Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1789

July 19, 2005Lyon County, Sioux County, Iowa; Pipestone County, Rock County, Minnesota; 23 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2005, 11:18 PM CDT for Lyon County, Sioux County, Iowa; Pipestone County, Rock County, Minnesota; 23 counties in South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jul 19, 2005, 11:18 PM CDT (04:18 UTC)
Expired
Jul 20, 2005, 12:45 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 27 counties

Lyon County, IA, Sioux County, IA, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Brookings County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Hamlin 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, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 04:18 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, 4.3 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 00:00Z on 2005-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1994 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 2005-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
1994 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
2043 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
230 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.0

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
Jul 20, 1:25 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 12 more6 hr
Jul 20, 3:23 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Buena Vista and 35 more2 hr
Jul 20, 5:55 AM CDTMesoscale DiscussionSPCAllamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 37 more95 min
Jul 20, 11:26 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 26 more94 min
Jul 19, 10:43 PM CDTMesoscale DiscussionSPCMarshall, Norman, Pennington, Polk, Red Lake92 min
Jul 20, 1:28 AM CDTMesoscale DiscussionSPCBeltrami, Cook, Koochiching, Lake, Saint Louis32 min
Jul 19, 7:39 PM CDTMesoscale DiscussionSPCHughes, Jones, Lyman, Mellette, Sully, Todd and 1 more2 hr
Jul 20, 5:12 PM CDTMesoscale DiscussionSPCBennett, Custer, Haakon, Jackson, Meade, Oglala Lakota and 1 more93 min
Jul 20, 6:20 PM CDTSevere Thunderstorm WatchSPCBennett, Brule, Buffalo, Gregory, Jackson, Jones and 5 more5 hr

Nearby

Mesoscale Discussions in South Dakota, 2005Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Minnesota, 2005Every mesoscale discussion in 2005

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.