Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 101, NWS Sioux Falls, SD

May 30, 20114 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 30, 2011, 6:51 PM CDT for 4 counties in South Dakota. It was in force for 39 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 30, 2011, 6:51 PM CDT (23:51 UTC)
Expired: May 30, 2011, 7:30 PM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 23:53 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, 7:23 PM CDT	HAIL 0.75	5 Nw Farmer, 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 30, 2:08 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.9 hours before the alert went out and 137 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: 485 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 758 m²/s²
0-3 km storm-relative helicity: 711 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

513 
WUUS53 KFSD 302351
SVRFSD
SDC035-061-097-111-310030-
/O.NEW.KFSD.SV.W.0101.110530T2351Z-110531T0030Z/

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

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...
  SOUTHERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  SOUTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 730 PM CDT

* AT 651 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR DIMOCK...OR 18 MILES SOUTH OF MITCHELL...AND MOVING
  NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FULTON AND ALEXANDRIA AROUND 710 PM CDT...
  FARMER AROUND 715 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.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT MONDAY EVENING FOR
SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4385 9754 4385 9761 4373 9761 4350 9773
      4350 9810 4392 9796 4398 9747
TIME...MOT...LOC 2351Z 212DEG 43KT 4350 9797
WIND...HAIL 60MPH 1.25IN

$$

WEISSER

2 follow-up statements

473 
WWUS53 KFSD 310022
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
722 PM CDT MON MAY 30 2011

SDC035-061-097-111-310030-
/O.CON.KFSD.SV.W.0101.000000T0000Z-110531T0030Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
722 PM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
DAVISON...HANSON...SOUTHERN MINER AND SOUTHEASTERN SANBORN COUNTIES
UNTIL 730 PM CDT...

AT 722 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
FARMER...OR 14 MILES EAST OF MITCHELL...MOVING NORTHEAST AT 35 MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EASTERN
DAVISON...HANSON...SOUTHEASTERN SANBORN AND SOUTHERN MINER COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4385 9754 4385 9761 4373 9761 4350 9773
      4350 9810 4392 9796 4398 9747
TIME...MOT...LOC 0022Z 213DEG 30KT 4372 9774
WIND...HAIL 60MPH 1.25IN

$$

WEISSER

732 
WWUS53 KFSD 310031 RRA
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
731 PM CDT MON MAY 30 2011

SDC035-061-097-111-310041-
/O.EXP.KFSD.SV.W.0101.000000T0000Z-110531T0030Z/
SANBORN SD-MINER SD-HANSON SD-DAVISON SD-
731 PM CDT MON MAY 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DAVISON...HANSON...
SOUTHERN MINER AND SOUTHEASTERN SANBORN COUNTIES HAS EXPIRED...

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

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM CDT.

LAT...LON 4385 9754 4385 9761 4373 9761 4350 9773
      4350 9810 4392 9796 4398 9747
TIME...MOT...LOC 0022Z 213DEG 30KT 4372 9774

$$

CHAPMAN

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, 12:53 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Miner, Sanborn	37 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

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.