Alert archive / South Dakota / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 152, NWS Sioux Falls, SD

July 7, 2010Brookings County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 2010, 12:38 AM CDT for Brookings County, South Dakota. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 7, 2010, 12:38 AM CDT (05:38 UTC)
Expired: Jul 7, 2010, 1:15 AM CDT
In force: 37 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 58.0 mph

County Brookings County, SD

The radar

The Sioux Falls radar (KFSD), 87 km from the middle of the area, began a volume at 05:40 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.6 hours before the alert went out and 140 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: 1773 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 441 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 4:08 PM CDT, 8 hours 30 minutes earlier.

Area forecast discussion, Jul 6, 4:08 PM CDT, 8 hours 30 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
408 PM CDT TUE JUL 6 2010

.DISCUSSION...
CONVECTION BREAKING OUT RIGHT ON TRACK WITH THE SHORT RANGE HRRR
MODEL IN SCNTRL SD...AND CONCERN IN THE SHORT TERM LARGELY ON THE
SEVERE WEATHER AND HEAVY RAIN THREAT. MID AFTERNOON SFC ANALYSIS
INDICATES BNDRY SHARPENING UP THRU SCNTRL SD...WITH MOISTURE TONGUE
WRAPPED FROM BACKED SERN SD/NERN NEBRASKA FLOW. THIS HAS RESULTED IN
ARND 2000 J/KG MLCAPE...ONLY WKLY CAPPED. SHEAR PARAMETERS ARE EVEN
A BIT BETTER AT LOW LVLS THAN EARLIER PROGGED...WITH A GREATLY
TURNING AND STRONGER WIND FLOW THRU LOWEST 2KM.  LOWER BRULE AREA
REALLY A FOCUS FOR BEST OVERLAP OF EXISTING LOW LVL VORTICITY WITHIN
FRONTOGENETIC ZONE...AND 0-3KM CAPE. TOR WATCH WAS ISSUED SHORTLY
AFT 2PM.  SHEAR DOES NOT SEEM TO SUPPORT MOTION SUGGESTED BY HRRR
WHICH RACES SUPERCELLULAR STRUCTURES INTO THE KFSD AREA BY 01Z...BUT
RATHER WOULD SUGGEST A MODEST EWRD PROGRESSION TO AREA OF CONVECTION.
THIS SFC BASED CONVECTION WOULD THEN PERHAPS FIND A WEAKENING OF
COVERAGE LATER THIS EVENING AS WAVE STARTS TO SHEAR NEWRD THRU ND.
ADDITIONAL IMPULSE REINFORCES FRONTAL LINEAR FORCING LATER TONIGHT...
AND INCREASED POPS LATER ON IN NIGHT TO REFLECT STRONGER FORCING AS
BODILY TROUGH PUSHES EWRD LATE NIGHT.

ALSO A HEAVY RAIN THREAT AS DEEPER WIND MOTION HAS STRONGLY PARALLEL
COMPONENT TO BOUNDARY. FOR THE TIME...DID NOT ISSUE FFA AS STORMS
SHUD BE A BIT MORE DISCRETE TO START...BUT EVENING ACTION MAY SET UP
ADDITIONAL PROBLEMS FOR LATER NIGHT ACTIVITY...AND CAN ADDRESS AFTER
THE SHORT TERM SVR THREAT. /CHAPMAN

WEDNESDAY LOOKS LIKE A DAY WITH THE POTENTIAL FOR OCCASIONAL SHOWERS
AND THUNDERSTORMS THROUGHOUT THE DAY WITH LITTLE IN THE WAY OF
CAPPING AND A WEAK AND MOIST SFC BOUNDARY HANGING AROUND. THE THREAT
FOR SEVERE FAIRLY MINIMAL...BUT WOULD NOT BE SURPRISED AT A FEW
ISOLATED HAILER OR HIGH WIND REPORTS. INITIALLY THE BETTER CHANCE
SHOULD BE CONFINED TO THE NORTHWEST HALF OF THE CWA...SO DECREASED
HIGHS A SMIDGE...WHILE INCREASING A BIT OVER THE SOUTHEAST HALF AS
THE THREAT FOR THUNDERSTORMS SHOULD BE LATER. DID INCREASE TO 60-70
POPS FOR THE ENTIRE AREA THROUGH THE DAY.

BY WEDNESDAY NIGHT THE MAIN THREAT WILL BE LIFTING OUT SO HAVE POPS
MAINLY ALONG AND EAST OF I29 IN THE EVENING. AFTER THIS SHOULD BE
CLEARING SKIES AND DECREASING HUMIDITY. LOWS LIKELY IN THE 50S.

THURSDAY AND FRIDAY LOOK LIKE VERY NICE DAYS WITH NO MAJOR THREAT
FOR THUNDERSTORMS...WINDS MAINLY UNDER 15 MPH AND MOSTLY SUNNY
SKIES.LOWS IN THE 50S AND HIGHS IN THE 80S.

IN THE LATTER PERIODS(SAT/TUE)...OVERALL LOOKS LIKE THE POTENTIAL TO
CONTINUE WITH A RELATIVELY BUSY PATTERN. GENERALLY FAST WEST TO
NORTHWEST FLOW EXPECTED ALOFT WITH SOME POORLY AGREED UPON TROFING
SOMETIME OVER THE WEEKEND. SO...WILL NEED LOW END POPS FOR MUCH OF
THE PERIOD WITH THIS PATTERN...AND EXPECT TEMPERATURES TO BE NEAR
NORMAL THROUGHOUT. SATURDAY NIGHT INTO SUNDAY DOES LOOK LIKE A
PERIOD WHERE TEMPERATURES COULD BE A LITTLE ABOVE NORMAL ASSUMING
THUNDERSTORMS ARE NOT TOO WIDESPREAD. /08

&&

.AVIATION...
CONVECTIVE POTENTIAL LARGEST CHALLENGE TO TAFS.  MAIN AREA UNDER THE
GUN FOR SFC THREAT WOULD BE KHON AND AREAS FROM JAMES VALLEY AND
WWRD THRU THE EARLY EVNG. THE CONVECTIVE ACTIVITY WILL LIKELY
PRODUCE HEAVY RAIN REDUCING VISIBILITIES BRIEFLY BLO 1SM...BUT
TAFWISE WOULD SEEM THAT 2SM WOULD BE SUFFICIENT. THESE STORMS WILL
AFFECT THE KHON TERMINAL AFTER 22Z...AND TOWARD/AFT 12Z WEDNESDAY AT
THE KFSD AND KSUX TERMINALS. /CHAPMAN

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.

&&

Hazardous weather outlook, Jul 6, 11:45 AM CDT, 12 hours 53 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1145 AM CDT TUE JUL 06 2010

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-071200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
1145 AM CDT TUE JUL 06 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
INITIAL DEVELOPMENT OF THUNDERSTORMS IS EXPECTED VERY LATE THIS
AFTERNOON INTO EARLY EVENING FROM THE MID JAMES VALLEY TOWARD THE
LOWER BRULE AREA.  EARLY DISCRETE STORMS WILL BE CAPABLE OF HAIL
TO GOLF BALL SIZE...WIND GUSTS TO 65 MPH...AND EVEN A BRIEF
TORNADO.  THESE STORMS ARE EXPECTED TO BECOME MORE NUMEROUS
THROUGH THE EVENING HOURS...WITH THE THREAT TRANSITIONING TO MORE
DAMAGING WIND AND HAIL TO QUARTER SIZE MOVING EAST TOWARD DE
SMET...MITCHELL...AND LAKE ANDES.  THE SLOW EASTWARD MOVEMENT OF
STORMS OVERNIGHT WILL ALSO CONTRIBUTE TO A HEAVY RAINFALL
THREAT...WITH ANOTHER INCH TO TWO OF RAINFALL POSSIBLE FOR
LOCATIONS WEST OF A DE SMET TO LAKE ANDES LINE.

FLOODING...
THE JAMES RIVER WILL REMAIN IN FLOOD FOR THE FORESEEABLE FUTURE.
ELSEWHERE...RIVERS CONTINUE TO FALL. THE LITTLE SIOUX RIVER NEAR
LINN GROVE WILL ALSO BE IN FLOOD UNTIL MID WEEK. ADDITIONAL HEAVY
RAINFALL OVER THE NEXT DAY OR TWO COULD STALL OR REVERSE FALLING
TRENDS IN AREA RIVER LEVELS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SHOWERS AND A FEW THUNDERSTORMS WILL MOVE EAST AND SOUTHEAST OVER
THE AREA THROUGH WEDNESDAY. LOCALLY HEAVY RAIN WILL BE
POSSIBLE...ALONG WITH ISOLATED SEVERE STORMS MAINLY SOUTHEAST OF
A LINE FROM MARSHALL TO YANKTON...BUT A WIDESPREAD SEVERE WEATHER
THREAT IS NOT EXPECTED.

THE PATTERN WILL STILL BE FAVORABLE FOR A FEW SEVERE OR HEAVY
THUNDERSTORMS AT TIMES FROM LATE SATURDAY INTO NEXT WEEK...MAINLY
IN THE NIGHTTIME HOURS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 5 PM CDT WEST OF THE
JAMES RIVER.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

In the hours before

Local storm report, Jul 6, 7:43 PM CDT, 4 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
743 PM CDT TUE JUL 06 2010

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

0655 PM     HAIL             4 W HARRISON            43.44N 98.61W
07/06/2010  M1.75 INCH       DOUGLAS            SD   TRAINED SPOTTER

            GOLF BALL SIZE HAIL STRIPPED CORN.

&&

MDB

Local storm report, Jul 6, 8:07 PM CDT, 4 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
807 PM CDT TUE JUL 06 2010

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

0735 PM     HAIL             6 ENE PUKWANA           43.81N 99.07W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

            MARBLE TO QUARTER SIZE HAIL COVERED THE GROUND.

&&

WILLIAMS

Local storm report, Jul 6, 8:38 PM CDT, 4 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
838 PM CDT TUE JUL 06 2010

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

0825 PM     HAIL             2 N KIMBALL             43.78N 98.96W
07/06/2010  M1.00 INCH       BRULE              SD   PUBLIC

            1 INCH HAIL MAKING THE GROUND WHITE.

&&

MDB

Local storm report, Jul 6, 9:22 PM CDT, 3 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
922 PM CDT TUE JUL 06 2010

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

0910 PM     HAIL             1 W KIMBALL             43.75N 98.98W
07/06/2010  E1.00 INCH       BRULE              SD   TRAINED SPOTTER

&&

MDB

Local storm report, Jul 6, 9:24 PM CDT, 3 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
924 PM CDT TUE JUL 06 2010

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

0823 PM     HAIL             5 E KIMBALL             43.75N 98.86W
07/06/2010  E1.75 INCH       BRULE              SD   TRAINED SPOTTER

            PEA TO QUARTER SIZED HAIL COVERING THE GROUND, WITH A FEW
            GOLF BALL SIZE.

&&

MJF

Local storm report, Jul 6, 10:31 PM CDT, 2 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1031 PM CDT TUE JUL 06 2010

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

0355 PM     HAIL             5 S CHAMBERLAIN         43.73N 99.31W
07/06/2010  E1.00 INCH       BRULE              SD   TRAINED SPOTTER

0410 PM     HAIL             2 S CHAMBERLAIN         43.78N 99.32W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

0410 PM     HAIL             2 SSW CHAMBERLAIN       43.78N 99.34W
07/06/2010  E1.50 INCH       BRULE              SD   TRAINED SPOTTER

            MOSTLY QUARTER SIZE WITH A FEW LARGER

0421 PM     TORNADO          10 SSE CHAMBERLAIN      43.69N 99.23W
07/06/2010                   BRULE              SD   STORM CHASER

            BRIEF TOUCHDOWN NOTED VIA STREAMING VIDEO

0425 PM     HAIL             2 SW PUKWANA            43.75N 99.21W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

0452 PM     HAIL             7 SSE PUKWANA           43.69N 99.13W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

0535 PM     HAIL             8 SE KIMBALL            43.66N 98.84W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

0548 PM     TORNADO          13 NNW PLATTE           43.56N 98.92W
07/06/2010                   BRULE              SD   LAW ENFORCEMENT

            TWO BRIEF TOUCHDOWNS

0616 PM     HAIL             11 NNW PLATTE           43.55N 98.90W
07/06/2010  E1.75 INCH       BRULE              SD   PUBLIC

            GOLF BALL HAIL AND WINDS ESTIMATED AT 50 TO 60 MPH.

0628 PM     TORNADO          8 N PLATTE              43.50N 98.84W
07/06/2010                   BRULE              SD   TRAINED SPOTTER

            TORNADO WAS ON THE GROUND, IT LIFTED MOMENTARILY AND
            APPEARED TO COME BACK DOWN AND THEN BECAME COMPLETELY
            RAIN WRAPPED.

0635 PM     HAIL             10 N PLATTE             43.54N 98.85W
07/06/2010  E2.75 INCH       BRULE              SD   PUBLIC

            WINDOWS BROKE ON NORTH SIDE OF HOUSE

0639 PM     HAIL             7 N PLATTE              43.49N 98.84W
07/06/2010  M1.00 INCH       CHARLES MIX        SD   TRAINED SPOTTER

            HAIL FALLING IN LARGE AMOUNTS, DRIVEN BY ESTIMATED 50 MPH
            WINDS.

0655 PM     HAIL             4 W HARRISON            43.44N 98.61W
07/06/2010  M1.75 INCH       DOUGLAS            SD   TRAINED SPOTTER

            GOLF BALL SIZE HAIL STRIPPED CORN.

0700 PM     HAIL             8 WNW HARRISON          43.48N 98.68W
07/06/2010  E1.75 INCH       DOUGLAS            SD   PUBLIC

0700 PM     TORNADO          9 WNW HARRISON          43.49N 98.70W
07/06/2010                   DOUGLAS            SD   STORM CHASER

            RAIN WRAPPED TORNADO ON THE GROUND.

0708 PM     HAIL             8 WNW HARRISON          43.48N 98.68W
07/06/2010  E2.75 INCH       DOUGLAS            SD   PUBLIC

0713 PM     HAIL             4 WNW HARRISON          43.46N 98.60W
07/06/2010  E1.75 INCH       DOUGLAS            SD   STORM CHASER

            QUARTER SIZED HAIL WITH A FEW AS LARGE AS GOLF BALLS.

0725 PM     TORNADO          4 WNW CORSICA           43.45N 98.48W
07/06/2010                   DOUGLAS            SD   LAW ENFORCEMENT

            CORSICA POLICE REPORTED A RAIN WRAPPED TORNADO.

0727 PM     TORNADO          3 ESE HARRISON          43.43N 98.47W
07/06/2010                   DOUGLAS            SD   TRAINED SPOTTER

            TORNADO ON THE GROUND MOVING EAST.

0735 PM     HAIL             6 ENE PUKWANA           43.81N 99.07W
07/06/2010  E1.00 INCH       BRULE              SD   PUBLIC

            MARBLE TO QUARTER SIZE HAIL COVERED THE GROUND.

0823 PM     HAIL             5 E KIMBALL             43.75N 98.86W
07/06/2010  E1.75 INCH       BRULE              SD   TRAINED SPOTTER

            PEA TO QUARTER SIZED HAIL COVERING THE GROUND, WITH A FEW
            GOLF BALL SIZE.

0825 PM     HAIL             2 N KIMBALL             43.78N 98.96W
07/06/2010  M1.00 INCH       BRULE              SD   PUBLIC

            1 INCH HAIL MAKING THE GROUND WHITE.

0910 PM     HAIL             1 W KIMBALL             43.75N 98.98W
07/06/2010  E1.00 INCH       BRULE              SD   TRAINED SPOTTER

&&

MDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:13 PM CDT	Tornado Warning	FSD	Aurora, Davison, Douglas	47 min
Jul 6, 7:30 PM CDT	Severe Thunderstorm Warning	FSD	Brule	45 min
Jul 6, 7:55 PM CDT	Tornado Warning	FSD	Aurora, Davison, Douglas, Hanson, Hutchinson	26 min
Jul 6, 8:05 PM CDT	Tornado Warning	FSD	Aurora, Brule	30 min
Jul 6, 8:10 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	30 min
Jul 6, 9:02 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	28 min
Jul 6, 9:38 PM CDT	Flash Flood Warning	FSD	Aurora, Brule	3 hr
Jul 6, 11:17 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	43 min
Jul 7, 12:23 AM CDT	Areal Flood Warning	FSD	Aurora, Beadle, Brookings, Davison, Hanson, Jerauld and 5 more	3 hr
Jul 7, 1:12 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Moody	33 min
Jul 7, 1:41 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Moody	34 min
Jul 7, 7:16 AM CDT	River Flood Warning	FSD	Brookings	6 days
Jul 7, 9:54 AM CDT	River Flood Warning	FSD	Brookings, Moody	49 hr
Jul 7, 2:21 PM CDT	Flash Flood Warning	FSD	Clay	3 hr
Jul 7, 2:25 PM CDT	Flash Flood Warning	FSD	Cherokee	3 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.