Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1822

August 1, 20044 counties in Minnesota; 23 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2004, 7:22 PM CDT for 4 counties in Minnesota; 23 counties in South Dakota. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Aug 1, 2004, 7:22 PM CDT (00:22 UTC)
Expired
Aug 1, 2004, 8:15 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 27 counties

Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Swift County, MN, Beadle County, SD, Brookings County, SD, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hyde County, SD, Kingsbury County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 27 km from the middle of the area, began a volume at 00:21 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

Aberdeen, SD (KABR), launched 00:00Z, 0.4 hours before the alert went out and 38 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 2004-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3501 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 2004-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
3501 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
1092 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
305 m²/s²
Significant tornado parameter
3.8
Supercell composite
15.7

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 2, 12:20 AM CDTSevere Thunderstorm WatchSPCMurray, Nobles, Pipestone, Rock4 hr
Aug 2, 12:53 AM CDTMesoscale DiscussionSPCBecker, Beltrami, Cass, Clay, Clearwater, Hubbard and 12 more97 min
Aug 2, 3:00 AM CDTSevere Thunderstorm WatchSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more5 hr
Aug 2, 3:02 AM CDTMesoscale DiscussionSPCMurray, Nobles, Rock58 min
Aug 2, 5:17 AM CDTMesoscale DiscussionSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more88 min
Aug 2, 6:41 AM CDTMesoscale DiscussionSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more64 min
Aug 2, 3:12 PM CDTMesoscale DiscussionSPCBlue Earth, Brown, Cottonwood, Dodge, Faribault, Freeborn and 18 more2 hr
Aug 2, 3:50 PM CDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Cottonwood, Faribault, Freeborn, Jackson and 14 more5 hr
Aug 1, 7:45 PM CDTTornado WatchSPCBeadle, Brookings, Brown, Buffalo, Campbell, Clark and 26 more6 hr
Aug 1, 10:00 PM CDTMesoscale DiscussionSPCBeadle, Buffalo, Campbell, Edmunds, Faulk, Hand and 7 more60 min
Aug 1, 10:35 PM CDTSevere Thunderstorm WatchSPCAurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 6 more5 hr
Aug 1, 11:29 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more61 min
Aug 2, 4:23 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 5 more37 min
Aug 2, 6:30 PM CDTSevere Thunderstorm WatchSPCAurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 17 more6 hr

Nearby

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