Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 88, NWS Amarillo, TX

May 20, 2001Ochiltree County, Texas; Beaver County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at May 20, 2001, 11:45 PM CDT for Ochiltree County, Texas; Beaver County, Oklahoma. It was in force for 45 min. No storm report in the archive falls 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.

The facts

Issued: May 20, 2001, 11:45 PM CDT (04:45 UTC)
Expired: May 21, 2001, 12:30 AM CDT
In force: 45 min
Issued by: NWS Amarillo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Beaver County, OK, Ochiltree County, TX

The radar

The Dodge City radar (KDDC), 158 km from the middle of the area, began a volume at 04:48 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 20, 11:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 4.8 hours before the alert went out and 161 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: 184 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1698 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 210447
SVRAMA
OKC007-TXC357-210530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
1145 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BEAVER COUNTY IN THE OKLAHOMA PANHANDLE
  OCHILTREE COUNTY IN THE TEXAS PANHANDLE

* UNTIL 1230 AM CDT

* AT 1145 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER FARNSWORTH...OR ABOUT 11 MILES WEST OF
  PERRYTON...MOVING NORTHEAST AT 20 MPH. OTHER SEVER STORMS WERE
  LOCATED NEAR BEAVER MOVING EAST AT 20 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  BEAVER...PERRYTON...BALKO...BOYD...BRYANS CORNER...ELMWOOD...
  FLORIS...FORGAN...GRAY...MOCANE...FARNSWORTH AND WAKA

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 3634 10115 3620 10100 3613 10067 3649 10063
          3657 10046 3684 10019 3698 10071 3648 10094

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, 2 hours 30 minutes earlier.

Area forecast discussion, May 20, 9:15 PM CDT, 2 hours 30 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, 10:30 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	60 min
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 21, 12:09 AM CDT	Severe Thunderstorm Warning	AMA	Hemphill	36 min
May 20, 10:12 PM CDT	Severe Thunderstorm Warning	AMA	Texas	63 min
May 20, 10:22 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron	38 min
May 20, 10:43 PM CDT	Severe Thunderstorm Warning	AMA	Beaver	62 min
May 20, 11:08 PM CDT	Tornado Warning	AMA	Beaver, Texas	37 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Severe Thunderstorm Warnings in Oklahoma, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.