Alert archive / Missouri / Mesoscale Discussions in 2014

Mesoscale Discussion 264

April 3, 2014Adams County, Pike County, Illinois; 16 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2014, 3:17 PM CDT for Adams County, Pike County, Illinois; 16 counties in Missouri. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2014, 3:17 PM CDT (20:17 UTC)
Expired
Apr 3, 2014, 4:15 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Adams County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Carroll County, MO, Chariton County, MO, Cooper County, MO, Howard 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, Saline County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 159 km from the middle of the area, began a volume at 20:17 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

Davenport, (KDVN), launched 12:00Z, 8.3 hours before the alert went out and 280 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 12:00Z on 2014-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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 12:00Z on 2014-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 226 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
393 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
226 m²/s²
0-3 km storm-relative helicity
197 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
Apr 3, 1:05 AM CDTMesoscale DiscussionSPCAdams, Hancock, Henderson, McDonough, Mercer, Rock Island and 2 more55 min
Apr 3, 2:49 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 44 more116 min
Apr 3, 6:24 AM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Effingham, Fayette, Franklin and 12 more96 min
Apr 3, 9:22 AM CDTMesoscale DiscussionSPCHardin, Massac, Pope83 min
Apr 3, 12:28 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more62 min
Apr 3, 12:46 PM CDTTornado WatchSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more4 hr
Apr 3, 4:58 PM CDTTornado WatchSPCMonroe, Randolph, Saint Clair7 hr
Apr 2, 9:36 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cass, Cedar and 18 more54 min
Apr 2, 9:59 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 21 more7 hr
Apr 3, 12:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Carroll, Cass and 22 more90 min
Apr 3, 9:18 AM CDTMesoscale DiscussionSPCBarry, Camden, Cedar, Christian, Dade, Dallas and 18 more57 min
Apr 3, 9:33 AM CDTTornado WatchSPCBarry, Camden, Christian, Dallas, Dent, Douglas and 19 more7 hr
Apr 3, 12:05 PM CDTMesoscale DiscussionSPCBarry, Camden, Cedar, Christian, Dade, Dallas and 19 more55 min
Apr 3, 12:33 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Cedar, Christian and 15 more87 min
Apr 3, 1:15 PM CDTTornado WatchSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more8 hr
Apr 3, 3:48 PM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Camden, Cedar, Christian and 18 more57 min
Apr 3, 4:34 PM CDTMesoscale DiscussionSPCDent, Howell, Oregon, Ozark, Shannon26 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.