Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1685

July 15, 200432 counties in Nebraska; 8 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2004, 11:55 AM CDT for 32 counties in Nebraska; 8 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 15, 2004, 11:55 AM CDT (16:55 UTC)
Expired
Jul 15, 2004, 2:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 40 counties

Antelope County, NE, Boyd County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hutchinson County, SD, Turner County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 152 km from the middle of the area, began a volume at 16:55 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, 4.9 hours before the alert went out and 151 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 2004-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 2004-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.19395878Sfc1 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
13 J/kg
Mixed-layer CIN
-468 J/kg
Mixed-layer LCL
1009 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
127 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
Jul 14, 7:49 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more86 min
Jul 15, 9:32 AM CDTMesoscale DiscussionSPCDakota, Dixon118 min
Jul 15, 2:03 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Cedar and 22 more2 hr
Jul 15, 2:53 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 12 more3 hr
Jul 15, 3:00 PM CDTTornado WatchSPCAntelope, Boone, Boyd, Buffalo, Butler, Cedar and 23 more6 hr
Jul 15, 5:04 PM CDTMesoscale DiscussionSPCDundy86 min
Jul 15, 6:08 PM CDTMesoscale DiscussionSPCChase, Dawson, Dundy, Frontier, Furnas, Gosper and 4 more97 min
Jul 15, 6:25 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Chase, Dawson, Deuel, Dundy and 15 more7 hr
Jul 14, 10:07 PM CDTMesoscale DiscussionSPCButte, Custer, Fall River, Harding, Lawrence, Meade and 2 more53 min
Jul 15, 5:41 PM CDTMesoscale DiscussionSPCBrookings, Clark, Codington, Day, Deuel, Grant and 10 more94 min
Jul 15, 6:00 PM CDTSevere Thunderstorm WatchSPCClark, Codington, Day, Deuel, Grant, Hamlin and 2 more5 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in South Dakota, 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.