Tornado Warning 47, NWS Sioux Falls, SD

420 
WWUS53 KFSD 272214
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
514 PM CDT TUE JUL 27 2010

SDC005-272230-
/O.CON.KFSD.TO.W.0047.000000T0000Z-100727T2230Z/
BEADLE SD-
514 PM CDT TUE JUL 27 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN BEADLE COUNTY
UNTIL 530 PM CDT...

AT 514 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR CAVOUR...OR 8 MILES EAST OF HURON...MOVING
EAST AT 35 MPH.

THIS TORNADO WILL AFFECT MAINLY RURAL AREAS OF SOUTHEASTERN BEADLE
COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

&&

LAT...LON 4431 9818 4438 9816 4448 9811 4445 9786
      4420 9786 4420 9804
TIME...MOT...LOC 2214Z 284DEG 31KT 4435 9801

$$

LIEBL

086 
WWUS53 KFSD 272228
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
528 PM CDT TUE JUL 27 2010

SDC005-272239-
/O.EXP.KFSD.TO.W.0047.000000T0000Z-100727T2230Z/
BEADLE SD-
528 PM CDT TUE JUL 27 2010

...THE TORNADO WARNING FOR SOUTHEASTERN BEADLE COUNTY WILL EXPIRE AT
530 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY...HOWEVER HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS 
THUNDERSTORM.

LAT...LON 4431 9818 4438 9816 4448 9811 4445 9786
      4420 9786 4420 9804
TIME...MOT...LOC 2229Z 284DEG 31KT 4432 9783

$$

LIEBL

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
343 PM CDT TUE JUL 27 2010

.DISCUSSION...
FOCUS FOR TONIGHT ON APPROACHING COLD FRONT. CU FIELD AND FINE LINES
ON UPSTREAM RADAR IMAGERY INDICATE VARIOUS SURFACE BOUNDARIES POISED
JUST TO THE NORTHWEST OF THE CWA AT 20Z. NOT SEEING ANYTHING TOO
IMPRESSIVE IN CU FIELD AS OF YET IN NORTHEAST SOUTH DAKOTA...BUT
BOUNDARY IS PUSHING INTO DEEPER MOISTURE SO STILL EXPECTING SOME
DEVELOPMENT ALONG THE BOUNDARY THIS EVENING...SLIDING SOUTHEAST WITH
THE BOUNDARY THROUGH MAINLY THE NORTHEAST HALF OF THE CWA THROUGH
ABOUT 09Z. HRRR (HI-RES RAPID REFRESH) MODEL HAS BEEN CONSISTENT IN
DEVELOPING SCATTERED CONVECTION INTO OUR NORTHWEST AROUND 22Z...WITH
CONVECTION BECOMING MORE WIDESPREAD OVER SOUTHWEST MINNESOTA AFTER
28/01Z AS BOUNDARY REACHES SLIGHTLY LESS CAPPED AIRMASS. ISOLATED
SEVERE STORMS POSSIBLE...WITH MAIN THREAT BEING WIND GIVEN DEEP WARM
LAYER TO LIMIT LARGE HAIL THREAT. HRRR ALSO APPEARS TO WANE MORE
WIDESPREAD SURFACE BASED CONVECTION BY 04Z OR SO...WITH LIGHTER AND
MORE SCATTERED ELEVATED CONVECTION DEVELOPING FARTHER NORTHWEST AS
THE MID LEVEL FRONT PUSHES INTO THE AREA. THIS LIGHT ACTIVITY HAS
BEEN ONGOING WELL TO OUR NORTHWEST...AND WHILE THREAT OF SEVERE
WEATHER AND HEAVY RAIN SHOULD DIMINISH...WOULD STILL EXPECT SOME
LIGHT-MODERATE SHRA/TSRA TO BE AROUND. WILL KEEP LIKELY POPS GOING
ACROSS THE NORTHEAST THIS EVENING WITH A MENTION OF ISOLATED SEVERE
AND HEAVY RAIN...WITH LIKELY POPS EXTENDING INTO THE EARLY PART OF
THE OVERNIGHT...TAPERING AFTER 09Z AS SUPPORT FOR EVEN THE ELEVATED
CONVECTION EXITS TO THE SOUTHEAST. DRIER AIR STARTS TO FILTER IN
BEHIND THE FRONT BY DAYBREAK...WITH OVERNIGHT LOWS RANGING FROM NEAR
60 NORTHWEST IN THE CWA...TO AROUND 70 IN THE SOUTHEAST.   /JH

LOOKING AT A MUCH NICER WED FOLLOWING COLD FRONTAL PASSAGE TONIGHT.
SFC HIGH PRESSURE NUDGING INTO THE AREA WILL MAKE FOR LIGHT WINDS
AND PRODUCE CLEAR TO PARTLY CLOUDY SKIES. TODAYS 70+ DEGREE DEW
POINTS WILL BE REPLACED BY MORE REASONABLE 60 DEGREE DEW POINTS...
MAKING IT FEEL MUCH MORE COMFORTABLE. CHANCES FOR THUNDERSTORMS WILL
BE WELL SOUTH OF THE CWA ALONG THE STALLED OUT COLD FRONT ACROSS SRN
NE AND SRN IA. HIGH PRESSURE AXIS WILL REMAIN OVER THE AREA WED
NIGHT...KEEPING SKIES ON THE CLEAR SIDE AND ALLOWING TEMPERATURES TO
DIP INTO THE 50S IN MANY PLACES.

CHANCES FOR THUNDERSTORMS BEGIN TO RETURN LATE THU AS A COLD FRONT
PUNCHES ACROSS THE AREA. SOME DISAGREEMENT WILL THE MODELS AS FAR AS
TIMING...BUT GENERAL CONSENSUS IS FOR EVENING AND OVERNIGHT
THUNDERSTORMS. SHOULD STORMS DEVELOP...A FEW COULD BE SEVERE
SIDE...BUT AT THIS TIME THE SEVERE THREAT LOOK MINIMAL. KEPT IN SOME
MENTION OF THUNDERTORMS FRIDAY BUT MOST LIKELY THUNDERSTORMS WILL BE
OUT OF THE FORECAST AREA. SHOULD BE ABLE TO DROP MENTION OF
THUNDERSTORMS FRIDAY SHOULD THE NEXT RUN OF MODELS REMAIN ON THE DRY
SIDE. OTHERWISE DRY THROUGH MUCH OF THE WEEKEND...WITH THE NEXT
DECENT CHANCE OF THE THUNDERSTORMS INTO SUNDAY NIGHT. /97

&&

.AVIATION...
SCT TSRA WL DEVELOP N OF I90 ALONG A CDFNT AFTER 22Z AND THEN SPREAD
SLOWLY SEWD THRU 06Z. OCNL MVFR CIGS AND VSBYS WITH THE TSRA. MOST
TSRA EXPECTED TO EXIT NWRN IA BY 09Z...FOLLOWED BY DRY NORTHWEST
WINDS AROUND 10KTS OR LESS AND VFR CONDITIONS THROUGH WEDNESDAY. /JH

&&

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

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1153 AM CDT TUE JUL 27 2010

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-281200-
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-
1153 AM CDT TUE JUL 27 2010

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG A STRONG
COLD FRONT THAT WILL MOVE THROUGH THE AREA TONIGHT. SOME OF THE
STRONGER STORMS IN THE LATE AFTERNOON MAY BE ABLE TO PRODUCE HAIL
TO THE SIZE OF QUARTERS AND WIND GUSTS IN EXCESS OF 60 MPH. THIS
WILL BE MOST LIKELY ALONG THE HIGHWAY 14 CORRIDOR IN EASTERN
SOUTH DAKOTA...THOUGH ISOLATED SEVERE STORMS ARE POSSIBLE AS FAR
SOUTH AS INTERSTATE 90.

AS THE EVENING PROGRESSES...THE STORMS ARE EXPECTED TO EVOLVE
INTO A LINE. ONCE THIS OCCURS...THEY WILL BE CAPABLE OF PRODUCING
WIND GUSTS IN EXCESS OF 70 MPH ALONG WITH HAIL TO THE SIZE OF
QUARTERS.  THIS  IS EXPECTED TO OCCUR MAINLY ALONG AND EAST OF
INTERSTATE 29 FROM SIOUX FALLS TO BROOKINGS...AND ACROSS
SOUTHWEST MINNESOTA INTO NORTHWEST IOWA NORTH OF HIGHWAY 18
DURING THE EVENING HOURS.

FLOODING...
HEAVY RAINFALL LAST WEEK HAS PRODUCED AREAS OF RIVER FLOODING
ALONG THE VERMILLION...BIG SIOUX AND LITTLE SIOUX. FLOODING
CONTINUES ALONG THE JAMES RIVER.

EXCESSIVE TEMPERATURES...
HOT AND HUMID CONDITIONS WILL CAUSE HEAT INDICES WILL RISE TO 100
TO 105 DEGREES THIS AFTERNOON ALONG AND SOUTH OF A LINE FROM
TYNDALL SOUTH DAKOTA...TO SIOUX FALLS TO WINDOM MINNESOTA.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS ARE POSSIBLE THURSDAY NIGHT...MAINLY ALONG AND EAST
OF THE JAMES RIVER VALLEY. SOME OF THESE STORMS MAY BE SEVERE
PRODUCING LARGE HAIL TO THE SIZE OF HALF DOLLARS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 5 PM ALONG HIGHWAY 14
IN EASTERN SOUTH DAKOTA...AND AFTER 7 PM ACROSS SOUTHWEST
MINNESOTA AND FAR NORTHWEST IOWA.

&&

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