Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 507

April 16, 20176 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2017, 3:54 PM CDT for 6 counties in Oklahoma; 4 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 16, 2017, 3:54 PM CDT (20:54 UTC)
Expired: Apr 16, 2017, 5:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Carter County, OK, Cotton County, OK, Jefferson County, OK, Love County, OK, Marshall County, OK, Stephens County, OK, Clay County, TX, Cooke County, TX, Montague County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 123 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 126 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: 1106 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 803 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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
Apr 15, 7:35 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Woods, Woodward	85 min
Apr 16, 3:02 PM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Greer, Harmon, Jackson, Roger Mills	88 min
Apr 16, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more	8 hr
Apr 16, 1:46 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Pecos	119 min
Apr 16, 6:19 PM CDT	Mesoscale Discussion	SPC	Andrews, Ector, Gaines, Terry, Winkler, Yoakum	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.