Alert archive / South Dakota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 594

August 11, 20027 counties in Minnesota; Sargent County, North Dakota; 29 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2002, 7:00 PM CDT for 7 counties in Minnesota; Sargent County, North Dakota; 29 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 11, 2002, 7:00 PM CDT (00:00 UTC)
Expired
Aug 12, 2002, 12:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 37 counties

Big Stone County, MN, Douglas County, MN, Grant County, MN, Lac qui Parle County, MN, Pope County, MN, Stevens County, MN, Traverse County, MN, Sargent County, ND, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Tripp County, SD

The radar

The Aberdeen radar (KABR), 135 km from the middle of the area, began a volume at 00:04 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.

Warnings issued inside it

29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 11, 7:24 PM CDTSevere Thunderstorm WarningABRHand, Hyde51 min
Aug 11, 7:34 PM CDTSevere Thunderstorm WarningABRLyman26 min
Aug 11, 7:46 PM CDTSevere Thunderstorm WarningUNRTripp59 min
Aug 11, 7:58 PM CDTSevere Thunderstorm WarningFSDBeadle, Jerauld47 min
Aug 11, 8:02 PM CDTSevere Thunderstorm WarningABRFaulk, Spink43 min
Aug 11, 8:04 PM CDTSevere Thunderstorm WarningABRLyman56 min
Aug 11, 8:10 PM CDTSevere Thunderstorm WarningFSDBrule50 min
Aug 11, 8:12 PM CDTSevere Thunderstorm WarningABRBuffalo, Hand48 min
Aug 11, 8:28 PM CDTSevere Thunderstorm WarningFSDGregory32 min
Aug 11, 8:39 PM CDTSevere Thunderstorm WarningABRClark51 min
Aug 11, 8:47 PM CDTSevere Thunderstorm WarningFSDJerauld43 min
Aug 11, 8:53 PM CDTSevere Thunderstorm WarningFSDAurora37 min
Aug 11, 8:56 PM CDTSevere Thunderstorm WarningFSDSanborn49 min
Aug 11, 9:00 PM CDTSevere Thunderstorm WarningFSDBrule15 min
Aug 11, 9:05 PM CDTSevere Thunderstorm WarningFSDBeadle25 min
Aug 11, 9:08 PM CDTSevere Thunderstorm WarningABRCodington, Hamlin52 min
Aug 11, 9:10 PM CDTSevere Thunderstorm WarningABRDay50 min
Aug 11, 9:30 PM CDTSevere Thunderstorm WarningFSDAurora, Davison30 min
Aug 11, 9:33 PM CDTSevere Thunderstorm WarningABRGrant, Roberts42 min
Aug 11, 9:36 PM CDTSevere Thunderstorm WarningFSDHanson, Miner24 min
Aug 11, 9:57 PM CDTSevere Thunderstorm WarningABRDay18 min
Aug 11, 9:59 PM CDTSevere Thunderstorm WarningMPXLac qui Parle, Yellow Medicine61 min
Aug 11, 10:00 PM CDTSevere Thunderstorm WarningFSDDavison, Douglas30 min
Aug 11, 10:14 PM CDTSevere Thunderstorm WarningABRBig Stone61 min
Aug 11, 10:14 PM CDTSevere Thunderstorm WarningFSDHutchinson46 min
Aug 11, 10:22 PM CDTSevere Thunderstorm WarningFSDHanson53 min
Aug 11, 10:59 PM CDTSevere Thunderstorm WarningABRTraverse46 min
Aug 11, 11:15 PM CDTSevere Thunderstorm WarningFGFGrant45 min
Aug 11, 11:16 PM CDTSevere Thunderstorm WarningMPXPope, Stevens, Swift59 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.0 hours before the alert went out and 73 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 2002-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2317 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 2002-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
2317 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
2063 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 9:55 PM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Brown, Carver, Chippewa, Chisago and 26 more5 hr
Aug 12, 12:30 AM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Chisago, Dakota, Dodge, Faribault and 16 more6 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2002Severe Thunderstorm Watches in Minnesota, 2002Severe Thunderstorm Watches in North Dakota, 2002Every severe thunderstorm watch in 2002

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.