Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1546

October 9, 20189 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2018, 5:52 AM CDT for 9 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Oct 9, 2018, 5:52 AM CDT (10:52 UTC)
Expired: Oct 9, 2018, 6:45 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bosque County, TX, Coryell County, TX, Hamilton County, TX, Hood County, TX, Johnson County, TX, Lampasas County, TX, Mills County, TX, San Saba County, TX, Somervell County, TX

The radar

The Ft Hood radar (KGRK), 118 km from the middle of the area, began a volume at 10:53 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 10.9 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: 39 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1345 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

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
Oct 8, 8:55 PM CDT	Mesoscale Discussion	SPC	Crockett, Edwards, Irion, Pecos, Reagan, Schleicher and 3 more	95 min
Oct 9, 12:45 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 15 more	6 hr
Oct 9, 3:40 AM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Edwards, Kimble, Kinney and 7 more	35 min
Oct 9, 9:09 AM CDT	Mesoscale Discussion	SPC	Delta, Fannin, Hopkins, Hunt, Lamar, Red River	2 hr
Oct 9, 10:19 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more	116 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.