Summer may be coming to an end, but a mid-summer-like blast of heat is hitting the Southland Wednesday, and it will persist into Thursday before a cooling trend begins.
A heat advisory issued by the National Weather Service for Pasadena will be in effect until 8 p.m. Wednesday.
The heat roller coaster will climb to triple digits Wednesday then plunge to 89 on Thursday, NWS forecasters said.
Conditions should change beginning Thursday, with a return of onshore flow and the arrival of a low-pressure system that will likely cool temperatures into Sunday.
Forecasters warned residents to take precautions if they are outside in the heat, such as drinking plenty of liquids, avoiding prolonged exposure to the sun and checking on vulnerable relatives and neighbors.
Here is the detailed forecast from the National Weather Service:
Wednesday: Sunny and hot, with a high near 102. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon.
Wednesday Night: Mostly clear, with a low around 65. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Thursday: Sunny, with a high near 89. South wind around 5 mph.
Thursday Night: Mostly clear, with a low around 62. South southwest wind 5 to 10 mph becoming southeast in the evening. Winds could gust as high as 15 mph.
Friday: A 20 percent chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 86.
Friday Night: Partly cloudy, with a low around 59.
Saturday: Mostly sunny, with a high near 84.
Saturday Night: Partly cloudy, with a low around 58.
Sunday: Mostly sunny, with a high near 82.
Sunday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 57.
Monday: Patchy fog. Otherwise, mostly sunny, with a high near 78.
Monday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 56.
Tuesday: Patchy fog. Otherwise, partly sunny, with a high near 78.