Alert archive / Missouri / Mesoscale Discussions in 2014

Mesoscale Discussion 556

May 10, 20146 counties in Illinois; 18 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 10, 2014, 10:22 PM CDT for 6 counties in Illinois; 18 counties in Missouri. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 10, 2014, 10:22 PM CDT (03:22 UTC)
Expired
May 10, 2014, 11:45 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 24 counties

Calhoun County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Audrain County, MO, Callaway County, MO, City of Saint Louis, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 24 km from the middle of the area, began a volume at 03:23 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

Lincoln, IL (KILX), launched 00:00Z, 3.4 hours before the alert went out and 263 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 2014-05-11Temperature 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 2014-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
3064 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
146 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
May 10, 7:55 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Madison, Monroe and 2 more95 min
May 11, 9:16 AM CDTMesoscale DiscussionSPCMercer, Rock Island89 min
May 11, 10:47 AM CDTMesoscale DiscussionSPCHancock118 min
May 11, 11:53 AM CDTTornado WatchSPCCarroll, Henderson, Henry, Mercer, Rock Island, Warren and 1 more7 hr
May 11, 12:51 PM CDTMesoscale DiscussionSPCCarroll, Henderson, Jo Daviess, Mercer, Rock Island, Whiteside54 min
May 11, 2:36 PM CDTMesoscale DiscussionSPCMercer84 min
May 11, 3:05 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more7 hr
May 11, 5:09 PM CDTMesoscale DiscussionSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more66 min
May 11, 5:49 PM CDTMesoscale DiscussionSPCClark, Coles, Edgar56 min
May 10, 7:59 PM CDTMesoscale DiscussionSPCAndrew, Bates, Buchanan, Caldwell, Carroll, Cass and 19 more91 min
May 11, 1:19 AM CDTMesoscale DiscussionSPCAtchison, Nodaway2 hr
May 11, 7:02 AM CDTMesoscale DiscussionSPCAtchison, Holt118 min
May 11, 12:49 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 2 more116 min
May 11, 2:21 PM CDTTornado WatchSPCAtchison8 hr

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.