Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1641

July 5, 20037 counties in Iowa; 22 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2003, 10:57 PM CDT for 7 counties in Iowa; 22 counties in Nebraska. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Jul 5, 2003, 10:57 PM CDT (03:57 UTC)
Expired
Jul 6, 2003, 12:00 AM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 29 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 80 km from the middle of the area, began a volume at 03:58 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 00:00Z, 4.0 hours before the alert went out and 79 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 2003-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2840 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 00:00Z on 2003-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 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
2840 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1471 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
232 m²/s²
Significant tornado parameter
1.8
Supercell composite
11.5

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
Jul 5, 7:20 PM CDTTornado WatchSPCFremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more6 hr
Jul 5, 7:51 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 30 more54 min
Jul 5, 8:04 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 2 more86 min
Jul 5, 10:46 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 28 more59 min
Jul 5, 11:50 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 36 more5 hr
Jul 6, 2:26 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Benton, Black Hawk, Boone and 49 more94 min
Jul 6, 4:33 AM CDTMesoscale DiscussionSPCAdair, Audubon, Carroll, Cass, Clarke, Crawford and 12 more87 min
Jul 6, 5:17 AM CDTMesoscale DiscussionSPCAllamakee, Cedar, Clinton, Dubuque, Jackson, Jones118 min
Jul 6, 9:48 AM CDTMesoscale DiscussionSPCClinton, Des Moines, Jackson, Lee, Louisa, Muscatine and 1 more117 min
Jul 6, 11:45 AM CDTTornado WatchSPCCedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 6 more6 hr
Jul 6, 5:28 PM CDTMesoscale DiscussionSPCClinton, Dubuque, Jackson, Scott62 min
Jul 6, 6:24 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Chase, Clay, Custer, Dawson and 26 more2 hr
Jul 6, 6:40 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Chase, Custer, Dawson, Dundy and 19 more5 hr

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Iowa, 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.