Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 172, NWS Fort Worth, TX

July 30, 2018Cooke County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jul 30, 2018, 6:31 AM CDT for Cooke County, Texas. It was in force for 41 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
Jul 30, 2018, 6:31 AM CDT (11:31 UTC)
Expired
Jul 30, 2018, 7:12 AM CDT
In force
41 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Cooke County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 119 km from the middle of the area, began a volume at 11:33 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.

IssuedProductOfficeLasted
Jul 30, 3:49 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 11.5 hours before the alert went out and 177 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2018-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1506 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2018-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1506 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1518 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.3
Supercell composite
4.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 5:28 AM CDTSpecial Weather StatementFWDCooke, Montague62 min
Jul 30, 5:54 AM CDTSpecial Weather StatementFWDStephens, Young51 min
Jul 30, 6:05 AM CDTSpecial Weather StatementFWDCollin, Denton, Grayson, Jack, Palo Pinto, Parker and 1 more55 min
Jul 30, 6:43 AM CDTSpecial Weather StatementFWDTarrant62 min
Jul 30, 6:49 AM CDTSpecial Weather StatementFWDComanche, Eastland, Erath, Hood, Somervell71 min
Jul 30, 6:58 AM CDTSpecial Weather StatementFWDPalo Pinto, Parker, Stephens32 min
Jul 30, 7:08 AM CDTSpecial Weather StatementFWDCollin, Dallas, Delta, Fannin, Hunt, Kaufman and 2 more37 min
Jul 30, 7:32 AM CDTSpecial Weather StatementFWDBosque, Ellis, Hamilton, Hill, Johnson73 min
Jul 30, 7:51 AM CDTSpecial Weather StatementFWDCollin, Dallas, Delta, Fannin, Hopkins, Hunt and 5 more54 min
Jul 30, 9:15 AM CDTSpecial Weather StatementFWDAnderson, Bell, Coryell, Falls, Freestone, Henderson and 3 more30 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018Every severe thunderstorm warning in 2018

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.