Local Weather Guide |
 Weather forecasting has a long history; it has been a subject of interest since man existed. The word "meteorology" comes from the Greek words "meteoros" and "logia". Aristotle is considered to be the founder of meteorology. The most important book written by an ancient Greek scientist is the "Book of Signs", which remained significant for nearly 2000 years. Long before modern times, weather conditions were related with the position of stars, although that type of thinking was later proven to be wrong. The Romans for example, thought that summer heat is connected with the star Sirius, which appears in the sky in mid July.Even nowadays weather forecast is not precise, but if you combine it with immediate local conditions and a little effort you can be pretty sure you will have enough information to be prepared for any change of weather and prevent getting yourself and your boat in any danger. Clouds It is important to know some types of clouds if you want to know what type of weather you can expect in future. To help you with that we are going to mention some salient concerning clouds. Cirrus: They are the clouds of the highest altitude; about 7000m and are therefore very thin. Although cirrus are not precipitation clouds, they are usually a good sign of upcoming stormy weather. We have noticed that in our area cirrus move from NW or W towards S or sometimes SE. Cumulus: Possibly the best known sign of upcoming nice weather. Its full name is cumulus humilis. It can be seen at 2000m altitude; it mostly looks puffy, appearing above island hills. Usually it is a precursor of an upcoming maestral. If they are influenced by some other weather factors cumulus can turn into cumulonimbus. Cumulonimbus is a dangerous cloud; it is dense, bringing thunderstorms, severe rain and strong wind. The top is usually in the shape of an anvil. There are many subtypes of cumulonimbus but it is enough to notice the basic one to know that you should prepare for bad weather. Other than clouds, other atmospheric features can be subtle but yet useful signs if you want to predict the weather. Sunset Even though most people only see sunsets as a perfect romantic scene, someone who is educated in meteorology may inform his loved one of what type of weather they can expect in the foreseeable future. Everyone who has significant experience at sea knows that it is extremely important to observe the Sun and other changes on western part of the sky. There are several possible events during the sunset and to notice everything requires years of experience and long term observation, to mention everything would be too much so we are going to mention the most important things concerning this subject. Pleasant sunset: If during the sunset colors are bright (yellow, orange and red), and if you can see some cirrus while the weather is almost completely clear you can almost certainly expect that the nice weather is going to continue Dull sunset: When the sunset is blurry and without bright colors or the Sun sets behind a cloudy layer on the horizon you can expect bad weather soon. Low-cut sunset: If u notice that under cloudy or blurry sky the weather becomes clearer, i.e., if under thick, dark wall of clouds you notice a stripe of clear sky accompanied by purple colors; it is a sign that weather will improve. Halos These are optical phenomena in the atmosphere. They appear as refracted rings and lines of light around light sources such as the Sun. If you see that on the inside, closer to the sun, there's a red ring with a purple region outside, you are observing a sign of upcoming bad weather. These halos are connected to cirrus clouds. Rainbows Another phenomena which always appear to be nice, but we think you should be warned about the difference between the western rainbow and the eastern one. The eastern rainbow signals nice weather and the western one is a sign of upcoming rain and bad weather. If the rainbow is behind observers back while in front of him is a cloudy sky, it might be raining. It appears most often in the afternoon and in the early evening. Mirages A mirage is a naturally-occurring optical phenomenon, in which an effect is created of a reflected image of distant objects or the sky. There are superior and inferior mirages. Inferior mirage: This appears when there is a layer of thick cold air above sea, and on the surface is a layer of warm air, giving the impression that distant islands are coming out of the sea. An inferior mirage is a sign of prolonged good weather. Superior mirage: A superior mirage occurs when the air below the line of sight is colder than that above, which is contrary to the normal temperature gradient of the atmosphere. This creates the effect of boats and islands sinking into the sea. This mirage is a sign of upcoming bad weather. Tides Tides are the cyclic rising and falling of the sea surface due to the activities of the Moon and Sun. Knowing something about tides is important because it affects coastal navigation. Low tide is a sign of stable clear weather, and high tide usually indicates the possible rainfall. Even though tides are somewhat regular, they can be disrupted by some atmospheric influences, for example, strong winds can push water towards the shore or away from it. When that happens air pressure drops and the sea level usually rises, and if it occurs during high tide then it's called "high water", on the other hand before bura wind blows, "low water" occurs, accompanied by high air-pressure - a sign of nice weather. Clear skies! |
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