Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 225

February 28, 200711 counties in Illinois; 9 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2007, 11:48 PM CST for 11 counties in Illinois; 9 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Feb 28, 2007, 11:48 PM CST (05:48 UTC)
Expired
Mar 1, 2007, 12:45 AM CST
In force
57 min
Issued by
the Storm Prediction Center

Counties Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 90 km from the middle of the area, began a volume at 05:48 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

Lincoln, IL (KILX), launched 00:00Z, 5.8 hours before the alert went out and 219 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, Lincoln, IL at 00:00Z on 2007-03-01Temperature 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, Lincoln, IL at 00:00Z on 2007-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 600 square meters per square second.19395878Sfc1 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
1214 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
600 m²/s²
0-3 km storm-relative helicity
665 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.

IssuedProductOfficeCountiesLasted
Feb 28, 10:30 PM CSTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 5 more90 min
Mar 1, 12:12 AM CSTMesoscale DiscussionSPCAlexander, Jackson, Johnson, Massac, Pope, Pulaski and 2 more2 hr
Mar 1, 12:16 AM CSTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more6 hr
Mar 1, 1:05 AM CSTSevere Thunderstorm WatchSPCGallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more7 hr
Mar 1, 2:28 AM CSTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more92 min
Mar 1, 3:35 AM CSTMesoscale DiscussionSPCClinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 1 more55 min
Mar 1, 3:58 AM CSTTornado WatchSPCAlexander, Bond, Clinton, Fayette, Franklin, Jackson and 10 more8 hr
Mar 1, 4:18 AM CSTMesoscale DiscussionSPCGallatin, Hardin, Johnson, Massac, Pope, Saline117 min
Mar 1, 8:40 AM CSTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 27 more9 hr
Mar 1, 10:24 AM CSTMesoscale DiscussionSPCBrown, Bureau, Cass, Cook, DeKalb, DeWitt and 28 more96 min
Mar 1, 11:25 AM CSTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more6 hr
Mar 1, 12:48 PM CSTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 28 more117 min
Mar 1, 1:47 PM CSTMesoscale DiscussionSPCCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more88 min
Feb 28, 6:11 PM CSTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Clay, Clinton, Daviess and 10 more94 min
Feb 28, 6:37 PM CSTSevere Thunderstorm WatchSPCAdair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 16 more7 hr
Feb 28, 6:50 PM CSTMesoscale DiscussionSPCBarton, Bates, Cass, Cedar, Dade, Henry and 7 more85 min
Feb 28, 7:10 PM CSTTornado WatchSPCBates, Benton, Cass, Cedar, Cooper, Henry and 6 more7 hr
Feb 28, 9:48 PM CSTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Camden, Cass and 17 more87 min
Mar 1, 1:32 AM CSTTornado WatchSPCBarry, Barton, Bates, Benton, Camden, Cedar and 18 more6 hr

Nearby

Mesoscale Discussions in Illinois, 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.