Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 99, NWS Aberdeen, SD

July 10, 20115 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 10, 2011, 5:08 PM CDT for 5 counties in South Dakota. It was in force for 52 min. 3 reports 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: Jul 10, 2011, 5:08 PM CDT (22:08 UTC)
Expired: Jul 10, 2011, 6:00 PM CDT
In force: 52 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Brown County, SD, Day County, SD, Edmunds County, SD, Marshall County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 38 km from the middle of the area, began a volume at 22:10 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
Jul 10, 5:20 PM CDT	TSTM WND GST 60	Britton, SD	TREES DOWN IN THE TOWN OF BRITTON.
Jul 10, 5:30 PM CDT	TSTM WND GST 60	2 Sse Claremont, SD	TOP HALF CUT OFF A 12 FT. TREE. 1 INCH OF RAIN IN 15 MIN.
Jul 10, 5:50 PM CDT	TSTM WND GST 67	14 E Britton, SD	RAWS OBSERVATION

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 12 minutes after it went out.

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
Jul 10, 2:29 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.1 hours before the alert went out and 87 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: 1313 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

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

081 
WUUS53 KABR 102208
SVRABR
SDC013-037-045-091-109-102300-
/O.NEW.KABR.SV.W.0099.110710T2208Z-110710T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
508 PM CDT SUN JUL 10 2011

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN NORTHEAST SOUTH DAKOTA...
  NORTHWESTERN DAY COUNTY IN NORTHEAST SOUTH DAKOTA...
  EAST CENTRAL EDMUNDS COUNTY IN NORTH CENTRAL SOUTH DAKOTA...
  MARSHALL COUNTY IN NORTHEAST SOUTH DAKOTA...
  NORTHWESTERN ROBERTS COUNTY IN NORTHEAST SOUTH DAKOTA...

* UNTIL 600 PM CDT

* AT 506 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTH OF KIDDER TO
  CLAREMONT TO ABERDEEN...MOVING EAST AT 75 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STRATFORD AND LANGFORD AROUND 515 PM CDT...
  HUTTERVILLE COLONY...HILLHEAD AND GROTON AROUND 520 PM CDT...
  VEBLEN...ROY LAKE STATE PARK...PIERPONT AND LAKE CITY AROUND 525 PM
  CDT...
  EDEN...CLAIRE CITY AND ANDOVER AROUND 530 PM CDT...
  ROSLYN AND BRISTOL AROUND 535 PM CDT...

THIS WARNING INCLUDES HIGHWAY 281 BETWEEN MILE MARKERS 181 AND 205.

THIS WARNING INCLUDES HIGHWAY 12 BETWEEN MILE MARKERS 261 AND 335.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION...SEEK SHELTER IN A STURDY STRUCTURE UNTIL THE STORM HAS
PASSED.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SUNDAY EVENING
FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH DAKOTA.

LAT...LON 4592 9702 4526 9774 4527 9869 4542 9920
      4565 9824 4592 9800
TIME...MOT...LOC 2208Z 277DEG 63KT 4596 9763 4564 9801
          4544 9845
WIND...HAIL 60MPH 1.00IN

$$
TMT

2 follow-up statements

505 
WWUS53 KABR 102236
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
536 PM CDT SUN JUL 10 2011

SDC013-037-045-091-109-102300-
/O.CON.KABR.SV.W.0099.000000T0000Z-110710T2300Z/
ROBERTS SD-MARSHALL SD-EDMUNDS SD-DAY SD-BROWN SD-
536 PM CDT SUN JUL 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
BROWN...WESTERN DAY...EAST CENTRAL EDMUNDS...MARSHALL AND
NORTHWESTERN ROBERTS COUNTIES UNTIL 600 PM CDT...

AT 533 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM CLAIRE CITY TO PIERPONT TO 6
MILES NORTHWEST OF MANSFIELD...MOVING EAST AT 70 MPH.

IN ADDITION...STRONG WINDS IN EXCESS OF 60 MPH AND TREE DAMAGE HAS 
BEEN REPORTED ACROSS PARTS OF BROWN AND MARSHALL COUNTIES WITH THESE 
STORMS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  STRATFORD...EDEN AND ANDOVER AROUND 540 PM CDT...
  ROSLYN AND FERNEY AROUND 545 PM CDT...
  BRISTOL AROUND 555 PM CDT...
  HOLMQUIST AROUND 600 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 1000 PM CDT SUNDAY EVENING
FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH DAKOTA.

LAT...LON 4592 9702 4526 9774 4527 9869 4542 9920
      4565 9824 4592 9800
TIME...MOT...LOC 2235Z 277DEG 63KT 4585 9713 4552 9773
          4528 9863
WIND...HAIL 60MPH 1.00IN

$$
TMT

731 
WWUS53 KABR 102302
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
602 PM CDT SUN JUL 10 2011

SDC013-037-045-091-109-102312-
/O.EXP.KABR.SV.W.0099.000000T0000Z-110710T2300Z/
ROBERTS SD-MARSHALL SD-EDMUNDS SD-DAY SD-BROWN SD-
602 PM CDT SUN JUL 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BROWN...WESTERN
DAY...EAST CENTRAL EDMUNDS...MARSHALL AND NORTHWESTERN ROBERTS
COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED
OUT OF THE WARNED AREA...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THESE THUNDERSTORMS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SUNDAY EVENING
FOR WEST CENTRAL MINNESOTA AND NORTHEASTERN SOUTH DAKOTA.

LAT...LON 4592 9702 4526 9774 4527 9869 4542 9920
      4565 9824 4592 9800
TIME...MOT...LOC 2236Z 277DEG 63KT 4581 9710 4549 9771
          4526 9862

$$
TMT

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 10, 3:17 PM CDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jul 10, 3:17 PM CDT, 1 hour 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
317 PM CDT SUN JUL 10 2011

.SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT
MAIN CHALLENGE IN THE NEAR TERM IS THUNDERSTORM POTENTIAL AND
TRACK THIS EVENING. COMPLEX OF STORMS CURRENTLY OVER SOUTH CENTRAL
NORTH DAKOTA WILL LIKELY DROP ACROSS THE BORDER INTO SOUTH DAKOTA
LATE THIS AFTERNOON AND EVENING. STRONG INSTABILITY AND GOOD SHEAR
WILL KEEP THE THREAT OF SEVERE WEATHER GOING AS THEY DO...FAR
NORTHERN PART OF CWA HAS RECENTLY BEEN UPGRADED TO A MODERATE
RISK. MAIN THREATS LOOK TO BE LARGE HAIL AND STRONG WINDS...BUT
WITH THE DECENT SHEAR IN PLACE...CANNOT RULE OUT THE POSSIBILITY
OF A FEW TORNADOES. STORMS SHOULD EXIT THE REGION TO THE EAST
BEFORE MIDNIGHT WITH HIGH PRESSURE DROPPING OVER THE AREA AFTER
THAT. QUESTION THEN BECOMES JUST HOW DOMINANT THE HIGH WILL BE
OVER THE REST OF THE PERIOD AS A COUPLE MODELS SHOW IT DOMINATING
AND KEEPING CONDITIONS DRY...WHILE A COUPLE OTHER MODELS SHOW THE
HIGH GETTING PUSHED SLIGHTLY TO THE NORTHEAST BY A LOW PRESSURE
SYSTEM DEVELOPING OVER THE WESTERN HIGH PLAINS AND POSSIBLE
SPREADING PRECIPITATION TO THE WESTERN AND SOUTHERN CWA. AT THIS
TIME...HAVE OPTED TO KEEP SMALL POPS IN THOSE AREAS MONDAY AND
MONDAY NIGHT...THEN GO DRY ON TUESDAY AND TUESDAY NIGHT.

TEMPERATURES WILL BE RIGHT AROUND NORMAL ON MONDAY...THEN A BIT
COOLER UNDER THE INFLUENCE OF THE HIGH ON TUESDAY.

.LONG TERM...WEDNESDAY THROUGH SUNDAY
ON WEDNESDAY...SFC HIGH IS MOVING EAST OF THE AREA AND MODELS
AGREE FAIRLY WELL IN SHOWING A FAST MOVING SHORTWAVE TREKKING
ACROSS THE DAKOTAS. THUNDERSTORM CHANCES WOULD BE FAIRLY DECENT
WITH THIS WAVE OF ENERGY GIVEN THE MOISTURE AND INSTABILITY. LEFT
PRECIP CHANCES IN THE 40 TO 50 PERCENT RANGE AT THIS TIME. TOWARDS
THE END OF THE WEEK AND WEEKEND...LARGE UPPER HIGH RESIDES ACROSS
MUCH OF THE SOUTHERN/SOUTHEASTERN UNITED STATES. THIS UPPER HIGH
LOOKS TO HEAD BACK TO THE WEST...THUS INCREASING THE HEIGHTS
ACROSS THE NORTHERN PLAINS. 850 MB TEMPS RISE TO AROUND +30C AS
WELL. COULD BE LOOKING AT A HOT AND HUMID WEATHER PATTERN BY THE
END OF THE WEEK AND INTO NEXT WEEK. ALTHOUGH...MODELS STILL
SHOWING SEVERAL RIDGE RIDING WAVES MOVING ATOP THE UPPER HIGH SO
WILL STILL HAVE TO LEAVE THUNDERSTORM CHANCES IN THE FORECAST.

&&

.AVIATION...
TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS
TSRA POSSIBLE NEAR KMBG EARLY IN THE AFTERNOON WITH ACTIVITY
SPREADING EAST TOWARDS KABR BY LATER IN AFTERNOON...EVENTUALLY
NEAR KATY BY EVENING. LESSER CHANCE FOR TSRA ACTIVITY IN KPIR
AREA. +TSRA POSSIBLE AS WELL WITH GR /HAIL/ AND STRONG SFC WND
GUSTS GREATER THAN 50 KNOTS. MVFR CONDITIONS WITHIN HEAVIER
TSRA/+TSRA...AND POTENTIALLY IFR VSBYS. AREAS THAT DO NOT
EXPERIENCE TSRA ACTIVITY WILL LIKELY REMAIN VFR THRU THE DAY AND
INTO THE EVENING HOURS. TSRA WILL EXIT TO THE EAST OF THE REGION
TONIGHT WITH VFR CONDITIONS THEN THRU MONDAY.

&&

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

SHORT TERM...PARKIN
LONG TERM...TMT
AVIATION...TMT

WEATHER.GOV/ABERDEEN

Hazardous weather outlook, Jul 10, 4:04 AM CDT, 13 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
404 AM CDT SUN JUL 10 2011

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-110915-
TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL-
ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK-
CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-
LYMAN-BUFFALO-
404 AM CDT SUN JUL 10 2011 /304 AM MDT SUN JUL 10 2011/

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

.DAY ONE...TODAY AND TONIGHT

STORMS WILL FIRE IN THE HEAT OF THE AFTERNOON...WITH THE RISK FOR
STRONG WINDS...LARGE HAIL...AND ISOLATED TORNADOES FOR MOST OF THE
CWA. STORMS WILL PROPAGATE INTO MINNESOTA DURING THE EVENING AND
OVERNIGHT HOURS...DECREASING IN INTENSITY.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A CHANCE FOR THUNDERSTORMS THROUGH THE UPCOMING WORK
WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND EVENING.

CONNELLY

In the hours before

Local storm report, Jul 10, 3:37 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
337 PM CDT SUN JUL 10 2011

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

0335 PM     HAIL             POLLOCK                 45.90N 100.29W
07/10/2011  E1.00 INCH       CAMPBELL           SD   LAW ENFORCEMENT

&&

PARKIN

Local storm report, Jul 10, 4:39 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
439 PM CDT SUN JUL 10 2011

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

0439 PM     TSTM WND GST     1 W ROSCOE              45.45N 99.36W
07/10/2011  E55 MPH          EDMUNDS            SD   PUBLIC

&&

CM

Local storm report, Jul 10, 5:02 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
502 PM CDT SUN JUL 10 2011

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

0455 PM     TSTM WND DMG     HECLA                   45.88N 98.15W
07/10/2011                   BROWN              SD   FIRE DEPT/RESCUE

            TREES DOWN

&&

PARKIN

Local storm report, Jul 10, 5:06 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
506 PM CDT SUN JUL 10 2011

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

0500 PM     TSTM WND GST     3 N ABERDEEN            45.51N 98.48W
07/10/2011  E60 MPH          BROWN              SD   LAW ENFORCEMENT

&&

PARKIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:18 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hyde, Potter, Sully	42 min
Jul 9, 8:53 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Walworth	52 min
Jul 9, 9:30 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson, Walworth	30 min
Jul 9, 9:51 PM CDT	Severe Thunderstorm Warning	ABR	Potter, Walworth	39 min
Jul 9, 9:57 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	48 min
Jul 9, 10:08 PM CDT	Tornado Warning	ABR	Potter	49 min
Jul 9, 10:34 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	10 min
Jul 9, 10:43 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hyde, Potter	41 min
Jul 10, 3:30 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	45 min
Jul 10, 3:37 PM CDT	Severe Thunderstorm Warning	ABR	Campbell	23 min
Jul 10, 4:06 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	24 min
Jul 10, 4:12 PM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson, Marshall	63 min
Jul 10, 4:32 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	43 min
Jul 10, 4:46 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	44 min
Jul 10, 5:47 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Day, Grant, Marshall, Roberts	58 min
Jul 10, 6:01 PM CDT	Flash Flood Warning	ABR	Brown, Day, Marshall	4 hr
Jul 10, 6:42 PM CDT	Severe Thunderstorm Warning	ABR	Brown	33 min
Jul 10, 6:47 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day, Deuel, Grant, Roberts	58 min
Jul 10, 6:56 PM CDT	Tornado Warning	ABR	Grant, Roberts	34 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.