Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 128, NWS Fort Worth, TX

April 30, 2007Stephens County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 30, 2007, 1:29 AM CDT for Stephens County, Texas. It was in force for 37 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: Apr 30, 2007, 1:29 AM CDT (06:29 UTC)
Expired: Apr 30, 2007, 2:06 AM CDT
In force: 37 min
Issued by: NWS Fort Worth, TX
Area: Counties, with a storm outline in the text

County Stephens County, TX

The radar

The Dyess AFB radar (KDYX), 45 km from the middle of the area, began a volume at 06:29 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 6.5 hours before the alert went out and 145 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: 268 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 30, 12:53 AM CDT, 36 minutes earlier.

Area forecast discussion, Apr 30, 12:53 AM CDT, 36 minutes before

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Hazardous weather outlook, Apr 29, 3:20 PM CDT, 10 hours 9 minutes before

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In the hours before

Special weather statement, Apr 29, 8:00 PM CDT, 5 hours 29 minutes before

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Special weather statement, Apr 30, 12:46 AM CDT, 43 minutes before

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Special weather statement, Apr 30, 1:08 AM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
108 AM CDT MON APR 30 2007

TXZ100-115-300645-
YOUNG TX-STEPHENS TX-
108 AM CDT MON APR 30 2007

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTH CENTRAL STEPHENS COUNTY
  SOUTHWESTERN YOUNG COUNTY

AT 108 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 9 MILES NORTH OF BRECKENRIDGE...MOVING NORTH AT
20 MPH.

FREQUENT CLOUD TO GROUND LIGHTNING...VERY HEAVY RAINFALL...PEA-SIZED
HAIL...AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THIS STORM.

IF THIS STORM INTENSIFIES...A SEVERE THUNDERSTORM WARNING MAY BE NEEDED
FOR PARTS OF YOUNG COUNTY.

LAT...LON 3281 9900 3279 9878 3319 9863 3324 9893

92

Special weather statement, Apr 30, 1:15 AM CDT, 14 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
Apr 29, 8:00 PM CDT	Special Weather Statement	FWD	Young	30 min
Apr 30, 12:46 AM CDT	Special Weather Statement	FWD	Eastland	29 min
Apr 30, 1:08 AM CDT	Special Weather Statement	FWD	Young	37 min
Apr 30, 1:15 AM CDT	Special Weather Statement	FWD	Eastland, Stephens	30 min
Apr 30, 3:50 AM CDT	Flash Flood Watch	FWD	Anderson, Bell, Bosque, Collin, Cooke, Coryell and 31 more	36 hr
Apr 30, 11:57 AM CDT	Special Weather Statement	FWD	Milam	33 min
Apr 30, 12:57 PM CDT	Special Weather Statement	FWD	Robertson	33 min
Apr 30, 3:11 PM CDT	Special Weather Statement	FWD	Anderson	34 min
Apr 30, 3:30 PM CDT	Special Weather Statement	FWD	Leon	30 min
Apr 30, 3:49 PM CDT	Special Weather Statement	FWD	Anderson	56 min
Apr 30, 6:43 PM CDT	Special Weather Statement	FWD	Lamar	62 min
Apr 30, 6:45 PM CDT	Special Weather Statement	FWD	Fannin	60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007 Every severe thunderstorm warning in 2007

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.