Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1844

August 2, 200421 counties in Nebraska; 25 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2004, 7:47 PM CDT for 21 counties in Nebraska; 25 counties in South Dakota. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2004, 7:47 PM CDT (00:47 UTC)
Expired
Aug 2, 2004, 8:45 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 46 counties

Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Colfax County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Stanton County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bennett 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, Haakon County, SD, Hanson County, SD, Hutchinson County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Oglala Lakota County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 00:47 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

Aberdeen, SD (KABR), launched 00:00Z, 0.8 hours before the alert went out and 221 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, Aberdeen, SD at 00:00Z on 2004-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1515 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, Aberdeen, SD at 00:00Z on 2004-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
1515 J/kg
Mixed-layer CIN
-118 J/kg
Mixed-layer LCL
973 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
178 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.8

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
Aug 3, 1:16 PM CDTMesoscale DiscussionSPCDakota, Dixon89 min
Aug 3, 3:00 PM CDTMesoscale DiscussionSPCBoone, Burt, Butler, Colfax, Cuming, Dakota and 11 more2 hr
Aug 3, 4:52 PM CDTMesoscale DiscussionSPCBurt, Butler, Cass, Clay, Colfax, Dodge and 23 more53 min
Aug 3, 5:00 PM CDTTornado WatchSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 12 more5 hr
Aug 3, 6:45 PM CDTMesoscale DiscussionSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 12 more90 min
Aug 2, 9:07 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade53 min
Aug 3, 2:02 AM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 17 more118 min
Aug 3, 2:30 AM CDTMesoscale DiscussionSPCHaakon, Hughes, Jones, Meade, Stanley, Ziebach2 hr
Aug 3, 3:00 AM CDTSevere Thunderstorm WatchSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 4 more5 hr
Aug 3, 5:04 AM CDTMesoscale DiscussionSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 2 more116 min
Aug 3, 7:21 AM CDTMesoscale DiscussionSPCAurora, Beadle, Brule, Buffalo, Davison, Douglas and 17 more54 min
Aug 3, 8:00 AM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Brule, Buffalo, Davison, Douglas and 14 more5 hr
Aug 3, 10:48 AM CDTMesoscale DiscussionSPCLincoln, Minnehaha, Moody, Turner87 min
Aug 3, 2:53 PM CDTMesoscale DiscussionSPCButte, Custer, Harding, Lawrence, Meade, Pennington and 1 more2 hr

Nearby

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