Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1448

June 21, 20038 counties in Nebraska; 21 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2003, 10:26 PM CDT for 8 counties in Nebraska; 21 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2003, 10:26 PM CDT (03:26 UTC)
Expired
Jun 22, 2003, 12:00 AM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 29 counties

Blaine County, NE, Boyd County, NE, Brown County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Aurora County, SD, Beadle County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Gregory County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD, Sanborn County, SD, Spink County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 185 km from the middle of the area, began a volume at 03:29 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, 3.4 hours before the alert went out and 193 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 2003-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4880 joules per kilogram.LCLEL10008507005003002001001 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 2003-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
4880 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
801 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
3.6
Supercell composite
20.0

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
Jun 21, 7:54 PM CDTMesoscale DiscussionSPCAntelope, Arthur, Blaine, Boone, Boyd, Brown and 25 more66 min
Jun 21, 8:15 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more6 hr
Jun 22, 1:27 AM CDTMesoscale DiscussionSPCAntelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more63 min
Jun 22, 4:38 AM CDTMesoscale DiscussionSPCCass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 5 more97 min
Jun 22, 9:30 AM CDTMesoscale DiscussionSPCBurt, Cass, Cuming, Dodge, Douglas, Gage and 10 more3 hr
Jun 22, 2:27 PM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Butler, Cedar, Colfax and 18 more2 hr
Jun 22, 3:35 PM CDTTornado WatchSPCAdams, Antelope, Boone, Boyd, Buffalo, Burt and 57 more5 hr
Jun 22, 5:29 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Clay, Fillmore, Greeley and 15 more61 min
Jun 21, 9:13 PM CDTMesoscale DiscussionSPCBrown, Day, Grant, Marshall, Roberts92 min
Jun 22, 12:45 AM CDTMesoscale DiscussionSPCBrown, Day, Edmunds, Grant, McPherson, Marshall and 1 more60 min
Jun 22, 1:47 PM CDTMesoscale DiscussionSPCButte, Custer, Fall River, Harding, Lawrence, Meade and 2 more118 min
Jun 22, 2:15 PM CDTSevere Thunderstorm WatchSPCButte, Corson, Custer, Dewey, Fall River, Haakon and 11 more7 hr
Jun 22, 2:55 PM CDTTornado WatchSPCBeadle, Brookings, Brown, Clark, Codington, Day and 12 more6 hr
Jun 22, 5:48 PM CDTMesoscale DiscussionSPCButte, Corson, Custer, Dewey, Haakon, Harding and 8 more117 min
Jun 22, 5:59 PM CDTMesoscale DiscussionSPCBeadle, Brookings, Clark, Codington, Day, Deuel and 5 more61 min

Nearby

Mesoscale Discussions in South Dakota, 2003Mesoscale Discussions in Nebraska, 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.