Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 720

May 17, 200410 counties in Iowa; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 17, 2004, 1:42 PM CDT for 10 counties in Iowa; 25 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 17, 2004, 1:42 PM CDT (18:42 UTC)
Expired
May 17, 2004, 3:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 35 counties

Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Crawford County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Sac County, IA, Woodbury County, IA, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Howard County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Omaha radar (KOAX), 66 km from the middle of the area, began a volume at 18:43 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 12:00Z, 6.7 hours before the alert went out and 66 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 2004-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 207 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 12:00Z on 2004-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 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
207 J/kg
Mixed-layer CIN
-418 J/kg
Mixed-layer LCL
1116 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
250 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
May 16, 8:21 PM CDTMesoscale DiscussionSPCEmmet114 min
May 16, 9:26 PM CDTMesoscale DiscussionSPCAdams, Audubon, Buena Vista, Calhoun, Carroll, Cass and 28 more3 hr
May 17, 12:41 PM CDTMesoscale DiscussionSPCBenton, Buchanan, Clayton, Delaware, Dubuque, Jackson and 2 more3 hr
May 17, 3:52 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Benton, Cass, Clarke and 33 more113 min
May 17, 4:45 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 26 more5 hr
May 17, 6:44 PM CDTMesoscale DiscussionSPCDubuque61 min
May 16, 7:27 PM CDTMesoscale DiscussionSPCAntelope, Boone, Butler, Cedar, Colfax, Cuming and 18 more3 hr
May 16, 8:07 PM CDTMesoscale DiscussionSPCAdams, Clay, Fillmore, Franklin, Gage, Jefferson and 6 more83 min
May 17, 3:08 PM CDTMesoscale DiscussionSPCCass, Douglas, Fillmore, Gage, Jefferson, Johnson and 8 more3 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion in 2004

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.