Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 327

April 16, 2015Roger Mills County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2015, 8:56 PM CDT for Roger Mills County, Oklahoma. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 16, 2015, 8:56 PM CDT (01:56 UTC)
Expired: Apr 16, 2015, 10:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

County Roger Mills County, OK

The radar

The Altus AFB radar (KFDR), 151 km from the middle of the area, began a volume at 01:58 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 66Apr 17, 12:00 AM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.9 hours before the alert went out and 159 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: 301 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 7:08 PM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Roger Mills	2 hr
Apr 16, 7:16 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Comanche, Cotton, Custer and 10 more	89 min
Apr 16, 7:44 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	61 min
Apr 16, 9:17 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Custer, Dewey, Garfield and 5 more	88 min
Apr 16, 10:20 PM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Harmon, Roger Mills	2 hr
Apr 16, 11:59 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Custer, Dewey, Ellis, Greer and 4 more	5 hr
Apr 17, 2:02 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Custer, Dewey, Ellis, Greer and 6 more	88 min
Apr 17, 4:43 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 8 more	62 min
Apr 17, 3:06 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 12 more	84 min

Nearby

Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion in 2015

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.