 Meantime, as temperatures have likely peaked for the day, we have the risk of shower and thunderstorm activity. A severe thunderstorm watch in effect until 10 o'clock tonight with the potential of some periods of heavy rainfall. Mainly tonight, stays mostly cloudy, low around 77. Then tomorrow, the heat gets turned up again, mostly sunny, high near 95. Heat index values as high as 103. An excessive heat warning until 8 tomorrow night. Chance of a shower or thunderstorm redeveloping about this time tomorrow as well and tomorrow evening.