Alert archive / South Dakota / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 252, NWS Sioux Falls, SD

August 30, 2010Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 30, 2010, 5:42 PM CDT for Gregory County, South Dakota. It was in force for 33 min. 2 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, 5:42 PM CDT (22:42 UTC)
Expired: Aug 30, 2010, 6:15 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Gregory County, SD

The radar

The North Platte radar (KLNX), 187 km from the middle of the area, began a volume at 22:45 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

Time	Report	Where	Remark
Aug 30, 5:46 PM CDT	HAIL 1	Sw Herrick, SD	TIN ALSO BLOWN OFF HOUSE AND HAY BALE BLOWN ACROSS ROAD.
Aug 30, 5:48 PM CDT	TSTM WND DMG	Sse Herrick, SD	4-5 INCH DIAMETER BRANCHES DOWN

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.

Issued	Product	Office	Lasted
Aug 30, 3:23 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.7 hours before the alert went out and 194 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: 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.

388 
WUUS53 KFSD 302242
SVRFSD
SDC053-302315-
/O.NEW.KFSD.SV.W.0252.100830T2242Z-100830T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
542 PM CDT MON AUG 30 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREGORY COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...

* UNTIL 615 PM CDT

* AT 541 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. 
  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM BURKE TO 9
  MILES NORTHEAST OF HERRICK TO BONESTEEL...AND MOVING NORTHEAST AT
  50 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT...
  BURKE THROUGH 550 PM CDT...
  HERRICK THROUGH 550 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4343 9920 4336 9910 4332 9906 4327 9899
      4324 9889 4318 9887 4315 9884 4298 9898
      4299 9928 4309 9945
TIME...MOT...LOC 2241Z 212DEG 42KT 4320 9925 4323 9909
          4307 9901
WIND...HAIL 70MPH 1.00IN

$$

SCHUMACHER

2 follow-up statements

506 
WWUS53 KFSD 302256
SVSFSD

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

SDC053-302315-
/O.CON.KFSD.SV.W.0252.000000T0000Z-100830T2315Z/
GREGORY SD-
556 PM CDT MON AUG 30 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
GREGORY COUNTY UNTIL 615 PM CDT...

AT 556 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 14 MILES NORTHEAST OF BURKE TO 9
MILES WEST OF PLATTE TO 7 MILES NORTHWEST OF BONESTEEL...MOVING
NORTHEAST AT 50 MPH.

THESE STORMS WILL BE IN THE VICINITY OF THE MISSOURI RIVER THROUGH 6 
PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4343 9920 4336 9910 4331 9906 4327 9899
      4324 9889 4319 9887 4315 9884 4302 9898
      4310 9918 4323 9934
TIME...MOT...LOC 2256Z 213DEG 45KT 4338 9913 4336 9899
          4319 9900
WIND...HAIL 70MPH 1.00IN

$$

SCHUMACHER

236 
WWUS53 KFSD 302312
SVSFSD

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

SDC053-302322-
/O.EXP.KFSD.SV.W.0252.000000T0000Z-100830T2315Z/
GREGORY SD-
612 PM CDT MON AUG 30 2010

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL GREGORY COUNTY WILL
EXPIRE AT 615 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.

LAT...LON 4343 9920 4336 9910 4331 9906 4327 9899
      4324 9889 4319 9887 4315 9884 4302 9898
      4310 9918 4323 9934
TIME...MOT...LOC 2312Z 213DEG 45KT 4355 9898 4353 9884
          4336 9885

$$

SCHUMACHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:09 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	36 min
Aug 30, 5:31 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Gregory	29 min
Aug 30, 5:57 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas	33 min
Aug 30, 6:06 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Sanborn	24 min
Aug 30, 6:11 PM CDT	Tornado Warning	FSD	Davison, Sanborn	24 min
Aug 30, 6:26 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	34 min
Aug 30, 6:31 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	29 min
Aug 30, 6:36 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Davison, Douglas	39 min
Aug 30, 6:44 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	46 min
Aug 30, 6:57 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	33 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2010 Every severe thunderstorm warning 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.