BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1014 PM CDT MON JUN 20 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
WESTERN CLAY COUNTY IN NORTHWEST IOWA…
WESTERN DICKINSON COUNTY IN NORTHWEST IOWA…
LYON COUNTY IN NORTHWEST IOWA…
O’BRIEN COUNTY IN NORTHWEST IOWA…
OSCEOLA COUNTY IN NORTHWEST IOWA…
NORTHERN SIOUX COUNTY IN NORTHWEST IOWA…

* UNTIL 1100 PM CDT

* AT 1014 PM CDT…NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM ROCK VALLEY TO SUTHERLAND…AND MOVING
NORTH AT 45 MPH.

IN ADDITION BRIEF CIRCULLATIONS HAVE BEEN OCCURING ALONG THIS LINE
OF THUNDERSTORMS. THESE CIRCULATIONS ARE CAPABLE OF PRODUCING
ENCHANCED WINDS OF UP TO 80 MPH AND BRIEF TORNADOES.

* SEVERE THUNDERSTORMS WILL BE NEAR…
INWOOD…SHELDON…ROYAL AND GREENVILLE AROUND 1020 PM CDT…
SANBORN…MATLOCK…DOON AND ALVORD AROUND 1025 PM CDT…
SPENCER…HARTLEY AND EVERLY AROUND 1030 PM CDT…
LESTER…LARCHWOOD…ROCK RAPIDS AND MELVIN AROUND 1035 PM CDT…
FOSTORIA AROUND 1040 PM CDT…
SIBLEY AND LITTLE ROCK AROUND 1045 PM CDT…
WEST OKOBOJI AND WAHPETON AROUND 1050 PM CDT…

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE ROSSIE
AND MONETA.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

THESE STORMS HAVE EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY…IF A TORNADO IS SPOTTED…ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE…SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT TUESDAY MORNING
FOR NORTHWESTERN IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA
AND SOUTHEASTERN SOUTH DAKOTA.