Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 555

April 11, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2005, 10:55 AM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2005, 10:55 AM CDT (15:55 UTC)
Expired
Apr 11, 2005, 12:30 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 57 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Woodbury County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Geary County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 77 km from the middle of the area, began a volume at 15:59 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, 3.9 hours before the alert went out and 77 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 2005-04-11Temperature 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 2005-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.1939587897117Sfc1 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
1557 m above ground
0-6 km bulk shear
82 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
51 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 10, 7:49 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 36 more56 min
Apr 11, 11:55 AM CDTTornado WatchSPCAudubon, Carroll, Cass, Crawford, Fremont, Greene and 8 more8 hr
Apr 11, 5:01 PM CDTMesoscale DiscussionSPCAudubon, Carroll, Cass, Crawford, Fremont, Greene and 8 more59 min
Apr 10, 8:53 PM CDTMesoscale DiscussionSPCCherokee, Crawford, Labette, Montgomery2 hr
Apr 10, 9:23 PM CDTMesoscale DiscussionSPCButler, Clay, Cloud, Cowley, Dickinson, Ellsworth and 14 more2 hr
Apr 11, 2:01 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 10 more89 min
Apr 11, 5:40 PM CDTSevere Thunderstorm WatchSPCDoniphan, Johnson, Leavenworth, Linn, Miami, Wyandotte4 hr
Apr 10, 9:15 PM CDTSevere Thunderstorm WatchSPCBarry, Lawrence, McDonald, Newton, Stone7 hr
Apr 11, 1:23 AM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone67 min
Apr 11, 6:17 AM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Oregon, Pemiscot and 3 more118 min

Nearby

Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Nebraska, 2005Mesoscale Discussions in Kansas, 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.