Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 98, NWS Sioux Falls, SD

May 30, 2011Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 30, 2011, 5:08 PM CDT for Gregory County, South Dakota. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 30, 2011, 5:08 PM CDT (22:08 UTC)
Expired
May 30, 2011, 5:45 PM CDT
In force
37 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 185 km from the middle of the area, began a volume at 22:12 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 30, 2:08 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.1 hours before the alert went out and 200 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2011-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2011-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 758 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

471 
WUUS53 KFSD 302208
SVRFSD
SDC053-302245-
/O.NEW.KFSD.SV.W.0098.110530T2208Z-110530T2245Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GREGORY COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...

* UNTIL 545 PM CDT

* AT 507 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR NAPER...OR 19 MILES WEST OF SPENCER...AND MOVING
  NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BONESTEEL AROUND 515 PM CDT...
  FAIRFAX AROUND 515 PM CDT...

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE FAIRFAX.

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.

&&

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

LAT...LON 4330 9904 4319 9887 4317 9888 4315 9882
      4308 9872 4299 9890 4299 9918
TIME...MOT...LOC 2207Z 206DEG 39KT 4301 9903
WIND...HAIL 60MPH 1.00IN

$$

WEISSER
2 follow-up statements
008 
WWUS53 KFSD 302221
SVSFSD

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

SDC053-302245-
/O.CON.KFSD.SV.W.0098.000000T0000Z-110530T2245Z/
GREGORY SD-
521 PM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
GREGORY COUNTY UNTIL 545 PM CDT...

AT 521 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
BONESTEEL...OR 22 MILES WEST OF LAKE ANDES...MOVING NORTHEAST AT 45
MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
SOUTHEASTERN GREGORY COUNTY.

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 4330 9904 4319 9887 4317 9888 4315 9882
      4308 9872 4299 9890 4299 9918
TIME...MOT...LOC 2221Z 203DEG 38KT 4314 9897
WIND...HAIL 60MPH 1.00IN

$$

WEISSER
818 
WWUS53 KFSD 302240
SVSFSD

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

SDC053-302250-
/O.EXP.KFSD.SV.W.0098.000000T0000Z-110530T2245Z/
GREGORY SD-
540 PM CDT MON MAY 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GREGORY COUNTY
WILL EXPIRE AT 545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM CDT.

LAT...LON 4330 9904 4319 9887 4317 9888 4315 9882
      4308 9872 4299 9890 4299 9918
TIME...MOT...LOC 2240Z 203DEG 38KT 4332 9886

$$

WEISSER

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 11:03 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix42 min
May 29, 11:30 PM CDTSevere Thunderstorm WarningFSDHutchinson, Turner45 min
May 29, 11:39 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Gregory, Hutchinson, Turner and 1 more36 min
May 30, 12:14 AM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson, Turner, Yankton31 min
May 30, 12:53 AM CDTSevere Thunderstorm WarningFSDDavison, Hanson, Miner, Sanborn37 min
May 30, 1:46 AM CDTSevere Thunderstorm WarningFSDBeadle, Jerauld44 min
May 30, 2:39 AM CDTSevere Thunderstorm WarningFSDBeadle36 min
May 30, 3:36 AM CDTSevere Thunderstorm WarningFSDBrookings39 min
May 30, 9:28 AM CDTRiver Flood WarningFSDMinnehaha71 hr
May 30, 5:37 PM CDTSevere Thunderstorm WarningFSDJerauld23 min
May 30, 5:48 PM CDTTornado WarningFSDBon Homme, Charles Mix42 min
May 30, 6:26 PM CDTTornado WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson34 min
May 30, 6:33 PM CDTTornado WarningFSDBeadle27 min
May 30, 6:38 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory52 min
May 30, 6:51 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson, Miner, Sanborn39 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.