Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 81, NWS Sioux Falls, SD

May 5, 20127 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 5, 2012, 8:11 PM CDT for 7 counties in South Dakota. It was in force for 49 min. 6 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: May 5, 2012, 8:11 PM CDT (01:11 UTC)
Expired: May 5, 2012, 9:00 PM CDT
In force: 49 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 80.0 mph

Counties Davison County, SD, Hanson County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 68 km from the middle of the area, began a volume at 01:11 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
May 5, 8:24 PM CDT	HAIL 0.88	2 Sse Winfred, SD
May 5, 8:41 PM CDT	TSTM WND GST 80	3 W Orland, SD
May 5, 8:42 PM CDT	HAIL 1	4 E Winfred, SD	NICKEL TO QUARTER SIZED HAIL AND 45 MPH WINDS
May 5, 8:45 PM CDT	HAIL 1.75	2 W Madison, SD
May 5, 8:49 PM CDT	TSTM WND GST 75	1 W Madison, SD	THUNDERSTORM WIND GUSTS ESTIMATED AT 65 TO 75 MPH
May 5, 8:50 PM CDT	TSTM WND GST 60	2 N Salem, SD	SEMI OVERTURNED

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
May 5, 6:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.2 hours before the alert went out and 134 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: 657 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 278 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.

595 
WUUS53 KFSD 060111
SVRFSD
SDC035-061-079-087-097-099-111-060200-
/O.NEW.KFSD.SV.W.0081.120506T0111Z-120506T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
811 PM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  NORTHERN HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA...
  MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHWESTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA...
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 900 PM CDT

* AT 809 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING MULTIPLE SEVERE THUNDERSTORMS CAPABLE OF PRODUCING HALF
  DOLLAR SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.
  THESE STORMS WERE LOCATED 7 MILES EAST OF CANOVA...WITH A SECOND
  STORM NEAR FARMER...AND MOVING EAST AT 25 MPH. ADDITIONAL STORMS
  CONTINUE TO DEVELOP IN NORTHEAST DAVISON COUNTY...ALSO MOVING
  EAST-NORTHEAST AT 25 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SPENCER AROUND 820 PM CDT...
  LAKE HERMAN STATE PARK AND RAMONA AROUND 835 PM CDT...
  MADISON AND ORLAND AROUND 840 PM CDT...
  SALEM AROUND 845 PM CDT...
  CHESTER...WENTWORTH AND NUNDA AROUND 900 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.

THESE ARE SUPERCELL THUNDERSTORMS. DUE TO THE ROTATING NATURE OF 
THESE STORMS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE 
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE 
WINDS AND POSSIBLY TORNADOES. MOVE QUICKLY TO A SAFE SHELTER... 
PREFERABLY INTO AN INTERIOR ROOM...SUCH AS A BATHROOM OR A 
CLOSET...OR INTO A BASEMENT.

&&

LAT...LON 4373 9689 4366 9814 4376 9825 4402 9796
      4420 9717 4419 9689
TIME...MOT...LOC 0109Z 257DEG 22KT 4388 9735 4378 9772
WIND...HAIL 80MPH 1.25IN

$$

JH

2 follow-up statements

381 
WWUS53 KFSD 060134
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
834 PM CDT SAT MAY 5 2012

SDC035-111-060143-
/O.CAN.KFSD.SV.W.0081.000000T0000Z-120506T0200Z/
SANBORN SD-DAVISON SD-
834 PM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN DAVISON AND
SOUTHEASTERN SANBORN COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND NO 
LONGER APPEAR SEVERE. HOWEVER...HEAVY RAIN AND SMALL HAIL ARE STILL 
POSSIBLE. 

LAT...LON 4419 9689 4373 9689 4368 9789 4385 9787
      4385 9785 4405 9783 4420 9718
TIME...MOT...LOC 0133Z 259DEG 21KT 4390 9717 4383 9756
          4381 9773

$$

SDC061-079-087-097-099-060200-
/O.CON.KFSD.SV.W.0081.000000T0000Z-120506T0200Z/
MINNEHAHA SD-MINER SD-MCCOOK SD-LAKE SD-HANSON SD-
834 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
HANSON...LAKE...NORTHERN MCCOOK...MINER AND NORTHWESTERN MINNEHAHA
COUNTIES UNTIL 900 PM CDT...

AT 833 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
MULTIPLE SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE 
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.  THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM ORLAND TO 6 MILES SOUTHWEST OF 
CANOVA TO 6 MILES NORTHEAST OF FULTON...MOVING EAST-NORTHEAST AT 25 
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ORLAND AROUND 840 PM CDT...
  MADISON AROUND 845 PM CDT...
  SPENCER AROUND 850 PM CDT...
  WENTWORTH AND NUNDA AROUND 900 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.

THESE ARE SUPERCELL THUNDERSTORMS. DUE TO THE ROTATING NATURE OF 
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE 
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE 
WINDS AND POSSIBLY TORNADOES. BE PREPARED TO ACT QUICKLY SHOULD A 
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

&&

LAT...LON 4419 9689 4373 9689 4368 9789 4385 9787
      4385 9785 4405 9783 4420 9718
TIME...MOT...LOC 0133Z 259DEG 21KT 4390 9717 4383 9756
          4381 9773
WIND...HAIL 80MPH 1.75IN

$$

JH

738 
WWUS53 KFSD 060149
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
849 PM CDT SAT MAY 5 2012

SDC061-079-087-097-099-060200-
/O.CON.KFSD.SV.W.0081.000000T0000Z-120506T0200Z/
MINNEHAHA SD-MINER SD-MCCOOK SD-LAKE SD-HANSON SD-
849 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
HANSON...LAKE...NORTHERN MCCOOK...MINER AND NORTHWESTERN MINNEHAHA
COUNTIES UNTIL 900 PM CDT...

AT 847 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
MULTIPLE SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE 
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM MADISON...TO CANOVA...TO 7 MILES 
NORTH OF FARMER...MOVING EAST-NORTHEAST AT 25 MPH.

IN ADDITION...AT 841 PM CDT...80 MPH WINDS WERE REPORTED BY 
EMERGENCY MANAGEMENT NEAR 448TH AVENUE AND 241ST STREET IN LAKE 
COUNTY. AT 845 PM CDT...GOLF BALL SIZE HAIL WAS REPORTED ABOUT 1 
MILE WEST OF MADISON.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WENTWORTH AND NUNDA AROUND 855 PM CDT...
  ORLAND AROUND 900 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND POSSIBLY TORNADOES. BE PREPARED TO ACT QUICKLY SHOULD A
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

&&

LAT...LON 4419 9689 4373 9689 4369 9781 4407 9775
      4420 9718
TIME...MOT...LOC 0147Z 259DEG 21KT 4395 9705 4386 9746
          4383 9762
WIND...HAIL 80MPH 1.75IN

$$

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 7:05 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, McCook, Miner	25 min
May 5, 7:29 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Lake, McCook, Miner, Sanborn	46 min
May 5, 7:30 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Miner, Sanborn	45 min
May 5, 7:37 PM CDT	Flash Flood Warning	FSD	Davison, Hanson, Miner, Sanborn	7 hr
May 5, 7:41 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury	36 min
May 5, 7:59 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	46 min
May 5, 8:16 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury	29 min
May 5, 8:42 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury	48 min
May 5, 8:46 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix	44 min
May 5, 8:57 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Hanson, Lake, McCook, Miner, Minnehaha and 1 more	48 min
May 5, 9:05 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	25 min
May 5, 9:07 PM CDT	Flash Flood Warning	FSD	Lake, Miner	7 hr
May 5, 9:26 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury, Miner, Sanborn	23 min
May 5, 9:27 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	28 min
May 5, 9:29 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	46 min
May 5, 9:42 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody	48 min
May 5, 10:02 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury, Miner, Sanborn	28 min
May 5, 10:07 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	38 min
May 5, 10:15 PM CDT	Flash Flood Warning	FSD	Moody	4 hr
May 5, 10:28 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Minnehaha, Moody	62 min
May 5, 10:31 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Miner	29 min
May 5, 10:57 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake	33 min
May 5, 11:08 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Miner	37 min
May 5, 11:25 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Moody	65 min
May 5, 11:45 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha	45 min
May 6, 12:22 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody	38 min
May 6, 1:08 AM CDT	Areal Flood Warning	FSD	Brookings, Hanson, Kingsbury, Lake, McCook, Miner and 2 more	33 hr
May 6, 4:08 AM CDT	River Flood Warning	FSD	Moody	23 hr
May 6, 4:45 AM CDT	River Flood Warning	FSD	Brookings, Moody	29 hr
May 6, 4:45 AM CDT	River Flood Warning	FSD	Minnehaha, Moody	3 days
May 6, 4:45 AM CDT	River Flood Warning	FSD	Minnehaha	4 days
May 6, 4:45 AM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	4 days
May 6, 4:45 AM CDT	River Flood Warning	FSD	Lincoln, Union	7 days
May 6, 4:45 AM CDT	River Flood Warning	FSD	Union	7 days
May 6, 8:24 AM CDT	River Flood Warning	FSD	McCook	4 days
May 6, 10:31 AM CDT	River Flood Warning	FSD	Davison, Hanson	7 days
May 6, 10:31 AM CDT	River Flood Warning	FSD	Hutchinson, Yankton	5 days
May 6, 10:31 AM CDT	River Flood Warning	FSD	Yankton	44 hr
May 6, 10:31 AM CDT	River Flood Warning	FSD	Turner	71 hr
May 6, 10:31 AM CDT	River Flood Warning	FSD	Turner	5 days
May 6, 10:31 AM CDT	River Flood Warning	FSD	Clay	7 days
May 6, 6:58 PM CDT	River Flood Warning	FSD	Minnehaha	3 days

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.