Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Sioux Falls, SD

May 5, 20126 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 5, 2012, 7:29 PM CDT for 6 counties in South Dakota. It was in force for 46 min. 4 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, 7:29 PM CDT (00:29 UTC)
Expired: May 5, 2012, 8:15 PM CDT
In force: 46 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, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 88 km from the middle of the area, began a volume at 00:29 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, 7:47 PM CDT	HAIL 1.75	6 Ne Mitchell, SD
May 5, 7:52 PM CDT	HAIL 1	9 S Fedora, SD
May 5, 8:00 PM CDT	HAIL 1	8 Nne Mitchell, SD	IN ADDITION TO QUARTER SIZED HAIL, THERE HAVE BEEN WAVES OF HEAVY RAIN COMING THROUGH, THE POWER HAS BEEN KNOCKED OUT SINCE 735 PM, AND THE BASEMENT IS GETTING FLOODED.
May 5, 8:24 PM CDT	HAIL 0.88	2 Sse Winfred, 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.

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, 0.5 hours before the alert went out and 126 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.

705 
WUUS53 KFSD 060029
SVRFSD
SDC035-061-079-087-097-111-060115-
/O.NEW.KFSD.SV.W.0077.120506T0029Z-120506T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
729 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...
  WESTERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA...
  SOUTHERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 815 PM CDT

* AT 724 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.
  THE FIRST OF THESE STORMS WAS LOCATED 6 MILES NORTHEAST OF
  FULTON...WITH THE SECOND STORM NEAR MITCHELL. THESE STORMS ARE
  MOVING NORTHEAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SPENCER AROUND 735 PM CDT...
  CANOVA AND SALEM AROUND 755 PM CDT...
  FEDORA AROUND 805 PM CDT...
  WINFRED...ORLAND...HOWARD AND VILAS AROUND 815 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.

THIS IS A SUPERCELL THUNDERSTORM. 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 4419 9716 4375 9717 4364 9812 4366 9833
      4368 9833 4398 9800
TIME...MOT...LOC 0024Z 247DEG 25KT 4381 9774 4372 9807
WIND...HAIL 80MPH 1.25IN

$$

JH

1 follow-up statement

436 
WWUS53 KFSD 060059
SVSFSD

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

SDC035-061-079-087-097-111-060115-
/O.CON.KFSD.SV.W.0077.000000T0000Z-120506T0115Z/
SANBORN SD-MINER SD-MCCOOK SD-LAKE SD-HANSON SD-DAVISON SD-
759 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
DAVISON...NORTHERN HANSON...WESTERN LAKE...NORTHERN MCCOOK...SOUTHERN
MINER AND SOUTHEASTERN SANBORN COUNTIES UNTIL 815 PM CDT...

AT 756 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 NEAR CANOVA...AND ABOUT 5 MILES NORTH OF FULTON...MOVING 
EAST-NORTHEAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  FEDORA AROUND 810 PM CDT...
  CANOVA...ORLAND AND WINFRED AROUND 815 PM CDT...

AT 747 PM CDT...GOLF BALL SIZE HAIL WAS REPORTED IN FAR NORTHWEST 
HANSON COUNTY...ABOUT 6 MILES NORTHEAST OF MITCHELL. AT 752 PM 
CDT...QUARTER SIZE HAIL WAS REPORTED 9 MILES SOUTH OF FEDORA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 9716 4375 9717 4364 9812 4366 9833
      4368 9833 4398 9800
TIME...MOT...LOC 0056Z 251DEG 21KT 4385 9746 4378 9780
WIND...HAIL 80MPH 1.25IN

$$

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, 7:30 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, 8:11 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Lake, McCook, Miner, Minnehaha and 1 more	49 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.