Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1674

November 30, 201814 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2018, 10:32 PM CST for 14 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Nov 30, 2018, 10:32 PM CST (04:32 UTC)
Expired: Dec 1, 2018, 12:00 AM CST
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bell County, TX, Burnet County, TX, Ellis County, TX, Falls County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Robertson County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 101 km from the middle of the area, began a volume at 04:35 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 4.5 hours before the alert went out and 156 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: 1237 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 360 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 10.9

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
Nov 30, 6:17 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Gregg, Harrison, Marion and 6 more	58 min
Nov 30, 6:35 PM CST	Mesoscale Discussion	SPC	Archer, Bosque, Clay, Collin, Comanche, Cooke and 28 more	85 min
Nov 30, 6:40 PM CST	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 9 more	7 hr
Nov 30, 9:02 PM CST	Mesoscale Discussion	SPC	Bowie, Cass, Morris, Titus	58 min
Nov 30, 9:52 PM CST	Mesoscale Discussion	SPC	Collin, Dallas, Delta, Fannin, Hopkins, Hunt and 6 more	83 min
Nov 30, 11:20 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Franklin, Gregg and 12 more	85 min
Dec 1, 12:58 AM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Gregg, Harrison, Marion and 4 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.