Alert archive / South Dakota / Tornado Warnings in 2009

Tornado Warning 20, NWS Aberdeen, SD

June 18, 2009Campbell County, McPherson County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jun 18, 2009, 2:47 PM CDT for Campbell County, McPherson County, South Dakota. It was in force for 43 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 18, 2009, 2:47 PM CDT (19:47 UTC)
Expired: Jun 18, 2009, 3:30 PM CDT
In force: 43 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon

Counties Campbell County, SD, McPherson County, SD

The radar

The Aberdeen radar (KABR), 99 km from the middle of the area, began a volume at 19:49 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 18, 3:12 PM CDT	TSTM WND GST 60	1 Ne Eureka, SD	NORTHWEST WIND, HEAVY RAIN, PEA SIZED HAIL.

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

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 18, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.8 hours before the alert went out and 136 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: 1167 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 52 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.

000 
WFUS53 KABR 181947
TORABR
SDC021-089-182030-
/O.NEW.KABR.TO.W.0020.090618T1947Z-090618T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
247 PM CDT THU JUN 18 2009

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL CAMPBELL COUNTY IN NORTH CENTRAL SOUTH DAKOTA...
  NORTHWESTERN MCPHERSON COUNTY IN NORTH CENTRAL SOUTH DAKOTA...

* UNTIL 330 PM CDT

* AT 246 PM CDT...DOPPLER RADAR INDICATED A TORNADO. THIS TORNADO WAS
  LOCATED 4 MILES SOUTH OF ARTAS...MOVING EAST AT 25 MPH.

* THIS TORNADO WILL BE NEAR...
  EUREKA AROUND 300 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

&&

LAT...LON 4572 9942 4576 9981 4588 9986 4595 9947
      4595 9944
TIME...MOT...LOC 1947Z 246DEG 21KT 4583 9976

$$
MOHR

2 follow-up statements

000 
WWUS53 KABR 182007
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
307 PM CDT THU JUN 18 2009

SDC021-182017-
/O.CAN.KABR.TO.W.0020.000000T0000Z-090618T2030Z/
CAMPBELL SD-
307 PM CDT THU JUN 18 2009

...THE TORNADO WARNING FOR EAST CENTRAL CAMPBELL COUNTY HAS BEEN
CANCELLED...

SEVERE WEATHER HAD EITHER WEAKENED OR MOVED OUT OF THE WARNED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH
DAKOTA.

LAT...LON 4572 9942 4576 9971 4590 9971 4595 9947
      4595 9944
TIME...MOT...LOC 2007Z 264DEG 17KT 4585 9954

$$

SDC089-182030-
/O.CON.KABR.TO.W.0020.000000T0000Z-090618T2030Z/
MCPHERSON SD-
307 PM CDT THU JUN 18 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR
NORTHWESTERN MCPHERSON COUNTY...

AT 304 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS
TORNADO WAS LOCATED 6 MILES NORTHEAST OF EUREKA...MOVING EAST AT 20
MPH.

THIS TORNADO WILL BE NEAR...
  RURAL MCPHERSON COUNTY AT 320 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH
DAKOTA.

&&

LAT...LON 4572 9942 4576 9971 4590 9971 4595 9947
      4595 9944
TIME...MOT...LOC 2007Z 264DEG 17KT 4585 9954

$$
HINTZ

000 
WWUS53 KABR 182028
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
328 PM CDT THU JUN 18 2009

SDC089-182038-
/O.EXP.KABR.TO.W.0020.000000T0000Z-090618T2030Z/
MCPHERSON SD-
328 PM CDT THU JUN 18 2009

...THE TORNADO WARNING FOR NORTHWESTERN MCPHERSON COUNTY WILL EXPIRE
AT 330 PM CDT/230 PM MDT/...

THE TORNADO THREAT HAS DIMINISHED OVER THE WARNED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH
DAKOTA.

LAT...LON 4572 9942 4576 9971 4590 9971 4595 9947
      4595 9944
TIME...MOT...LOC 2028Z 264DEG 17KT 4586 9940

$$
HINTZ

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this tornado warning went out at Jun 18, 4:24 AM CDT, 10 hours 23 minutes earlier.

Area forecast discussion, Jun 18, 4:24 AM CDT, 10 hours 23 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
424 AM CDT THU JUN 18 2009

.SHORT TERM...TODAY THROUGH SATURDAY
THUNDERSTORM CHANCES TODAY THROUGH TONIGHT....ALONG WITH THE
POSSIBILITY FOR SEVERE THUNDERSTORMS ARE THE FORECAST CHALLENGES.

A WARM FRONT...CURRENTLY SITUATED ACROSS SOUTHERN NEBRASKA...IS
EXPECTED TO LIFT NORTHEAST THIS AFTERNOON. BOUNDARY LAYER DEW
POINT INCREASE TO NEAR 70 DEGREES LATER THIS AFTERNOON...MAINLY IN
THE EXTREME SOUTHEASTERN CWA. IN THIS LOCATION...ML CAPE VALUES
INCREASE TO OVER 2200 J/KG...WITH 50 KNOTS OF 0-6KM SHEAR BY 0Z. A
WEAK MID LEVEL S/W WILL BE ENOUGH TO INITIATE CONVECTION...WITH
SEVERE STORMS CERTAINLY POSSIBLE. WITH THE SE CWA SO CLOSE TO THE
DAY 1 MODERATE RISK...HAVE ADDED SVR TO THE GRIDS IN THAT
LOCATION. THE CURRENT MCS MOVING ACROSS CENTRAL NEBRASKA MAY
INHIBIT THE NORTHWARD PROGRESSION OF THE WARM FRONT.

IN THE NORTHWEST...AN H7 TROF WILL MOVE INTO NORTH DAKOTA THIS
AFTERNOON. MODELS ARE TRYING TO DEPICT A DRY LINE TO MOVE ACROSS
NORTH DAKOTA AND NORTH CENTRAL SOUTH DAKOTA. THERE IS LITTLE SHEAR
IN THIS LOCATION...HOWEVER ML CAPE VALUES ARE AROUND 2000 J/KG.
EXPECT THUNDERSTORM TO DEVELOP WITH SOME OF THESE BECOMING STRONG.
ML CAPE VALUES QUICKLY WANE AFTER SUNSET...AND BELIEVE ANY STRONG
STORMS SHOULD DIE OFF AS WELL.

DRY AIR BEGINS TO INVADE THE NORTHERN PLAINS BY FRIDAY MORNING
WITH THE BOUNDARY LAYER BECOMING STABILIZED. THIS DRY AIR WILL PUSH
ACROSS THE ENTIRE CWA BY FRIDAY EVENING WITH A RATHER NICE DAY
EXPECTED ON SATURDAY. SOUTHERLY WINDS WILL INCREASE SATURDAY
AFTERNOON AHEAD OF THE NEXT WEATHER SYSTEM.

.LONG TERM...00Z SUNDAY THROUGH 12Z TUESDAY
MODELS ARE IN GENERAL AGREEMENT WITH OVERALL PATTERN THROUGH THE
LONG TERM PERIOD. THE REGION WILL BE IN SOUTHWEST FLOW ALOFT AS A
RESULT OF A WESTERN CONUS TROUGH. SEVERAL SHORTWAVES ARE PROGGED
TO RIDE THROUGH THIS FLOW WITH TIMING STILL UNCERTAIN AND POPS
ABUNDANT IN LONG TERM FORECAST. IT DOES APPEAR THAT THUNDERSTORM
DEVELOPMENT IS LIKELY SUNDAY INTO MONDAY. A MID LEVEL SHORTWAVE
PASSAGE COMBINED WITH INCREASING LOW LEVEL MOISTURE AND A WARM
FRONTAL BOUNDARY SHOULD BE ENOUGH TO INITIATE CONVECTION.
TEMPERATURES APPEAR TO BE SLIGHTLY ABOVE NORMAL FOR THIS TIME
PERIOD.

&&

.AVIATION...
VFR CONDITIONS WILL PREVAIL. A FEW LINGERING SHOWERS AND
THUNDERSTORMS CONTINUE ACROSS THE AREA BUT WILL DISSIPATE
THROUGH THE MORNING HOURS. REDEVELOPMENT OF THUNDERSTORMS IS
EXPECTED THIS AFTERNOON.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
&&

SHORT TERM...SD
LONG TERM...KRAMLICH
AVIATION...KRAMLICH

WEATHER.GOV/ABERDEEN

Hazardous weather outlook, Jun 18, 1:58 PM CDT, 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
158 PM CDT THU JUN 18 2009

MNZ039-046-SDZ003>011-015>023-034>037-191900-
TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL-
ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK-
CODINGTON-GRANT-HAMLIN-DEUEL-SULLY-HUGHES-HYDE-HAND-
158 PM CDT THU JUN 18 2009 /1258 PM MDT THU JUN 18 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND
NORTHEAST SOUTH DAKOTA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

STRONG TO SEVERE THUNDERSTORM ARE POSSIBLE THIS AFTERNOON AND
INTO THE EARLY EVENING HOURS. THE MAIN THREAT FROM THESE STORMS IS
HIGH WINDS AND HAIL...HOWEVER ISOLATED TORNADOES MAY ALSO BE
POSSIBLE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON FRIDAY WITH NONE
EXPECTED TO BECOME SEVERE. AN ACTIVE WEATHER PATTERN RETURNS TO
THE AREA ON SATURDAY NIGHT...WITH THUNDERSTORM CHANCES PERSISTING
THROUGH MONDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING.

SDZ033-045-048-051-191900-
STANLEY-JONES-LYMAN-BUFFALO-
158 PM CDT THU JUN 18 2009 /1258 PM MDT THU JUN 18 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL SOUTH
DAKOTA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED STORMS ARE POSSIBLE THIS AFTERNOON HOWEVER THEY ARE NOT
EXPECTED TO BE SEVERE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON FRIDAY WITH NONE
EXPECTED TO BECOME SEVERE. AN ACTIVE WEATHER PATTERN RETURNS TO
THE AREA ON SATURDAY NIGHT...WITH THUNDERSTORM CHANCES PERSISTING
THROUGH MONDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

CONNELLY

In the hours before

Local storm report, Jun 18, 10:42 AM CDT, 4 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1042 AM CDT THU JUN 18 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0202 PM     TORNADO          12 SE SELBY             45.38N 99.86W
06/16/2009                   WALWORTH           SD   PUBLIC

            BRIEF TOUCHDOWN

&&

NWS

Local storm report, Jun 18, 1:41 PM CDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
141 PM CDT THU JUN 18 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0139 PM     HAIL             1 N MCLAUGHLIN          45.83N 100.81W
06/18/2009  E1.00 INCH       CORSON             SD   EMERGENCY MNGR

            HAIL THE SIZE OF QUARTERS COVERING THE GROUND.

&&

KGILLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 9:37 PM CDT	Special Weather Statement	ABR	Jones	53 min
Jun 17, 10:29 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	21 min
Jun 17, 11:41 PM CDT	Special Weather Statement	ABR	Sully	34 min
Jun 18, 2:39 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	51 min
Jun 18, 2:55 PM CDT	Tornado Warning	ABR	Campbell, McPherson	50 min
Jun 18, 3:17 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	58 min
Jun 18, 3:33 PM CDT	Special Weather Statement	ABR	Dewey	27 min
Jun 18, 3:49 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	56 min
Jun 18, 4:13 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	16 min
Jun 18, 4:43 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	62 min
Jun 18, 6:15 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	60 min
Jun 18, 6:34 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley, Sully	41 min

Nearby

Tornado Warnings in South Dakota, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.