Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 157, NWS Amarillo, TX

July 20, 2000Beaver County, Texas County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 20, 2000, 10:21 PM CDT for Beaver County, Texas County, Oklahoma. It was in force for 54 min. 4 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: Jul 20, 2000, 10:21 PM CDT (03:21 UTC)
Expired: Jul 20, 2000, 11:15 PM CDT
In force: 54 min
Issued by: NWS Amarillo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Beaver County, OK, Texas County, OK

The radar

The Dodge City radar (KDDC), 131 km from the middle of the area, began a volume at 03:22 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	Remark
Jul 20, 10:22 PM CDT	Thunderstorm Wind 52 E	Tyrone, OK	Fifteen railroad cars were blown over by the high winds.
Jul 20, 10:50 PM CDT	Thunderstorm Wind 52 E	Balko, OK
Jul 20, 11:00 PM CDT	Thunderstorm Wind 60 E	Beaver, OK	Fire Department reported four to five inch diameter tree limbs down.
Jul 20, 11:00 PM CDT	Thunderstorm Wind 61 M	Beaver, OK

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

Dodge City, (KDDC), launched 00:00Z, 3.4 hours before the alert went out and 136 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: 2430 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1215 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 531 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 54.8

Open this sounding in Storm Lab

The text

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

609 
WUUS54 KAMA 210322
SVRAMA
OKC007-139-210415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
1021 PM CDT THU JUL 20 2000

THE NATIONAL WEATHER SERVICE IN AMARILLO HAS ISSUED A

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

* UNTIL 1115 PM CDT

* AT 1015 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTHEAST OF HOOKER...OR ABOUT 9 MILES
  SOUTH OF LIBERAL...MOVING SOUTHEAST AT 15 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  BEAVER...ADAMS...BAKER...BALKO...BOYD...BRYANS CORNER...ELMWOOD...
  FLORIS...FORGAN...GRAY...HARDESTY...HOOKER...KNOWLES...MOCANE...
  TURPIN AND TYRONE

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

LAT...LON 3699 10105 3687 10128 3654 10122 3652 10048
          3697 10003

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 Jul 20, 8:45 PM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jul 20, 8:45 PM CDT, 1 hour 36 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
845 PM CDT THU JUL 20 2000

ISSUED UPDT TO ZONE FCSTS FOR OKLA PNHDL.  INCRSD PERCENTAGES OF
AREAL QUALIFIERS WEST...AND REPLACED LIKELY POPS IN WRN AND CNTRL
SXNS WITH CATEGORICAL RAIN AND TSTMS.  THIS WAS DONE DUE TO
RADAR TRENDS...AND STG CNVGNC OF SFC WNDS AND SFC THETA-E CONTG OVR
THIS AREA.  INCLUDED MENTION OF SVR IN WRN...IN ADDITION TO CNTRL AND
ERN SXNS ALREADY COVERED FM 345 PM ZONES.  ADJUSTED 1ST PD WNDS ALSO.
NO CHANGES TO LATER PDS.  03

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

COCKRELL/SLATTERY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 11:08 PM CDT	Severe Thunderstorm Warning	AMA	Beaver	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.