Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1917

July 20, 20036 counties in Minnesota; 20 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 5:14 PM CDT for 6 counties in Minnesota; 20 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 20, 2003, 5:14 PM CDT (22:14 UTC)
Expired
Jul 20, 2003, 7:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 26 counties

Lincoln County, MN, Lyon County, MN, Murray County, MN, Pipestone County, MN, Rock County, MN, Yellow Medicine County, MN, Aurora County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Tripp County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 22:16 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 12:00Z, 10.2 hours before the alert went out and 162 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 12:00Z on 2003-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 95 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 12:00Z on 2003-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 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
95 J/kg
Mixed-layer CIN
-626 J/kg
Mixed-layer LCL
1014 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
446 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 19, 7:16 PM CDTMesoscale DiscussionSPCBeltrami, Clearwater, Itasca, Kittson, Koochiching, Marshall and 5 more89 min
Jul 19, 11:00 PM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 7 more5 hr
Jul 20, 1:15 AM CDTSevere Thunderstorm WatchSPCBig Stone, Chippewa, Cottonwood, Douglas, Grant, Jackson and 15 more6 hr
Jul 20, 2:03 AM CDTMesoscale DiscussionSPCBig Stone, Chippewa, Grant, Lac qui Parle, Lincoln, Lyon and 6 more117 min
Jul 20, 3:05 AM CDTSevere Thunderstorm WatchSPCBecker, Clay, Grant, Norman, Otter Tail, Wilkin4 hr
Jul 20, 4:14 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 34 more3 hr
Jul 20, 6:45 AM CDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Cottonwood, Faribault, Freeborn, Jackson and 15 more5 hr
Jul 20, 10:07 AM CDTMesoscale DiscussionSPCCottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 3 more53 min
Jul 20, 1:16 PM CDTMesoscale DiscussionSPCBeltrami, Cook, Itasca, Koochiching, Lake, Lake of the Woods and 2 more119 min
Jul 20, 1:55 PM CDTSevere Thunderstorm WatchSPCCarlton, Lake, Saint Louis7 hr
Jul 20, 3:27 PM CDTMesoscale DiscussionSPCCarlton, Lake, Saint Louis63 min
Jul 20, 6:47 PM CDTMesoscale DiscussionSPCLake, Saint Louis88 min
Jul 19, 11:58 PM CDTMesoscale DiscussionSPCBrown, Clark, Codington, Day, Deuel, Edmunds and 6 more62 min
Jul 20, 2:09 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Hutchinson, Lincoln, Minnehaha and 3 more66 min
Jul 20, 2:50 PM CDTTornado WatchSPCBon Homme, Clay, Union, Yankton6 hr

Nearby

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