Alert archive / Kansas / Mesoscale Discussions in 2013

Mesoscale Discussion 686

May 18, 201320 counties in Kansas; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 10:00 PM CDT for 20 counties in Kansas; 5 counties in Missouri. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
May 18, 2013, 10:00 PM CDT (03:00 UTC)
Expired
May 18, 2013, 10:30 PM CDT
In force
30 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 25 counties

Anderson County, KS, Atchison County, KS, Brown County, KS, Coffey County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Lyon County, KS, Miami County, KS, Nemaha County, KS, Osage County, KS, Shawnee County, KS, Wabaunsee County, KS, Woodson County, KS, Wyandotte County, KS, Buchanan County, MO, Cass County, MO, Clay County, MO, Jackson County, MO, Platte County, MO

The radar

The Topeka radar (KTWX), 82 km from the middle of the area, began a volume at 03:02 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 3.0 hours before the alert went out and 35 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-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2013-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4000 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2013-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
May 18, 7:29 PM CDTTornado WatchSPCClay, Cloud, Dickinson, Geary, Jewell, Marshall and 7 more5 hr
May 18, 7:40 PM CDTMesoscale DiscussionSPCBarber, Barton, Comanche, Dickinson, Edwards, Ellsworth and 15 more65 min
May 18, 10:39 PM CDTTornado WatchSPCAnderson, Atchison, Brown, Coffey, Doniphan, Douglas and 11 more3 hr
May 18, 11:40 PM CDTMesoscale DiscussionSPCClay, Geary, Marshall, Morris, Pottawatomie, Riley and 1 more35 min
May 19, 5:25 AM CDTMesoscale DiscussionSPCAllen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 2 more2 hr
May 19, 12:51 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Brown, Butler, Chase and 41 more114 min
May 19, 1:47 PM CDTTornado WatchSPCAllen, Anderson, Atchison, Barber, Brown, Butler and 53 more10 hr
May 19, 4:57 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Butler, Chase, Chautauqua and 22 more63 min
May 19, 5:54 PM CDTMesoscale DiscussionSPCCherokee, Crawford66 min
May 19, 6:25 PM CDTTornado WatchSPCBourbon, Cherokee, Crawford9 hr
May 19, 6:27 PM CDTMesoscale DiscussionSPCChautauqua, Cowley, Elk63 min
May 19, 1:48 AM CDTMesoscale DiscussionSPCDaviess, DeKalb, Gentry, Harrison, Nodaway, Worth87 min
May 19, 11:30 AM CDTMesoscale DiscussionSPCAdair, Clark, Knox, Lewis, Putnam, Schuyler and 1 more90 min
May 19, 2:59 PM CDTTornado WatchSPCClark, Scotland8 hr

Nearby

Mesoscale Discussions in Kansas, 2013Mesoscale Discussions in Missouri, 2013Every 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.