Why do Meterologists use weather balloons to measure wind speeds if they already use anemometers?
813142
Anemomter is used only to measure surface winds.But balloons are released to know the direction and speed of winds at higher levels  sometimes upto 30 Kms above ground.Temperature ,pressure, and humidity are also measured at different heights above the earth in addition to the wind,attaching sensors in a transmitter and sending the transmitter tied to the balloon .The signals corresponding to temperature,pressure and humidity are received by a receiver at the observatory and values are evaluted.As the balloons are filled with the light hydrogen gas they are carried away by the wind at a speed equal to the wind speed .(and at the sametime the balloon is continuosly rising due to buoyancy).The position of the balloon is determined every minute by the tracking radar and the wind speed at different height is thus calculated.
19163
METEROLOGY AND CLIMATOLOGY ARE EARTH STUDIES THAT FOCUS ON\nON SYSTEMS OF PRESSURE THAT FORM ALMOST ANY IMPACT ON WEATHER AND CLIMATE. We study how systems move. And how earth and regional areas are changed by some storm half a world away. Composition You mean Density of storm matter or something else?
137459
Differential heating causes hot air to rise and other air has to take its place so that in turn causes wind.  Weather is very complicated and is affected by many variables.
140128
the are trying to reduce wind drag
303292
To check direction of the WIND ?
861784
Not necessarily true. When I was in the Air Force, I was a weatherman. We got sent to St. Louis to some air pollution research, which meant sending up mini weather balloons. At night, we sent the balloons up with a small light attached to them so we could track them. We had about 10 teams scattered over St. Louis doing this, and after the first night, the newspapers read that there were all kinds of calls made sighting lights in the sky.
80805
Not sure about forecast, but Kestrel makes some amazing anemometers (wind meters), some with barometers and altimeters built in.
602607
Weather satellites are used to collect basic data, such as temperature and moisture levels, which allows experts to predict weather to a reasonable extent. Past attempts to control weather have been largely unsuccessful and have centered mainly in trying to create rain.
388597
KiloPascals\nInches of Mercury\nPounds per Square Inch\nAtmospheres\nMillibars\n\nAll of these are used as units to measure air pressure.\n\nStandard atmospheric pressure is usually measured as millibars. Like when you watch the Weather Channel...\n\n:)
933361
Balloons are quite difficult to steer, they tend to just go with the prevailing wind, they also have to be careful of strong up and down draughts, which you will certainly get over deserts.\n\nIt's a nice idea, and would certainly be quite a "green" transpotrt system, but I think the problems would outweigh the benefits.
719654
Weathermen are called meteorologists because a word like meteo is Greek for sky.   Same as meteors, which fall from the sky.   Meteorology of course is all about the atmosphere and sky.
142850
When you have a difference of pressure in the air there is a "low" and a "high" zone (think weather forcast on the news). The high pressure zone naturally wants to "even out" with the low so air moves to it creating wind among other things. Actually the air doesn't just move, it gets sucked! It's the same principal with a vacuum cleaner, only instead of dirt you've got a kite. You also have the shape of the kite which can manipulate the wind force and give it lift. I can't say I'm a kite engineer(I wish though) but the angles are probably a key role in how the kite is better controlled.
5524
They come from the east. Meteorologists refer to the wind by the direction in which the winds are coming.
19857
Formula used to calculate wind chill\n\nThe term "wind chill" goes back to the Antarctic explorer Paul Siple, who coined it a 1939 dissertation, "Adaptation of the Explorer to the Climate of Antarctica." During the 1940s, Siple and Charles Passel conducted experiments on the time needed to freeze water in a plastic cylinder that was exposed to the elements. They found that the time depended on how warm the water was, the outside temperature and the wind speed.\n\nThe formulas used to calculate wind chill were based on those experiments.\n\nIn the fall of 2001, the U.S. National Weather Service and the Canadian weather replaced the formulas with new ones (one for Fahrenheit temperatures and one for Celsius readings). The new formulas are based on greater scientific knowledge and on experiments that tested how fast the faces of volunteers cooled in a wind tunnel with various combinations of wind and temperature.\n\nThe new formula for winds in mph and Fahrenheit temperatures is:\n\nWind chill temperature = 35.74 + 0.6215T - 35.75V (**0.16) + 0.4275TV(**0.16)\n\nIn the formula, V is in the wind speed in statute miles per hour, and T is the temperature in degrees Fahrenheit.\n\nNote: In the formula, ** means the following term is an exponent (i.e. 10**(0.5 ) means 10 to the 0.5 power, or the square root of V), - means to subtract, + means to add. A letter next to a number means to multiply that quantity represented by the letter by the number. The standard rules of algebra apply.\n\nFor reference, the old wind chill formula was:\n\nT(wc) = 0.0817(3.71V**0.5 + 5.81 -0.25V)(T - 91.4) + 91.4\n\nSource for both formulas: The National Weather Service
1090720
An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. The term is derived from the Greek word "anemos" meaning wind.\n\nAnemometers may be divided into two classes, (1) those that measure the velocity, (2) those that measure the pressure of the wind, but as there is a close connection between the pressure and the velocity, a suitable anemometer of either class will give information about both these quantities.\n\n\nCup anemometers\nThe simplest type of anemometer is the cup-anemometer, invented (1846) by Dr. John Thomas Romney Robinson, of Armagh Observatory. It consists of three or four hemispherical cups, mounted one on each end of a pair of horizontal arms, which lie at equal angles to each other. A vertical axis round which the cups turn passes through the center of the arms; a train of wheel-work counts up the number of turns which this axis makes, and from the number of turns made in any given time the velocity of the wind during that time is calculated. The cups are placed symmetrically on the end of the arms, so it is easy to see that the wind always has the hollow of one cup presented to it; the back of the cup on the opposite end of the cross also faces the wind, but the pressure on it is naturally less, and hence a continual rotation is produced; each cup in turn as it comes round providing the necessary force. The two great merits of this anemometer are its simplicity and the absence of a wind vane; but if used without electronic data logging equipment it is not well adapted to leaving a record of the actual velocity at any definite instant, and hence it leaves a short but violent gust unrecorded. Unfortunately, when Dr. Robinson first designed his anemometer, he stated that no matter what the size of the cups or the length of the arms, the cups always moved with one-third of the velocity of the wind. This result was apparently confirmed by some independent experiments, but it is very far from the truth, for it was later discovered that the actual ratio, or factor as it is commonly called, of the velocity of the wind to that of the cups depends very largely on the dimensions of the cups and arms, and may have almost any value between two and a little over three. This had the result that wind velocities published in many official 19th century publications were often in error by nearly 60%.\n\nHot-wire anemometers\nHot-wire anemometers use a thermistor or other temperature measuring device heated up to some warm temperature. Air or other gases or fluids flow past the hot wire and cool it to a steady temperature, which depends on the flow rate. The change in resistance can be calibrated to changes in flows for a cheap way to measure flow rates.\nSonic anemometers\nSonic anemometers uses sound waves to measure wind speed and direction. They're capable of measuring the wind velocity in the X (east-west), Y (north-south), and Z (up-down) directions. Additionally, they can take measurements with very fine resolution, and the lack of moving parts makes them appealing to automated weather stations. Use of such anemometers is likely to increase in the future.\n\n\nWindmill anemometers\n \nAn aerovaneThe other forms of mechanical velocity anemometer may be described as belonging to the windmill type. In the Robinson anemometer the axis of rotation is vertical, but with this subdivision the axis of rotation must be parallel to the direction of the wind and therefore horizontal. Furthermore, since the wind varies in direction and the axis has to follow its changes, a wind vane or some other contrivance to fulfill the same purpose must be employed. An aerovane combines a propeller and a tail on the same axis to obtain accurate and precise wind speed and direction measurements from the same instrument. In cases where the direction of the air motion is always the same, as in the ventilating shafts of mines and buildings for instance, wind va
1140242
The wind exerts more pressure on the open side of the cups than it does on the rounded side, so that no matter which direction the wind is coming from, the cups will spin.  Wind velocity is calculated by the speed of the spin -- rotations are counted and divided by the time of measurement.  It was invented in 1846 but didn't really become accurate until electrical spin counters and timers were added.
241018
= wind speed measurement over shore and water surface.\n\nclick link to read more...