Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 138, NWS Sioux Falls, SD

June 13, 2012Jerauld County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 13, 2012, 6:22 PM CDT for Jerauld County, South Dakota. It was in force for 23 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: Jun 13, 2012, 6:22 PM CDT (23:22 UTC)
Expired: Jun 13, 2012, 6:45 PM CDT
In force: 23 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Jerauld County, SD

The radar

The Aberdeen radar (KABR), 151 km from the middle of the area, began a volume at 23:25 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
Jun 13, 6:30 PM CDT	HAIL 1.75	19 Wnw Wessington Sprin, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.4 hours before the alert went out and 93 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: 12 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 104 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.

741 
WUUS53 KFSD 132322
SVRFSD
SDC073-132345-
/O.NEW.KFSD.SV.W.0138.120613T2322Z-120613T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
622 PM CDT WED JUN 13 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN JERAULD COUNTY IN CENTRAL SOUTH DAKOTA...

* UNTIL 645 PM CDT

* AT 622 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 8 MILES NORTH OF GANN VALLEY...OR 21 MILES EAST OF FORT
  THOMPSON...AND MOVING NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
  NORTHWESTERN JERAULD COUNTY.

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 4406 9893 4406 9894 4418 9894 4419 9893
      4420 9892 4420 9878 4420 9877
TIME...MOT...LOC 2322Z 210DEG 30KT 4416 9899
WIND...HAIL 60MPH 1.25IN

$$
CHAPMAN

2 follow-up statements

949 
WWUS53 KFSD 132337
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
637 PM CDT WED JUN 13 2012

SDC073-132345-
/O.CON.KFSD.SV.W.0138.000000T0000Z-120613T2345Z/
JERAULD SD-
637 PM CDT WED JUN 13 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
JERAULD COUNTY UNTIL 645 PM CDT...

AT 637 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 SOUTH
OF DANFORTH...OR 23 MILES SOUTH OF MILLER...MOVING NORTHEAST AT 30 
MPH.

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 4406 9893 4406 9894 4418 9894 4419 9893
      4420 9892 4420 9878 4420 9877
TIME...MOT...LOC 2337Z 220DEG 27KT 4422 9887
WIND...HAIL 60MPH 1.25IN

$$
CHAPMAN

965 
WWUS53 KFSD 132350
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
650 PM CDT WED JUN 13 2012

SDC073-140000-
/O.EXP.KFSD.SV.W.0138.000000T0000Z-120613T2345Z/
JERAULD SD-
650 PM CDT WED JUN 13 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN JERAULD COUNTY
HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA...HOWEVER SMALL HAIL AND WIND GUSTS TO AROUND 50 MPH ARE STILL 
POSSIBLE WITH ANOTHER THUNDERSTORM DEVELOPING ACROSS THE NORTHWEST 
PORTION OF THE COUNTY.

LAT...LON 4406 9893 4406 9894 4418 9894 4419 9893
      4420 9892 4420 9878 4420 9877
TIME...MOT...LOC 2337Z 220DEG 27KT 4422 9887

$$

CHAPMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 5:56 PM CDT	Severe Thunderstorm Warning	FSD	Brule	49 min
Jun 13, 6:47 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	43 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.