Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 1726

October 21, 201719 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 21, 2017, 5:41 PM CDT for 19 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Oct 21, 2017, 5:41 PM CDT (22:41 UTC)
Expired: Oct 21, 2017, 7:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Borden County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Fisher County, TX, Foard County, TX, Garza County, TX, Hardeman County, TX, Hockley County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Scurry County, TX, Stonewall County, TX, Terry County, TX

The radar

The Lubbock radar (KLBB), 63 km from the middle of the area, began a volume at 22:41 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.7 hours before the alert went out and 205 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: 17 J/kg
Mixed-layer CIN: -358 J/kg
Mixed-layer LCL: 1925 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 21, 2:36 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Wichita and 1 more	114 min
Oct 21, 3:06 PM CDT	Tornado Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	7 hr
Oct 21, 5:05 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Wichita and 1 more	85 min
Oct 21, 6:40 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cooke, Haskell, Jack and 7 more	95 min

Nearby

Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.