Forecast for this afternoon:  Mostly sunny and hot, with a high near 94. Heat index values as high as 109. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.  Tonight:  A 50 percent chance of showers and thunderstorms, mainly between 10pm and 1am.  Partly cloudy, with a low around 73. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 35 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.  Tuesday:  A slight chance of showers between noon and 1pm.  Mostly sunny, with a high near 92. Heat index values as high as 96. Southwest wind 5 to 10 mph.  Chance of precipitation is 20%.