The National Weather Service has issued a SIGNIFICANT WEATHER ADVISORY until 7:00 pm for the following counties:   Southeastern Hempstead North Central Lafayette Southern Nevada At 618 PM CDT, Doppler radar was tracking a strong thunderstorm near Lewisville, moving northeast at 30 mph. Winds in excess of 30 mph will be possible with this storm. Locations impacted include: Hope, Lewisville, Emmet, Perrytown, Rosston, Willisville, Bodcaw, Cale, Patmos, Oakhaven, Sutton, Falcon, Mount Moriah, Morris, Piney Grove and Laneburg.   A Severe Thunderstorm Watch remains in effect until 900 PM CDT for southwestern Arkansas.