The extreme heat watch search is tied to a National Weather Service warning for Southern California, where inland and desert locations could see temperatures well above normal from Tuesday through Friday. The alert covers several forecast areas, with the highest values expected away from the coast.

The NWS forecast lists possible highs of up to 112 degrees in the Antelope Valley and nearby inland locations. Parts of the Apple and Lucerne valleys could reach 108 degrees, while some Los Angeles and Oxnard areas could approach 100 degrees during the watch period.

The agency has also issued a heat advisory for some locations before the watch begins. That timing matters because people may face hazardous conditions over several days rather than during one afternoon, and warm overnight temperatures can limit recovery from daytime heat.

Another Southern California forecast account described the event as a new heat wave and said the most intense conditions were expected in the middle of the week. Local temperatures will vary by elevation, coast, valley and desert, so residents should check the forecast office serving their address.

The NWS advises people to drink water, use air-conditioned spaces when possible, avoid strenuous activity during the hottest period and check on vulnerable relatives and neighbours. Never leave a child or pet in a parked vehicle, even for a short time.

Heat alerts can be adjusted as forecast confidence changes. The latest NWS bulletin and local emergency alerts should take priority over an older screenshot or general temperature map, particularly for anyone deciding whether to travel or work outdoors.