Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 91, NWS Sioux Falls, SD

May 30, 20114 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 30, 2011, 12:53 AM CDT for 4 counties in South Dakota. It was in force for 37 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: May 30, 2011, 12:53 AM CDT (05:53 UTC)
Expired: May 30, 2011, 1:30 AM CDT
In force: 37 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 58.0 mph

Counties Davison County, SD, Hanson County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 97 km from the middle of the area, began a volume at 05:57 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 30, 1:08 AM CDT	HAIL 1	Mitchell, SD
May 30, 1:13 AM CDT	HAIL 0.88	Mitchell, 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 29, 10:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.9 hours before the alert went out and 141 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: 1349 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 561 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.

261 
WUUS53 KFSD 300553
SVRFSD
SDC035-061-097-111-300630-
/O.NEW.KFSD.SV.W.0091.110530T0553Z-110530T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1253 AM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN DAVISON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  NORTHERN HANSON COUNTY IN SOUTHEAST SOUTH DAKOTA...
  SOUTHWESTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 130 AM CDT

* AT 1253 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
  SIZE HAIL.  THIS STORM WAS LOCATED 5 MILES WEST OF ETHAN...OR 13
  MILES SOUTH OF MITCHELL...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MITCHELL AROUND 110 AM CDT...
  FULTON AROUND 120 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 4381 9762 4350 9798 4350 9821 4353 9826
      4394 9787
TIME...MOT...LOC 0553Z 217DEG 36KT 4355 9808
WIND...HAIL <58MPH 1.25IN

$$

BT

4 follow-up statements

749 
WWUS53 KFSD 300605
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
105 AM CDT MON MAY 30 2011

SDC035-061-097-111-300630-
/O.CON.KFSD.SV.W.0091.000000T0000Z-110530T0630Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
105 AM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
DAVISON...NORTHERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN
SANBORN COUNTIES UNTIL 130 AM CDT...

AT 105 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. 
THIS STORM WAS LOCATED 7 MILES NORTHWEST OF ETHAN...OR 7 MILES SOUTH
OF MITCHELL...MOVING NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MITCHELL AROUND 110 AM CDT...
  FULTON AROUND 120 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 4381 9762 4350 9798 4350 9821 4353 9826
      4394 9787
TIME...MOT...LOC 0605Z 217DEG 36KT 4366 9801
WIND...HAIL <58MPH 1.25IN

$$

BT

968 
WWUS53 KFSD 300616
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
116 AM CDT MON MAY 30 2011

SDC035-061-097-111-300630-
/O.CON.KFSD.SV.W.0091.000000T0000Z-110530T0630Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
116 AM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
DAVISON...NORTHERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN
SANBORN COUNTIES UNTIL 130 AM CDT...

AT 116 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR MITCHELL...MOVING NORTHEAST AT 40 MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN DAVISON...NORTHERN HANSON...SOUTHEASTERN SANBORN AND
SOUTHWESTERN MINER COUNTIES.

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 4360 9787 4362 9801 4370 9810 4394 9787
      4381 9762
TIME...MOT...LOC 0616Z 217DEG 36KT 4375 9792
WIND...HAIL <58MPH 1.00IN

$$

BT

699 
WWUS53 KFSD 300620
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
120 AM CDT MON MAY 30 2011

SDC035-061-097-111-300630-
/O.CON.KFSD.SV.W.0091.000000T0000Z-110530T0630Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
120 AM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
DAVISON...NORTHERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN
SANBORN COUNTIES UNTIL 130 AM CDT...

AT 120 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED 5 MILES WEST OF FULTON...OR 5 MILES EAST OF
MITCHELL...MOVING NORTHEAST AT 40 MPH.

AT 108 AM...BROADCAST MEDIA REPORTED QUARTER SIZE HAIL IN MITCHELL. 

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 4360 9787 4366 9796 4378 9802 4394 9787
      4381 9762
TIME...MOT...LOC 0620Z 217DEG 36KT 4378 9788
WIND...HAIL <58MPH 1.00IN

$$

BT

862 
WWUS53 KFSD 300626
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
126 AM CDT MON MAY 30 2011

SDC035-061-097-111-300636-
/O.EXP.KFSD.SV.W.0091.000000T0000Z-110530T0630Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
126 AM CDT MON MAY 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DAVISON...
NORTHERN HANSON...SOUTHWESTERN MINER AND SOUTHEASTERN SANBORN
COUNTIES WILL EXPIRE AT 130 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY...HOWEVER SMALL HAIL AND BRIEF HEAVY RAIN IS STILL POSSIBLE 
WITH THIS THUNDERSTORM.

LAT...LON 4360 9787 4366 9796 4378 9802 4394 9787
      4381 9762
TIME...MOT...LOC 0626Z 217DEG 36KT 4383 9783

$$

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 11:03 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	42 min
May 29, 11:30 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	45 min
May 29, 11:39 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Gregory, Hutchinson, Turner and 1 more	36 min
May 30, 12:14 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson, Turner, Yankton	31 min
May 30, 1:46 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	44 min
May 30, 2:39 AM CDT	Severe Thunderstorm Warning	FSD	Beadle	36 min
May 30, 3:36 AM CDT	Severe Thunderstorm Warning	FSD	Brookings	39 min
May 30, 9:28 AM CDT	River Flood Warning	FSD	Minnehaha	71 hr
May 30, 5:08 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	37 min
May 30, 5:37 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld	23 min
May 30, 5:48 PM CDT	Tornado Warning	FSD	Bon Homme, Charles Mix	42 min
May 30, 6:26 PM CDT	Tornado Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	34 min
May 30, 6:33 PM CDT	Tornado Warning	FSD	Beadle	27 min
May 30, 6:38 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	52 min
May 30, 6:51 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Miner, Sanborn	39 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011 Every severe thunderstorm warning in 2011

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.