Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 40, NWS Amarillo, TX

May 11, 2002Beaver County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at May 11, 2002, 8:50 PM CDT for Beaver County, Oklahoma. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 11, 2002, 8:50 PM CDT (01:50 UTC)
Expired: May 11, 2002, 9:15 PM CDT
In force: 25 min
Issued by: NWS Amarillo, TX
Area: Counties, with a storm outline in the text

County Beaver County, OK

The radar

The Dodge City radar (KDDC), 116 km from the middle of the area, began a volume at 01:49 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 1.8 hours before the alert went out and 120 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1697 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 503 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 120150
SVRAMA
OKC007-120215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
850 PM CDT SAT MAY 11 2002

THE NATIONAL WEATHER SERVICE IN AMARILLO HAS ISSUED A

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

* UNTIL 915 PM CDT

* AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTH OF TURPIN...OR ABOUT 16 MILES
  SOUTH OF LIBERAL...MOVING EAST AT 45 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  BEAVER...TURPIN...MOCANE...KNOWLES...FORGAN...FLORIS...BRYANS
  CORNER AND BOYD

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 3698 10098 3657 10092 3679 10005 3699 10027

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 11, 3:15 PM CDT, 5 hours 35 minutes earlier.

Area forecast discussion, May 11, 3:15 PM CDT, 5 hours 35 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
315 PM CDT SAT MAY 11 2002

DRYLN HAS MIXED EWD PAST GUY...BGD...AND AMA.  FARTHER S...DRYLN
EXTDS SWWD TO NR HOB.  CDFNT LIES ACRS KS N OF DRYLN.  DEEP CNVGNC
ALG THIS FEATURE HAS RESULTED IN LN OF TCU SEEN ON SATL.  DEEP RICH
MSTR IN PLACE OVR PNHDLS AHD OF DRYLN...WITH SFC DWPTS IN LOWER TO
MID 60S...AND H8 DWPTS OF 10 TO 16 DEG C.  SFC-BASED CAPES AHD OF
DRYLN IN THE 2600 TO 3400 J/KG RANGE ATTM.  LEADING H5 VOT MAX
OVR WRN ZNS ATTM MAY HELP CAP BREAK.  110KT JET AT H2 WL PASS OVR
NRN SXNS...ALSO OFFERING SUPPORT FOR CNVTV DVLPMT.  CDFNT EXPCD
TO ENTER NRN ZNS AROUND MIDNIGHT.  STG NLY FLOW AND POOLING SFC
DWPTS BHND CDFNT WARRANT MENTION FO TSTMS WITH FROPA.

ON SUN...BREEZY CONDS EXPCD.  CAA WL MAKE FOR A MUCH COOLER DAY...
WITH POST-FRONTAL CLDS LINGERING OVR SRN ZNS.  POTENT MID-LVL
SHTWV TROF PASSING OVHD COULD PRODUCE POST-FRONTAL CNVTN.  BREEZY
CONDS EXPCD THRU SUN EVE...AND THEN WNDS DMSH AS SFC HI SETTLES IN.
DRY AMS RMNS OVHD SUN NGT THRU TUE. MSTR RTRN RESUMES WED WITH SLY
LOW-LVL FLOW...WITH WM CONDS AND SLGT CHC TSTMS THRU EXTDD.  03

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

COCKRELL

In the hours before

Local storm report, May 11, 6:52 PM CDT, 1 hour 58 minutes before

LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
652 PM CDT SAT MAY 11 2002

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1103 PM    10N HEREFORD              TX   2.50 INCH HAIL
05/10/02   DEAF SMITH                     REPORTED BY SKYWARN
                                          SPOTTER.

1108 PM    SIMMS                     TX   60 MPH WIND GUST
05/10/02   DEAF SMITH                     REPORTED BY SKYWARN
                                          SPOTTER.

1128 PM    BUSHLAND                  TX   1.00 INCH HAIL
05/10/02   POTTER                         REPORTED BY POTTER COUNTY
                                          EM.

1155 PM    2SW FRITCH                TX   1.75 INCH HAIL
05/10/02   RANDALL                        REPORTED BY HUTCHINSON
                                          COUNTY EM.

1205 AM    FRITCH                    TX   1.00 INCH HAIL
05/11/02   HUTCHINSON                     REPORTED BY FD.

1206 AM    SANFORD                   TX   1.00 INCH HAIL
05/11/02   HUTCHINSON                     REPORTED BY HUTCHINSON
                                          COUNTY EM.

1215 AM    STINNETT                  TX   1.00 INCH HAIL
05/11/02   HUTCHINSON                     REPORTED BY STINNETT
                                          COUNTY EM.

1215 AM    10N ADRIAN                TX   0.75 INCH HAIL
05/11/02   OLDHAM                         REPORTED BY SKYWARN
                                          SPOTTER.

1220 AM    11S SPEARMAN              TX   1.75 INCH HAIL
05/11/02   HUTCHINSON                     PUBLIC REPORT

1235 AM    2S HARTLEY                TX   0.75 INCH HAIL
05/11/02   HARTLEY                        PUBLIC REPORT

1240 AM    HARTLEY                   TX   60 MPH WIND GUST
05/11/02   HARTLEY                        REPORTED BY SKYWARN
                                          SPOTTER.

1254 AM    12SW PERRYTON             TX   0.88 INCH HAIL
05/11/02   OCHILTREE                      REPORTED BY PD.

0100 AM    PERRYTON                  TX   60 MPH WIND GUST
05/11/02   OCHILTREE                      REPORTED BY KEYE RADIO
                                          STATION

0104 AM    PERRYTON                  TX   0.88 INCH HAIL
05/11/02   OCHILTREE                      REPORTED BY PD.

0120 AM    1NW BOYS RANCH            TX   1.75 INCH HAIL
05/11/02   OLDHAM                         PUBLIC REPORT

0130 AM    1W BOYS RANCH             TX   1.75 INCH HAIL
05/11/02   OLDHAM                         REPORTED BY COOP
                                          OBSERVER

0250 AM    FORGAN                    OK   60 MPH WIND GUST
05/11/02   BEAVER                         ROOF OFF BARN AND RADIO
                                          TOWER DOWN. REPORTED BY
                                          EOC

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002 Every severe thunderstorm warning in 2002

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.