Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 513

April 17, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 11:46 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2013, 11:46 PM CDT (04:46 UTC)
Expired
Apr 18, 2013, 1:15 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 46 counties

Calhoun County, IL, Greene County, IL, Morgan County, IL, Pike County, IL, Scott County, IL, Cherokee County, KS, Audrain County, MO, Barry County, MO, Barton County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Cole County, MO, Cooper County, MO, Dade County, MO, Dallas County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Howard County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Lincoln County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, St. Clair County, MO, Stone County, MO, Warren County, MO, Webster County, MO, Craig County, OK, Ottawa County, OK

The radar

The Springfield radar (KSGF), 77 km from the middle of the area, began a volume at 04:47 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

Springfield, MO (KSGF), launched 00:00Z, 4.8 hours before the alert went out and 128 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 2013-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1964 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 2013-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
1964 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1350 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.2

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 17, 8:21 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more84 min
Apr 17, 8:53 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Pike, Scott97 min
Apr 17, 9:57 PM CDTTornado WatchSPCAdams, Brown, Pike7 hr
Apr 17, 10:48 PM CDTMesoscale DiscussionSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 12 more57 min
Apr 18, 2:01 AM CDTMesoscale DiscussionSPCCalhoun, Jersey89 min
Apr 18, 4:02 AM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Monroe58 min
Apr 18, 5:36 AM CDTMesoscale DiscussionSPCBond, Clinton, Fayette, Madison, Monroe, Montgomery and 3 more54 min
Apr 18, 5:42 AM CDTTornado WatchSPCBond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more8 hr
Apr 18, 7:25 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 17 more95 min
Apr 18, 8:31 AM CDTTornado Watch PDSSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 6 more7 hr
Apr 18, 9:25 AM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more8 hr
Apr 18, 11:14 AM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Jasper, Lawrence, Marion and 4 more2 hr
Apr 18, 12:48 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more87 min
Apr 18, 2:47 PM CDTMesoscale DiscussionSPCClark, Crawford, Lawrence88 min
Apr 18, 7:26 AM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Dunklin, Howell and 9 more2 hr
Apr 17, 8:36 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 41 more84 min
Apr 17, 10:37 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Comanche and 35 more53 min
Apr 17, 10:47 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Carter, Cherokee, Coal and 28 more7 hr
Apr 18, 4:29 AM CDTMesoscale DiscussionSPCMarshall91 min

Nearby

Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Oklahoma, 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.