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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
428 AM CDT WED AUG 20 2014

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-210930-
LYON IA-OSCEOLA-DICKINSON-SIOUX-OBRIEN-CLAY IA-PLYMOUTH-CHEROKEE-
BUENA VISTA-WOODBURY-IDA-LINCOLN MN-LYON MN-MURRAY-COTTONWOOD-
NOBLES-JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-BEADLE-KINGSBURY-
BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE-MOODY-BRULE-AURORA-
DAVISON-HANSON-MCCOOK-MINNEHAHA-CHARLES MIX-DOUGLAS-HUTCHINSON-
TURNER-LINCOLN SD-BON HOMME-YANKTON-CLAY SD-UNION-
428 AM CDT WED AUG 20 2014

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS ARE LIKELY THIS MORNING...MAINLY ALONG AND
SOUTH OF A CHAMBERLAIN TO STORM LAKE LINE. WIDESPREAD SEVERE WEATHER
IS NOT EXPECTED WITH THIS ACTIVITY...ALTHOUGH AN ISOLATED STORM
CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL IS POSSIBLE. HEAVY RAIN
WILL ALSO BE A THREAT WITH THESE STORMS. WIDESPREAD FLASH FLOODING IS
NOT EXPECTED...ALTHOUGH LOCALIZED FLOODING IN THE HEAVIER STORMS IS
POSSIBLE.

THE COVERAGE OF STORMS SHOULD DECREASE FROM MID MORNING INTO MID
AFTERNOON...WITH JUST AN ISOLATED STORM OR TWO EXPECTED. THUNDERSTORMS
SHOULD THEN REFORM LATER THIS AFTERNOON INTO THE OVERNIGHT. THERE IS
STILL UNCERTAINTY ON TIMING...BUT THE MOST LIKELY PERIOD FOR STORMS
IN AREAS WEST OF THE JAMES RIVER IS BETWEEN 6 PM AND 10 PM...SPREADING
TOWARDS INTERSTATE 29 AFTER 9 PM AND POINTS EAST AFTER MIDNIGHT.

SEVERE WEATHER WILL BE POSSIBLE WITH THESE STORMS LATER TODAY AND
TONIGHT...WITH LARGE HAIL AND STRONG WINDS THE MAIN THREATS. HAIL UP
TO TENNIS BALL SIZE IS POSSIBLE THIS EVENING...WITH THE GREATEST
CHANCE WEST OF INTERSTATE 29. AS STORMS MOVE EAST...HAIL SIZES MAY
DECREASE A BIT...BUT STRONG WINDS OF 60 MPH WILL STILL BE A THREAT.
AN ISOLATED TORNADO OR TWO CAN NOT BE RULED OUT AS WELL. THE GREATEST
THREAT OF THIS APPEARS TO ALSO BE WEST OF INTERSTATE 29...PROBABLY
CLOSER TO THE JAMES RIVER OR JUST WEST. HEAVY RAIN IS ALSO LIKELY
WITH ANY STORMS LATER TODAY AND TONIGHT...WITH LOCALIZED FLOODING
POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ANOTHER ROUND OF THUNDERSTORMS ARE EXPECTED FRIDAY AFTERNOON INTO
FRIDAY NIGHT. A FEW OF THESE STORMS COULD ALSO BE SEVERE...WITH HEAVY
RAIN AGAIN A THREAT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY LATER THIS AFTERNOON INTO TONIGHT.

$$







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