Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 548

April 22, 20135 counties in Kansas; 9 counties in Oklahoma; Hemphill County, Lipscomb County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2013, 4:50 PM CDT for 5 counties in Kansas; 9 counties in Oklahoma; Hemphill County, Lipscomb County, Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2013, 4:50 PM CDT (21:50 UTC)
Expired: Apr 22, 2013, 5:45 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Barber County, KS, Comanche County, KS, Harper County, KS, Kingman County, KS, Pratt County, KS, Alfalfa County, OK, Dewey County, OK, Ellis County, OK, Grant County, OK, Harper County, OK, Major County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Lipscomb County, TX

The radar

The Vance AFB radar (KVNX), 95 km from the middle of the area, began a volume at 21:53 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 136Apr 22, 5:25 PM CDT

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 9.8 hours before the alert went out and 137 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1086 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 136 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 22, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Butler, Comanche, Cowley, Harper, Kingman and 3 more	8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2013 Mesoscale Discussions in Kansas, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.