Kevin Selle
Wichita Falls, TX
Male, 55
I've been a broadcast meteorologist on television since the early 1990's. Happy to answer any questions about the weather or local TV news. Yes, I often wear sneakers on set just out of view of the camera.
Great question, Judith. I must say I'm not really familiar with SF climatology. In general air pressure changes with the movement of weather systems so a short move might not have a big effect. But local topography could come into play. I'll suggest your local National Weather Service office would find your question interesting. Good luck! Contact info at the bottom. http://www.weather.gov/mtr/
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You could make that argument, Pamela. The amount of moisture in the air can be a function of the direction of the wind and a moisture source. Where I live, in Texas, for example, a southeast wind will bring moisture from the Gulf of Mexico and make it feel more humid. Thanks!
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Good question, Boyd. When we talk about a high pressure ridge and low pressure trough you can think about those like a hill and valley in the atmosphere. Irma is moving around the edge of the mountain (high) since it can't climb it and the computer forecast models are showing a valley (low) to the north of Florida so it will move to flow toward the valley (downhill). Still some very limited chance for changes, stay tuned.
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Yup! Not too crazy. The rain has to start and stop someplace, why not over your house?! Thanks!
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So sorry about that! Yes, lightning can travel many feet away from the strike point as the energy dissipates. The explosion could have been a pressure build-up from the water boiling rapidly and increasing the pressure, the bolt can reach 50,000 degrees. https://www.weather.gov/safety/lightning-science-ground-currents
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Yes. But some would disagree.
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Complicated answer, Richard, but a good question. There are quite a few and I really can't give a number off the top of my head. Easily more than a dozen It is complicated because different models offer different solutions. Some are short range, some are longer range. Some are US based, others European and Canada and Japan. To further complicate the issue some models are run as "ensembles" meaning they are run from the basic initial data but small variations are introduced to give different solutions. The basic input data is collected twice a day from about 900 upper air sites, or weather balloons, launched twice a day, noon and midnight Greenwich mean time. The idea is to take a snapshot of the entire planet atmosphere at the same time. Also, more and more data, from satellites and radar for example, is now ingested into the models to varying degrees. A shorter answer is, on a regular day I'll look at three or four.
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