Alert archive / Missouri / Mesoscale Discussions in 2018

Mesoscale Discussion 327

May 2, 201812 counties in Arkansas; Adams County, Calhoun County, Pike County, Illinois; 60 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 2, 2018, 10:20 PM CDT for 12 counties in Arkansas; Adams County, Calhoun County, Pike County, Illinois; 60 counties in Missouri. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 2, 2018, 10:20 PM CDT (03:20 UTC)
Expired
May 3, 2018, 12:15 AM CDT
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 75 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Washington County, AR, Adams County, IL, Calhoun County, IL, Pike County, IL, 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, City of Saint Louis, MO, Cole County, 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, Hickory County, MO, Howell County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Knox County, MO, Laclede County, MO, Lawrence County, MO, Lewis County, MO, Lincoln County, MO, Maries County, MO, Marion County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Louis County, MO, Shannon County, MO, Shelby County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 95 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 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, 3.3 hours before the alert went out and 146 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 2018-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1170 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 2018-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
1170 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1041 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 11:09 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more7 hr
May 3, 2:32 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Franklin, Fulton, Izard and 6 more88 min
May 3, 9:02 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Sebastian, Washington88 min
May 3, 12:35 PM CDTMesoscale DiscussionSPCBoone, Carroll, Clark, Conway, Crawford, Franklin and 22 more85 min
May 3, 1:44 PM CDTSevere Thunderstorm WatchSPCBaxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more4 hr
May 3, 3:45 PM CDTMesoscale DiscussionSPCArkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more60 min
May 3, 4:52 PM CDTMesoscale DiscussionSPCBaxter, Clark, Clay, Cleburne, Cleveland, Conway and 31 more53 min
May 2, 7:21 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more84 min
May 2, 10:01 PM CDTMesoscale DiscussionSPCBureau, DeKalb, DuPage, Grundy, Henderson, Henry and 18 more89 min
May 2, 10:51 PM CDTSevere Thunderstorm WatchSPCCass, Cook, DeKalb, DuPage, Ford, Fulton and 23 more4 hr
May 3, 1:57 AM CDTMesoscale DiscussionSPCBureau, Cook, DeKalb, DeWitt, DuPage, Ford and 22 more93 min
May 2, 8:00 PM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Bates, Benton, Buchanan and 33 more90 min
May 2, 11:09 PM CDTMesoscale DiscussionSPCMcDonald96 min
May 3, 2:36 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more114 min
May 3, 2:57 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more6 hr
May 3, 5:58 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more92 min

Nearby

Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Illinois, 2018Every mesoscale discussion in 2018

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.