Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 83, NWS Amarillo, TX

May 20, 2001Dallam County, Sherman County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at May 20, 2001, 10:30 PM CDT for Dallam County, Sherman County, Texas. It was in force for 60 min. 1 report 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: May 20, 2001, 10:30 PM CDT (03:30 UTC)
Expired: May 20, 2001, 11:30 PM CDT
In force: 60 min
Issued by: NWS Amarillo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Dallam County, TX, Sherman County, TX

What was reported inside it

Time	Report	Where	Remark
May 20, 10:50 PM CDT	Thunderstorm Wind 56 E	Stratford, TX	Numerous trees reported blown down.

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 00:00Z, 3.5 hours before the alert went out and 129 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: 887 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1611 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 210332
SVRAMA
TXC111-421-210430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
1030 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DALLAM COUNTY IN THE TEXAS PANHANDLE
  SHERMAN COUNTY IN THE TEXAS PANHANDLE

* UNTIL 1130 PM CDT

* AT 1030 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 10 MILES NORTH OF DALHART TO 20
  MILES NORTHWEST OF WARE...MOVING SOUTHEAST AT 40 MPH.

* SOME LOCATIONS AFFECTED BY THESE STORMS INCLUDE...
  DALHART...STRATFORD...CONLEN AND WARE

DESTRUCTIVE WINDS CAN BE EXPECTED. IF YOU CANNOT GET UNDERGROUND...GO
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS!

LAT...LON 3616 10181 3613 10296 3665 10263 3644 10194

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 20, 9:15 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, May 20, 9:15 PM CDT, 1 hour 15 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
915 PM CDT SUN MAY 20 2001

ISSUED UPDT TO ZONES...ISSUING WND ADZY FOR ALL ZONES BUT SERN SXNS
OF TX PNHDL.  00Z SFC ANALYSIS INDCD VERY TIGHT PRES GRADIENT BHND
CDFNT...WITH 9 MB PER 3 HR PRES RISES OVR NERN CO.  TIGHT GRADIENT WL
DVLP/MOV SWD INTO FCST AREA DURG REST OF TNGT.  ALSO CALLED FOR AREAL
QUALIFIERS FOR TSTMS TNGT INSTEAD OF UNCERTAINTY TERMS.  PLENTY OF
CNVGNC ACMPYG CDFNT AND NOSE OF INCOMING H8 JETSTREAK.  NO CHANGES TO
LATER PDS.  03

.AMA...
TX...WND ADZY TONIGHT TX ZNS 01>10..11>13..16>18.
OK...WND ADZY TONIGHT OK ZNS 01>03.

COCKRELL/SLATTERY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 10:36 PM CDT	Severe Thunderstorm Warning	AMA	Hartley	54 min
May 20, 10:50 PM CDT	Severe Thunderstorm Warning	AMA	Hansford	55 min
May 20, 10:52 PM CDT	Severe Thunderstorm Warning	AMA	Moore	53 min
May 20, 11:45 PM CDT	Severe Thunderstorm Warning	AMA	Ochiltree	45 min
May 21, 12:09 AM CDT	Severe Thunderstorm Warning	AMA	Hemphill	36 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every 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.