Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 138, NWS Aberdeen, SD

July 26, 2011Big Stone County, Traverse County, Minnesota; Day County, Grant County, Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 26, 2011, 9:56 PM CDT for Big Stone County, Traverse County, Minnesota; Day County, Grant County, Roberts County, South Dakota. It was in force for 64 min. 4 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 26, 2011, 9:56 PM CDT (02:56 UTC)
Expired: Jul 26, 2011, 11:00 PM CDT
In force: 64 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Big Stone County, MN, Traverse County, MN, Day County, SD, Grant County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 151 km from the middle of the area, began a volume at 02:59 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 26, 10:20 PM CDT	TSTM WND DMG	3 Se Clinton, MN	LARGE TREES BLOWN OVER AND TELEPHONE POLES LEANING
Jul 26, 10:25 PM CDT	TSTM WND GST 95	2 S Clinton, MN	LARGE COTTONWOOD TREE UPROOTED. ESTIMATED TREE HEIGHT 50 FOOT WITH 8 FOOT HOLE IN GROUND WHERE ROOT BALL RESIDED. TREE WAS LAYING FROM NE TO SW. NO STRUCTURAL DAMAGE SEEN TO CHURCH NEXT TO TREE.
Jul 26, 10:28 PM CDT	TSTM WND GST 75	2 Se Clinton, MN	NUMEROUS LARGE TREES DOWN AND SNAPPED AT FARM LOCATION. NO STRUCTURAL DAMAGE SEEN. TREES WERE LAYING FROM WSW TO ESE IN DIRECTION.
Jul 26, 10:31 PM CDT	TSTM WND GST 80	3 Se Clinton, MN	WIDESPREAD TREE AND STRUCTURAL DAMAGE TO FARMSTEAD. CORN ON WEST SIDE OF PLACE WAS LAYING NORTH TO SOUTH. TREES AND OUTBUILDINGS ON FARMPLACE SHOWED WINDS FROM SOUTH TO NORTH. 2 OUTBUILDINGS SUFFERED ROOF LOSS WITH SIGNIFICANT DAMAGE TO 1 OF THEM. ANOTHER GARA

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 4 storm reports to this severe thunderstorm warning; the first came 24 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 26, 7:32 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.9 hours before the alert went out and 160 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: 3555 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 289 m²/s²
0-3 km storm-relative helicity: 399 m²/s²
Significant tornado parameter: 7.2
Supercell composite: 32.6

Open this sounding in Storm Lab

The text

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

925 
WUUS53 KABR 270256
SVRABR
MNC011-155-SDC037-051-109-270400-
/O.NEW.KABR.SV.W.0138.110727T0256Z-110727T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
956 PM CDT TUE JUL 26 2011

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BIG STONE COUNTY IN WEST CENTRAL MINNESOTA...
  TRAVERSE COUNTY IN WEST CENTRAL MINNESOTA...
  EAST CENTRAL DAY COUNTY IN NORTHEAST SOUTH DAKOTA...
  GRANT COUNTY IN NORTHEAST SOUTH DAKOTA...
  ROBERTS COUNTY IN NORTHEAST SOUTH DAKOTA...

* UNTIL 1100 PM CDT

* AT 955 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 80 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM COLLIS TO 7 MILES EAST OF CORONA TO 6 MILES SOUTH OF
  SUMMIT...MOVING SOUTHEAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LAGOONA BEACH AND CLINTON AROUND 1005 PM CDT...
  TWIN BROOKS AROUND 1010 PM CDT...
  ORTONVILLE...MILBANK AND BIG STONE CITY AROUND 1015 PM CDT...
  STOCKHOLM AROUND 1025 PM CDT...
  ARTICHOKE AROUND 1035 PM CDT...
  LA BOLT AROUND 1040 PM CDT...
  REVILLO AND ALBEE AROUND 1045 PM CDT...

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
JOHNSON...ODESSA AND CORRELL.

THIS WARNING INCLUDES INTERSTATE 29 BETWEEN MILE MARKERS 203 AND 252.

THIS WARNING INCLUDES HIGHWAY 12 BETWEEN MILE MARKERS 360 AND 399.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS AND DESTRUCTIVE HAIL CAPABLE OF
PRODUCING SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS MARSHALL...ROBERTS...AND DAY COUNTIES IN NORTHEAST SOUTH 
DAKOTA.  THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW 
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT WEDNESDAY MORNING
FOR WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. A TORNADO
WATCH ALSO REMAINS IN EFFECT UNTIL 100 AM CDT WEDNESDAY MORNING FOR
NORTHEASTERN SOUTH DAKOTA.

LAT...LON 4519 9618 4525 9632 4526 9644 4498 9645
      4498 9665 4543 9734 4569 9713 4595 9685
      4594 9626 4542 9623 4541 9611 4519 9610
TIME...MOT...LOC 0256Z 306DEG 26KT 4565 9639 4535 9662
          4522 9703
WIND...HAIL 80MPH <.75IN

$$
HINTZ

2 follow-up statements

822 
WWUS53 KABR 270329
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1029 PM CDT TUE JUL 26 2011

SDC037-270338-
/O.CAN.KABR.SV.W.0138.000000T0000Z-110727T0400Z/
DAY SD-
1029 PM CDT TUE JUL 26 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DAY COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED OR MOVED
OUT OF THE WARNED AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT WEDNESDAY MORNING
FOR WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. A TORNADO
WATCH ALSO REMAINS IN EFFECT UNTIL 100 AM CDT WEDNESDAY MORNING FOR
NORTHEAST SOUTH DAKOTA.

LAT...LON 4519 9610 4519 9618 4525 9632 4526 9644
      4498 9645 4498 9664 4536 9723 4567 9707
      4594 9664 4594 9626 4542 9623 4541 9611
TIME...MOT...LOC 0328Z 306DEG 26KT 4551 9613 4521 9636
          4508 9677

$$

MNC011-155-SDC051-109-270400-
/O.CON.KABR.SV.W.0138.000000T0000Z-110727T0400Z/
TRAVERSE MN-BIG STONE MN-ROBERTS SD-GRANT SD-
1029 PM CDT TUE JUL 26 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR GRANT...
ROBERTS...BIG STONE AND TRAVERSE COUNTIES UNTIL 1100 PM CDT...

AT 1026 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 8 MILES NORTH OF ARTICHOKE TO 7 MILES SOUTHEAST OF
ORTONVILLE TO STOCKHOLM...MOVING SOUTHEAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ARTICHOKE AND LA BOLT AROUND 1035 PM CDT...
  ALBEE AROUND 1040 PM CDT...
  REVILLO AROUND 1045 PM CDT...

OTHER LOCATIONS IMPACTED BY THIS LINE OF SEVERE THUNDERSTORMS INCLUDE
CORRELL.

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.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
MARSHALL...DAY AND ROBERTS COUNTIES. THIS IS AN EXTREMELY DANGEROUS 
SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS!

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT WEDNESDAY MORNING
FOR WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. A TORNADO
WATCH ALSO REMAINS IN EFFECT UNTIL 100 AM CDT WEDNESDAY MORNING FOR
NORTHEAST SOUTH DAKOTA.

LAT...LON 4519 9610 4519 9618 4525 9632 4526 9644
      4498 9645 4498 9664 4536 9723 4567 9707
      4594 9664 4594 9626 4542 9623 4541 9611
TIME...MOT...LOC 0328Z 306DEG 26KT 4551 9613 4521 9636
          4508 9677
WIND...HAIL 70MPH <.75IN

$$
HINTZ

168 
WWUS53 KABR 270357
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1057 PM CDT TUE JUL 26 2011

MNC011-155-SDC051-109-270408-
/O.EXP.KABR.SV.W.0138.000000T0000Z-110727T0400Z/
TRAVERSE MN-BIG STONE MN-ROBERTS SD-GRANT SD-
1057 PM CDT TUE JUL 26 2011

...THE SEVERE THUNDERSTORM WARNING FOR GRANT...ROBERTS...BIG STONE
AND TRAVERSE COUNTIES WILL EXPIRE AT 1100 PM CDT/1000 PM MDT/...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT WEDNESDAY MORNING
FOR WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA.

LAT...LON 4519 9610 4519 9618 4525 9632 4526 9644
      4498 9645 4498 9664 4536 9723 4567 9707
      4594 9664 4594 9626 4542 9623 4541 9611
TIME...MOT...LOC 0358Z 306DEG 26KT 4538 9588 4508 9611
          4495 9652

$$
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 26, 3:43 PM CDT, 6 hours 13 minutes earlier.

Area forecast discussion, Jul 26, 3:43 PM CDT, 6 hours 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
343 PM CDT TUE JUL 26 2011

.SHORT TERM...THROUGH FRIDAY MORNING

MAIN FOCUS IS ON NEAR TERM. GUIDANCE CONTINUES TO INDICATE
FAVORABLE ENVIRONMENT FOR SEVERE STORM DEVELOPMENT ALONG AND EAST
OF THE MISSOURI VALLEY DURING THE MID TO LATE AFTERNOON HOURS. THE
STORM ENVIRONMENT IS MARKED BY MIXED LAYER CAPE VALUES UPWARDS OF
3000 J/KG ALONG WITH STRONG SPEED AND DIRECTIONAL SHEAR. FOCUS
MECHANISM IS BOUNDARY FROM HOSMER DOWN TO CLARK...MARKING WHERE
LATE MORNING CONVECTION HAS MODIFIED THE LOW LEVEL AIRMASS. ALSO
MONITORING SOUTH CENTRAL COUNTIES WHERE TEMPERATURES HAVE WARMED
CLOSE TO THE CONVECTIVE TEMPERATURE. WARM AIR ALOFT STILL THE MAIN
ISSUE...ESPECIALLY AS HEATING HAS BEEN DELAYED OVER MUCH OF THE
CWA. ANTICIPATING A MID AFTERNOON INITIATION TIME FOR SURFACE BASED
CONVECTION.

AS SYSTEM PROGRESSES EAST TONIGHT...LOW LEVEL JET WILL SET UP OVER
THE EASTERN CWA. BEST CONVERGENCE LOOKS TO BE IN NORTH
DAKOTA...WITH CORFIDI VECTORS IN THE 25 TO 35KT RANGE AND PWATS
CLOSE TO TWO INCHES. POTENTIAL EXISTS FOR LOCALIZED FLOODING IN
AREAS ALREADY IMPACTED A HIGH WATER TABLE AND SWOLLEN RIVERS...EAST
OF THE JAMES VALLEY.

ZONAL FLOW DOMINATES THE REST OF THE FORECAST PERIOD...WITH A WEAK
LOW MOVING ACROSS CENTRAL SOUTH DAKOTA THURSDAY. TEMPERATURES
SHOULD BE NEAR CLIMO DUE TO THE TRANSIENT NATURE OF WEATHER
SYSTEMS THROUGH THE FORECAST PERIOD.

.LONG TERM...FRIDAY THROUGH TUESDAY
AN ACTIVE WEATHER PATTERN IS EXPECTED FOR THE NORTHERN PLAINS
THROUGH THE EXTENDED PORTION OF THE FORECAST. WITH BASICALLY ZONAL
FLOW ACROSS THE REGION AND SEVERAL WEAK SHORT WAVES EMBEDDED
WITHIN THE FLOW PATTERN...THERE WILL BE AT LEAST A SCHC TO CHC FOR
THUNDERSTORMS EVERY 18 TO 24 HOURS. MODELS ARE STILL INDICATING A
WARMING TREND FOR THE WEEKEND AS HEIGHTS INCREASE ACROSS THE
REGION. THE LATEST ADJMEX GUIDANCE IS SHOWING HIGH TEMPERATURES IN
KABR COULD BE IN THE UPPER 90S BY SUNDAY. BASED ON 1000-500 MB
HEIGHTS...WILL UNDERCUT ADJMEX GUIDANCE AND MAINTAIN HIGH
TEMPERATURES IN THE UPPER 80S TO THE LOWER 90S FOR THE WEEKEND.

&&

.AVIATION...
TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS

THIS AFTERNOON THE STAGE IS SET FOR SEVERE THUNDERSTORMS
ESPECIALLY NEAR KPIR/KABR. LARGE HAIL AND STRONG WINDS ARE POSSIBLE
FROM 22Z TODAY THROUGH 12Z WEDNESDAY. TAF SITES MAY SEE IFR
CONDITIONS IN HEAVIER RAIN SHOWERS. ALL TAF SITES ARE EXPECTED TO
SEE TSTORMS AT SOME POINT THROUGH THE EVENING AND OVERNIGHT.

&&

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

SHORT TERM...CONNELLY
LONG TERM...SD
AVIATION...SD

WEATHER.GOV/ABERDEEN

Hazardous weather outlook, Jul 26, 4:35 AM CDT, 17 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
435 AM CDT TUE JUL 26 2011

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-270945-
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-
435 AM CDT TUE JUL 26 2011 /335 AM MDT TUE JUL 26 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

SEVERE STORMS ARE EXPECTED ACROSS THE AREA LATE THIS AFTERNOON AND
THROUGH THE EVENING HOURS. LARGE HAIL...DAMAGING WINDS AND
TORNADOES ARE POSSIBLE. RIGHT NOW IT APPEARS THE AREAS WITH THE
BEST CHANCE TO SEE TORNADIC THUNDERSTORMS ARE ACROSS NORTHERN
SOUTH DAKOTA INTO WEST CENTRAL MINNESOTA. VERY HEAVY RAIN IS ALSO
POSSIBLE WITH THE STRONGER THUNDERSTORMS.

HEAT INDEX VALUES WILL TOP OUT AROUND 100 DEGREES THIS AFTERNOON
FROM THE JAMES RIVER VALLEY WESTWARD TO THE MISSOURI RIVER.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

OFF AND ON CHANCES FOR THUNDERSTORMS ARE IN THE FORECAST FOR THE
REMAINDER OF THE WEEK AND INTO THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON AND
THROUGH THE EVENING HOURS.

TMT

In the hours before

Local storm report, Jul 26, 8:52 PM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
852 PM CDT TUE JUL 26 2011

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

0715 PM     TORNADO          HOVEN                   45.24N 99.78W
07/26/2011                   POTTER             SD   EMERGENCY MNGR

            ROOF BLOWN OFF OF BUSINESS. MANY TREES DOWN ON NORTH SIDE
            OF HOVEN.

&&

CM

Local storm report, Jul 26, 9:06 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
906 PM CDT TUE JUL 26 2011

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

0906 PM     TSTM WND GST     ROSLYN                  45.50N 97.49W
07/26/2011  E80 MPH          DAY                SD   FIRE DEPT/RESCUE

&&

CM

Local storm report, Jul 26, 9:17 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
917 PM CDT TUE JUL 26 2011

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

0915 PM     TSTM WND GST     ROSLYN                  45.50N 97.49W
07/26/2011  E100 MPH         DAY                SD   FIRE DEPT/RESCUE

            MANY LARGE TREES DOWN. HIGHWAY 25 IMPASSIBLE DUE TO TREES
            DOWN ON HIGHWAY.

&&

CM

Local storm report, Jul 26, 9:27 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
927 PM CDT TUE JUL 26 2011

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

0900 PM     HEAVY RAIN       20 N ABERDEEN           45.76N 98.48W
07/26/2011  M2.60 INCH       BROWN              SD   TRAINED SPOTTER

            2.60 INCHES IN 2 HOURS. WATER IN BASEMENT AND SURROUNDING
            HOUSE.

&&

PARKIN

Local storm report, Jul 26, 9:33 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
933 PM CDT TUE JUL 26 2011

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

0925 PM     TSTM WND GST     PEEVER                  45.54N 96.96W
07/26/2011  E60 MPH          ROBERTS            SD   PUBLIC

            60-70 MPH WINDS. LARGE TREES DOWN.

&&

CM

Local storm report, Jul 26, 9:48 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
948 PM CDT TUE JUL 26 2011

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

0947 PM     TSTM WND GST     SISSETON                45.66N 97.05W
07/26/2011  E60 MPH          ROBERTS            SD   EMERGENCY MNGR

            SIGNS BLOWN OVER IN SISSETON.

&&

CM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 9:20 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	40 min
Jul 26, 7:03 PM CDT	Tornado Warning	ABR	Edmunds, Potter, Walworth	27 min
Jul 26, 7:24 PM CDT	Tornado Warning	ABR	Edmunds, Walworth	36 min
Jul 26, 7:28 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Faulk, Hand, Hyde, Lyman, Spink	47 min
Jul 26, 7:34 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Marshall	56 min
Jul 26, 7:54 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Marshall	66 min
Jul 26, 8:25 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	65 min
Jul 26, 8:30 PM CDT	Tornado Warning	ABR	Marshall, Roberts	30 min
Jul 26, 8:36 PM CDT	Tornado Warning	ABR	Marshall, Roberts	24 min
Jul 26, 8:42 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	48 min
Jul 26, 9:04 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Day, Marshall	41 min
Jul 26, 9:11 PM CDT	Flash Flood Warning	ABR	Brown, Marshall, Roberts	6 hr
Jul 26, 9:11 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Hamlin, Spink	49 min
Jul 26, 9:42 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall	33 min
Jul 27, 12:44 PM CDT	Areal Flood Warning	ABR	Marshall	7 days
Jul 27, 2:13 PM CDT	Areal Flood Warning	ABR	Roberts	72 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011 Severe Thunderstorm Warnings in Minnesota, 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.