Alert archive / Iowa / Mesoscale Discussions in 2016

Mesoscale Discussion 1156

July 5, 201619 counties in Iowa; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2016, 10:15 PM CDT for 19 counties in Iowa; 4 counties in Nebraska. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 5, 2016, 10:15 PM CDT (03:15 UTC)
Expired
Jul 5, 2016, 11:45 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 23 counties

Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Crawford County, IA, Franklin County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Webster County, IA, Wright County, IA, Burt County, NE, Dodge County, NE, Douglas County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 125 km from the middle of the area, began a volume at 03:17 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 00:00Z, 3.3 hours before the alert went out and 125 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 2016-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4273 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 2016-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939Sfc1 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
4273 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
1614 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 7:38 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, O'Brien, Osceola, Winnebago97 min
Jul 5, 8:10 PM CDTSevere Thunderstorm WatchSPCHarrison, Monona, Pottawattamie, Shelby5 hr
Jul 5, 8:38 PM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Cedar, Clayton and 9 more67 min
Jul 5, 9:50 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 16 more7 hr
Jul 5, 10:35 PM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Boone, Calhoun, Carroll, Cass and 22 more5 hr
Jul 5, 10:46 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 9 more89 min
Jul 6, 1:27 AM CDTMesoscale DiscussionSPCAdair, Appanoose, Benton, Cedar, Clarke, Clinton and 29 more2 hr
Jul 6, 1:55 AM CDTSevere Thunderstorm WatchSPCDes Moines, Henry, Jefferson, Lee, Louisa, Van Buren6 hr
Jul 6, 5:04 AM CDTMesoscale DiscussionSPCDes Moines, Henry, Jefferson, Lee, Van Buren116 min
Jul 5, 7:31 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Butler, Clay, Custer, Dawson and 30 more119 min
Jul 6, 3:21 PM CDTMesoscale DiscussionSPCArthur, Chase, Deuel, Dundy, Garden, Hayes and 5 more54 min
Jul 6, 3:21 PM CDTTornado WatchSPCBlaine, Box Butte, Brown, Cherry, Dawes, Grant and 6 more7 hr
Jul 6, 3:49 PM CDTSevere Thunderstorm WatchSPCArthur, Boyd, Buffalo, Chase, Custer, Dawson and 23 more8 hr
Jul 6, 6:48 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Cedar and 24 more57 min

Nearby

Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Nebraska, 2016Every mesoscale discussion in 2016

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.