Severe Thunderstorm Warning 159, NWS Sioux Falls, SD

000 
WWUS53 KFSD 162057
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
353 PM CDT MON JUL 16 2007

MNC081-SDC011-162115-
/O.CON.KFSD.SV.W.0159.000000T0000Z-070716T2115Z/
LINCOLN MN-BROOKINGS SD-
353 PM CDT MON JUL 16 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT 
FOR BROOKINGS AND WESTERN LINCOLN COUNTIES...

AT 353 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER TO HALF 
DOLLAR SIZE HAIL...AND DAMAGING WINDS AROUND 60 MPH.  THE CORE OF 
THE STORM WAS LOCATED 5 MILES NORTHEAST OF BUSHNELL...OR ABOUT 12 
MILES NORTHEAST OF BROOKINGS...MOVING SOUTHEAST AT 35 MPH. A LINE OF 
STORMS EXISTED FROM NEAR VOLGA...TO RURAL WEST CENTRAL LINCOLN 
COUNTY MINNESOTA. 

THE SEVERE THUNDERSTORM WILL BE NEAR...
   ELKTON AROUND 405 PM CDT...
   LAKE BENTON AROUND 410 PM CDT...

AT 340 PM...HALF DOLLAR SIZED HAIL WAS REPORTED 6 MILES NORTH TO 
NORTHWEST OF WHITE SOUTH DAKOTA. SMALLER PEA SIZED HAIL WAS REPORTED 
IN VOLGA AT 345 PM. AT 355 PM...DIME SIZED HAIL WAS REPORTED IN 
BROOKINGS. 

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR NORTHWEST IOWA.

LAT...LON 4453 9658 4437 9699 4429 9700 4421 9653
      4423 9610

$$

MJF

000 
WWUS53 KFSD 162114
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
414 PM CDT MON JUL 16 2007

MNC081-SDC011-162124-
/O.EXP.KFSD.SV.W.0159.000000T0000Z-070716T2115Z/
LINCOLN MN-BROOKINGS SD-
414 PM CDT MON JUL 16 2007

...THE SEVERE THUNDERSTORM WARNING FOR BROOKINGS AND WESTERN LINCOLN 
COUNTIES EXPIRES AT 415 PM CDT...

THE STORM HAS WEAKENED AND APPEARS TO BE NO LONGER SEVERE.

LAT...LON 4453 9658 4437 9699 4429 9700 4421 9653
      4423 9610

$$

MJF

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1000 AM CDT MON JUL 16 2007

.DISCUSSION...
HAVE UPDATED THE WX/POP GRIDS FOR TODAY AND TONIGHT. SFC BOUNDARY
EXISTS CURRENTLY FM SRN MN TO EXTREME NWRN SD. FAIRLY VIGOROUS S/W
IS WORKING ITS WAY SEWD THRU ND...WITH THE CRUX OF THE WAVE IN WRN
ND. TS REMAINS ON GOING IN ND...ESP NEAR THE JAMESTOWN AREA MOVG SE.
DECIDED TO ADD SOME POPS ACROSS OUR NRN AND ERN AREAS FOR THIS AFTN
AND TONIGHT TO ACCOUNT FOR THE PASSING THRU OF THIS S/W COUPLED WITH
THE SFC-H85 BOUNDARY. HOW MUCH THIS BOUNDARY WL SAG SWD WL LARGELY
DEPEND ON CONVECTIVE DEVELOPMENT. ATMOSPHERE IS RATHER UNSTABLE NEAR
THE BOUNDARY...AND ALSO IN OUR SERN CWFA AROUND THE SIOUX CITY AREA
LATE TODAY AND THIS EVENING. MOISTURE CONVERGENCE IS STRONG...AS
WELL AS LOW LEVEL FRONTOGENESIS NEAR THE BOUNDARY. BUT I ALSO
DECIDED TO ADD A SMALL POP IN THE YANKTON AND SIOUX CITY AREAS THIS
EVENING. THIS IS BECAUSE OF THE STRONG INSTABILITY IN THOSE AREAS
COUPLED WITH THE CORFIDI VECTORS POINTING IN A NNW TO SSE DIRECTION.
SO IF ANYTHING DOES DEVELOP IN E CENTRAL SD...IT COULD DRIFT DOWN AS
FAR WEST AS THOSE TWO AREAS EVEN THOUGH THEIR FOCUS MECHANISM IS
WEAKER. AS FAR AS UPPER AIR RAOBS...BOTH THE KABR AND KBIS SNDGS
SHOW STEEP LAPSE RATES FM H9-H7...AND FAIRLY COOL H7 TEMPS EXISTS
EXCEPT IN OUR SWRN FA. MOISTURE AT H85 IS NOT TOO BAD EITHER. NOT
SURE IF THE CURRENT TS NEAR KJMS ND WL HOLD TOGETHER AS IT HAS RUN
OUT AHEAD OF THE MAIN WAVE. BUT AM MORE WORRIED ABOUT WHAT MAY
DEVELOP CLOSER TO THE MAIN WAVE.

MAX TEMPS ARE A BIT PROBLEMATIC TODAY. OVERALL THEY DO NOT LOOK TOO
BAD BUT MAY HAVE TO NUDGE THEM DOWN JUST A TAD HERE AND THERE WITH
SOME HIGH LEVEL DEBRIS CLOUDS MOVG SEWD.

&&

.PREV DISCUSSION...
THE FRONT LOOKS LIKE IT WILL MEANDER OVER OUR NORTH THROUGH AT LEAST
TUESDAY...BEFORE FINALLY PUSHING THROUGH SOMETIME ON WEDNESDAY...
FOLLOWED BY A SECONDARY FRONT SOMETIME ON THURSDAY. BECAUSE OF THE
HIGH UNCERTAINTY ON TIMING AND PLACEMENT OF FEATURES...WAS RATHER
HARD TO PIN POINT AN EXACT TIMING ON ANY PRECIPITATION CHANCES FOR
AT LEAST THE NEXT COUPLE OF DAYS...THOUGH IT CAN NOT BE RULED OUT
THAT CONVECTION COULD DEVELOP SOMEWHERE OVER THE AREA WITH A
BOUNDARY SO CLOSE BY. WITH STRONG UPPER LEVEL RIDGING HOLDING OVER
THE REGION...WHAT SEEMS MORE CERTAIN IS THAT IT WILL BE HOT THROUGH
MIDWEEK...WITH HIGHS IN THE LOWER TO MID 90S OVER MOST OF THE CWA.
BETTER SHOT OF PRECIPITATION MAY COME WITH SECONDARY FRONT ON
THURSDAY...FOLLOWED BY SLIGHTLY COOLER TEMPERATURES FOR THE END OF
THE WEEK.

&&

AVIATION...
TAF SITES WL REMAIN VFR THRU THE 24HR PERIOD. HOWEVER BE ALERT FOR
ANY ISOLD TS DEVELOPMENT WHICH COULD OCCUR EITHER LATE THIS PM OR
EVENING.

&&

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

 MJF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1142 AM CDT MON JUL 16 2007

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-171200-
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-
1142 AM CDT MON JUL 16 2007

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS
AFTERNOON AND THROUGH ABOUT MIDNIGHT...GENERALLY ALONG AND EAST
OF A HURON SOUTH DAKOTA TO YANKTON SOUTH DAKOTA LINE. THE MAIN
THREAT WOULD BE LARGE HAIL UP TO ABOUT THE SIZE OF QUARTERS OR
SLIGHTLY LARGER...AND WIND GUSTS TO 60 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 6 PM ALONG AND EAST
OF A YANKTON TO HURON SOUTH DAKOTA LINE.

&&

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
314 PM CDT MON JUL 16 2007

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

0255 PM     TSTM WND GST     10 N ELKTON             44.38N 96.48W
07/16/2007  E60 MPH          BROOKINGS          SD   TRAINED SPOTTER

            PEA SIZED HAIL AND BRANCHES DOWN

&&

GHARMON