Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 101, NWS Amarillo, TX

April 30, 2012Collingsworth County, Donley County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 30, 2012, 9:27 PM CDT for Collingsworth County, Donley County, Texas. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 30, 2012, 9:27 PM CDT (02:27 UTC)
Expired: Apr 30, 2012, 10:30 PM CDT
In force: 63 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Collingsworth County, TX, Donley County, TX

The radar

The Altus AFB radar (KFDR), 118 km from the middle of the area, began a volume at 02:26 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 30, 10:00 PM CDT	HAIL 1	1 S Dodson, TX	MOSTLY NICKEL TO QUARTER SIZE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 30, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 30, 5:42 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.5 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2953 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 266 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.

296 
WUUS54 KAMA 010227
SVRAMA
TXC087-129-010330-
/O.NEW.KAMA.SV.W.0101.120501T0227Z-120501T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
927 PM CDT MON APR 30 2012

THE NATIONAL WEATHER SERVICE IN AMARILLO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN COLLINGSWORTH COUNTY IN THE PANHANDLE OF TEXAS
  SOUTHEASTERN DONLEY COUNTY IN THE PANHANDLE OF TEXAS

* UNTIL 1030 PM CDT

* AT 927 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETECTED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE
  DAMAGING HAIL UP TO GOLF BALL SIZE.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM WELLINGTON TO 13 MILES SOUTHWEST OF
  QUAIL...OR ALONG A LINE EXTENDING FROM WELLINGTON TO MEMPHIS...
  MOVING EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DODSON...
  WELLINGTON...
  QUAIL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCED WARNING. IF A TORNADO IS SPOTTED...ACT QUICKLY
AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A
BASEMENT OR SMALL INTERIOR ROOM.

TO REPORT SEVERE WEATHER...PLEASE CALL THE NATIONAL WEATHER SERVICE
AT 8 0 6 3 3 5 1 1 2 1.

&&

LAT...LON 3474 10000 3475 10066 3497 10060 3500 10000
      3486 10000 3485 9999 3482 9999 3475 9999
TIME...MOT...LOC 0227Z 292DEG 21KT 3480 10016 3476 10054

$$

CLK

4 follow-up statements

727 
WWUS54 KAMA 010237
SVSAMA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
937 PM CDT MON APR 30 2012

TXC087-129-010330-
/O.CON.KAMA.SV.W.0101.000000T0000Z-120501T0330Z/
DONLEY TX-COLLINGSWORTH TX-
937 PM CDT MON APR 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHERN COLLINGSWORTH AND EXTREME SOUTHEASTERN DONLEY
COUNTIES...

AT 937 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL UP TO SOFTBALL SIZE.  THESE STORMS WERE LOCATED ALONG A
LINE EXTENDING FROM DODSON TO 13 MILES SOUTHWEST OF QUAIL...OR ALONG
A LINE EXTENDING FROM 8 MILES SOUTHEAST OF WELLINGTON TO MEMPHIS...
MOVING EAST AT 25 MPH.

THE LINE OF SEVERE THUNDERSTORMS WILL OTHERWISE REMAIN OVER MAINLY
RURAL AREAS OF THE INDICATED COUNTY.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS.

TO REPORT SEVERE WEATHER...PLEASE CALL THE NATIONAL WEATHER SERVICE
AT 8 0 6 3 3 5 1 1 2 1.

LAT...LON 3486 10000 3475 9999 3474 10000 3475 10055
      3498 10050 3500 10000
TIME...MOT...LOC 0237Z 292DEG 21KT 3477 10010 3474 10048

$$

CLK

518 
WWUS54 KAMA 010248
SVSAMA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
948 PM CDT MON APR 30 2012

TXC087-129-010330-
/O.CON.KAMA.SV.W.0101.000000T0000Z-120501T0330Z/
DONLEY TX-COLLINGSWORTH TX-
948 PM CDT MON APR 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHERN COLLINGSWORTH AND EXTREME SOUTHEASTERN DONLEY
COUNTIES...

AT 948 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
DODSON TO 9 MILES SOUTHWEST OF WELLINGTON...OR ALONG A LINE EXTENDING
FROM 13 MILES SOUTHEAST OF WELLINGTON TO 9 MILES SOUTHWEST OF
WELLINGTON...MOVING EAST AT 25 MPH.

THE LINE OF SEVERE THUNDERSTORMS WILL OTHERWISE REMAIN OVER MAINLY
RURAL AREAS OF THE INDICATED COUNTY.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS.

TO REPORT SEVERE WEATHER...PLEASE CALL THE NATIONAL WEATHER SERVICE
AT 8 0 6 3 3 5 1 1 2 1.

LAT...LON 3490 10000 3486 10000 3475 9999 3474 10000
      3475 10055 3487 10052
TIME...MOT...LOC 0248Z 292DEG 21KT 3475 10000 3475 10031

$$

CLK

551 
WWUS54 KAMA 010316
SVSAMA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
1016 PM CDT MON APR 30 2012

TXC129-010326-
/O.CAN.KAMA.SV.W.0101.000000T0000Z-120501T0330Z/
DONLEY TX-
1016 PM CDT MON APR 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHEASTERN DONLEY
COUNTY IS CANCELLED...

AT 1016 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAD 
MOVED OUT OF THE COUNTY. THEREFORE THE SEVERE THUNDERSTORM WARNING 
IS CANCELLED.

LAT...LON 3475 10027 3488 10026 3490 10000 3486 10000
      3475 9999 3474 10000
TIME...MOT...LOC 0316Z 292DEG 21KT 3477 9992 3477 10023

$$

TXC087-010330-
/O.CON.KAMA.SV.W.0101.000000T0000Z-120501T0330Z/
COLLINGSWORTH TX-
1016 PM CDT MON APR 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHEASTERN COLLINGSWORTH COUNTY...

AT 1013 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
DODSON TO 6 MILES SOUTH OF WELLINGTON...MOVING EAST AT 25 MPH.

THE LINE OF SEVERE THUNDERSTORMS WILL OTHERWISE REMAIN OVER MAINLY
RURAL AREAS OF THE INDICATED COUNTY.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS.

TO REPORT SEVERE WEATHER...PLEASE CALL THE NATIONAL WEATHER SERVICE
AT 8 0 6 3 3 5 1 1 2 1.

LAT...LON 3475 10027 3488 10026 3490 10000 3486 10000
      3475 9999 3474 10000
TIME...MOT...LOC 0316Z 292DEG 21KT 3477 9992 3477 10023

$$

JOHNSON

846 
WWUS54 KAMA 010324
SVSAMA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
1024 PM CDT MON APR 30 2012

TXC087-010334-
/O.EXP.KAMA.SV.W.0101.000000T0000Z-120501T0330Z/
COLLINGSWORTH TX-
1024 PM CDT MON APR 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COLLINGSWORTH
COUNTY WILL EXPIRE AT 1030 PM CDT...

AT 1024 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAD
EXITED THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM WARNING
WILL BE ALLOWED TO EXPIRE.

LAT...LON 3475 10027 3488 10026 3490 10000 3486 10000
      3475 9999 3474 10000
TIME...MOT...LOC 0324Z 292DEG 21KT 3475 9987 3475 10018

$$

JOHNSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:04 PM CDT	Areal Flood Advisory	AMA	Armstrong	3 hr
Apr 30, 7:13 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Collingsworth, Donley, Gray, Wheeler	62 min
Apr 30, 7:37 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley	53 min
Apr 30, 7:52 PM CDT	Severe Thunderstorm Warning	AMA	Donley	53 min
Apr 30, 8:16 PM CDT	Severe Thunderstorm Warning	AMA	Donley	22 min
Apr 30, 8:30 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley	60 min
Apr 30, 8:48 PM CDT	Severe Thunderstorm Warning	AMA	Donley	27 min
Apr 30, 8:49 PM CDT	Flash Flood Warning	AMA	Collingsworth, Donley	3 hr
Apr 30, 11:38 PM CDT	Areal Flood Warning	AMA	Collingsworth, Donley	12 hr
May 1, 3:54 PM CDT	Fire Weather Watch	AMA	Dallam, Deaf Smith, Hartley, Oldham	12 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.