Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 633

April 29, 200323 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 51 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 10:40 PM CDT for 23 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 51 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2003, 10:40 PM CDT (03:40 UTC)
Expired
Apr 30, 2003, 12:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 77 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Atchison County, MO, Holt County, MO, Nodaway County, MO, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Omaha radar (KOAX), 50 km from the middle of the area, began a volume at 03:43 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.7 hours before the alert went out and 50 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 2003-04-30Temperature 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 00:00Z on 2003-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 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
905 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
339 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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 29, 7:00 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 13 more3 hr
Apr 29, 7:30 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 17 more7 hr
Apr 30, 11:04 AM CDTMesoscale DiscussionSPCCedar, Clinton, Dubuque, Jackson, Jones, Scott116 min
Apr 30, 12:22 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Lee113 min
Apr 30, 1:00 PM CDTSevere Thunderstorm WatchSPCDes Moines, Louisa, Muscatine, Scott5 hr
Apr 30, 2:49 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Decatur, Lucas, Monroe, Page and 3 more116 min
Apr 30, 3:24 PM CDTMesoscale DiscussionSPCDes Moines, Louisa, Muscatine2 hr
Apr 30, 5:15 PM CDTTornado WatchSPCAppanoose, Cedar, Clarke, Clinton, Davis, Decatur and 23 more6 hr
Apr 29, 8:45 PM CDTSevere Thunderstorm WatchSPCAtchison, Holt, Nodaway5 hr
Apr 29, 7:56 PM CDTMesoscale DiscussionSPCFranklin, Furnas, Harlan, Red Willow2 hr
Apr 29, 10:29 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Hayes, Hitchcock, Red Willow2 hr
Apr 30, 1:22 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Butler, Cass, Clay, Dawson and 30 more113 min
Apr 30, 1:49 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Butler, Cass, Clay, Dawson and 30 more116 min

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Missouri, 2003Every mesoscale discussion in 2003

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.