Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1690

July 15, 200428 counties in Nebraska; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2004, 2:03 PM CDT for 28 counties in Nebraska; 13 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 15, 2004, 2:03 PM CDT (19:03 UTC)
Expired
Jul 15, 2004, 4:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 41 counties

Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Cuming County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Keya Paha County, NE, Knox County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Sanborn County, SD, Yankton County, SD

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.1 hours before the alert went out and 191 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, N. Platte/Lee Bi, NE at 12:00Z on 2004-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1600 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, N. Platte/Lee Bi, NE at 12:00Z on 2004-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 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
1600 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
1216 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
198 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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, 11:55 AM CDTMesoscale DiscussionSPCAntelope, Boyd, Burt, Butler, Cass, Cedar and 26 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.