Alert archive / Iowa / Mesoscale Discussions in 2018

Mesoscale Discussion 390

May 12, 2018Rock Island County, Illinois; 38 counties in Iowa; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 12, 2018, 1:04 AM CDT for Rock Island County, Illinois; 38 counties in Iowa; 4 counties in Nebraska. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 12, 2018, 1:04 AM CDT (06:04 UTC)
Expired: May 12, 2018, 3:00 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 43 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Benton County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Montgomery County, IA, Muscatine County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Union County, IA, Warren County, IA, Washington County, IA, Rock Island County, IL, Cass County, NE, Douglas County, NE, Sarpy County, NE, Washington County, NE

The radar

The Des Moines radar (KDMX), 36 km from the middle of the area, began a volume at 06:05 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

Omaha, NE (KOAX), launched 00:00Z, 6.1 hours before the alert went out and 219 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 722 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Iowa, 2018 Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in Illinois, 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.