Alert archive / Iowa / Mesoscale Discussions in 2006

Mesoscale Discussion 516

April 15, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2006, 5:00 PM CDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 15, 2006, 5:00 PM CDT (22:00 UTC)
Expired
Apr 15, 2006, 6:30 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 84 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Woodbury County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Nemaha County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Ray County, MO, Sullivan County, MO, Worth County, MO, Antelope County, NE, Boone County, NE, Burt County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Richardson County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Omaha radar (KOAX), 40 km from the middle of the area, began a volume at 22:02 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, 10.0 hours before the alert went out and 41 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 2006-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2006-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2751 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
85 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.

IssuedProductOfficeCountiesLasted
Apr 15, 5:28 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 26 more7 hr
Apr 15, 6:17 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Carroll, Cass, Clarke and 20 more88 min
Apr 15, 6:41 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 16 more94 min
Apr 15, 3:04 PM CDTTornado WatchSPCBrown, Clay, Jackson, Marshall, Nemaha, Pottawatomie and 2 more5 hr
Apr 15, 3:48 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Bourbon, Butler, Chase and 29 more87 min
Apr 15, 2:08 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Brown, Buffalo and 30 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Nebraska, 2006Mesoscale Discussions in Missouri, 2006Every mesoscale discussion in 2006

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.