At 856 AM CDT, Doppler radar was tracking a cluster of strong thunderstorms over Rio Hondo Elementary School, or near Rio Hondo, moving northeast at 85 mph. HAZARD...Wind gusts of 50 to 55 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Harlingen, Weslaco, San Benito, Mercedes, La Feria, Progreso, Santa Rosa, Rio Hondo, Palm Valley, and Los Indios. This includes the following highways... Interstate Highway 69 E between mile markers 17 and 37. US Highway 281 between mile markers 806 and 824.