Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 100

February 28, 201831 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2018, 6:43 PM CST for 31 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Feb 28, 2018, 6:43 PM CST (00:43 UTC)
Expired: Feb 28, 2018, 7:45 PM CST
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 31 counties

Bosque County, TX, Brown County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, McCulloch County, TX, Mills County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 47 km from the middle of the area, began a volume at 00:45 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, 0.7 hours before the alert went out and 65 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: 493 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 478 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.7

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
Feb 28, 11:54 PM CST	Mesoscale Discussion	SPC	Bell, Burnet, Coryell, Falls, Llano, Milam and 1 more	66 min

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.