Alert archive / Missouri / Mesoscale Discussions in 2007

Mesoscale Discussion 398

March 31, 20074 counties in Illinois; 39 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 12:57 PM CDT for 4 counties in Illinois; 39 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 31, 2007, 12:57 PM CDT (17:57 UTC)
Expired
Mar 31, 2007, 3:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 43 counties

Calhoun County, IL, Greene County, IL, Jersey County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Chariton County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Shelby County, MO, Texas County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 99 km from the middle of the area, began a volume at 17:56 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

Springfield, MO (KSGF), launched 12:00Z, 6.0 hours before the alert went out and 291 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, Springfield, MO at 12:00Z on 2007-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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, Springfield, MO at 12:00Z on 2007-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 383 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
11 J/kg
Mixed-layer CIN
-137 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
383 m²/s²
0-3 km storm-relative helicity
328 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
Mar 31, 1:47 PM CDTTornado WatchSPCAdams, Brown, Hancock, Henderson, McDonough, Mercer and 4 more7 hr
Mar 31, 4:25 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, Christian, DeKalb and 39 more2 hr
Mar 31, 5:11 PM CDTTornado WatchSPCBoone, Bureau, Carroll, Cass, Champaign, Christian and 37 more6 hr
Mar 30, 7:12 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Cass, Cedar, Dade and 5 more63 min
Mar 30, 11:44 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more61 min
Mar 31, 10:30 AM CDTMesoscale DiscussionSPCAtchison, Harrison, Mercer, Nodaway, Putnam, Schuyler and 1 more90 min
Mar 31, 11:38 AM CDTTornado WatchSPCAtchison, Gentry, Grundy, Harrison, Holt, Mercer and 4 more7 hr

Nearby

Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Illinois, 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.