Alert archive / Missouri / Mesoscale Discussions in 2018

Mesoscale Discussion 884

June 26, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2018, 7:39 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 26, 2018, 7:39 AM CDT (12:39 UTC)
Expired
Jun 26, 2018, 9:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 119 counties

Alexander County, IL, Bond County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clay County, IN, Daviess County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Montgomery County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Ballard County, KY, Crittenden County, KY, Henderson County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Webster County, KY, Benton County, MO, Bollinger County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cape Girardeau County, MO, Cass County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Henry County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Perry County, MO, Pettis 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, Scott County, MO, Shannon County, MO, St. Clair County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 44 km from the middle of the area, began a volume at 12:41 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

Lincoln, IL (KILX), launched 12:00Z, 0.7 hours before the alert went out and 282 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, Lincoln, IL at 12:00Z on 2018-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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, Lincoln, IL at 12:00Z on 2018-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 313 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
149 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
1013 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
313 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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
Jun 25, 8:08 PM CDTMesoscale DiscussionSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more2 hr
Jun 26, 2:19 AM CDTMesoscale DiscussionSPCMonroe116 min
Jun 26, 9:26 AM CDTSevere Thunderstorm WatchSPCEdwards, Gallatin, Hardin, Massac, Pope, Saline and 2 more5 hr
Jun 26, 1:31 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Jo Daviess, Kane and 5 more89 min
Jun 26, 1:53 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Jackson, Johnson, Perry, Pulaski and 3 more67 min
Jun 26, 2:22 PM CDTSevere Thunderstorm WatchSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 10 more6 hr
Jun 26, 11:08 AM CDTMesoscale DiscussionSPCPerry, Spencer67 min
Jun 26, 12:18 PM CDTMesoscale DiscussionSPCDearborn87 min
Jun 26, 1:43 PM CDTMesoscale DiscussionSPCMcCreary, Wayne62 min
Jun 26, 5:26 PM CDTSevere Thunderstorm WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Jun 26, 12:16 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 10 more59 min
Jun 26, 12:35 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 31 more7 hr
Jun 26, 12:56 PM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone64 min
Jun 26, 1:26 PM CDTSevere Thunderstorm WatchSPCBarry, Christian, Douglas, Jasper, Lawrence, McDonald and 4 more6 hr
Jun 26, 2:46 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more89 min
Jun 26, 6:49 PM CDTMesoscale DiscussionSPCHowell, Oregon, Ozark, Ripley116 min

Nearby

Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Indiana, 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.