Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 4, NWS Aberdeen, SD

May 8, 2011Lyman County, South Dakota

NWS Aberdeen, SD issued this tornado warning at May 8, 2011, 8:08 PM CDT for Lyman County, South Dakota. It was in force for 14 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 8, 2011, 8:08 PM CDT (01:08 UTC)
Expired: May 8, 2011, 8:22 PM CDT
In force: 14 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon

County Lyman County, SD

The radar

The Aberdeen radar (KABR), 214 km from the middle of the area, began a volume at 01:09 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 8, 8:10 PM CDT	HAIL 1	7 S Presho, 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 8, 6:13 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.1 hours before the alert went out and 169 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: 1839 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 413 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

734 
WFUS53 KABR 090108
TORABR
SDC085-090145-
/O.NEW.KABR.TO.W.0004.110509T0108Z-110509T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
808 PM CDT SUN MAY 8 2011

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL LYMAN COUNTY IN CENTRAL SOUTH DAKOTA...

* UNTIL 845 PM CDT

* AT 805 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 8 
MILES SOUTHWEST OF PRESHO. DOPPLER RADAR SHOWED THIS TORNADO MOVING 
NORTHEAST AT 15 MPH.

* THE TORNADO WILL BE NEAR...
  PRESHO AROUND 815 PM CDT...

THIS WARNING INCLUDES INTERSTATE 90 BETWEEN MILE MARKERS 221 AND 240.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4403 10002 4386 9974 4372 10004 4385 10021
TIME...MOT...LOC 0107Z 226DEG 11KT 4385 10004

$$
CONNELLY

1 follow-up statement

426 
WWUS53 KABR 090122
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
822 PM CDT SUN MAY 8 2011

SDC085-090131-
/O.CAN.KABR.TO.W.0004.000000T0000Z-110509T0145Z/
LYMAN SD-
822 PM CDT SUN MAY 8 2011

...THE TORNADO WARNING FOR CENTRAL LYMAN COUNTY IS CANCELLED...

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT MONDAY MORNING FOR
NORTH CENTRAL SOUTH DAKOTA.

LAT...LON 4403 10002 4386 9974 4372 10004 4385 10021
TIME...MOT...LOC 0121Z 226DEG 11KT 4388 10000

$$
CONNELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 8:43 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	47 min
May 8, 9:00 PM CDT	Tornado Warning	ABR	Lyman	35 min
May 8, 11:53 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day	37 min
May 9, 12:26 AM CDT	Severe Thunderstorm Warning	ABR	Day, Grant, Roberts	36 min
May 9, 1:05 AM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	40 min
May 9, 3:05 AM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	25 min

Nearby

Tornado Warnings in South Dakota, 2011 Every tornado warning in 2011 Tornadoes 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.