Expires:200909062200;Remove:200909062200;689178 FPUS75 KRIW 062119 NOWRIW SHORT TERM FORECAST NATIONAL WEATHER SERVICE RIVERTON WY 319 PM MDT SUN SEP 6 2009 WYZ001-012-062200- TETON AND GROS VENTRE MOUNTAINS-YELLOWSTONE NATIONAL PARK- INCLUDING THE CITY OF...MAMMOTH 319 PM MDT SUN SEP 6 2009 .NOW... SHOWERS AND THUNDERSTORMS CONTINUE TO MOVE NORTHEAST THROUGH NORTHERN GRAND TETON NATIONAL PARK....AND THROUGH YELLOWSTONE NATIONAL PARK THIS AFTERNOON. SHOWERS MAY CONTAIN GUSTY WIND TO 40 MPH...SMALL HAIL AND CLOUD TO GROUND LIGHTNING. OUTDOOR VISITORS IN YELLOWSTONE SHOULD FIND A STURDY SHELTER IF STORMS APPROACH THEIR AREA. $$