Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 311

March 22, 200722 counties in Illinois; 13 counties in Iowa; 12 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2007, 2:02 AM CDT for 22 counties in Illinois; 13 counties in Iowa; 12 counties in Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Mar 22, 2007, 2:02 AM CDT (07:02 UTC)
Expired
Mar 22, 2007, 4:00 AM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 47 counties

Cedar County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Rock Island County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Audrain County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Scotland County, MO, Shelby County, MO

The radar

The Quad Cities radar (KDVN), 156 km from the middle of the area, began a volume at 07:03 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

Davenport, (KDVN), launched 00:00Z, 7.0 hours before the alert went out and 160 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, Davenport, at 00:00Z on 2007-03-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 730 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, Davenport, at 00:00Z on 2007-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 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
730 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
1120 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.4

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.

IssuedProductOfficeCountiesLasted
Mar 22, 2:49 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 14 more26 min
Mar 22, 2:59 AM CDTTornado WatchSPCAdams, Brown, Calhoun, Cass, Christian, DeWitt and 19 more7 hr
Mar 22, 4:43 AM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Cumberland, Douglas, Edgar and 4 more62 min
Mar 22, 5:03 AM CDTSevere Thunderstorm WatchSPCChampaign, Coles, Douglas, Edgar, Ford, Iroquois and 1 more4 hr
Mar 22, 6:13 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 20 more62 min
Mar 22, 7:08 AM CDTMesoscale DiscussionSPCClark67 min
Mar 21, 9:31 PM CDTMesoscale DiscussionSPCAdair, Adams, Boone, Butler, Calhoun, Cerro Gordo and 21 more59 min
Mar 21, 10:24 PM CDTSevere Thunderstorm WatchSPCAppanoose, Clarke, Davis, Decatur, Lucas, Monroe and 4 more4 hr
Mar 22, 12:52 AM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Lucas, Monroe and 4 more53 min

Nearby

Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Missouri, 2007Every mesoscale discussion in 2007

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.