Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 27, NWS Amarillo, TX

April 10, 2001Cimarron County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 10, 2001, 8:31 PM CDT for Cimarron County, Oklahoma. It was in force for 44 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 10, 2001, 8:31 PM CDT (01:31 UTC)
Expired: Apr 10, 2001, 9:15 PM CDT
In force: 44 min
Issued by: NWS Amarillo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cimarron County, OK

The radar

The Amarillo radar (KAMA), 184 km from the middle of the area, began a volume at 01:33 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 10, 8:40 PM CDT	Thunderstorm Wind 56 M	Boise City, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 10, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.5 hours before the alert went out and 184 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: 579 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1839 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KAMA 110133
SVRAMA
OKC025-110215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
831 PM CDT TUE APR 10 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 915 PM CDT

* AT 831 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES EAST OF BOISE CITY...MOVING NORTHEAST
  AT 50 MPH.

* SOME LOCATIONS AFFECTED BY THE STORM INCLUDE...
  BOISE CITY...GRIGGS AND KEYES...AND U.S. HIGHWAY 56 NORTHEAST      
  OF BOISE CITY.

DESTRUCTIVE WINDS IN EXCESS OF 60 MPH 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 3700 10251 3652 10252 3652 10206 3700 10206

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 10, 3:45 PM CDT, 4 hours 46 minutes earlier.

Area forecast discussion, Apr 10, 3:45 PM CDT, 4 hours 46 minutes before

TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
345 PM CDT TUE APR 10 2001

SFC WAVE IS OVR N-CNTRL KS ATTM...SE OF HLC.  DRYLN EXTDS SWWD FM
THIS LOW THRU NWRN CORNER OF OK...TO JUST E OF AMA...TO JUST W OF
HOB.  SFC WAVE HAS TROF AXIS WHICH DIPS SWWD INTO WRN OK PNHDL...
THEN ARCS NWWD TO SFC LOW OVR CNTRL CO...NR LXV.  THIS LOW HAS BEEN
DEEPENING SGFNTLY DURG DAY WITH SFC TROF EXTDG SWD FM SAME THRU
CNTRL NM TO NR ELP.  PAC CDFNT MOVG THRU WRN NM...WITH -SN NOTED
OVR HIR SXNS OF AZ.  H5 LOW CURRENTLY NR CNTRL AZ...WITH COLD POOL
...STG DYNAMICS...AND DIFFLUENT FLOW...OVR AREA OF PRES FALLS...
CNTRL CO THRU SWRN NM.  DRYLN EXPCD TO RETREAT THIS EVE DUE TO
APCHG DYANMICS.

WITH INSTBY AND SHEAR EXPCD TO INCR OVR ERN ZNS...WL FCST NMRS TSTMS.
OVR CNTRL ZNS WL FCST SCT TSTMS...AND WL KEEP SLGT CHC TSTMS GOING
OVR WRN ZNS.  SVR TSTMS EXPCD...SPLY OVR ERN ZNS.  DRYLN...SFC
TROF...AND PAC CDFNT WL ALL MOV THRU PNHDLS BY ARND 06Z...WITH CNVGNC
INCRG THIS EVE.  PRES GRADIENT WL TIGHTEN ENOUGH TO WARRANT ISSUANCE
OF WND ADZY TNGT...AND WL LIKELY BE NEEDED THRU WED MRNG AS WELL.

WED NGT THRU TUE EXPCD TO BE UNEVENTFUL AS H5 FLOW TRENDS TO ZONAL...
AND THEN BACKS AGAIN AHEAD OF NEXT TROF ERY NEXT WK.  WK CDFNT MAY
ENTER FCST AREA ON TUE...BUT MSTR RTRN NOT ANTICIPATED PRIOR TO
FROPA.  03

.AMA...
TX...WIND ADVISORY TNGT TX ZNS 01>20.
OK...WIND ADVISORY TNGT OK ZNS 01>03.

COCKRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:55 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron	35 min
Apr 10, 11:06 PM CDT	Severe Thunderstorm Warning	AMA	Beaver, Texas	54 min
Apr 10, 11:37 PM CDT	Severe Thunderstorm Warning	AMA	Beaver	68 min
Apr 11, 12:18 AM CDT	Tornado Warning	AMA	Beaver	27 min

Nearby

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.