Alert archive / Missouri / Mesoscale Discussions in 2018

Mesoscale Discussion 475

May 20, 2018Cherokee County, Crawford County, Kansas; 22 counties in Missouri; Ottawa County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 20, 2018, 2:24 PM CDT for Cherokee County, Crawford County, Kansas; 22 counties in Missouri; Ottawa County, Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2018, 2:24 PM CDT (19:24 UTC)
Expired
May 20, 2018, 5:00 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 25 counties

Cherokee County, KS, Crawford County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Johnson County, MO, Lawrence County, MO, McDonald County, MO, Morgan County, MO, Newton County, MO, Pettis County, MO, Polk County, MO, St. Clair County, MO, Stone County, MO, Vernon County, MO, Ottawa County, OK

The radar

The Springfield radar (KSGF), 66 km from the middle of the area, began a volume at 19:26 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 12:00Z, 7.4 hours before the alert went out and 70 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 12:00Z on 2018-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1422 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 12:00Z on 2018-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.193958Sfc1 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
1422 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1014 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.3

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 19, 7:41 PM CDTMesoscale DiscussionSPCAnderson, Coffey, Franklin, Linn, Lyon, Miami and 1 more94 min
May 20, 12:42 AM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Linn, Miami, Neosho3 hr
May 20, 3:32 PM CDTSevere Thunderstorm WatchSPCBourbon, Cherokee, Crawford4 hr
May 20, 11:43 AM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Dunklin, Mississippi, New Madrid and 3 more3 hr
May 20, 12:32 PM CDTSevere Thunderstorm WatchSPCButler, Cape Girardeau, Dunklin, Mississippi, New Madrid, Pemiscot and 2 more6 hr
May 20, 3:32 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Dunklin, Mississippi, New Madrid and 5 more118 min
May 20, 6:25 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cedar and 30 more95 min
May 20, 6:26 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot64 min
May 19, 9:58 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Jackson and 11 more107 min
May 20, 1:11 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 23 more2 hr

Nearby

Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Kansas, 2018Mesoscale Discussions in Oklahoma, 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.