Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 841

June 5, 201425 counties in Iowa; 15 counties in Minnesota; 7 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2014, 4:35 PM CDT for 25 counties in Iowa; 15 counties in Minnesota; 7 counties in Nebraska. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 5, 2014, 4:35 PM CDT (21:35 UTC)
Expired: Jun 5, 2014, 6:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 47 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Watonwan County, MN, Yellow Medicine County, MN, Burt County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Sarpy County, NE, Thurston County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 145 km from the middle of the area, began a volume at 21:36 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.

Tornado Watch 234Jun 5, 4:55 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.6 hours before the alert went out and 145 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: 446 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 51 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
Jun 5, 1:55 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 12 more	95 min
Jun 5, 4:55 PM CDT	Tornado Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 23 more	4 hr
Jun 4, 9:09 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 17 more	96 min

Nearby

Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Minnesota, 2014 Mesoscale Discussions in Nebraska, 2014 Every mesoscale discussion in 2014

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.