Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 112, NWS Fort Worth, TX

May 4, 2012Hamilton County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 4, 2012, 10:02 PM CDT for Hamilton County, Texas. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 4, 2012, 10:02 PM CDT (03:02 UTC)
Expired: May 4, 2012, 10:30 PM CDT
In force: 28 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Hamilton County, TX

The radar

The Ft Hood radar (KGRK), 134 km from the middle of the area, began a volume at 03:02 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 4, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 3.0 hours before the alert went out and 158 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: 2627 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1899 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

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

405 
WUUS54 KFWD 050302
SVRFWD
TXC193-050330-
/O.NEW.KFWD.SV.W.0112.120505T0302Z-120505T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
1002 PM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HAMILTON COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 1030 PM CDT

* AT 1002 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 17 MILES
  SOUTHWEST OF HAMILTON...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HAMILTON AROUND 1025 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO A STURDY SHELTER UNTIL THE STORM HAS
PASSED.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A STRONG BUILDING AND
STAY INSIDE...AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3169 9844 3190 9794 3168 9777 3142 9827
      3164 9844 3166 9845
TIME...MOT...LOC 0302Z 281DEG 25KT 3159 9835

$$

1 follow-up statement

962 
WWUS54 KFWD 050328
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1028 PM CDT FRI MAY 4 2012

TXC193-050338-
/O.EXP.KFWD.SV.W.0112.000000T0000Z-120505T0330Z/
HAMILTON TX-
1028 PM CDT FRI MAY 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR HAMILTON COUNTY EXPIRES AT
1030 PM CDT...

AT 1028 PM CDT THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING
WEAKENED AND WAS NO LONGER SEVERE.

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

LAT...LON 3169 9844 3190 9794 3168 9777 3142 9827
      3164 9844 3166 9845
TIME...MOT...LOC 0328Z 281DEG 25KT 3155 9814

$$

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 Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 4, 8:41 PM CDT, 1 hour 21 minutes earlier.

Area forecast discussion, May 4, 8:41 PM CDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
841 PM CDT FRI MAY 4 2012

.UPDATE...
HAVE ADDED PRECIP AFTER 1 AM/06Z TO FAR SOUTHEAST AND EAST
COUNTIES BASED ON EXTRAPOLATION OF CURRENT STORMS. DO NOT EXPECT
MUCH OF A SEVERE THREAT BY THEN. UPDATE ON THE WAY.   84

&&

.AVIATION...
/18Z TAFS/

VFR CONDITIONS GENERALLY PREVAIL ACROSS ALL OF NORTH TEXAS WITH
SOUTHERLY WINDS AROUND 15KTS. THERE IS A LINE OF ELEVATED
THUNDERSTORMS TO THE NORTHWEST OF THE METROPLEX EXTENDING FROM
NEAR BRECKENRIDGE UP TO BOWIE. THIS LINE IS NOT EXPECTED TO AFFECT
AREA AIRPORTS HOWEVER THERE IS A DISTURBANCE MOVING THROUGH THE
SOUTHERN PLAINS WHICH MAY HELP IGNITE MORE THUNDERSTORMS THROUGH
THE AFTERNOON. MUCH OF THIS NEW ACTIVITY IS EXPECTED TO BE ALONG
THE DRYLINE AND THERE IS SOME UNCERTAINTY AS TO HOW FAR EAST IT
WILL GET. FOR NOW...WILL MAINTAIN A VFR FORECAST AND MONITOR
CONVECTIVE TRENDS FOR POSSIBLE AMENDMENTS. OTHERWISE...MVFR CIGS
ARE EXPECTED TO DEVELOP AND MOVE NORTH OVERNIGHT BUT WILL KEEP
THEM CONFINED TO THE WACO AREA FOR THE EARLY MORNING HOURS.

DUNN

&&

.PREV UPDATE...
.UPDATE...
QUICK UPDATE TO EXTEND SEVERE WATCH ONE ROW OF COUNTIES EAST.
OTHERWISE...ONLY COSMETIC CHANGES TO FORECAST. 84

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  72  92  74  92  69 /  30  10  10  10  30
WACO, TX              74  93  72  93  70 /  20  10  10  10  30
PARIS, TX             69  90  69  89  71 /  20  10  10  10  20
DENTON, TX            71  94  74  92  69 /  30  10  10  10  30
MCKINNEY, TX          72  92  73  92  70 /  20  10  10  10  30
DALLAS, TX            72  92  74  92  70 /  20  10  10  10  30
TERRELL, TX           70  91  72  91  70 /  20  10  10  10  30
CORSICANA, TX         70  91  72  92  71 /  20  10  10  10  30
TEMPLE, TX            72  93  72  93  70 /  20  10  10  10  30
MINERAL WELLS, TX     70  96  72  94  68 /  30  10  10  20  30

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

 /

Hazardous weather outlook, May 4, 9:48 PM CDT, 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
948 PM CDT FRI MAY 4 2012

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-051130-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
948 PM CDT FRI MAY 4 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TONIGHT.
A CHANCE OF THUNDERSTORMS CONTINUES SOUTHEAST OF A GAINESVILLE...
GRANBURY...COMANCHE LINE. SOME STORMS WILL BE SEVERE...PRODUCING
LARGE HAIL AND DAMAGING WINDS AS WELL AS CLOUD TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF NORTH TEXAS
SUNDAY EVENING THROUGH TUESDAY. SOME STORMS COULD BE SEVERE SUNDAY
EVENING INTO MONDAY. THE SEVERE WEATHER THREAT WILL DIMINISH BY
TUESDAY ACROSS THE REGION.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUESTED THROUGH MIDNIGHT...SOUTHEAST OF A
GAINESVILLE...GRANBURY...COMANCHE LINE.

In the hours before

Local storm report, May 4, 9:15 PM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
915 PM CDT FRI MAY 04 2012

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0907 PM     TSTM WND GST     MIDLOTHIAN              32.48N  96.98W
05/04/2012  E60 MPH          ELLIS              TX   TRAINED SPOTTER

            60 MPH WIND GUSTS AND POWER LINES BLOWN DOWN 2 SOUTHWEST
            OF MIDLOTHIAN

Local storm report, May 4, 9:18 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
918 PM CDT FRI MAY 04 2012

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0842 PM     TSTM WND DMG     SIVELLS BEND            33.83N  97.25W
05/04/2012                   COOKE              TX   EMERGENCY MNGR

            SEVERAL TREES DOWN...SIZE UNKNOWN. DAMAGE TO TIN ROOF.

Special weather statement, May 4, 9:26 PM CDT, 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
926 PM CDT FRI MAY 4 2012

TXZ118-119-133-050300-
DALLAS TX-JOHNSON TX-TARRANT TX-
926 PM CDT FRI MAY 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN DALLAS COUNTY
  NORTHWESTERN JOHNSON COUNTY
  SOUTHERN TARRANT COUNTY

AT 923 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED AN
AREA OF STRONG AND GUSTY WINDS BEHIND AN EXITING LINE OF
THUNDERSTORMS. WIND GUSTS BEHIND THIS LINE OF STORMS MAY TEMPORARILY
REACH 50 MPH.

CITIES THAT MAY EXPERIENCE THE STRONG AND GUSTY WINDS INCLUDE
ARLINGTON...BURLESON...CEDAR HILL...CLEBURNE...CROWLEY...
DUNCANVILLE...EDGECLIFF...EVERMAN...FOREST HILL...GODLEY...
JOSHUA...KEENE...KENNEDALE...MANSFIELD...RENDON...CEDAR HILL
STATE PARK AND CLEBURNE STATE PARK.

LAT...LON 3257 9685 3256 9708 3243 9709 3240 9718
      3220 9761 3254 9761 3256 9759 3255 9756
      3259 9755 3275 9735 3275 9698
TIME...MOT...LOC 0223Z 180DEG 0KT 3285 9705

Local storm report, May 4, 9:37 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
937 PM CDT FRI MAY 04 2012

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 PM     TSTM WND GST     2 S WHITEWRIGHT         33.44N  96.38W
05/04/2012  E70 MPH          GRAYSON            TX   EMERGENCY MNGR

            70 MPH WIND REPORTED JUST SOUTH OF WHITEWRIGHT

Local storm report, May 4, 9:38 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
938 PM CDT FRI MAY 04 2012

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0937 PM     TSTM WND DMG     VALLEY VIEW             33.48N  97.17W
05/04/2012                   COOKE              TX   AMATEUR RADIO

            4 INCH TREE LIMB DOWN IN VALLEY VIEW

Local storm report, May 4, 9:56 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
956 PM CDT FRI MAY 04 2012

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0930 PM     TSTM WND DMG     4 N LITTLE ELM          33.21N  96.97W
05/04/2012                   DENTON             TX   TRAINED SPOTTER

            1 FOOT DIAMETER TREE UPROOTED 4 MILES NORTH OF
            LITTLE ELM ALONG HIGHWAY 380

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 7:09 PM CDT	Tornado Warning	FWD	Hood	22 min
May 4, 7:11 PM CDT	Severe Thunderstorm Warning	FWD	Eastland	38 min
May 4, 7:37 PM CDT	Special Weather Statement	FWD	Montague	23 min
May 4, 7:41 PM CDT	Special Weather Statement	FWD	Parker	34 min
May 4, 7:44 PM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto, Parker	19 min
May 4, 7:54 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Parker, Somervell, Tarrant	66 min
May 4, 8:00 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	60 min
May 4, 8:02 PM CDT	Severe Thunderstorm Warning	FWD	Montague	55 min
May 4, 8:25 PM CDT	Severe Thunderstorm Warning	FWD	Erath	50 min
May 4, 8:33 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, Ellis, Hill, Johnson	57 min
May 4, 8:38 PM CDT	Severe Thunderstorm Warning	FWD	Cooke	67 min
May 4, 9:02 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Mills	58 min
May 4, 9:04 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	26 min
May 4, 9:07 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Cooke, Denton, Grayson	52 min
May 4, 9:12 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, Hamilton	63 min
May 4, 9:26 PM CDT	Special Weather Statement	FWD	Johnson	34 min
May 4, 9:32 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	31 min
May 4, 9:33 PM CDT	Tornado Warning	FWD	Mills	27 min
May 4, 10:04 PM CDT	Special Weather Statement	FWD	Collin, Denton, Grayson	26 min
May 4, 10:20 PM CDT	High Wind Warning	FWD	Ellis, Johnson	40 min
May 4, 10:22 PM CDT	Special Weather Statement	FWD	Rockwall	23 min
May 4, 10:24 PM CDT	Special Weather Statement	FWD	McLennan	36 min
May 4, 10:33 PM CDT	Severe Thunderstorm Warning	FWD	Coryell, Hamilton	57 min
May 4, 11:14 PM CDT	Severe Thunderstorm Warning	FWD	Freestone, Navarro	38 min
May 4, 11:17 PM CDT	Special Weather Statement	FWD	Lamar	28 min
May 5, 12:52 AM CDT	Special Weather Statement	FWD	Bell	23 min
May 5, 12:59 AM CDT	Special Weather Statement	FWD	Henderson, Navarro	31 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.