Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 39, NWS Amarillo, TX

April 21, 2001Ochiltree County, Texas; Beaver County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 21, 2001, 9:02 PM CDT for Ochiltree County, Texas; Beaver County, Oklahoma. It was in force for 43 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: Apr 21, 2001, 9:02 PM CDT (02:02 UTC)
Expired: Apr 21, 2001, 9:45 PM CDT
In force: 43 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), 146 km from the middle of the area, began a volume at 02:05 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
Apr 21, 9:05 PM CDT	Hail 0.88	Perryton, TX

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, 2.0 hours before the alert went out and 149 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: 1118 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1940 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 365 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 12.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 220202
SVRAMA
OKC007-TXC357-220245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
902 PM CDT SAT APR 21 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 945 PM CDT

* AT 902 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHWEST OF WOLF CREEK PARK...OR ABOUT
  10 MILES SOUTH OF PERRYTON...MOVING NORTHEAST AT 60 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  BEAVER...PERRYTON...BALKO...ELMWOOD...FORGAN...MOCANE AND WOLF
  CREEK PARK

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

LAT...LON 3683 10003 3694 10058 3615 10106 3610 10063
          3621 10054 3649 10055 3650 10030

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 21, 2:44 PM CDT, 6 hours 18 minutes earlier.

Area forecast discussion, Apr 21, 2:44 PM CDT, 6 hours 18 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
244 PM CDT SAT APR 21 2001

ATMOSPHERE IS GETTING QUITE UNSTABLE EAST OF THE DRYLINE IN
WESTERN OKLAHOMA AND THE EASTERN TEXAS AND OKLAHOMA PANHANDLES.
SURFACE COLD FRONT STILL LIES ACROSS THE NORTHERN TEXAS PANHANDLE.
THIS BOUNDARY IS SHOWING SOME SIGNS OF MOVING NORTHWARD AS BGD HAS
NOW SWITCHED AROUND TO THE SOUTHWEST. WOULD NOT BE SURPRISED TO SEE
THE DRYLINE AND THE INTERSECTION BETWEEN THE COLD FRONT AND DRYLINE
SET OFF A FEW STORMS THIS AFTERNOON. STORMS COULD QUICKLY BECOME
SEVERE AS STRONG INSTABILITY BREAKS THROUGH WHAT CAP THERE IS.

STRONG TO SEVERE STORMS ARE EXPECTED ACROSS MUCH OF THE PANHANDLES
OVERNIGHT AS LOW LEVEL JET COMBINES WITH UPPER LOW PUSHING EAST
ACROSS NEW MEXICO. PLENTY OF MOISTURE WILL BE BROUGHT BACK TO THE
WESTERN ZONES TO MEET UP WITH THE DYNAMICS COMING OUT OF THE
ROCKIES. WILL GO WITH HIGHEST POPS TONIGHT AHEAD OF DYNAMICS.
DRYLINE TEAMS UP WITH PACIFIC COLD FRONT LATE TONIGHT AND DRIVES
EAST...SO WILL TAPER OFF POPS TO THE WEST ON SUNDAY AS THE SYSTEM
MOVES INTO THE CENTRAL HIGH PLAINS.  STORMS SHOULD MOVE EAST AND
NORTHEAST QUICKLY AS WINDS ALOFT INCREASE WITH JET STREAK AROUND
THE EASTERN SIDE OF THE UPPER LOW.

MODELS MAY BE CATCHING ON TO THE COLD AIR BEHIND THE FRONT WHICH
MOVES THROUGH SUNDAY NIGHT. WE WILL LOWER SOME TEMPERATURES FOR
MONDAY WITH THIS IN MIND.

UPPER LEVEL RIDGE STARTS TO BUILD BACK ACROSS THE ROCKIES THROUGH
MID WEEK...SO WARMER TEMPERATURES LOOK TO BE ON TRACK. WE WILL
INSERT SOME SLIGHT CHANCE POPS FOR THE WEST AND CENTRAL ON THURSDAY
AND FRIDAY. SEVERAL RIPPLES (SHORT WAVES) MOVE THROUGH THE MEAN
RIDGE OVER THE ROCKIES/HIGH PLAINS IN THE SOUTHERN STREAM. SOME
CONVECTION MAY FORM ALONG THE ROCKIES AND MOVE INTO THE AREA.  WILL
LEAVE SATURDAY DRY FOR NOW AS RIDGE AXIS MOVES ACROSS THE
PANHANDLES AHEAD OF NEXT STRONG UPPER LOW ALONG THE WEST COAST.

WE USED A BLEND OF THE MODELS FOR THIS FORECAST. THE ETA HAD A
BETTER HANDLE ON THE SURFACE...WHILE THE AVN HAD A BETTER HANDLE ON
THE UPPER AIR FEATURES.

A FEW NUMBERS TO PONDER:

DHT 51/71 38/64 36 730
AMA 57/74 40/66 39 750
BVR 60/79 45/65 39 660

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

GOEHRING

In the hours before

Local storm report, Apr 21, 6:02 PM CDT, 3 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
602 PM CDT SAT APR 21 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....
g
0555 PM    5 W CLARENDEN             TX   1.00 INCH HAIL
04/21/01   DONLEY                         OFF DUTY NWS FORECASTER

Local storm report, Apr 21, 6:05 PM CDT, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
605 PM CDT SAT APR 21 2001

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

0555 PM    5 W CLARENDEN             TX   1.00 INCH HAIL
04/21/01   DONLEY                         OFF DUTY NWS FORECASTER

Local storm report, Apr 21, 6:16 PM CDT, 2 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
616 PM CDT SAT APR 21 2001

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

0555 PM    5NW CLARENDON             TX   1.00 INCH HAIL
04/21/01   DONLEY                         OFF DUTY NWS FORECASTER

Local storm report, Apr 21, 6:25 PM CDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
625 PM CDT SAT APR 21 2001

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

0555 PM    5NW CLARENDON             TX   1.00 INCH HAIL
04/21/01   DONLEY                         OFF DUTY NWS FORECASTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 8:54 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	51 min
Apr 21, 9:14 PM CDT	Severe Thunderstorm Warning	AMA	Randall	46 min
Apr 21, 9:31 PM CDT	Severe Thunderstorm Warning	AMA	Potter	44 min
Apr 21, 9:41 PM CDT	Severe Thunderstorm Warning	AMA	Oldham	34 min
Apr 21, 9:51 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson, Moore	24 min
Apr 21, 9:56 PM CDT	Severe Thunderstorm Warning	AMA	Carson	34 min
Apr 21, 10:28 PM CDT	Severe Thunderstorm Warning	AMA	Hansford	47 min
Apr 22, 8:35 AM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson	55 min
Apr 22, 10:55 AM CDT	Severe Thunderstorm Warning	AMA	Collingsworth	35 min
Apr 22, 9:22 AM CDT	Severe Thunderstorm Warning	AMA	Beaver	53 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.