Alert archive / Kansas / Mesoscale Discussions in 2013

Mesoscale Discussion 830

May 27, 201316 counties in Kansas; 12 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 27, 2013, 8:18 PM CDT for 16 counties in Kansas; 12 counties in Nebraska. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 27, 2013, 8:18 PM CDT (01:18 UTC)
Expired: May 27, 2013, 10:15 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 28 counties

Clay County, KS, Cloud County, KS, Dickinson County, KS, Ellsworth County, KS, Geary County, KS, Jewell County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Wabaunsee County, KS, Washington County, KS, Clay County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nuckolls County, NE, Pawnee County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, York County, NE

The radar

The Topeka radar (KTWX), 115 km from the middle of the area, began a volume at 01:21 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 232May 27, 9:30 PM CDT

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 1.3 hours before the alert went out and 158 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: 2862 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.2

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 27, 9:07 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Cloud, Dickinson, Doniphan and 21 more	53 min
May 27, 9:31 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Johnson and 3 more	7 hr
May 27, 10:23 PM CDT	Mesoscale Discussion	SPC	Brown, Marshall, Nemaha, Pottawatomie, Riley, Washington	67 min
May 27, 11:19 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Leavenworth and 3 more	116 min
May 28, 1:37 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Bourbon, Brown, Chase and 32 more	113 min
May 28, 2:23 PM CDT	Tornado Watch	SPC	Atchison, Barton, Brown, Clay, Cloud, Coffey and 29 more	8 hr
May 28, 2:28 PM CDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Kiowa, Pratt	62 min
May 28, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Clark, Comanche, Edwards, Ford, Kiowa and 5 more	9 hr
May 28, 3:08 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Greeley, Logan, Rawlins, Sheridan, Sherman and 2 more	2 hr
May 28, 3:51 PM CDT	Severe Thunderstorm Watch	SPC	Cheyenne	9 hr
May 28, 5:52 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Dickinson, Doniphan, Geary and 11 more	83 min
May 28, 6:05 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Sherman	115 min
May 27, 8:39 PM CDT	Mesoscale Discussion	SPC	Blaine, Brown, Custer, Dawson, Frontier, Lincoln and 3 more	96 min

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.