Alert archive / South Dakota / Tornado Watches in 2006

Tornado Watch 774

September 16, 200613 counties in Nebraska; 47 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Sep 16, 2006, 1:53 PM CDT for 13 counties in Nebraska; 47 counties in South Dakota. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Sep 16, 2006, 1:53 PM CDT (18:53 UTC)
Expired
Sep 16, 2006, 10:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 60 counties

Antelope County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Pierce County, NE, Rock County, NE, Thurston County, NE, Wayne County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD, Tripp County, SD, Turner County, SD, Union County, SD, Walworth County, SD, Yankton County, SD

The radar

The Aberdeen radar (KABR), 119 km from the middle of the area, began a volume at 18:56 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
40%
One or more EF2 to EF5 tornadoes
40%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 16, 3:03 PM CDTSevere Thunderstorm WarningFSDHutchinson27 min
Sep 16, 3:31 PM CDTSevere Thunderstorm WarningFSDHanson, Hutchinson44 min
Sep 16, 3:46 PM CDTTornado WarningFSDHanson, McCook29 min
Sep 16, 4:12 PM CDTTornado WarningFSDMcCook, Minnehaha48 min
Sep 16, 4:25 PM CDTSevere Thunderstorm WarningABRHughes, Stanley35 min
Sep 16, 4:29 PM CDTTornado WarningABRClark46 min
Sep 16, 4:32 PM CDTTornado WarningFSDLake, Moody43 min
Sep 16, 4:35 PM CDTSevere Thunderstorm WarningABREdmunds, McPherson25 min
Sep 16, 4:40 PM CDTSevere Thunderstorm WarningFSDBrule35 min
Sep 16, 4:48 PM CDTTornado WarningFSDBrookings42 min
Sep 16, 4:52 PM CDTTornado WarningFSDCharles Mix, Gregory38 min
Sep 16, 4:54 PM CDTSevere Thunderstorm WarningLBFBoyd21 min
Sep 16, 4:54 PM CDTTornado WarningABREdmunds, McPherson21 min
Sep 16, 4:56 PM CDTSevere Thunderstorm WarningABRDay, Marshall49 min
Sep 16, 5:03 PM CDTSevere Thunderstorm WarningUNRTripp42 min
Sep 16, 5:06 PM CDTSevere Thunderstorm WarningABRDeuel24 min
Sep 16, 5:08 PM CDTSevere Thunderstorm WarningFSDMcCook37 min
Sep 16, 5:09 PM CDTSevere Thunderstorm WarningABREdmunds, McPherson19 min
Sep 16, 5:11 PM CDTSevere Thunderstorm WarningABRFaulk49 min
Sep 16, 5:15 PM CDTTornado WarningFSDAurora, Brule, Jerauld45 min
Sep 16, 5:18 PM CDTTornado WarningFSDMoody42 min
Sep 16, 5:23 PM CDTTornado WarningFSDCharles Mix, Douglas37 min
Sep 16, 5:30 PM CDTSevere Thunderstorm WarningABREdmunds25 min
Sep 16, 5:33 PM CDTTornado WarningFSDHutchinson28 min
Sep 16, 5:37 PM CDTSevere Thunderstorm WarningFSDLake26 min
Sep 16, 5:40 PM CDTSevere Thunderstorm WarningABRCodington35 min
Sep 16, 5:44 PM CDTTornado WarningFSDSanborn31 min
Sep 16, 5:49 PM CDTSevere Thunderstorm WarningFSDHanson, McCook56 min
Sep 16, 5:52 PM CDTSevere Thunderstorm WarningFSDMoody23 min
Sep 16, 6:08 PM CDTTornado WarningFSDMoody37 min
Sep 16, 6:10 PM CDTTornado WarningFSDBeadle, Kingsbury50 min
Sep 16, 6:12 PM CDTTornado WarningFSDMcCook33 min
Sep 16, 6:13 PM CDTSevere Thunderstorm WarningABRCodington32 min
Sep 16, 6:27 PM CDTSevere Thunderstorm WarningABRGrant33 min
Sep 16, 6:27 PM CDTSevere Thunderstorm WarningFSDLake33 min
Sep 16, 6:51 PM CDTSevere Thunderstorm WarningABRHamlin24 min
Sep 16, 6:58 PM CDTTornado WarningFSDKingsbury17 min
Sep 16, 7:02 PM CDTSevere Thunderstorm WarningFSDMoody28 min
Sep 16, 8:18 PM CDTSevere Thunderstorm WarningABRMarshall27 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, 6.9 hours before the alert went out and 66 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 2006-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 561 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 2006-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.19395878Sfc1 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
561 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
92 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 15, 7:06 PM CDTTornado WatchSPCButler, Clay, Colfax, Cuming, Dodge, Fillmore and 12 more6 hr
Sep 15, 8:50 PM CDTSevere Thunderstorm WatchSPCBurt, Cass, Douglas, Johnson, Otoe, Sarpy and 1 more4 hr
Sep 15, 11:59 PM CDTMesoscale DiscussionSPCBuffalo, Custer, Dawson, Garfield, Gosper, Greeley and 10 more91 min
Sep 16, 1:25 PM CDTMesoscale DiscussionSPCCedar, Dakota, Dixon, Knox3 hr
Sep 16, 3:24 PM CDTMesoscale DiscussionSPCAntelope, Boyd, Brown, Burt, Cedar, Cuming and 10 more96 min
Sep 16, 3:56 PM CDTTornado WatchSPCAdams, Boone, Burt, Butler, Cass, Clay and 33 more7 hr
Sep 15, 8:32 PM CDTMesoscale DiscussionSPCBrookings, Lincoln, Minnehaha, Moody58 min
Sep 16, 6:12 PM CDTMesoscale DiscussionSPCBrookings, Clark, Clay, Codington, Day, Deuel and 16 more63 min

Nearby

Tornado Watches in South Dakota, 2006Tornado Watches in Nebraska, 2006Every tornado watch in 2006

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.