Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 187

March 17, 202013 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2020, 11:49 AM CDT for 13 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Mar 17, 2020, 11:49 AM CDT (16:49 UTC)
Expired: Mar 17, 2020, 1:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Motley County, TX, Stonewall County, TX

The radar

The Lubbock radar (KLBB), 114 km from the middle of the area, began a volume at 16:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 52Mar 17, 1:05 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 4.8 hours before the alert went out and 186 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: 201 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 17, 8:44 AM CDT	Severe Thunderstorm Watch	SPC	Cottle, Crosby, Dickens, Floyd, Garza, Hale and 9 more	4 hr
Mar 17, 9:12 AM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 25 more	93 min
Mar 17, 1:02 PM CDT	Severe Thunderstorm Watch	SPC	Baylor, Cottle, Dickens, Foard, Haskell, Kent and 5 more	6 hr
Mar 17, 2:55 PM CDT	Mesoscale Discussion	SPC	Andrews, Crane, Ector, Terrell, Upton, Winkler	3 hr
Mar 17, 3:01 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Fisher, Haskell, Jones, Kent and 11 more	119 min
Mar 17, 4:41 PM CDT	Severe Thunderstorm Watch	SPC	Borden, Callahan, Coke, Coleman, Concho, Crane and 31 more	7 hr

Nearby

Mesoscale Discussions in Texas, 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.