Alert archive / South Dakota / Severe Thunderstorm Watches in 2019

Severe Thunderstorm Watch 481

July 3, 201927 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 3, 2019, 7:09 PM CDT for 27 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 3, 2019, 7:09 PM CDT (00:09 UTC)
Expired
Jul 4, 2019, 2:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 27 counties

Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Corson County, SD, Davison County, SD, Dewey County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 103 km from the middle of the area, began a volume at 00:10 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
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 3, 7:22 PM CDTSevere Thunderstorm WarningABRLyman23 min
Jul 3, 7:24 PM CDTSevere Thunderstorm WarningABRLyman36 min
Jul 3, 7:44 PM CDTSevere Thunderstorm WarningABRJones, Lyman28 min
Jul 3, 8:08 PM CDTSevere Thunderstorm WarningABRBuffalo, Lyman52 min
Jul 3, 10:12 PM CDTSevere Thunderstorm WarningABRFaulk, Hand, Spink23 min
Jul 3, 10:14 PM CDTSevere Thunderstorm WarningFSDGregory46 min
Jul 3, 10:16 PM CDTSevere Thunderstorm WarningABRLyman44 min
Jul 3, 10:20 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, Potter, Walworth40 min
Jul 3, 10:34 PM CDTSevere Thunderstorm WarningFSDBrule, Charles Mix30 min
Jul 3, 10:40 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk25 min
Jul 3, 10:52 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory53 min
Jul 4, 12:47 AM CDTSevere Thunderstorm WarningABRMcPherson12 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 00:00Z, 0.2 hours before the alert went out and 74 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 2019-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 347 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 2019-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
347 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
2084 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 3, 10:13 PM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Campbell and 23 more92 min
Jul 3, 10:26 PM CDTMesoscale DiscussionSPCButte, Custer, Fall River, Lawrence, Meade, Pennington64 min
Jul 4, 2:56 PM CDTMesoscale DiscussionSPCCuster, Fall River2 hr
Jul 4, 3:31 PM CDTSevere Thunderstorm WatchSPCBennett, Butte, Custer, Fall River, Haakon, Jackson and 4 more8 hr
Jul 4, 3:36 PM CDTMesoscale DiscussionSPCBennett, Todd114 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2019Every severe thunderstorm 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.