We have a couple more warm and sunny days to finish off the work week before a trough of low pressure brings in a cool and breezy weekend. The high temperature on Thursday and Friday will be in the mid to upper 80s respectively, but late Friday the winds will start to pick up ahead of the trough, and by Saturday the temperatures will drop into the 70s with gusty winds that will create likely Red Flag Fire conditions. After the trough passes through on Monday, highs will return to the 80s for next week.
Yesterday I talked about the meteorological standard… the barometer, which measures air pressure. But why do we even care about this? By measuring the pressure of the air not only at different locations but also at different times, we can pin down where high and low pressure systems are located, and where they are moving. And with any single barometer, the exact pressure measured isn’t as important as the trend…whether rising or falling. A falling barometer indicated a low is moving in, a rising trend indicates a high building.
It’s also critical that any barometer is calibrated for its elevation. I’ll tell you why this is important tomorrow.