Alert archive / South Dakota / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 466

September 4, 20167 counties in North Dakota; 29 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 4, 2016, 4:53 PM CDT for 7 counties in North Dakota; 29 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Sep 4, 2016, 4:53 PM CDT (21:53 UTC)
Expired
Sep 5, 2016, 12:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 36 counties

Dickey County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Clark County, SD, Davison County, SD, Day 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, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 106 km from the middle of the area, began a volume at 21:56 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
5%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 4, 5:27 PM CDTSevere Thunderstorm WarningABRHughes, Stanley48 min
Sep 4, 6:00 PM CDTSevere Thunderstorm WarningABRHughes, Stanley, Sully45 min
Sep 4, 6:08 PM CDTSevere Thunderstorm WarningABRJones39 min
Sep 4, 6:38 PM CDTSevere Thunderstorm WarningABRJones, Lyman52 min
Sep 4, 7:13 PM CDTSevere Thunderstorm WarningABRBuffalo, Hand, Hughes, Hyde, Lyman47 min
Sep 4, 7:54 PM CDTSevere Thunderstorm WarningABRCampbell36 min
Sep 4, 8:29 PM CDTSevere Thunderstorm WarningABRJones, Lyman, Stanley61 min
Sep 4, 9:05 PM CDTSevere Thunderstorm WarningABRJones, Lyman, Stanley25 min
Sep 4, 9:22 PM CDTSevere Thunderstorm WarningABRBuffalo, Hand, Hughes, Hyde, Jones, Lyman and 1 more53 min
Sep 4, 9:49 PM CDTSevere Thunderstorm WarningFSDGregory56 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, 9.9 hours before the alert went out and 64 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 2016-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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 12:00Z on 2016-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 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
37 J/kg
Mixed-layer CIN
-585 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
168 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
Sep 4, 6:56 PM CDTMesoscale DiscussionSPCWilkin94 min
Sep 4, 5:32 AM CDTMesoscale DiscussionSPCBenson, Burleigh, Cavalier, Ramsey, Sheridan, Wells118 min
Sep 4, 10:05 AM CDTMesoscale DiscussionSPCBarnes, Grand Forks, Griggs, LaMoure, Nelson, Pembina and 2 more115 min
Sep 4, 2:46 PM CDTMesoscale DiscussionSPCBennett, Haakon, Jackson, Jones, Lyman, Mellette and 4 more119 min
Sep 4, 3:24 PM CDTSevere Thunderstorm WatchSPCBennett, Custer, Fall River, Haakon, Jackson, Mellette and 4 more7 hr
Sep 4, 4:01 PM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Edmunds and 13 more89 min
Sep 4, 6:07 PM CDTMesoscale DiscussionSPCBennett, Custer, Fall River, Jackson, Oglala Lakota113 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2016Severe Thunderstorm Watches in North Dakota, 2016Every severe thunderstorm watch in 2016

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.