Alert archive / Kansas / Mesoscale Discussions in 2004

Mesoscale Discussion 735

May 18, 200410 counties in Kansas; 9 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 6:22 AM CDT for 10 counties in Kansas; 9 counties in Missouri. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 18, 2004, 6:22 AM CDT (11:22 UTC)
Expired: May 18, 2004, 8:15 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Coffey County, KS, Douglas County, KS, Franklin County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Miami County, KS, Osage County, KS, Shawnee County, KS, Wyandotte County, KS, Buchanan County, MO, Caldwell County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, DeKalb County, MO, Jackson County, MO, Platte County, MO, Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 83 km from the middle of the area, began a volume at 11:25 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, 11.4 hours before the alert went out and 42 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: 555 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1487 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

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 17, 7:59 PM CDT	Mesoscale Discussion	SPC	Barton, Butler, Clark, Clay, Dickinson, Edwards and 40 more	2 hr
May 17, 8:20 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Nemaha	55 min
May 18, 2:22 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Douglas, Ellsworth, Geary, Jackson and 10 more	113 min
May 18, 4:28 PM CDT	Mesoscale Discussion	SPC	Allen, Barber, Butler, Elk, Greenwood, Harvey and 6 more	2 hr
May 18, 6:27 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Chase, Coffey, Douglas, Franklin and 11 more	2 hr
May 18, 10:26 AM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Lincoln, Monroe, Montgomery and 6 more	3 hr
May 18, 12:00 PM CDT	Severe Thunderstorm Watch	SPC	Crawford, Franklin, Gasconade, Jefferson, Lincoln, Marion and 7 more	7 hr
May 18, 2:38 PM CDT	Mesoscale Discussion	SPC	Jefferson, Saint Louis, City of Saint Louis	2 hr

Nearby

Mesoscale Discussions in Kansas, 2004 Mesoscale Discussions in Missouri, 2004 Every mesoscale discussion in 2004

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.