray County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 30, 2000, 2:51 AM CDT for Gray County, Texas. It was in force for 54 min. 3 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: Apr 30, 2000, 2:51 AM CDT (07:51 UTC)
Expired: Apr 30, 2000, 3:45 AM CDT
In force: 54 min
Issued by: NWS Amarillo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Gray County, TX

The radar

The Amarillo radar (KAMA), 83 km from the middle of the area, began a volume at 07:55 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.

What was reported inside it

Time	Report	Where
Apr 30, 3:25 AM CDT	Hail 0.88	Pampa, TX
Apr 30, 3:30 AM CDT	Hail 1.75	Pampa, TX
Apr 30, 3:45 AM CDT	Hail 1	Pampa, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 12:30 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 7.9 hours before the alert went out and 83 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: 2063 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1561 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 440 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 20.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 300752
SVRAMA
TXC179-300845-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
251 AM CDT SUN APR 30 2000

THE NATIONAL WEATHER SERVICE IN AMARILLO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN GRAY COUNTY IN THE TEXAS PANHANDLE

* UNTIL 345 AM CDT

* AT 251 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 18 MILES SOUTHWEST OF PAMPA...MOVING NORTH-NORTHEAST
  AT 30 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  KINGSMILL...PAMPA AND LEFORS

LARGE HAIL...DAMAGING WINDS...AND TORRENTIAL RAINS ARE EXPECTED WITH
THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER.

A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS.

LAT...LON 3557 10054 3562 10055 3563 10109 3543 10109
          3528 10109 3523 10103 3523 10092 3551 10061

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 Apr 29, 1:30 PM CDT, 13 hours 21 minutes earlier.

Area forecast discussion, Apr 29, 1:30 PM CDT, 13 hours 21 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
130 PM CDT SAT APR 29 2000

ALREADY SEEING CUMULUS FIELD DVLPG ON VSBL STLT IMAGERY ACRS THE
WRN/SWRN TX PNHDL WHICH IS ALSO VSBL OUT OF THE OFFICE WINDOW.  WITH
SFC DWPNTS IN THE UPR 40S OVR THE NWRN SXNS OF THE FA TO THE 55 TO 60
DEG RANGE ACRS THE ERN SXNS OF THE FA...THE DRYLN LOCATED BTWN KCAO
AND KRTN TO W OF KTCC TO NR KROW.  LOW LVL MSTR CONTS TO ADVECT
INTO THE FA FM THE S AND SE.  THE DRYLN SHOULD MOV VERY SLOLY EWD
TO NR THE TX/NM STATE LN BY LT TDA AND THEN ACRS THE WRN SXNS OF
THE FA BY TNGT BFR MOVG BACK WWD AGAIN TO NR THE TX/NM STATE LN BY
SUN MRNG.  CUT OFF/CLSD UPR LOW NR THE FOUR-CORNERS RGN ATTM WL
MOV VERY LTL...RMN QUASI-STNRY...THRU TNGT AND THEN MOV INTO NM SUN.
VIGOROUS SHRTWV ENERGY ROTATING AROUND THE CLSD UPR LOW SHOULD
PROVIDE THE PNHDLS WITH PLENTY OF UPR LVL DYNAMICS FOR CNVTV DVLPMT
LTR TDA AND TNGT...AND PRBLY RIGHT THRU SUN AS WELL.

SFC LOW OVR NRN CO ATTM FCSTD TO DROP SWD INTO SRN CO BY LTR TDA
AND THEN INTO NERN NM BY ERY SUN MRNG.  WRMFNT EXTENDS SEWD FM THE
SFC LOW OVR NERN NM ERY SUN AND THEN SEWD INTO N CNTRL TX.  CDFNT
PUSHING SEWD BHND THE SFC LOW ACRS WRN KS INTO NRN NM WL CONT TO
DROP SEWD AS THE SFC LOW MOVS SEWD.  DRYLN WL THEN EXTEND SWD FM THE
SFC LOW ALG THE TX/NM STATE LN.  THE TRIPLE POINT WHERE THESE
BNDRY/S INTERSECT SHOULD BE OVR THE EXTRM WRN TX PNHDL W OF KAMA.
IT APRS THE BIGGEST THREAT FOR CNVTN SUN WL BE MAINLY ACRS THE ERN
HALF OF THE FA.  CDFNT FCSTD TO MOV THRU THE NRN HALF OF THE
PNHDLS BY 18Z SUN OR SO AND THEN ACRS THE SRN HALF SUN AFTN...A LTL
LTR THAN PREVIOUSLY THOUGHT.

CNVTN SHOULD CONT SUN NGT INTO MON AS NELY UPSLP FLOW DVLPS AT THE
SFC WITH BUILDING SFC RDG BHND THE FNT AND UPR LOW RMNS IN THE
VCNTY OF THE PNHDLS.  SVR WX THREAT COULD PSBLY BCM A HVY
RNFL/FLOODING EVENT SUN NGT AND MON.  THIS WL NEED TO BE WATCHED
CLOSELY BY LTR SHIFTS.  OTRW...UPR LOW RMNS NRLY STNRY OVR THE KS
AND TX/OK PNHDLS RGN THRU ERY TUE.  WL KEEP POPS GOING INTO TUE.
UPR LOW KICKS OUT EWD AND WKNS INTO OPEN WAVE BY LT TUE INTO WED.
WL STILL KEEP SLGT CHC POPS FOR WED WRN/CNTRL SXNS...AND MAY
INTRODUCE THEM FOR THE ERN SXNS AS WELL.  WL ALSO PUT IN SLGT CHC
POPS FOR THU AS NWLY FLOW ALF MAY BRING IN SOME CNVTN FM NM.

PRELIM CCF:
AMA 053/070 047/066 048  5566
GUY 052/066 046/063 047  5666
DHT 051/069 045/064 046  5666

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

SCHNEIDER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 3:16 AM CDT	Severe Thunderstorm Warning	AMA	Roberts	59 min
Apr 30, 3:39 AM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Wheeler	66 min
Apr 30, 3:41 AM CDT	Severe Thunderstorm Warning	AMA	Gray	34 min
Apr 30, 4:15 AM CDT	Severe Thunderstorm Warning	AMA	Gray, Roberts	60 min
Apr 30, 4:46 AM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Wheeler	59 min
Apr 30, 9:34 AM CDT	Flash Flood Warning	AMA	Collingsworth	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2000 Every severe thunderstorm warning in 2000

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; radar from the NEXRAD Level II archive.