Alert archive / Kansas / Mesoscale Discussions in 2018

Mesoscale Discussion 461

May 19, 20187 counties in Kansas; 7 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 19, 2018, 12:39 PM CDT for 7 counties in Kansas; 7 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 19, 2018, 12:39 PM CDT (17:39 UTC)
Expired: May 19, 2018, 3:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Chautauqua County, KS, Cowley County, KS, Elk County, KS, Harper County, KS, Montgomery County, KS, Sumner County, KS, Wilson County, KS, Alfalfa County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Nowata County, OK, Osage County, OK, Washington County, OK

The radar

The Wichita radar (KICT), 78 km from the middle of the area, began a volume at 17:43 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 108May 19, 2:30 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 5.7 hours before the alert went out and 195 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: 755 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 1934 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 18, 8:39 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Butler, Cowley, Ellsworth, Harper, Harvey and 16 more	5 hr
May 18, 9:08 PM CDT	Mesoscale Discussion	SPC	Barber, Cheyenne, Clark, Comanche, Decatur, Edwards and 33 more	67 min
May 18, 11:14 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Cheyenne, Clark, Comanche and 50 more	46 min
May 19, 7:50 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 10 more	115 min
May 19, 1:42 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Cloud, Dickinson, Doniphan and 17 more	3 hr
May 19, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Bourbon, Butler, Chase, Chautauqua, Cherokee and 15 more	11 hr
May 19, 4:21 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Atchison, Coffey, Douglas, Franklin, Geary and 12 more	3 hr
May 19, 6:11 PM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Chautauqua, Cherokee, Crawford, Labette and 3 more	2 hr
May 18, 9:40 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 11 more	65 min
May 19, 1:05 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 6 more	2 hr
May 19, 6:50 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	2 hr

Nearby

Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in Oklahoma, 2018 Every mesoscale discussion in 2018

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.