Alert archive / Missouri / Mesoscale Discussions in 2004

Mesoscale Discussion 2127

August 27, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2004, 1:49 AM CDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2004, 1:49 AM CDT (06:49 UTC)
Expired: Aug 27, 2004, 2:45 AM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 31 counties

Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Henderson County, IL, Henry County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Whiteside County, IL, Winnebago County, IL, Adair County, MO, Clark County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Jefferson County, WI, Ozaukee County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 06:52 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

Davenport, (KDVN), launched 00:00Z, 6.8 hours before the alert went out and 77 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: 3587 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 18.5

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
Aug 26, 9:13 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Rock Island, Stephenson	62 min
Aug 26, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more	6 hr
Aug 26, 11:53 PM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more	97 min
Aug 27, 1:25 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DeWitt, DuPage and 25 more	6 hr
Aug 27, 4:36 AM CDT	Mesoscale Discussion	SPC	Cook, DeWitt, Ford, Fulton, Grundy, Hancock and 11 more	84 min
Aug 27, 6:33 AM CDT	Mesoscale Discussion	SPC	Champaign, DeWitt, Ford, Iroquois, McLean, Mason and 4 more	27 min
Aug 27, 9:24 AM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey, Macoupin, Madison, Morgan and 2 more	96 min
Aug 27, 9:40 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Calhoun, Cass, Greene, Jersey, Macoupin and 7 more	5 hr
Aug 27, 1:07 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Greene, Jersey and 6 more	113 min
Aug 27, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Cass, Greene, Jersey, Morgan, Pike and 1 more	6 hr
Aug 27, 3:49 PM CDT	Mesoscale Discussion	SPC	Calhoun, Cass, Greene, Jersey, Morgan, Pike and 1 more	86 min
Aug 27, 4:10 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Fulton, Hancock, Henderson and 14 more	2 hr
Aug 26, 7:45 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 56 more	90 min
Aug 27, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Buchanan, Caldwell, Carroll, Chariton, Clay and 17 more	6 hr

Nearby

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