Alert archive / Missouri / Mesoscale Discussions in 2004

Mesoscale Discussion 2320

October 18, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2004, 4:40 AM CDT for 5 states. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: Oct 18, 2004, 4:40 AM CDT (09:40 UTC)
Expired: Oct 18, 2004, 5:15 AM CDT
In force: 35 min
Issued by: the Storm Prediction Center

All 55 counties

Clay County, AR, Greene County, AR, Randolph County, AR, Sharp County, AR, Alexander County, IL, Bond County, IL, Calhoun County, IL, Clay County, IL, Clinton County, IL, Fayette County, IL, Franklin County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Dunklin County, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Mississippi County, MO, Montgomery County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Lake County, TN, Obion County, TN

The radar

The St Louis radar (KLSX), 118 km from the middle of the area, began a volume at 09:42 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

Springfield, MO (KSGF), launched 00:00Z, 9.7 hours before the alert went out and 299 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1179 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 307 m²/s²
0-3 km storm-relative helicity: 448 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.

Issued	Product	Office	Counties	Lasted
Oct 17, 11:30 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Clay, Fulton, Greene, Marion, Randolph and 1 more	6 hr
Oct 18, 2:19 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clark, Clay and 42 more	56 min
Oct 18, 7:44 AM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more	61 min
Oct 18, 9:45 AM CDT	Tornado Watch	SPC	Arkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more	5 hr
Oct 18, 11:29 AM CDT	Mesoscale Discussion	SPC	Arkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more	91 min
Oct 18, 2:18 PM CDT	Mesoscale Discussion	SPC	Arkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more	57 min
Oct 18, 4:05 PM CDT	Tornado Watch	SPC	Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 15 more	5 hr
Oct 18, 5:21 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more	114 min
Oct 18, 5:50 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 20 more	5 hr
Oct 17, 10:01 PM CDT	Mesoscale Discussion	SPC	Monroe, Randolph	3 hr
Oct 18, 10:20 AM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Clay, Clinton, Edwards, Effingham and 27 more	85 min
Oct 18, 12:04 PM CDT	Mesoscale Discussion	SPC	Alexander, Jackson, Monroe, Pulaski, Randolph, Union	86 min
Oct 18, 12:40 PM CDT	Tornado Watch	SPC	Alexander, Clinton, Jackson, Monroe, Perry, Randolph and 2 more	5 hr
Oct 18, 1:55 PM CDT	Mesoscale Discussion	SPC	Gallatin, Hardin, Johnson, Massac, Pope, Pulaski and 2 more	95 min
Oct 18, 3:41 PM CDT	Mesoscale Discussion	SPC	Alexander, Clinton, Jackson, Monroe, Perry, Randolph and 3 more	94 min
Oct 18, 5:05 PM CDT	Tornado Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more	5 hr
Oct 18, 6:05 PM CDT	Mesoscale Discussion	SPC	Bond, Clay, Clinton, Crawford, Edwards, Effingham and 23 more	115 min
Oct 18, 3:20 PM CDT	Tornado Watch	SPC	Franklin, Giles, Lincoln	5 hr
Oct 18, 6:02 PM CDT	Mesoscale Discussion	SPC	Franklin, Giles, Lawrence, Lincoln, Moore, Wayne	88 min

Nearby

Mesoscale Discussions in Missouri, 2004 Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Arkansas, 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.