Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 1210

June 30, 201442 counties in Iowa; 24 counties in Nebraska; Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 7:16 AM CDT for 42 counties in Iowa; 24 counties in Nebraska; Union County, South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2014, 7:16 AM CDT (12:16 UTC)
Expired
Jun 30, 2014, 8:45 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 67 counties

Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cedar County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Marshall County, IA, Monona County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Union County, SD

The radar

The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 12:17 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 12:00Z, 0.3 hours before the alert went out and 192 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 12:00Z on 2014-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4563 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 12:00Z on 2014-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
4563 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
903 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
2.8
Supercell composite
12.1

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 29, 7:50 PM CDTMesoscale DiscussionSPCBuchanan, Clayton, Delaware, Dubuque, Fayette, Jackson and 2 more85 min
Jun 29, 8:15 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Buchanan, Cedar, Chickasaw, Clayton and 14 more7 hr
Jun 29, 9:43 PM CDTMesoscale DiscussionSPCAllamakee, Buchanan, Cedar, Clayton, Clinton, Delaware and 6 more92 min
Jun 29, 10:10 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Dallas, Decatur and 16 more65 min
Jun 29, 10:54 PM CDTTornado WatchSPCClinton, Jackson5 hr
Jun 30, 3:32 AM CDTMesoscale DiscussionSPCAudubon, Boone, Calhoun, Carroll, Cherokee, Crawford and 15 more58 min
Jun 30, 4:06 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Calhoun and 42 more10 hr
Jun 30, 9:08 AM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Harrison, Mills, Montgomery and 2 more67 min
Jun 30, 9:38 AM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 46 more10 hr
Jun 30, 10:48 AM CDTMesoscale DiscussionSPCAudubon, Calhoun, Carroll, Crawford, Greene, Guthrie and 7 more87 min
Jun 30, 1:27 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more93 min
Jun 30, 2:03 PM CDTTornado WatchSPCBenton, Buchanan, Cedar, Clayton, Clinton, Delaware and 17 more5 hr
Jun 30, 3:17 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 28 more58 min
Jun 30, 3:25 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 18 more35 min
Jun 30, 6:28 PM CDTMesoscale DiscussionSPCBenton, Cedar, Clinton, Dubuque, Iowa, Jackson and 10 more92 min
Jun 29, 11:53 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Custer, Dawson, Franklin and 13 more97 min
Jun 30, 1:02 AM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Blaine, Boone, Brown, Buffalo and 31 more10 hr
Jun 30, 12:06 PM CDTMesoscale DiscussionSPCPawnee, Richardson54 min
Jun 30, 3:52 PM CDTMesoscale DiscussionSPCGage, Johnson, Nemaha, Pawnee, Richardson113 min

Nearby

Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Nebraska, 2014Mesoscale Discussions in South Dakota, 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.