Severe Thunderstorm Warning 20, NWS Sioux Falls, SD

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1052 AM CDT FRI JUN 6 2003

MOST OF THE FORECAST VERIFYING PRETTY WELL THIS MORNING...EXCEPT FOR
SMALL AREA OF THUNDERSTORMS THAT DEVELOPED RIGHT UNDER THE UPPER LOW
JUST WEST OF SIOUX FALLS AN HOUR OR TWO AGO.  VERY LOCALIZED AND
SLOW MOVING STORM PRODUCED A COUPLE REPORTS OF PEA SIZE HAIL WEST
AND NORTHWEST OF SIOUX FALLS...WITH RAINFALL AMOUNTS UP TO 1.5
INCHES.  STILL AN AREA OF MAINLY SHOWERS FROM SIOUX FALLS SOUTHEAST
TO SIOUX CENTER IA...WITH A FEW WEAKER THUNDERSTORMS BETWEEN SIOUX
FALLS AND PIPESTONE.  WITH COVER WITH SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS THROUGH MIDDAY IN GRIDS.

OTHER AREA OF DECENT RAINFALL IN EASTERN PARTS OF NORTHWEST IOWA
CONTINUES TO BREAK UP...BUT THIS TOO PUT DOWN SOME DECENT RAINFALL
AROUND A HALF INCH OR SO IN SPENCER THROUGH 930 AM.

FOR THE REMAINDER OF THE DAY...GOING PRECIP FORECAST LOOKS ALRIGHT.
UPPER LOW SLOWLY SHIFTING EAST PER VARIOUS SATELLITE VIEWS...AND
WILL CONTINUE TO CARRY SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
ACROSS ABOUT THE NORTHERN HALF OF THE CWA...ROUGHLY NORTH OF
K9V9-KFSD-KSPW LINE.  ISOLATED ACTIVITY ALSO POSSIBLE IN THE SOUTH
WITH ADDITIONAL HEATING THIS AFTERNOON...BUT THIS AREA ALSO SEEING
GREATEST AMOUNT OF GENERAL SUBSIDENCE BEHIND UPPER LOW...SO EXPECT
BEST COVERAGE OF PRECIP TO REMAIN ACROSS THE NORTH.

RAIN AND CLOUDS HOLDING TEMPERATURES DOWN IN THE MID 50S ACROSS
SOUTHWEST MN...AND ADJACENT AREAS OF SD/IA...WHILE CLEAR AREA THRU
MOST OF THE JAMES VALLEY AND DOWN TOWARD KSUX HAS ALLOWED TEMPS TO
CLIMB INTO THE LOWER TO MID 60S AS OF 15Z.  MADE SOME ADJUSTMENTS TO
HOURLY TEMP GRIDS TO ACCOUNT FOR MORE PRONOUNCED GRADIENT...AND ALSO
LOWERED HIGHS A FEW DEGREES IN THE NORTHEAST WHERE LESS SUNSHINE IS
EXPECTED THROUGH THE AFTERNOON.

WILL NOT MAKE MANY CHANGES TO HAZ WX OTLK...AS HAS ALREADY BEEN
PROVEN THAT SMALL HAIL IS POSSIBLE WITH THE THUNDERSTORMS.  WITH
UPPER LOW MOVING OUT...AND ASSOCIATED SLIGHT RISE IN MID-UPPER LEVEL
TEMPERATURES...DO NOT SEE ENOUGH DYNAMIC SUPPORT FOR MUCH MORE THAN
THAT AT THIS TIME.

.FSD...NONE

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SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-IAZ001>003-
012>014-020>022-031-032-NEZ013-014-071200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1058 AM CDT FRI JUN 06 2003

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
SCATTERED THUNDERSTORM DEVELOPMENT IS EXPECTED TO CONTINUE
THROUGH THE AFTERNOON...WITH THE BEST CHANCE FOR THUNDERSTORMS
NORTH OF A LINE FROM CHAMBERLAIN...THROUGH SIOUX FALLS AND
SPENCER IOWA.  NO SEVERE WEATHER IS EXPECTED FROM THESE STORMS.
HOWEVER LOCALLY HEAVY RAINS AND HAIL UP TO A HALF INCH WILL BE
POSSIBLE IN THE STRONGEST STORMS THIS AFTERNOON.  ANY
THUNDERSTORM ACTIVITY SHOULD DIMINISH EARLY IN THE EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE WILL BE CHANCE OF THUNDERSTORMS ON SATURDAY AFTERNOON IN
SOUTH CENTRAL SOUTH DAKOTA..SPREADING TOWARD THE SIOUX CITY AREA
BY LATE AFTERNOON.  THE CHANCE FOR THUNDERSTORMS WILL SPREAD
ACROSS THE REMAINDER OF SOUTHEAST SOUTH DAKOTA...SOUTHWEST
MINNESOTA...AND NORTHWEST IOWA SATURDAY EVENING.  THESE STORMS
ARE NOT EXPECTED TO BECOME SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

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

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