Alert archive / Oklahoma / Mesoscale Discussions in 2016

Mesoscale Discussion 1709

September 17, 201621 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2016, 4:46 PM CDT for 21 counties in Oklahoma. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Sep 17, 2016, 4:46 PM CDT (21:46 UTC)
Expired: Sep 17, 2016, 6:15 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 21 counties

Atoka County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Johnston County, OK, Kingfisher County, OK, Lincoln County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 43 km from the middle of the area, began a volume at 21:49 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, 9.8 hours before the alert went out and 27 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: 521 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1123 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Sep 17, 1:18 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Kiowa, Washita	87 min
Sep 17, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 14 more	6 hr
Sep 17, 2:38 PM CDT	Mesoscale Discussion	SPC	Cimarron	2 hr
Sep 17, 3:19 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron, Texas	10 hr
Sep 17, 5:33 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Texas	117 min

Nearby

Mesoscale Discussions in Oklahoma, 2016 Every mesoscale discussion in 2016

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.