Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 180

April 1, 2015Harper County, Kansas; 5 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2015, 7:26 PM CDT for Harper County, Kansas; 5 counties in Oklahoma. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2015, 7:26 PM CDT (00:26 UTC)
Expired: Apr 1, 2015, 8:30 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Harper County, KS, Alfalfa County, OK, Dewey County, OK, Major County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 67 km from the middle of the area, began a volume at 00:28 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.4 hours before the alert went out and 296 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: 63 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 3930 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 1, 8:25 PM CDT	Mesoscale Discussion	SPC	Cloud, Jewell, Mitchell, Osborne, Republic, Smith and 1 more	95 min
Apr 1, 11:36 PM CDT	Mesoscale Discussion	SPC	Cloud, Marshall, Republic, Washington	54 min
Apr 2, 1:37 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Geary, Jackson and 9 more	113 min
Apr 2, 5:22 AM CDT	Mesoscale Discussion	SPC	Bourbon, Cherokee, Crawford, Linn, Miami	113 min
Apr 2, 4:47 PM CDT	Mesoscale Discussion	SPC	Chautauqua, Cherokee, Cowley, Crawford, Elk, Labette and 3 more	88 min
Apr 2, 3:41 PM CDT	Mesoscale Discussion	SPC	Carter, Johnston, Love, Marshall, Murray, Pontotoc	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Kansas, 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.