Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 22

January 10, 202031 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2020, 8:49 PM CST for 31 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2020, 8:49 PM CST (02:49 UTC)
Expired: Jan 10, 2020, 10:45 PM CST
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 31 counties

Angelina County, TX, Austin County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Madison County, TX, Matagorda County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 66 km from the middle of the area, began a volume at 02:53 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.8 hours before the alert went out and 218 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: 2102 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 9.2

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
Jan 10, 6:30 PM CST	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 16 more	2 hr
Jan 10, 7:30 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bell, Bowie, Camp, Cass and 40 more	2 hr
Jan 10, 9:09 PM CST	Tornado Watch	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	5 hr
Jan 10, 10:40 PM CST	Mesoscale Discussion	SPC	Cass, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 5 more	2 hr
Jan 11, 12:21 AM CST	Mesoscale Discussion	SPC	Angelina, Brazoria, Chambers, Galveston, Hardin, Harris and 10 more	99 min
Jan 11, 12:28 AM CST	Tornado Watch	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Sabine and 1 more	8 hr
Jan 11, 1:19 AM CST	Mesoscale Discussion	SPC	Sabine	86 min
Jan 11, 7:34 AM CST	Mesoscale Discussion	SPC	Cooke, Denton, Fannin, Grayson	116 min

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.