Alert archive / South Dakota / Tornado Warnings in 2010

Tornado Warning 49, NWS Sioux Falls, SD

August 30, 2010Davison County, Sanborn County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 30, 2010, 6:11 PM CDT for Davison County, Sanborn County, South Dakota. It was in force for 24 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 30, 2010, 6:11 PM CDT (23:11 UTC)
Expired
Aug 30, 2010, 6:35 PM CDT
In force
24 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon

Counties Davison County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 123 km from the middle of the area, began a volume at 23:12 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 was reported inside it

TimeReportWhereRemark
Aug 30, 6:12 PM CDTTSTM WND GST 707 Nnw Mount Vernon, SDHAIL TO THE SIZE OF QUARTERS
Aug 30, 6:20 PM CDTTSTM WND GST 802 Wsw Letcher, SD5 GRAIN BINS DESTROYED. TREES 2 TO 3 FEET IN DIAMETER UPROOTED. DAMAGE EXTENDS TO W SIDE OF LETCHER.
Aug 30, 6:38 PM CDTTSTM WND GST 702 Nw Forestburg, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 30, 3:23 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 112 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 2010-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 357 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2010-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 199 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
357 J/kg
Mixed-layer CIN
-450 J/kg
Mixed-layer LCL
1401 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
199 m²/s²
0-3 km storm-relative helicity
235 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

838 
WFUS53 KFSD 302311
TORFSD
SDC035-111-302345-
/O.NEW.KFSD.TO.W.0049.100830T2311Z-100830T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
611 PM CDT MON AUG 30 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  SOUTHERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 645 PM CDT

* AT 611 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR MOUNT VERNON...OR 10 MILES WEST OF
  MITCHELL...AND MOVING NORTHEAST AT 50 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  LETCHER AROUND 620 PM CDT...
  FORESTBURG AROUND 630 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR!

&&

LAT...LON 4405 9829 4403 9792 4369 9816 4370 9833
TIME...MOT...LOC 2311Z 208DEG 43KT 4379 9820

$$

SCHUMACHER
2 follow-up statements
490 
WWUS53 KFSD 302316
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
616 PM CDT MON AUG 30 2010

SDC035-111-302345-
/O.CON.KFSD.TO.W.0049.000000T0000Z-100830T2345Z/
SANBORN SD-DAVISON SD-
616 PM CDT MON AUG 30 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN DAVISON AND
SOUTHERN SANBORN COUNTIES UNTIL 645 PM CDT...

AT 616 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR LOOMIS...OR 9 MILES NORTHWEST OF MITCHELL...
MOVING NORTHEAST AT 50 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  LETCHER AROUND 625 PM CDT...
  FORESTBURG AROUND 630 PM CDT...

IN ADDITION TO THE TORNADO..THIS STORM IS CAPABLE OF PRODUCING HALF 
DOLLAR SIZE HAIL AND WINDS EXCESS OF 70 MPH.

LAT...LON 4376 9812 4378 9832 4405 9829 4403 9792
TIME...MOT...LOC 2316Z 208DEG 43KT 4384 9816

$$

SCHUMACHER
502 
WWUS53 KFSD 302335
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
635 PM CDT MON AUG 30 2010

SDC035-111-302344-
/O.CAN.KFSD.TO.W.0049.000000T0000Z-100830T2345Z/
SANBORN SD-DAVISON SD-
635 PM CDT MON AUG 30 2010

...THE TORNADO WARNING FOR NORTHWESTERN DAVISON AND SOUTHERN SANBORN
COUNTIES IS CANCELLED...

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SANBORN 
COUNTY UNTIL 700 PM CDT...

THE STORM WHICH PROMPTED THE WARNING IS NO LONGER EXPECTED TO 
PRODUCE A TORNADO. HOWEVER...THIS STORM IS STILL CAPABLE OF 
PRODUCING QUARTER SIZE HAIL AND WINDS IN EXCESS OF 60 MPH.

LAT...LON 4376 9812 4378 9832 4405 9829 4403 9792
TIME...MOT...LOC 2334Z 208DEG 43KT 4403 9802

$$

SCHUMACHER

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 30, 5:09 PM CDTSevere Thunderstorm WarningFSDGregory36 min
Aug 30, 5:31 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Gregory29 min
Aug 30, 5:42 PM CDTSevere Thunderstorm WarningFSDGregory33 min
Aug 30, 5:57 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Douglas33 min
Aug 30, 6:06 PM CDTSevere Thunderstorm WarningFSDAurora, Davison, Sanborn24 min
Aug 30, 6:26 PM CDTSevere Thunderstorm WarningFSDSanborn34 min
Aug 30, 6:31 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory29 min
Aug 30, 6:36 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Davison, Douglas39 min
Aug 30, 6:44 PM CDTSevere Thunderstorm WarningFSDBeadle, Kingsbury, Miner, Sanborn46 min
Aug 30, 6:57 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson33 min

Nearby

Tornado Warnings in South Dakota, 2010Every tornado warning in 2010Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.