Alert archive / South Dakota / Tornado Watches in 2010

Tornado Watch 444

July 6, 201019 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jul 6, 2010, 2:23 PM CDT for 19 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 6, 2010, 2:23 PM CDT (19:23 UTC)
Expired
Jul 6, 2010, 9:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lyman County, SD, Miner County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD

The radar

The Sioux Falls radar (KFSD), 208 km from the middle of the area, began a volume at 19:23 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 6, 2:43 PM CDTSevere Thunderstorm WarningABRLyman47 min
Jul 6, 3:13 PM CDTSevere Thunderstorm WarningUNRTripp36 min
Jul 6, 3:20 PM CDTTornado WarningABRLyman40 min
Jul 6, 3:29 PM CDTSevere Thunderstorm WarningFSDBrule46 min
Jul 6, 3:46 PM CDTTornado WarningFSDBrule44 min
Jul 6, 4:13 PM CDTSevere Thunderstorm WarningFSDBrule47 min
Jul 6, 4:26 PM CDTTornado WarningFSDBrule34 min
Jul 6, 4:59 PM CDTTornado WarningFSDBrule46 min
Jul 6, 5:41 PM CDTTornado WarningFSDAurora, Brule, Charles Mix49 min
Jul 6, 5:43 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Douglas47 min
Jul 6, 6:28 PM CDTTornado WarningFSDAurora, Brule, Charles Mix, Douglas47 min
Jul 6, 7:13 PM CDTTornado WarningFSDAurora, Davison, Douglas47 min
Jul 6, 7:30 PM CDTSevere Thunderstorm WarningFSDBrule45 min
Jul 6, 7:55 PM CDTTornado WarningFSDAurora, Davison, Douglas, Hanson, Hutchinson26 min
Jul 6, 8:05 PM CDTTornado WarningFSDAurora, Brule30 min
Jul 6, 8:10 PM CDTSevere Thunderstorm WarningFSDAurora, Brule30 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 7.4 hours before the alert went out and 160 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 2010-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2010-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1555 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 6, 1:32 PM CDTMesoscale DiscussionSPCAurora, Brule, Buffalo, Gregory, Hand, Hughes and 7 more88 min
Jul 6, 5:59 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 20 more91 min

Nearby

Tornado Watches in South Dakota, 2010Every tornado watch in 2010

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.