Alert archive / Iowa / Mesoscale Discussions in 2018

Mesoscale Discussion 343

May 3, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 7:43 PM CDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: May 3, 2018, 7:43 PM CDT (00:43 UTC)
Expired: May 3, 2018, 8:45 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 44 counties

Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Nemaha County, KS, Pottawatomie County, KS, Shawnee County, KS, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Sullivan County, MO, Worth County, MO, Richardson County, NE

The radar

The Pleasant Hill radar (KEAX), 171 km from the middle of the area, began a volume at 00:44 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

Topeka, KS (KFOE), launched 00:00Z, 0.7 hours before the alert went out and 171 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: 981 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Iowa, 2018 Mesoscale Discussions in Missouri, 2018 Mesoscale Discussions in Kansas, 2018 Every 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.