Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 342, NWS Fort Worth, TX

June 12, 2009Hill County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jun 12, 2009, 9:27 PM CDT for Hill County, Texas. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 12, 2009, 9:27 PM CDT (02:27 UTC)
Expired: Jun 12, 2009, 10:18 PM CDT
In force: 51 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Hill County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 67 km from the middle of the area, began a volume at 02:30 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 12, 3:29 PM CDT	Tornado 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 95 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: 3698 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1518 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 13.8

Open this sounding in Storm Lab

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 Jun 12, 9:03 PM CDT, 24 minutes earlier.

Area forecast discussion, Jun 12, 9:03 PM CDT, 24 minutes before

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Hazardous weather outlook, Jun 12, 3:45 PM CDT, 5 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE FORT WORTH TX
345 PM CDT FRI JUN 12 2009

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-131100-
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-
345 PM CDT FRI JUN 12 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.
THERE IS A CHANCE OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING ACROSS ALL OF NORTH TEXAS. THE SEVERE THUNDERSTORMS WILL
HAVE THE POTENTIAL TO PRODUCE LARGE HAIL...DAMAGING WINDS...AND
TORNADOES. IN ADDITION...HEAVY RAINFALL AND DANGEROUS CLOUD TO
GROUND LIGHTNING ARE EXPECTED WITH THE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
A CHANCE FOR THUNDERSTORMS WILL CONTINUE SATURDAY AND SUNDAY.
SEVERE WEATHER WILL BE POSSIBLE WITH ANY STORMS THAT DEVELOP.

HEAT INDEX VALUES WILL REACH THE TRIPLE DIGITS IN SOME LOCATIONS
THIS WEEKEND...THEN BECOME MORE WIDESPREAD DURING THE FORTHCOMING
WEEK. AT TIMES...HEAT INDEX VALUES MAY REACH 105 DEGREES OR MORE.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY THIS EVENING...PRIMARILY WEST OF THE
I-35 CORRIDOR. ADDITIONAL ACTIVATION MAY BE REQUESTED ELSEWHERE.

25

In the hours before

Local storm report, Jun 12, 8:24 PM CDT, 1 hour 3 minutes before

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Local storm report, Jun 12, 8:30 PM CDT, 57 minutes before

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Local storm report, Jun 12, 8:33 PM CDT, 54 minutes before

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Local storm report, Jun 12, 8:42 PM CDT, 45 minutes before

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Special weather statement, Jun 12, 9:02 PM CDT, 25 minutes before

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Local storm report, Jun 12, 9:15 PM CDT, 12 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:13 PM CDT	Tornado Warning	FWD	Parker	37 min
Jun 12, 7:23 PM CDT	Special Weather Statement	FWD	Hood	22 min
Jun 12, 7:24 PM CDT	Severe Thunderstorm Warning	FWD	Hood	66 min
Jun 12, 7:43 PM CDT	Severe Thunderstorm Warning	FWD	Parker	62 min
Jun 12, 7:49 PM CDT	Severe Thunderstorm Warning	FWD	Johnson, Somervell	71 min
Jun 12, 8:26 PM CDT	Severe Thunderstorm Warning	FWD	Hood	29 min
Jun 12, 8:56 PM CDT	Severe Thunderstorm Warning	FWD	Hill, Johnson	64 min
Jun 12, 9:02 PM CDT	Special Weather Statement	FWD	Tarrant	28 min
Jun 12, 9:12 PM CDT	Severe Thunderstorm Warning	FWD	Bosque	44 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.