Alert archive / Kansas / Mesoscale Discussions in 2017

Mesoscale Discussion 768

May 18, 201729 counties in Kansas; 10 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 18, 2017, 7:06 PM CDT for 29 counties in Kansas; 10 counties in Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
May 18, 2017, 7:06 PM CDT (00:06 UTC)
Expired
May 18, 2017, 8:30 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 39 counties

Atchison County, KS, Brown County, KS, Chase County, KS, Clay County, KS, Coffey County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, McPherson County, KS, Miami County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Riley County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Buchanan County, MO, Caldwell County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Platte County, MO, Ray County, MO

The radar

The Topeka radar (KTWX), 20 km from the middle of the area, began a volume at 00:09 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

Omaha, NE (KOAX), launched 00:00Z, 0.1 hours before the alert went out and 279 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, Omaha, NE at 00:00Z on 2017-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 00:00Z on 2017-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1013 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
211 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.

IssuedProductOfficeCountiesLasted
May 18, 9:41 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Johnson, Linn, Miami94 min
May 18, 9:41 PM CDTSevere Thunderstorm WatchSPCAtchison, Doniphan, Johnson, Leavenworth, Linn, Miami and 1 more4 hr
May 19, 3:28 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Cowley, Elk, Greenwood and 4 more92 min
May 19, 4:47 PM CDTTornado WatchSPCButler, Chase, Chautauqua, Cowley, Elk, Greenwood and 9 more4 hr
May 19, 6:45 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Cowley, Elk, Greenwood and 10 more60 min
May 18, 10:58 PM CDTTornado WatchSPCBarry, Christian, Douglas, Greene, Howell, Lawrence and 10 more6 hr
May 18, 11:48 PM CDTMesoscale DiscussionSPCBarry, Christian, McDonald, Newton, Stone, Taney57 min
May 19, 4:07 AM CDTMesoscale DiscussionSPCCallaway, Crawford, Franklin, Gasconade, Jefferson, Lincoln and 9 more113 min
May 19, 4:16 AM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 9 more3 hr
May 19, 2:13 PM CDTMesoscale DiscussionSPCBarry, Christian, Dade, Douglas, Greene, Howell and 9 more92 min
May 19, 3:06 PM CDTTornado WatchSPCAudrain, Barry, Benton, Boone, Callaway, Camden and 41 more7 hr
May 19, 5:03 PM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Pemiscot, Stoddard117 min
May 19, 6:04 PM CDTMesoscale DiscussionSPCAudrain, Barry, Benton, Boone, Callaway, Camden and 47 more86 min

Nearby

Mesoscale Discussions in Kansas, 2017Mesoscale Discussions in Missouri, 2017Every mesoscale discussion in 2017

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.