Alert archive / South Dakota / Tornado Watches in 2019

Tornado Watch 564

August 9, 201931 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Aug 9, 2019, 2:09 PM CDT for 31 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2019, 2:09 PM CDT (19:09 UTC)
Expired: Aug 9, 2019, 9:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 70 kt

All 31 counties

Aurora County, SD, Beadle County, SD, Bennett County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Dewey County, SD, Douglas County, SD, Faulk County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The Aberdeen radar (KABR), 179 km from the middle of the area, began a volume at 19:09 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: 60%
One or more EF2 to EF5 tornadoes: 30%
Ten or more severe wind reports: 60%
One or more gusts of 65 knots or more: 60%
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: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 9, 2:30 PM CDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley, Sully	45 min
Aug 9, 2:45 PM CDT	Severe Thunderstorm Warning	ABR	Hyde, Sully	45 min
Aug 9, 2:57 PM CDT	Severe Thunderstorm Warning	ABR	Jones	48 min
Aug 9, 3:02 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley, Sully	43 min
Aug 9, 3:06 PM CDT	Severe Thunderstorm Warning	UNR	Jackson, Mellette	54 min
Aug 9, 3:11 PM CDT	Severe Thunderstorm Warning	ABR	Sully	34 min
Aug 9, 3:24 PM CDT	Severe Thunderstorm Warning	ABR	Hyde	36 min
Aug 9, 3:33 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	42 min
Aug 9, 3:47 PM CDT	Severe Thunderstorm Warning	ABR	Jones	43 min
Aug 9, 3:47 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	28 min
Aug 9, 3:59 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	61 min
Aug 9, 4:00 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	30 min
Aug 9, 4:15 PM CDT	Severe Thunderstorm Warning	ABR	Hughes	30 min
Aug 9, 4:16 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman, Stanley	44 min
Aug 9, 4:18 PM CDT	Tornado Warning	ABR	Hughes	27 min
Aug 9, 4:26 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	29 min
Aug 9, 4:26 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	34 min
Aug 9, 4:47 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman, Stanley	43 min
Aug 9, 4:55 PM CDT	Severe Thunderstorm Warning	UNR	Mellette, Tripp	65 min
Aug 9, 5:21 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Hughes, Lyman	54 min
Aug 9, 5:33 PM CDT	Severe Thunderstorm Warning	FSD	Brule	42 min
Aug 9, 5:34 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	56 min
Aug 9, 5:37 PM CDT	Severe Thunderstorm Warning	UNR	Tripp	68 min
Aug 9, 6:09 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix	51 min
Aug 9, 6:24 PM CDT	Severe Thunderstorm Warning	UNR	Jackson, Oglala Lakota, Pennington	66 min
Aug 9, 6:27 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Gregory	33 min
Aug 9, 6:40 PM CDT	Severe Thunderstorm Warning	UNR	Tripp	65 min
Aug 9, 6:57 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Davison, Douglas, Gregory	48 min
Aug 9, 7:03 PM CDT	Tornado Warning	FSD	Gregory	27 min
Aug 9, 7:15 PM CDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson	31 min
Aug 9, 7:29 PM CDT	Tornado Warning	FSD	Gregory	16 min
Aug 9, 7:38 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory, Hutchinson	52 min
Aug 9, 7:47 PM CDT	Tornado Warning	FSD	Gregory	28 min
Aug 9, 7:52 PM CDT	Flash Flood Warning	FSD	Gregory	6 hr
Aug 9, 8:16 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	29 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, 7.2 hours before the alert went out and 148 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1665 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 134 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.

Issued	Product	Office	Counties	Lasted
Aug 9, 1:47 PM CDT	Mesoscale Discussion	SPC	Bennett, Brule, Buffalo, Dewey, Gregory, Haakon and 15 more	88 min
Aug 9, 3:43 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Davison and 16 more	92 min
Aug 9, 6:03 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 24 more	57 min
Aug 9, 6:59 PM CDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 16 more	2 hr

Nearby

Tornado Watches in South Dakota, 2019 Every tornado watch in 2019

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.