Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 99, NWS Fort Worth, TX

May 6, 2015Stephens County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 6, 2015, 5:22 PM 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: May 6, 2015, 5:22 PM CDT (22:22 UTC)
Expired: May 6, 2015, 5:59 PM CDT
In force: 37 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

County Stephens County, TX

The radar

The Dyess AFB radar (KDYX), 45 km from the middle of the area, began a volume at 22:23 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
May 6, 1:23 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.4 hours before the alert went out and 306 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: 1226 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 308 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 9.1

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 May 6, 2:48 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, May 6, 2:48 PM CDT, 2 hours 34 minutes before

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Hazardous weather outlook, May 6, 2:58 PM CDT, 2 hours 24 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
May 6, 2:51 AM CDT	Areal Flood Advisory	FWD	Milam	114 min
May 6, 5:39 AM CDT	Areal Flood Advisory	FWD	Milam	2 hr
May 6, 5:58 PM CDT	Severe Thunderstorm Warning	FWD	Young	43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.