UPDATE: SIGNIFICANT WEATHER ADVISORY UNTIL 4:30PM MDT MON ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWEST JOHNSON... NORTHWESTE NATRONA AND SOUTHEAST WASHAKIE COUNTIES UNTIL 430 PM MDT... AT 405 PM MDT, DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES SOUTHWEST OF RED WALL, WHICH IS 36 MILES SOUTHWEST OF KAYCEE, MOVING NORTH AT 45 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEAST JOHNSON...NORTHWEST NATRONA AND SOUTHEAST WASHAKIE COUNTIES, INCLUDING THE FOLLOWING LOCATIONS: BARNUM.

PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM, AND MAY LEAD TO LOCALIZED FLOODING.  A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT FOR CENTRAL AND NORTH CENTRAL WYOMING. 

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SEVERE THUNDERSTORM WATCH from 2:45pm Mon until 10pm Mon WY. Wyoming counties included are Big Horn, Hot Springs, Johnson, Natrona, Park, Sheridan and Washakie.

"AT 243 PM MDT, DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 15 MILES NORTHWEST OF TEAPOT ROCK, WHICH IS 26 MILES SOUTH OF KAYCEE, MOVING NORTH AT 55 MPH. DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... KAYCEE AROUND 310 PM MDT.

THIS INCLUDES INTERSTATE 25 BETWEEN MILE MARKERS 211 AND 256. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT FOR CENTRAL AND NORTH CENTRAL WYOMING."