Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 139

March 19, 201810 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2018, 1:08 AM CDT for 10 counties in Oklahoma; 8 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 19, 2018, 1:08 AM CDT (06:08 UTC)
Expired: Mar 19, 2018, 3:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Hughes County, OK, Johnston County, OK, Marshall County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Lamar County, TX

The radar

The Norman radar (KTLX), 154 km from the middle of the area, began a volume at 06:09 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

Norman, OK (KOUN), launched 00:00Z, 6.1 hours before the alert went out and 152 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: 4 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 423 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Mar 19, 2:14 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Craig, Grant, Kay, Nowata, Osage and 1 more	2 hr
Mar 19, 4:26 AM CDT	Mesoscale Discussion	SPC	Adair, Delaware, LeFlore, Ottawa	2 hr
Mar 18, 7:55 PM CDT	Mesoscale Discussion	SPC	Angelina, Grimes, Hardin, Jasper, Montgomery, Nacogdoches and 7 more	95 min
Mar 18, 9:11 PM CDT	Severe Thunderstorm Watch	SPC	Hardin, Jasper, Newton, Sabine, San Augustine, Shelby and 1 more	3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018 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.