Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 917

May 31, 201322 counties in Illinois; 38 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 8:46 PM CDT for 22 counties in Illinois; 38 counties in Missouri. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
May 31, 2013, 8:46 PM CDT (01:46 UTC)
Expired
May 31, 2013, 9:45 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 60 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, Barry County, MO, Camden County, MO, Christian County, MO, City of Saint Louis, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Newton County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Stone County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 146 km from the middle of the area, began a volume at 01:49 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, 1.8 hours before the alert went out and 212 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 2013-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2316 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 2013-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 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
2316 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1144 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
3.0
Supercell composite
16.6

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 31, 7:05 PM CDTMesoscale DiscussionSPCBond, Calhoun, Christian, Greene, Jersey, Macon and 5 more85 min
May 31, 7:23 PM CDTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 12 more6 hr
May 31, 9:37 PM CDTTornado WatchSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more6 hr
May 31, 9:47 PM CDTMesoscale DiscussionSPCIroquois58 min
May 31, 10:11 PM CDTTornado WatchSPCFord, Iroquois5 hr
Jun 1, 1:13 AM CDTMesoscale DiscussionSPCCrawford, Lawrence, Wabash2 hr
Jun 1, 1:51 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more114 min
Jun 1, 3:46 AM CDTMesoscale DiscussionSPCMassac29 min
Jun 1, 9:53 AM CDTMesoscale DiscussionSPCDunklin2 hr

Nearby

Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Every mesoscale discussion in 2013

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.