Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 18, NWS Fort Worth, TX

April 23, 2011Comanche County, Texas

NWS Fort Worth, TX issued this tornado warning at Apr 23, 2011, 9:28 PM CDT for Comanche County, Texas. It was in force for 47 min. 3 reports 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 23, 2011, 9:28 PM CDT (02:28 UTC)
Expired: Apr 23, 2011, 10:15 PM CDT
In force: 47 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Comanche County, TX

The radar

The Dyess AFB radar (KDYX), 90 km from the middle of the area, began a volume at 02:28 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 23, 10:06 PM CDT	HAIL 2.75	1 W Beattie, TX	BASEBALL SIZE HAIL JUST WEST OF BEATTIE
Apr 23, 10:10 PM CDT	HAIL 2.75	1 W Sidney, TX	GOLFBALL TO BASEBALL SIZE HAIL 1 MILE WEST OF SIDNEY
Apr 23, 10:20 PM CDT	HAIL 1.75	Comanche, TX	GOLFBALL SIZE HAIL IN COMANCHE

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 23, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.5 hours before the alert went out and 161 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: 2261 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1738 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

146 
WFUS54 KFWD 240228
TORFWD
TXC093-240315-
/O.NEW.KFWD.TO.W.0018.110424T0228Z-110424T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
928 PM CDT SAT APR 23 2011

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN COMANCHE COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 1015 PM CDT

* AT 928 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  DEVELOPING TORNADO 12 MILES WEST OF COMANCHE...MOVING EAST AT 15
  MPH.

* THE TORNADO WILL BE NEAR...
  COMANCHE AROUND 1015 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO AN INTERIOR BATHROOM...CLOSET...OR HALLWAY ON THE LOWEST
FLOOR OF YOUR BUILDING. COVER YOURSELF WITH BLANKETS...PILLOWS...OR A
MATTRESS FOR PROTECTION.

&&

LAT...LON 3204 9888 3203 9845 3188 9837 3176 9848
      3180 9875
TIME...MOT...LOC 0228Z 276DEG 12KT 3194 9878

$$

2 follow-up statements

174 
WWUS54 KFWD 240239
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
939 PM CDT SAT APR 23 2011

TXC093-240315-
/O.CON.KFWD.TO.W.0018.000000T0000Z-110424T0315Z/
COMANCHE TX-
939 PM CDT SAT APR 23 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR SOUTHERN
COMANCHE COUNTY...

AT 939 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
DEVELOPING TORNADO.  THIS TORNADO WAS LOCATED 8 MILES WEST OF
COMANCHE...MOVING SOUTHEAST AT 10 MPH.

THE TORNADO WILL BE NEAR...
  COMANCHE AROUND 1015 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO TORNADOES...BASEBALL TO GRAPEFRUIT HAIL AND DAMAGING 
WINDS ARE LIKELY WITH THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
SATURDAY EVENING FOR NORTHEASTERN TEXAS.

&&

LAT...LON 3197 9884 3204 9873 3203 9845 3188 9837
      3176 9848 3180 9875
TIME...MOT...LOC 0239Z 294DEG 8KT 3193 9873

$$

112 
WWUS54 KFWD 240252
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
952 PM CDT SAT APR 23 2011

TXC093-240315-
/O.CON.KFWD.TO.W.0018.000000T0000Z-110424T0315Z/
COMANCHE TX-
952 PM CDT SAT APR 23 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR SOUTHERN
COMANCHE COUNTY...

AT 952 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
DEVELOPING TORNADO.  THIS TORNADO WAS LOCATED 6 MILES WEST OF
COMANCHE...MOVING SOUTHEAST AT 10 MPH.

THE TORNADO WILL BE NEAR...
  COMANCHE AROUND 1015 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO TORNADOES...LARGE HAIL AND DAMAGING WINDS ARE LIKELY
WITH THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY
MORNING FOR NORTHEASTERN TEXAS. A SEVERE THUNDERSTORM WATCH ALSO
REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING FOR NORTHEASTERN
TEXAS.

&&

LAT...LON 3193 9882 3202 9871 3203 9845 3188 9837
      3176 9848 3180 9875
TIME...MOT...LOC 0252Z 294DEG 8KT 3192 9870

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 7:14 PM CDT	Areal Flood Advisory	FWD	Cooke, Grayson, Jack, Montague, Wise	117 min
Apr 23, 7:23 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Montague	53 min
Apr 23, 7:24 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Wise	66 min
Apr 23, 7:27 PM CDT	Areal Flood Advisory	FWD	Comanche, Eastland, Erath, Palo Pinto, Parker, Stephens	3 hr
Apr 23, 7:27 PM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto, Parker	78 min
Apr 23, 7:28 PM CDT	Tornado Warning	FWD	Cooke, Grayson	47 min
Apr 23, 7:29 PM CDT	Tornado Warning	FWD	Eastland, Erath, Palo Pinto	34 min
Apr 23, 7:37 PM CDT	Tornado Warning	FWD	Comanche, Eastland	38 min
Apr 23, 7:52 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Denton	53 min
Apr 23, 7:59 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Eastland, Erath	61 min
Apr 23, 8:10 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	50 min
Apr 23, 8:23 PM CDT	Tornado Warning	FWD	Comanche	52 min
Apr 23, 8:32 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Denton	37 min
Apr 23, 8:59 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Erath	61 min
Apr 23, 9:08 PM CDT	Tornado Warning	FWD	Comanche, Erath	29 min
Apr 23, 9:34 PM CDT	Severe Thunderstorm Warning	FWD	Fannin, Grayson	56 min
Apr 23, 9:50 PM CDT	Special Weather Statement	FWD	Collin, Dallas, Denton, Tarrant	85 min
Apr 23, 9:55 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker, Somervell	65 min
Apr 23, 10:13 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	62 min
Apr 23, 10:34 PM CDT	Areal Flood Advisory	FWD	Comanche, Erath	3 hr
Apr 23, 10:42 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Tarrant	48 min
Apr 23, 11:19 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Denton	56 min
Apr 23, 11:36 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Erath	29 min
Apr 24, 1:09 AM CDT	Special Weather Statement	FWD	Dallas, Tarrant	51 min
Apr 24, 1:49 PM CDT	Fire Weather Watch	FWD	Comanche, Eastland, Erath, Hamilton, Jack, Mills and 3 more	15 hr
Apr 24, 3:17 PM CDT	Special Weather Statement	FWD	Eastland, Stephens	28 min
Apr 24, 3:56 PM CDT	Severe Thunderstorm Warning	FWD	Stephens	64 min
Apr 24, 4:32 PM CDT	Severe Thunderstorm Warning	FWD	Stephens	28 min
Apr 24, 4:47 PM CDT	Special Weather Statement	FWD	Palo Pinto	28 min
Apr 24, 4:56 PM CDT	Tornado Warning	FWD	Palo Pinto, Stephens	49 min
Apr 24, 5:18 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Palo Pinto	42 min
Apr 24, 5:56 PM CDT	Severe Thunderstorm Warning	FWD	Eastland, Stephens	64 min
Apr 24, 5:59 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Palo Pinto, Parker, Wise	61 min
Apr 24, 6:22 PM CDT	Tornado Warning	FWD	Eastland, Stephens	38 min
Apr 24, 6:33 PM CDT	Special Weather Statement	FWD	Denton, Tarrant	27 min
Apr 24, 6:37 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Parker, Tarrant, Wise	38 min
Apr 24, 6:55 PM CDT	Tornado Warning	FWD	Eastland, Erath, Palo Pinto, Stephens	50 min
Apr 24, 6:59 PM CDT	Special Weather Statement	FWD	Cooke	31 min

Nearby

Tornado Warnings in Texas, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.