How to weather model railroad track,bachmann trains ho ez track system,ho track layout nascar - 2016 Feature

03.12.2015
If there is only a circle depicted over the station with no wind symbol present, the wind is calm. Sea-level pressure is plotted in tenths of millibars (mb), with the leading 10 or 9 omitted.
A synoptic chart means "weather chart" and meteorologists need to plot weather data collected from hundreds of weather "stations" on a chart - why they are called stations, I don't know. Let's start at 11 o'clock - the dry bulb temperature is the actual temperature of the air and is given in centigrade in South Africa and Fahrenheit in other countries like the USA. At 9 o'clock, we have the "current weather symbol", and there are many symbols representing many types of weather, and in this case, the single dot means light rain. At 2 o'clock we find the air pressure given in hecto Pascals (used to be millibars, but the metric system calls for it to be expressed in metric units - 1mb = 1 hPa).


Since we started offering you the synoptic charts from the South African Weather Service there have been many queries regarding what all those lines and black circles with lines sticking into them and those numbers mean. Some kind of convention had to be adopted so that any meteorologist anywhere in the world can read such a chart and know what it means. Usually, not all the data is shown, and only temperature, current weather and pressure, cloud and wind data is shown.
It is a useful indicator as to how much moisture is in the air - the closer the dewpoint is to the actual temperature, the more humid the air is. The table to the left shows some of the more common types of weather and their symbols (if you go to meteorology school you have to learn all of them). Hence, each weather station on a synoptic chart is depicted by a circle and data collected at that station is plotted as shown in the simple example below.


Let me explain how I deciphered the station model so that you can become an expert at interpreting synoptic charts. The speed is represented by "feathers" or "barbs" that are usually perpendicular to the stick. Each barb is 10 knots and a knot is one nautical mile per hour which is equal to 1.8 kilometers per hour.



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