Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 57, NWS Sioux Falls, SD

May 5, 2012Aurora County, Brule County, Jerauld County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 5, 2012, 8:23 AM CDT for Aurora County, Brule County, Jerauld County, South Dakota. It was in force for 37 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: May 5, 2012, 8:23 AM CDT (13:23 UTC)
Expired: May 5, 2012, 9:00 AM CDT
In force: 37 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 58.0 mph

Counties Aurora County, SD, Brule County, SD, Jerauld County, SD

The radar

The Sioux Falls radar (KFSD), 175 km from the middle of the area, began a volume at 13:24 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, 8:40 AM CDT	HAIL 1	4 N White Lake, SD	PEA TO QUARTER SIZE HAIL COVERING THE ROAD

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, 6:49 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 1.4 hours before the alert went out and 121 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: 554 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 60 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.

175 
WUUS53 KFSD 051323
SVRFSD
SDC003-015-073-051400-
/O.NEW.KFSD.SV.W.0057.120505T1323Z-120505T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
823 AM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN AURORA COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  EASTERN BRULE COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  SOUTHWESTERN JERAULD COUNTY IN CENTRAL SOUTH DAKOTA...

* UNTIL 900 AM CDT

* AT 824 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WALNUT
  SIZE HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  SHELBY TO KIMBALL TO 10 MILES SOUTHWEST OF GRASS RANCH COLONY...AND
  MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  GRASS RANCH COLONY AROUND 830 AM CDT...
  WHITE LAKE AROUND 840 AM 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 4394 9894 4403 9893 4410 9860 4355 9848
      4355 9906 4394 9918
TIME...MOT...LOC 1324Z 259DEG 39KT 4394 9907 4380 9896
          4359 9898
WIND...HAIL <58MPH 1.50IN

$$

CJ

2 follow-up statements

988 
WWUS53 KFSD 051334
SVSFSD

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

SDC003-015-073-051400-
/O.CON.KFSD.SV.W.0057.000000T0000Z-120505T1400Z/
JERAULD SD-BRULE SD-AURORA SD-
834 AM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
AURORA...EASTERN BRULE AND SOUTHWESTERN JERAULD COUNTIES UNTIL 900 AM
CDT...

AT 834 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WALNUT SIZE HAIL.
 THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES SOUTH
OF GANN VALLEY TO 6 MILES NORTHEAST OF KIMBALL TO GRASS RANCH
COLONY...MOVING EAST AT 45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WHITE LAKE AROUND 840 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4357 9892 4381 9892 4394 9902 4394 9894
      4403 9893 4410 9860 4355 9848
TIME...MOT...LOC 1334Z 259DEG 39KT 4396 9892 4382 9881
          4361 9883
WIND...HAIL <58MPH 1.50IN

$$

CJ

032 
WWUS53 KFSD 051344
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
844 AM CDT SAT MAY 5 2012

SDC015-051354-
/O.CAN.KFSD.SV.W.0057.000000T0000Z-120505T1400Z/
BRULE SD-
844 AM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BRULE COUNTY IS
CANCELLED...

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

LAT...LON 4358 9876 4381 9878 4389 9880 4395 9880
      4403 9885 4410 9860 4355 9848
TIME...MOT...LOC 1344Z 259DEG 39KT 4398 9873 4384 9866
          4363 9868

$$

SDC003-073-051400-
/O.CON.KFSD.SV.W.0057.000000T0000Z-120505T1400Z/
JERAULD SD-AURORA SD-
844 AM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN AURORA
AND SOUTH CENTRAL JERAULD COUNTIES UNTIL 900 AM CDT...

AT 844 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 12 MILES
SOUTHWEST OF WESSINGTON SPRINGS TO 7 MILES NORTH OF WHITE LAKE TO 7
MILES SOUTH OF WHITE LAKE...MOVING EAST AT 45 MPH.

THIS LINE OF SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF
SOUTH CENTRAL JERAULD AND WESTERN AURORA COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4358 9876 4381 9878 4389 9880 4395 9880
      4403 9885 4410 9860 4355 9848
TIME...MOT...LOC 1344Z 259DEG 39KT 4398 9873 4384 9866
          4363 9868
WIND...HAIL <58MPH 1.00IN

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 6:37 AM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	23 min
May 5, 6:53 AM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	37 min
May 5, 7:24 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	36 min
May 5, 7:50 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	40 min
May 5, 8:03 AM CDT	Severe Thunderstorm Warning	FSD	Brule	27 min
May 5, 8:16 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison	29 min
May 5, 8:40 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson	35 min
May 5, 8:52 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Sanborn	23 min
May 5, 9:08 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Miner	37 min
May 5, 9:11 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson	34 min
May 5, 9:35 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha	25 min
May 5, 9:40 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook, Miner	35 min
May 5, 9:53 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody	37 min
May 5, 10:11 AM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	34 min
May 5, 10:25 AM CDT	Severe Thunderstorm Warning	FSD	Moody	35 min
May 5, 10:30 AM CDT	Flash Flood Warning	FSD	Lake, Moody	3 hr
May 5, 10:36 AM CDT	Severe Thunderstorm Warning	FSD	Beadle	24 min
May 5, 10:42 AM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	48 min
May 5, 12:18 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury	27 min
May 5, 12:40 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	23 min
May 5, 3:06 PM CDT	Flash Flood Watch	FSD	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	13 hr
May 5, 6:20 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Sanborn	25 min
May 5, 6:40 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Miner, Sanborn	50 min
May 5, 6:51 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Davison, Kingsbury, Miner, Sanborn	39 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.