Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 1029

June 16, 201421 counties in Iowa; 15 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2014, 9:11 PM CDT for 21 counties in Iowa; 15 counties in Nebraska. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jun 16, 2014, 9:11 PM CDT (02:11 UTC)
Expired
Jun 16, 2014, 10:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 36 counties

Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Jasper County, IA, Marshall County, IA, Monona County, IA, Plymouth County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Webster County, IA, Woodbury County, IA, Antelope County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 02:15 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.2 hours before the alert went out and 126 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2014-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3563 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2014-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 248 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3563 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1174 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
248 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
4.8
Supercell composite
28.3

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.

IssuedProductOfficeCountiesLasted
Jun 16, 9:01 PM CDTSevere Thunderstorm WatchSPCBenton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 13 more8 hr
Jun 16, 9:56 PM CDTSevere Thunderstorm WatchSPCAdair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 34 more5 hr
Jun 16, 11:11 PM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 23 more64 min
Jun 16, 11:40 PM CDTMesoscale DiscussionSPCCedar, Clinton, Iowa, Jackson, Johnson, Jones and 5 more65 min
Jun 17, 1:29 AM CDTMesoscale DiscussionSPCAppanoose, Cedar, Clarke, Davis, Decatur, Des Moines and 23 more91 min
Jun 17, 3:41 AM CDTMesoscale DiscussionSPCClinton, Jackson, Scott64 min
Jun 17, 5:12 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Lyon, O'Brien, Osceola and 2 more2 hr
Jun 17, 6:48 PM CDTTornado WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more6 hr
Jun 17, 3:22 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Garden, Kimball, Morrill and 3 more113 min
Jun 17, 4:53 PM CDTTornado WatchSPCBlaine, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more6 hr

Nearby

Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Nebraska, 2014Every 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.