F2011WxObsLecturePart1 copy

F2011WxObsLecturePart1 copy - 1 Weather Observations: A...

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1 Weather Observations: A Grand Tour, Part One (lots of details, but only a few biggies on test) x How do meteorologists observe surface weather? “Some guy up on a mountain”? WRONG! Two ways: direct (in contact with the weather) and remote . ¾ 100 years ago: some guy in a downtown office checks the temperature, pressure, wind, etc. ¾ 40 years ago: some guy at the airport does same ¾ Last 15 years in U.S.: men and women at office in far, far suburbs. But they don’t make the observations! Automated instruments do. x ASOS: Automated Surface Observing System, developed by National Weather Service and FAA
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2 Observing Surface Weather (with some ASOS) 1. Temperature: thermometer ASOS: electronic resistance thermometer Everywhere else: in “Stevenson screen” Valley Head, Alabama (coldest place in AL) See the Stevenson screen in middle? 2. Humidity: hygrometer ASOS: dew forms on chilled mirror , laser beam is scattered when dew forms—voilà, obtain dew point that way! (What if something else craps up mirror?) Otherwise: psychrometer. Have two thermometers, dry-bulb and wet-bulb (wet footie on
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F2011WxObsLecturePart1 copy - 1 Weather Observations: A...

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