Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1868

October 21, 20155 counties in Kansas; 5 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 21, 2015, 4:23 PM CDT for 5 counties in Kansas; 5 counties in Oklahoma; 9 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Oct 21, 2015, 4:23 PM CDT (21:23 UTC)
Expired: Oct 21, 2015, 5:30 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Barber County, KS, Clark County, KS, Comanche County, KS, Kiowa County, KS, Pratt County, KS, Beaver County, OK, Ellis County, OK, Harper County, OK, Woods County, OK, Woodward County, OK, Carson County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Roberts County, TX

The radar

The Dodge City radar (KDDC), 160 km from the middle of the area, began a volume at 21:24 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, 9.4 hours before the alert went out and 173 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 677 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 20, 8:21 PM CDT	Mesoscale Discussion	SPC	El Paso, Hudspeth	114 min
Oct 21, 10:50 AM CDT	Mesoscale Discussion	SPC	El Paso, Hudspeth	115 min
Oct 21, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	El Paso, Hudspeth	8 hr
Oct 21, 1:22 PM CDT	Mesoscale Discussion	SPC	Culberson, El Paso, Hudspeth	23 min
Oct 21, 3:23 PM CDT	Mesoscale Discussion	SPC	El Paso, Hudspeth	2 hr
Oct 21, 3:51 PM CDT	Mesoscale Discussion	SPC	Brewster, Culberson, Jeff Davis, Loving, Pecos, Presidio and 2 more	114 min
Oct 21, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Culberson, Ector, Gaines, Jeff Davis, Loving and 4 more	6 hr
Oct 21, 6:31 PM CDT	Mesoscale Discussion	SPC	Hudspeth	89 min

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Kansas, 2015 Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion 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.