Alert archive / Missouri / Mesoscale Discussions in 2016

Mesoscale Discussion 771

May 28, 20165 counties in Illinois; 15 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 28, 2016, 3:09 PM CDT for 5 counties in Illinois; 15 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2016, 3:09 PM CDT (20:09 UTC)
Expired: May 28, 2016, 5:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Adams County, IL, Brown County, IL, Hancock County, IL, Pike County, IL, Schuyler County, IL, Callaway County, MO, Christian County, MO, Gasconade County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Warren County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 120 km from the middle of the area, began a volume at 20:12 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 12:00Z, 8.2 hours before the alert went out and 237 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 116 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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.

Issued	Product	Office	Counties	Lasted
May 28, 12:37 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson, Mercer, Rock Island	113 min
May 28, 1:37 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Boone, Brown, Bureau, Carroll, DeKalb and 24 more	7 hr
May 28, 5:33 PM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, Fulton, Hancock, Henderson, Henry and 15 more	57 min

Nearby

Mesoscale Discussions in Missouri, 2016 Mesoscale Discussions in Illinois, 2016 Every mesoscale discussion in 2016

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.