Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 196

March 18, 20207 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2020, 6:48 PM CDT for 7 counties in Oklahoma; 12 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Mar 18, 2020, 6:48 PM CDT (23:48 UTC)
Expired: Mar 18, 2020, 8:45 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center

Counties Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Childress County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Lubbock County, TX, Motley County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 105 km from the middle of the area, began a volume at 23:48 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, 11.8 hours before the alert went out and 181 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: 2093 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 122 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
Mar 18, 2:49 PM CDT	Mesoscale Discussion	SPC	Jefferson	116 min
Mar 18, 4:42 PM CDT	Tornado Watch	SPC	Beckham, Caddo, Carter, Comanche, Cotton, Greer and 8 more	7 hr
Mar 17, 7:48 PM CDT	Mesoscale Discussion	SPC	Coke, Concho, Crockett, Fisher, Haskell, Irion and 10 more	117 min
Mar 17, 11:11 PM CDT	Mesoscale Discussion	SPC	Archer, Brown, Callahan, Coke, Coleman, Comanche and 22 more	34 min
Mar 18, 2:07 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Comanche, Dallas, Eastland, Ellis and 13 more	113 min
Mar 18, 5:37 PM CDT	Mesoscale Discussion	SPC	Jones, Shackelford, Stephens, Throckmorton, Young	113 min

Nearby

Mesoscale Discussions in Texas, 2020 Mesoscale Discussions in Oklahoma, 2020 Every mesoscale discussion in 2020

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.