Severe storm threat wanes as heavy rain falls overnight

AUSTIN (KXAN) -- Following a brush with severe weather Thursday night, the threat of severe, damaging thunderstorms is decreasing as cooler air moves into the area.A Severe Thunderstorm Watch is set to expire at 1 a.m. Thursday for portions of the viewing area. Heavy rain may add up to 1-3" in some areas where storms linger overnight, including Austin. Minor urban flooding may result.Golf ball size hail fell in Dripping Springs from a brief severe thunderstorm just before 8 p.m., and quarter siz