Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 50, NWS Amarillo, TX

April 30, 2001Beaver County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 30, 2001, 8:15 PM CDT for Beaver County, Oklahoma. It was in force for 60 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
Apr 30, 2001, 8:15 PM CDT (01:15 UTC)
Expired
Apr 30, 2001, 9:15 PM CDT
In force
60 min
Issued by
NWS Amarillo, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Beaver County, OK

The radar

The Dodge City radar (KDDC), 126 km from the middle of the area, began a volume at 01:15 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 nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 1.3 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-pSkew-T log-p diagram, Dodge City, at 00:00Z on 2001-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 85 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 00:00Z on 2001-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
85 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
3013 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 010116
SVRAMA
OKC007-010215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
815 PM CDT MON APR 30 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 915 PM CDT

* AT 815 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES SOUTH OF BEAVER...MOVING SOUTH AT 10 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  ELMWOOD

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

LAT...LON 3678 10036 3676 10062 3651 10064 3651 10g029

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 30, 4:25 PM CDT, 3 hours 50 minutes earlier.

Area forecast discussion, Apr 30, 4:25 PM CDT, 3 hours 50 minutes before
TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
425 PM CDT MON APR 30 2001

MAIN MID LEVEL SHORTWAVE PASSING WELL TO THE NORTH OF RGN TODAY HAS
BEEN UNDERGOING SHEAR ALONG ITS BASE WITH ENERGY BEING DRAWN BACK SW
OVER THE PNHDLS. MEANWHILE...WEAK SFC TROUGH HAS REMAINED NEARLY
STATIONARY MOST OF THE DAY...MEANDERING FROM N CNTRL KS...SSWWD
ACROSS THE PNHDLS AND INTO SERN NM.

ABOVE FACTORS COMBINED WITH MODERATE INSTABILITY...HAVE DECIDED TO
CONTINUE FIRST PERIOD FCST ALONG SAME LINES AS AFTN UPDATE...I.E.
SLIGHT CHANCE/CHANCE OF EARLY EVENG SHRA AND TSRA. INCREASING SWLY
DOWNSLOPE FLOW WILL COMBINE WITH MID-LVL THERMAL RIDGE OVER HIER
TRRN OF NM ON TUE TO CREATE VERY WARM DAY FOR THE PNHDLS. HOWEVER...
WARM TEMPS WILL BE SHORT-LIVED AS ANOTHER COLD FRONT IS EXPECTED TO
REVISIT THE AREA BY LATE WED. SHORT RANGE MODELS FCST THIS SCENARIO
TO VARYING DEGREES WITH THE ETA FARTHEST SOUTH FRONTAL MOVEMENT.
THEREFORE...CONFIDENCE REMAINS MODERATE AT BEST REGARDING FRONT/S
MOVEMENT. AT THIS TIME...BELIEVE THAT FRONT WILL PUSH SOUTH ACROSS
THE OK PNHDL WED MORNG AND THE TX PNHDL WED AFTN. MEANWHILE...
SHORTWAVE MOVING E ACROSS THE NERN PACIFIC WILL DIVE SE AND DEEPEN
IN WAKE OF CURRENT NRN STREAM WAVE. BY EARLY THU...SAID WAVE SHOULD
BE CUTOFF OVER NRN AZ. MOVEMENT OF CLOSED LOW WILL BE RATHER SLOW...
PERHAPS NOT LIFTING OUT UNTIL LATE SAT. THIS MAY VERY WELL SET THE
STAGE FOR THE MOST SIGNIFICANT WIDESPREAD RAINFALL THE TX/OK PNHDLS
HAS EXPERIENCED IN A WHILE...PARTICULARLY IF SFC FRONT STALLS ACROSS
THE FAR SRN TX PNHDL. COLD FRONT MAY LIFT BACK N AS WARM FRONT BY
FRI WITH DRYLINE DEVELOPING BY MID-DAY WITH CHANCE FOR STRONG
CONVECTION.

CONFIDENCE DIMINISHES CONSIDERABLY DURING THE SECOND HALF FO THE
EXTENDED AS LATEST MEDIUM RANGE MODELS BEGIN TO DIVERGE BY SAT.
ASIDE FROM MAINTAINING PERSISTENCE INTO MON...LITTLE CHANGE IN THE
FCST.

.AGMA...
TX...NONE.
OK...NONE.

JH

In the hours before

Special weather statement, Apr 30, 5:41 PM CDT, 2 hours 34 minutes before
TXZ012-017-010300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
541 PM CDT MON APR 30 2001

TXZ012-017-010300-
THE NATIONAL WEATHER SERVICE IN AMARILLO HAS CLEARED THE FOLLOWING
COUNTIES FROM SEVERE THUNDERSTORM WATCH 181. COUNTIES CLEARED
INCLUDE:

IN THE TEXAS PANHANDLE:
POTTER...RANDALL...

THIS INCLUDES THE CITIES OF...AMARILLO...CANYON...

SCHNEIDER

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001Every 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.