Alert archive / Kansas / Mesoscale Discussions in 2015

Mesoscale Discussion 1473

July 18, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2015, 8:30 PM CDT for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jul 18, 2015, 8:30 PM CDT (01:30 UTC)
Expired
Jul 18, 2015, 9:30 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 39 counties

Fremont County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 115 km from the middle of the area, began a volume at 01:33 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 (KFOE), launched 00:00Z, 1.5 hours before the alert went out and 90 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 2015-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3374 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 2015-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
3374 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1638 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.7
Supercell composite
16.8

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
Jul 18, 7:41 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 3 more6 hr
Jul 18, 10:54 PM CDTMesoscale DiscussionSPCDecatur, Gove, Logan, Rawlins, Sheridan, Sherman and 2 more96 min
Jul 19, 1:03 AM CDTMesoscale DiscussionSPCDecatur, Ellis, Gove, Graham, Lane, Ness and 7 more57 min
Jul 19, 2:57 AM CDTSevere Thunderstorm WatchSPCBarton, Clay, Cloud, Dickinson, Ellis, Ellsworth and 20 more5 hr
Jul 19, 5:05 AM CDTMesoscale DiscussionSPCClay, Cloud, Geary, Jewell, Marshall, Ottawa and 4 more85 min
Jul 19, 2:18 PM CDTMesoscale DiscussionSPCCheyenne, Greeley, Hamilton, Kearny, Logan, Rawlins and 6 more117 min
Jul 19, 3:37 PM CDTSevere Thunderstorm WatchSPCCheyenne, Clark, Comanche, Edwards, Finney, Ford and 24 more8 hr
Jul 18, 10:29 PM CDTMesoscale DiscussionSPCAdair, Audrain, Caldwell, Carroll, Chariton, Clay and 18 more91 min
Jul 18, 11:19 PM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Chariton, Daviess, DeKalb, Gentry and 24 more8 hr
Jul 19, 1:46 AM CDTMesoscale DiscussionSPCAudrain, Caldwell, Carroll, Chariton, Daviess, Lincoln and 12 more89 min
Jul 19, 4:45 AM CDTMesoscale DiscussionSPCFranklin, Lincoln, Montgomery, Pike, Saint Charles, Saint Louis and 2 more90 min
Jul 19, 5:40 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Brown, Cherry, Garfield, Holt and 5 more95 min
Jul 19, 5:43 PM CDTMesoscale DiscussionSPCArthur, Chase, Custer, Dawson, Deuel, Frontier and 10 more2 hr

Nearby

Mesoscale Discussions in Kansas, 2015Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Iowa, 2015Every mesoscale discussion in 2015

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.