Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 210, NWS Sioux Falls, SD

September 4, 2012Davison County, Hanson County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 4, 2012, 7:59 PM CDT for Davison County, Hanson County, South Dakota. It was in force for 31 min. 1 report 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: Sep 4, 2012, 7:59 PM CDT (00:59 UTC)
Expired: Sep 4, 2012, 8:30 PM CDT
In force: 31 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Davison County, SD, Hanson County, SD

The radar

The Sioux Falls radar (KFSD), 91 km from the middle of the area, began a volume at 01:02 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
Sep 4, 8:00 PM CDT	TSTM WND GST 60	3 Sse Mitchell, SD	ESTIMATED 40 TO 60 MPH WINDS.

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
Sep 4, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.0 hours before the alert went out and 133 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3353 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

830 
WUUS53 KFSD 050059
SVRFSD
SDC035-061-050130-
/O.NEW.KFSD.SV.W.0210.120905T0059Z-120905T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
759 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA...

* UNTIL 830 PM CDT

* AT 800 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR MITCHELL...AND MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FULTON AROUND 810 PM CDT...
  ALEXANDRIA AROUND 815 PM CDT...
  FARMER AROUND 820 PM CDT...
  EMERY AROUND 825 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4385 9787 4385 9761 4379 9761 4359 9762
      4354 9810 4385 9812 4385 9788
TIME...MOT...LOC 0100Z 263DEG 35KT 4370 9798
WIND...HAIL 60MPH 1.00IN

$$

MJF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 7:13 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson, Sanborn	47 min
Sep 4, 7:37 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Jerauld	38 min
Sep 4, 7:49 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Miner	41 min
Sep 4, 8:14 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union	46 min
Sep 4, 8:27 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook, Miner	33 min
Sep 4, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Lincoln, McCook, Minnehaha, Moody, Turner	38 min
Sep 4, 8:57 PM CDT	Severe Thunderstorm Warning	FSD	Union	48 min
Sep 4, 9:28 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	47 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2012 Every severe thunderstorm warning in 2012

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.