Showers this morning among several waves the next several days. Drier periods limited as wet weather rules into the weekend. Also stays quite cool with highs around 60 today and Saturday.
Less rainy and milder by later weekend.
Full forecast at https://t.co/gchUVkKtMA
(Photo by Brian Paeth)
A disturbance in the atmosphere passing nearby Thursday evening will produce some showers and could spark some thunderstorms, mainly between 6 p.m. and 1 a.m. If there is thunder, it could be quite loud due to the relatively cool air we have in place at ground level. Here's why:
Typically thunderstorms form in warmer weather, when the air higher up in the atmosphere is cooler than near the ground. Cool air is heavier than warm air, so when cool air sits above warm air, the air masses easily mix with each other as the cool air sinks and warm air rises. That allows sound waves to travel up and away from the ground more quickly.
But every once in a while it's possible for thunderstorms to form in cooler weather, when the air higher up in the atmosphere is warmer than near the ground, a situation known as a temperature inversion. Warm air is lighter than cool air, so when warm air sits above cool air, the warm air remains layered on top of the cool air rather than mixing, which tends to trap sound waves closer to the ground.
The trapped sound waves result in thunder sounding louder and lingering longer.
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