Alert archive / Kansas / Mesoscale Discussions in 2013

Mesoscale Discussion 690

May 18, 20137 counties in Kansas; 5 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 11:40 PM CDT for 7 counties in Kansas; 5 counties in Nebraska. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: May 18, 2013, 11:40 PM CDT (04:40 UTC)
Expired: May 19, 2013, 12:15 AM CDT
In force: 35 min
Issued by: the Storm Prediction Center

Counties Clay County, KS, Geary County, KS, Marshall County, KS, Morris County, KS, Pottawatomie County, KS, Riley County, KS, Washington County, KS, Butler County, NE, Gage County, NE, Jefferson County, NE, Saline County, NE, Seward County, NE

The radar

The Topeka radar (KTWX), 89 km from the middle of the area, began a volume at 04:40 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

Topeka, KS (KTOP), launched 00:00Z, 4.7 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: 4000 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 125 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
May 18, 7:29 PM CDT	Tornado Watch	SPC	Clay, Cloud, Dickinson, Geary, Jewell, Marshall and 7 more	5 hr
May 18, 7:40 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Comanche, Dickinson, Edwards, Ellsworth and 15 more	65 min
May 18, 10:00 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Coffey, Doniphan, Douglas and 14 more	30 min
May 18, 10:39 PM CDT	Tornado Watch	SPC	Anderson, Atchison, Brown, Coffey, Doniphan, Douglas and 11 more	3 hr
May 19, 5:25 AM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 2 more	2 hr
May 19, 12:51 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Brown, Butler, Chase and 41 more	114 min
May 19, 1:47 PM CDT	Tornado Watch	SPC	Allen, Anderson, Atchison, Barber, Brown, Butler and 53 more	10 hr
May 19, 4:57 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Butler, Chase, Chautauqua and 22 more	63 min
May 19, 5:54 PM CDT	Mesoscale Discussion	SPC	Cherokee, Crawford	66 min
May 19, 6:25 PM CDT	Tornado Watch	SPC	Bourbon, Cherokee, Crawford	9 hr
May 19, 6:27 PM CDT	Mesoscale Discussion	SPC	Chautauqua, Cowley, Elk	63 min
May 18, 8:33 PM CDT	Mesoscale Discussion	SPC	Burt, Cass, Cedar, Colfax, Cuming, Dakota and 13 more	117 min
May 18, 9:26 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Burt, Cass, Cedar, Colfax, Cuming and 19 more	5 hr
May 19, 4:34 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Buffalo, Clay, Franklin, Garfield and 14 more	56 min
May 19, 4:50 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Burt and 33 more	5 hr

Nearby

Mesoscale Discussions in Kansas, 2013 Mesoscale Discussions in Nebraska, 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.