SoCal forecast: Dallas Raines on how hot it will get Labor Day weekend

730, FOLLOWING JEOPARDY! IN THE MEANTIME, FOR THE REST OF US, WE ARE ALL HEADING INTO THE LABOR DAY WEEKEND HOPING FOR GREAT WEATHER. >> THE WEATHER IS GOING TO BE FANTASTIC. DAVID. IT'S GOING TO START GETTING HOT AROUND LABOR DAY AND BEYOND THAT, I'LL SHOW YOU THAT SEVEN DAY IN JUST A SECOND. WE DID HAVE SOME BUILD UP OF CLOUDS TODAY ACROSS SOUTHERN CALIFORNIA. THUNDERSTORMS HAVE BEEN RUMBLING AROUND OUT THERE JUST WEST OF HAVASU CITY. IF YOU'RE TRAVELING TOMORROW OUT ALONG THE 40, LOOK FOR THOSE. AND ALSO, IF YOU'RE GOING UP TO VEGAS, THERE'S A CHANCE OF AFTERNOON THUNDER. A LITTLE CLOSER TO HOME, WE'VE HAD SOME AFTERNOON SHOWERS AND EVEN SOME THUNDER SHOWERS. AND AROUND THE BIG BEAR LAKE AREA, AND I AM FORECASTING THAT TO HAPPEN AGAIN TOMORROW. SO IT'S BETWEEN ABOUT 1:00 IN THE AFTERNOON AND ABOUT 6:00, AND THEN EVERYTHING STARTS TO DISSIPATE. THESE ARE CALLED PULSE THUNDERSTORMS. THEY'RE DRIVEN BY THE SUN. SO AS THE SUN GOES DOWN, THOSE THERMALS DECREASE AND YOU HAVE LESS THUNDER. AIR QUALITY. THIS AFTERNOON, SOME POOR AIR QUALITY WAS SHOWING UP OUT IN THE EYE AREA FOR A WHILE. ACTON HIT 103 DEGREES TODAY. WOODLAND HILLS 95. NOT TOO BAD, BUT NEXT WEEK WE'LL SEE TEMPERATURES AT WOODLAND HILLS APPROACHING 105 TO 107 DEGREES. AND HERE'S WHY. HIGH PRESSURE IS BUILDING IN OFF TO THE EAST OF US. AND TODAY WE SAW THAT MOISTURE STARTING TO FEED IN FROM THE SOUTHEAST. IF YOU'RE LIVING IN BIG BEAR IDLEWILD, YOU NOTICED AROUND NOON TODAY THOSE CUMULUS CLOUDS FORMING AND A FEW DID DEVELOP INTO THUNDERSTORMS. THAT WILL HAPPEN AGAIN TOMORROW. SO WE'LL STILL HAVE THAT SOUTHEASTERLY SURGE TOMORROW. AND THEN AS WE ZOOM OUT, YOU'RE GOING TO SEE THIS DOME OF HIGH PRESSURE. THIS IS THE ONE THAT'S BUILDING IN FROM THE SOUTHWEST. AND WILL BE RIGHT OVER SOUTHERN CALIFORNIA MONDAY, TUESDAY AND BEYOND. ONCE IT GETS HERE, IT'S JUST GOING TO HANG AROUND. AND THAT HIGH IS GOING TO BE A POWERFUL ONE TO PRODUCING SOME HOT WEATHER TONIGHT. MOUNTAINS DOWN TO 50. AFTER THOSE FEW CUMULUS CLOUDS EVAPORATE. HIGH DESERT 63. LOW DESERT 82. THE HIGHS FOR YOUR SATURDAY AFTERNOON INCLUDE 96 AT RIVERSIDE. IRVINE. DOWN ALONG THE COAST. NOT A BAD DAY AT ALL. ANAHEIM IF YOU'RE HEADED TO DISNEYLAND, 84 DOWNTOWN, 85, PASADENA ABOUT 91. SO IT'S A HOTTER DAY THAN WE'VE HAD THE PAST 2 OR 3 DAYS. BUT THE REAL HEAT REALLY DOESN'T GET GOING UNTIL LABOR DAY, WHEN DOWNTOWN HITS 90 AND IT STAYS HOT ALL WEEK LONG, REACHING A MAXIMUM AROUND THURSDAY OR FRIDAY WITH VALLEY TEMPERATURES FROM 95 AT BURBANK, 98 ALL THE WAY UP TO 105 DEGREES. WEDNESDAY THURSDAY AND FRIDAY. IT IS GOING TO HANG AROUND A WHILE, AND OVERNIGHT LOW TEMPERATURES ARE GOING TO BE HOT TOO. SO WE'RE GOING TO GO BACK UP INTO THE 60S AND 70S FOR OVERNIGHT LOWS, SOMETHING WE HAVEN'T SEEN FOR A WHILE SINCE JULY. NOW FOR THE BEACHES. STILL A SEA BREEZE WORKING AT THE COASTLINE WITH HUNTINGTON BEACH AT 75 TOMORROW. BUT PLACES LIKE LAGUNA BEACH ON TUESDAY, WEDNESDAY AND THURSDAY WILL BE AT 80 DEGREES RIGHT AT THE SAND SURFERS. NOT A LOT OUT ON THE WATER FOR YOU OVER THE WEEKEND. SOUTHWEST SWELL OF 2 TO 3 FOOT BREAKERS. WATER TEMPERATURES. NICE THOUGH IN THE MOUNTAINS. SLIGHT CHANCE OF THUNDER TOMORROW AT THE BIG BEAR 80. YOU CAN SEE THOSE BILLOWING CLOUDS THERE. 81 SUNDAY. NO THUNDER MONDAY AND THEN JUST BEAUTIFUL WEATHER UP IN THE HIGH COUNTRY AND IN THE DESERT AREAS. 102, 103, 103 BUT NOTICE