Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 3, NWS Fort Worth, TX

April 11, 2011Hamilton County, Texas

NWS Fort Worth, TX issued this tornado warning at Apr 11, 2011, 12:25 AM CDT for Hamilton County, Texas. It was in force for 20 min. 2 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 11, 2011, 12:25 AM CDT (05:25 UTC)
Expired: Apr 11, 2011, 12:45 AM CDT
In force: 20 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Hamilton County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 110 km from the middle of the area, began a volume at 05:27 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 11, 12:35 AM CDT	TSTM WND GST 64	Hamilton, TX
Apr 11, 12:54 AM CDT	TSTM WND DMG	Cranfills Gap, TX	GLASS BROKEN AT A BANK

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 10, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Apr 10, 11:39 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.4 hours before the alert went out and 135 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: 637 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 1994 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

471 
WFUS54 KFWD 110525
TORFWD
TXC193-110545-
/O.NEW.KFWD.TO.W.0003.110411T0525Z-110411T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
1225 AM CDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN HAMILTON COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 1245 AM CDT

* AT 1226 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  DEVELOPING TORNADO NEAR HAMILTON...MOVING NORTHEAST AT 60 MPH.

* THE TORNADO WILL BE NEAR...
  CRANFILLS GAP AROUND 1240 AM 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT MONDAY MORNING FOR
EASTERN TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT
UNTIL 500 AM CDT MONDAY MORNING FOR NORTHEASTERN TEXAS.

&&

LAT...LON 3187 9790 3171 9778 3170 9778 3159 9811
      3173 9819
TIME...MOT...LOC 0526Z 247DEG 51KT 3170 9806

$$


85/NH

2 follow-up statements

653 
WWUS54 KFWD 110534
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1234 AM CDT MON APR 11 2011

TXC193-110545-
/O.CON.KFWD.TO.W.0003.000000T0000Z-110411T0545Z/
HAMILTON TX-
1234 AM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT FOR EASTERN
HAMILTON COUNTY...

AT 1235 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
DEVELOPING TORNADO.  THIS TORNADO WAS LOCATED 8 MILES EAST OF
HAMILTON...MOVING NORTHEAST AT 60 MPH.

THE TORNADO WILL BE NEAR...
  CRANFILLS GAP AROUND 1245 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT MONDAY MORNING FOR
EASTERN TEXAS.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 500 AM CDT
MONDAY MORNING FOR NORTHEASTERN TEXAS.

&&

LAT...LON 3187 9790 3171 9778 3170 9778 3159 9811
      3173 9819
TIME...MOT...LOC 0535Z 247DEG 51KT 3171 9794

$$

301 
WWUS54 KFWD 110543
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1243 AM CDT MON APR 11 2011

TXC193-110553-
/O.EXP.KFWD.TO.W.0003.000000T0000Z-110411T0545Z/
HAMILTON TX-
1243 AM CDT MON APR 11 2011

...THE TORNADO WARNING FOR EASTERN HAMILTON COUNTY EXPIRES AT 1245 AM
CDT...

AT 1243 AM CDT THE SEVERE THUNDERSTORM THAT PROMPTED THE TORNADO
WARNING WEAKENED AND WAS NO LONGER CAPABLE OF PRODUCING A TORNADO.
THE TORNADO WARNING HAS EXPIRED.

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS WERE
STILL POSSIBLE FROM THE THUNDERSTORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT MONDAY MORNING FOR
EASTERN TEXAS.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 500 AM CDT
MONDAY MORNING FOR NORTHEASTERN TEXAS.

LAT...LON 3187 9790 3171 9778 3170 9778 3159 9811
      3173 9819
TIME...MOT...LOC 0543Z 247DEG 51KT 3175 9781

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:05 PM CDT	Special Weather Statement	FWD	Palo Pinto	25 min
Apr 10, 7:17 PM CDT	Special Weather Statement	FWD	Montague	28 min
Apr 10, 7:31 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Palo Pinto, Parker	59 min
Apr 10, 7:42 PM CDT	Special Weather Statement	FWD	Cooke, Montague	33 min
Apr 10, 7:48 PM CDT	Severe Thunderstorm Warning	FWD	Eastland	57 min
Apr 10, 8:13 PM CDT	Special Weather Statement	FWD	Cooke	32 min
Apr 10, 8:18 PM CDT	Special Weather Statement	FWD	Wise	27 min
Apr 10, 8:32 PM CDT	Special Weather Statement	FWD	Wise	28 min
Apr 10, 8:49 PM CDT	Special Weather Statement	FWD	Eastland, Palo Pinto	26 min
Apr 10, 9:09 PM CDT	Special Weather Statement	FWD	Palo Pinto	36 min
Apr 10, 9:25 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker	44 min
Apr 10, 9:32 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Eastland	46 min
Apr 10, 9:38 PM CDT	Special Weather Statement	FWD	Jack	37 min
Apr 10, 9:47 PM CDT	Tornado Warning	FWD	Parker	22 min
Apr 10, 9:56 PM CDT	Special Weather Statement	FWD	Montague	34 min
Apr 10, 9:59 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	35 min
Apr 10, 10:09 PM CDT	Special Weather Statement	FWD	Erath	36 min
Apr 10, 10:16 PM CDT	Severe Thunderstorm Warning	FWD	Montague	59 min
Apr 10, 10:20 PM CDT	Severe Thunderstorm Warning	FWD	Erath	34 min
Apr 10, 10:45 PM CDT	Special Weather Statement	FWD	Grayson	30 min
Apr 10, 11:04 PM CDT	Special Weather Statement	FWD	Eastland	26 min
Apr 10, 11:17 PM CDT	Special Weather Statement	FWD	Denton, Parker, Wise	28 min
Apr 10, 11:22 PM CDT	Severe Thunderstorm Warning	FWD	Mills	68 min
Apr 10, 11:52 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Coryell, Hamilton, Lampasas, Mills	53 min
Apr 10, 11:53 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Denton, Tarrant	37 min
Apr 11, 12:05 AM CDT	Severe Thunderstorm Warning	FWD	Grayson	39 min
Apr 11, 12:23 AM CDT	Severe Thunderstorm Warning	FWD	Collin, Denton	52 min
Apr 11, 12:28 AM CDT	Severe Thunderstorm Warning	FWD	Bosque, Coryell, Hamilton	62 min
Apr 11, 12:41 AM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	64 min
Apr 11, 12:47 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Grayson	58 min
Apr 11, 12:49 AM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Somervell	41 min
Apr 11, 12:55 AM CDT	Severe Thunderstorm Warning	FWD	Hill	35 min
Apr 11, 1:15 AM CDT	Tornado Warning	FWD	Johnson	21 min
Apr 11, 1:23 AM CDT	Severe Thunderstorm Warning	FWD	Ellis, Hill, Johnson, Navarro	51 min
Apr 11, 1:34 AM CDT	Severe Thunderstorm Warning	FWD	Dallas	43 min
Apr 11, 1:35 AM CDT	Tornado Warning	FWD	Ellis	25 min
Apr 11, 1:53 AM CDT	Severe Thunderstorm Warning	FWD	Henderson, Kaufman	52 min
Apr 11, 2:01 AM CDT	Tornado Warning	FWD	Dallas, Kaufman	30 min
Apr 11, 2:13 AM CDT	Tornado Warning	FWD	Hunt, Kaufman, Rockwall	35 min
Apr 11, 2:19 AM CDT	Severe Thunderstorm Warning	FWD	Rains, Van Zandt	56 min
Apr 11, 2:38 AM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Hunt	52 min
Apr 11, 2:59 AM CDT	Special Weather Statement	FWD	Navarro	31 min
Apr 11, 3:27 AM CDT	Special Weather Statement	FWD	Henderson	33 min
Apr 11, 4:07 AM CDT	Special Weather Statement	FWD	Henderson	23 min
Apr 11, 4:14 AM CDT	Special Weather Statement	FWD	Falls	31 min
Apr 11, 5:05 AM CDT	Special Weather Statement	FWD	Milam	25 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.