Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 744

May 27, 20209 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2020, 2:33 PM CDT for 9 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 27, 2020, 2:33 PM CDT (19:33 UTC)
Expired: May 27, 2020, 4:00 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 230

Counties Austin County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Harris County, TX, Lee County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Ft Hood radar (KGRK), 124 km from the middle of the area, began a volume at 19:35 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 232May 27, 5:20 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 7.6 hours before the alert went out and 309 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: 827 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
May 27, 12:08 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Bell, Brazos, Burleson, Burnet and 16 more	2 hr
May 27, 12:44 PM CDT	Mesoscale Discussion	SPC	Brown, Burnet, Callahan, Coleman, Comanche, Concho and 11 more	2 hr
May 27, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Bastrop, Bell, Blanco, Bosque, Brazoria and 42 more	9 hr
May 27, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coleman, Concho, Kimble, McCulloch and 5 more	7 hr
May 27, 3:40 PM CDT	Mesoscale Discussion	SPC	Brown, Burnet, Callahan, Coleman, Concho, Lampasas and 6 more	95 min
May 27, 5:05 PM CDT	Mesoscale Discussion	SPC	Bexar, Blanco, Caldwell, Comal, DeWitt, Gillespie and 13 more	115 min
May 27, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 22 more	8 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.