Alert archive / Iowa / Mesoscale Discussions in 2011

Mesoscale Discussion 250

March 22, 20118 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2011, 5:33 PM CDT for 8 counties in Iowa. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Mar 22, 2011, 5:33 PM CDT (22:33 UTC)
Expired: Mar 22, 2011, 6:30 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Harrison County, IA, Madison County, IA, Pottawattamie County, IA, Shelby County, IA

The radar

The Des Moines radar (KDMX), 114 km from the middle of the area, began a volume at 22:34 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 12:00Z, 10.6 hours before the alert went out and 120 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: 486 J/kg
Mixed-layer CIN: -475 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 477 m²/s²
0-3 km storm-relative helicity: 501 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 21, 10:05 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 17 more	115 min
Mar 22, 1:19 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Crawford, Fremont, Harrison, Mills and 7 more	116 min
Mar 22, 2:03 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 38 more	7 hr

Nearby

Mesoscale Discussions in Iowa, 2011 Every mesoscale discussion in 2011

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.