Alert archive / Missouri / Mesoscale Discussions in 2014

Mesoscale Discussion 345

April 13, 201414 counties in Arkansas; 11 counties in Illinois; 30 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2014, 9:12 PM CDT for 14 counties in Arkansas; 11 counties in Illinois; 30 counties in Missouri. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2014, 9:12 PM CDT (02:12 UTC)
Expired
Apr 13, 2014, 10:15 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 55 counties

Clay County, AR, Craighead County, AR, Cross County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Woodruff County, AR, Bond County, IL, Calhoun County, IL, Clinton County, IL, Jackson County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Dunklin County, MO, Franklin County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The Memphis radar (KNQA), 177 km from the middle of the area, began a volume at 02:13 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 00:00Z, 2.2 hours before the alert went out and 271 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 00:00Z on 2014-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 316 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 00:00Z on 2014-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 353 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
316 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
911 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
353 m²/s²
0-3 km storm-relative helicity
386 m²/s²
Significant tornado parameter
0.3
Supercell composite
5.4

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 13, 7:14 PM CDTSevere Thunderstorm WatchSPCClark, Cleburne, Conway, Crawford, Faulkner, Franklin and 16 more6 hr
Apr 13, 7:54 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more66 min
Apr 13, 10:33 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 49 more57 min
Apr 13, 11:06 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 28 more6 hr
Apr 14, 1:22 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 6 more53 min
Apr 14, 1:50 AM CDTTornado WatchSPCAshley, Chicot5 hr
Apr 14, 2:05 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Desha, Drew, Hempstead and 5 more85 min

Nearby

Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Arkansas, 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.