"Air descends to the ground and heats up, and the sinking air acts like a lid, trapping warmer air close to the ground. This heat dome is impacting much of the West and desert Southwest, and records are expected to be broken in Los Angeles and Phoenix as well."
"If the high temperatures get to 84 degrees or above each day this week, the Chronicle notes that this would mark the longest stretch of that kind of hot weather in any month in SF since the city's main weather station moved to the Mission District in 2007."
"The National Weather Service is also warning that people should be careful doing anything outside, because our bodies are not as acclimated to warm temperatures as they would be later in the year. This is our first major heatwave of the year and it is going to be a marathon."
San Francisco is experiencing an exceptionally rare and prolonged heat wave in March, with temperatures expected to reach 84 degrees or higher daily through Friday. If sustained, this would mark the longest stretch of such heat since the weather station moved to the Mission District in 2007. Forecast highs are among the top ten hottest March days ever recorded, with Tuesday potentially breaking the all-time March record at 88 degrees. A heat dome—an area of high atmospheric pressure—is causing this phenomenon across the West and Southwest. The sinking air acts as a lid, trapping warm air near the ground. Phoenix is expected to reach 100 degrees a week earlier than its previous record. The National Weather Service warns people to exercise caution outdoors, as bodies are not yet acclimated to warm temperatures.
Read at sfist.com
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