Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 424

May 15, 201811 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 15, 2018, 11:31 AM CDT for 11 counties in Oklahoma. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 15, 2018, 11:31 AM CDT (16:31 UTC)
Expired: May 15, 2018, 1:30 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Johnston County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 70 km from the middle of the area, began a volume at 16:30 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 12:00Z, 4.5 hours before the alert went out and 58 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: 31 J/kg
Mixed-layer CIN: -367 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 223 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
May 14, 7:15 PM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Ottawa, Washington	90 min
May 14, 8:05 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 11 more	85 min
May 14, 11:30 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more	90 min
May 15, 2:32 PM CDT	Mesoscale Discussion	SPC	Cimarron	118 min
May 15, 3:17 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Johnston, Love and 5 more	88 min
May 15, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron, Texas	8 hr

Nearby

Mesoscale Discussions in Oklahoma, 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.