Name  of a company which makes a multi function instrument relating barometric pressure with accurate weather.
80805
Not sure about forecast, but Kestrel makes some amazing anemometers (wind meters), some with barometers and altimeters built in.
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
46950
There are many, many types of weather instruments. A complete list would be very extensive, but here are a few instruments to investigate:\n\nAnemoscope, anemometer, hygrometer, barometer,rain gauge, thermometer, sling psychometer, radiosonde, rocketsonde, theodolite, weather satellites, doppler radar, various lightning instruments like time of arrival and magnetic direction sensors, lightning imaging sensor (space-based), electric field mills, Gerdien conductivity probes, pyranometer (actinometer), evaporimeter (atmometer), and so on.
544464
A hand held instrument called a velometer. It measures the pressure of the air against a tube and gives a digital readout. Feet per second, Meters per sec.
635370
It isn't easily automated. I mean you can't have a remote automated weather station that reports the humidity with a sling psychrometer, it requires manual operation.
155279
By measuring the change in pressure.
953596
http://www.komar.org/faq/manometer/\nhttp://www.science-house.org/student/bw/flight/manometer.html\nhttp://bagpipejourney.com/articles/manometer.shtml\n\nhope these might help!\nkayt
581432
atmospheric pressure, winds, light
426812
Meteorology or atmospheric physics.  I think.
10778
A Psychrometer is the general name for instruments designed to determine the moisture content of air. A psychrometer consists of dry-and wet-bulb thermometers that give the Dry-and Wet-bulb Temperatures, which in turn are used to determine Relative Humidity and Dew Point.
136243
measuring device of some sort (scale, ruler, thermometer)
1170130
barometers only measure atmospheric pressure. The higher the humidity, the lower is the pressure . Of course for a same mass of air, the pressure is directly related to temperature (PV=nRT)\n\nso to answer your question: Lower in the tropical forest
938926
Weather radios on the market. What kind of weather station are you looking for ?
487478
Contact the National Weather Service\n\nwww.weather.gov
239654
Can't make one, just have to be lucky enough to find one.  Someday there may be devices to detect and even forecast them like the weather.  Right now, though, that's science fiction....\n\n....or IS it?
1032186
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\nThe first anemometer was invented by Leone Battista Alberti in the 1400's.\n\nFor more details:
803179
Changes in air pressure and possibly humidity.  Your body turns into a barometer.