TONIGHT:   The skies will be partly to mostly cloudy with a chance of raindrops in the early morning hours of Saturday.  The S-SW winds will range from 10-20 mph with occasional gusts, and the low will drop to 62.  FORECAST:   Weather Authority Alert:  KTSM has issued a Weather Authority Alert for Saturday due to the potential for showers and t-showers, which could bring some brief, heavy rainfall.  Saturday will bring a powerful low-pressure system over Arizona.  Expect partly to mostly cloudy skies with scattered showers and isolated t-storms (non-severe).  The S-SE winds will range from 10-35 mph, and the high will be a cooler 78.  Sunday will start out with clouds but turn partly cloudy to mostly sunny by the afternoon.  The warm SW winds will range from 10-30 mph, and the high will be 83.  Monday will be sunny with light winds and a high of 85. Monday will be sunny and 85. Tuesday will be partly cloudy and 89.  Wednesday will be sunny and way above normal with a high of 89.  On Thursday, a mild "cool front" blows in with stronger gusts on the west slopes of the mountains.  Thursday's high: 84.