Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2477

November 27, 200516 counties in Iowa; Atchison County, Missouri; 7 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Nov 27, 2005, 3:29 PM CST for 16 counties in Iowa; Atchison County, Missouri; 7 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 27, 2005, 3:29 PM CST (21:29 UTC)
Expired
Nov 27, 2005, 5:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 24 counties

Adair County, IA, Adams County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wayne County, IA, Atchison County, MO, Cass County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 119 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 119 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 2005-11-27Temperature 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 2005-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 square meters per square second.193958Sfc1 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
623 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
113 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
Nov 27, 5:38 PM CSTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 18 more3 hr
Nov 27, 12:36 PM CSTTornado WatchSPCBarton, Jasper, McDonald, Newton, Vernon7 hr
Nov 27, 2:50 PM CSTMesoscale DiscussionSPCAndrew, Barry, Barton, Bates, Benton, Boone and 50 more115 min
Nov 27, 3:05 PM CSTTornado WatchSPCAdair, Andrew, Atchison, Barry, Bates, Benton and 65 more7 hr
Nov 27, 4:39 PM CSTMesoscale DiscussionSPCButler, Carter, Dunklin, New Madrid, Pemiscot, Ripley and 2 more96 min
Nov 27, 5:58 PM CSTMesoscale DiscussionSPCAndrew, Barry, Bates, Benton, Boone, Buchanan and 52 more92 min
Nov 27, 1:37 PM CSTMesoscale DiscussionSPCChase, Dundy, Frontier, Furnas, Hayes, Hitchcock and 3 more4 hr

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Nebraska, 2005Mesoscale Discussions in Missouri, 2005Every mesoscale discussion in 2005

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.