Alert archive / Missouri / Mesoscale Discussions in 2014

Mesoscale Discussion 122

February 20, 20149 counties in Illinois; 31 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2014, 11:34 AM CST for 9 counties in Illinois; 31 counties in Missouri. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Feb 20, 2014, 11:34 AM CST (17:34 UTC)
Expired
Feb 20, 2014, 1:30 PM CST
In force
116 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 40 counties

Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Morgan County, IL, Pike County, IL, Scott 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, Dallas County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Laclede County, MO, Lincoln County, MO, Maries 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 Louis County, MO, Saline County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 17:35 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 12:00Z, 5.6 hours before the alert went out and 279 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 12:00Z on 2014-02-20Temperature 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 12:00Z on 2014-02-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 582 square meters per square second.1939587897Sfc1 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
507 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
582 m²/s²
0-3 km storm-relative helicity
576 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 20, 1:36 PM CSTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Christian, Clinton and 15 more4 hr
Feb 20, 1:45 PM CSTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 5 more2 hr
Feb 20, 2:23 PM CSTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more7 hr
Feb 20, 3:23 PM CSTMesoscale DiscussionSPCBond, Calhoun, Christian, Clark, Clay, Clinton and 25 more97 min
Feb 20, 3:50 PM CSTSevere Thunderstorm WatchSPCClark, Clay, Coles, Crawford, Cumberland, DeWitt and 11 more56 min
Feb 20, 4:45 PM CSTTornado WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 12 more3 hr
Feb 20, 5:29 PM CSTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more46 min
Feb 20, 2:43 AM CSTMesoscale DiscussionSPCBenton, Camden, Cedar, Cole, Crawford, Dade and 29 more3 hr
Feb 20, 4:24 AM CSTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 11 more2 hr
Feb 20, 10:20 AM CSTMesoscale DiscussionSPCAdair, Clark, Daviess, Gentry, Grundy, Harrison and 7 more85 min

Nearby

Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Illinois, 2014Every mesoscale discussion in 2014

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.