…SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LAMAR…NORTHEASTERN COLLIN…SOUTHEASTERN GRAYSON AND FANNIN COUNTIES UNTIL 930 PM CST… At 842 PM CST, Doppler radar was tracking a strong thunderstorm 7 miles east of Anna, or 18 miles northeast of McKinney, moving northeast at 70 mph. Nickel size hail will be possible with this storm.