Severe gusts (60 to 85mph) will likely become more prevalent and widespread as the squallline matures through the late morning. The severe thunderstorm watch area is approximately along and 100statute miles north and south of a line from 30 miles west southwestof Dubuque IA to 80 miles east of Marseilles IL. For a completedepiction of the watch see the associated watch outline update(WOUS64 KWNS WOU3). PrecautionsA Severe Thunderstorm Watch means conditions arefavorable for severe thunderstorms in and close to the watch area. Severe thunderstorms can and occasionally do producetornadoes.