User manual OREGON SCIENTIFIC PRO WEATHER 08 05

[. . . ] proweather DL 07. 05 12/8/05 12:35 PM Page 1 Understanding the Weather Humidity: Humidity is a measure of the amount of water vapour in the air. A high humidity means that there is a lot of water vapour, and a low humidity means a little. [. . . ] The amount of rainfall is simply measured by the number of times the seesaw tips from one side to the other. The reading is given as a rate of rainfall in mm per hour as well as cumulative amount. Part of the Oregon Scientific Time and Weather Collections Oregon Scientific Professional Weather Station Collection Wind: The measure of wind speed and direction using an anemometer. The vein measures the direction the wind is coming from usually given as a compass direction or bearing and speed given in knots, kph. mph or m/s. Oregon Scientific Australia 1300 300 155 oregonscientific. com. au Level 10, 30 Clarence Street, Sydney NSW 2000 proweather DL 07. 05 12/8/05 12:35 PM Page 2 PC Link Professional Weather Station WMR928NX - PC Link Professional Weather Station · Anemometer · Rain Gauge · Thermo-hygrometer · Barometer · Graphical weather forecast for the next 12-24hrs · Long range sensors up to 100m from base · Solar powered data transmitters relay the weather data via 433Mhz from sensors to the base display unit · Touch screen base display unit · Max and Min memories for all weather readings · Interchangeable measurements for all readings; select either metric or imperial · Hi/Lo alarms for all weather measurements · Virtual Weather Station PC software and connecting cable supplied Understanding the Weather What is Barometric Pressure? Also known as Air Pressure: Air pressure is the force of the air pressing down on the Earth's surface. Near sea level there is more air above you than there would be on the top of Mount Everest, therefore the air pressure is higher near the sea than it is on the top of a mountain. WMR928NX touch screen monitor display panel Barometer, thermo/hygrometer Outside thermo/hygrometer Rain gauge Anemometer ­ wind speed/direction gauge Low Pressure: In an area of low pressure the air has a tendency to rise. This general upward motion means that there is less pressure from the air pushing down on the earth, in other words there is low pressure. As air rises, it cools and if there is enough water vapour it may condense to form clouds and rain. A small disturbance may cause the pressure to fall along this boundary, causing a circulation of air to develop. This is the beginning of a low pressure where the winds circulate around the centre in clockwise `cyclonic' movement, and the boundaries of warm and cold air become weather fronts. During a summer day, the land gets much hotter than the surrounding sea. As the air rises, if there is enough moisture present, intense thunderstorms can develop. Virtual Weather Station Virtual Weather Station is the most widely used software package for connecting your personal computer to your weather station and the Internet, allowing you to display, plot and store data for comprehensive monitoring and analysis. Runs on all Windows 32-bit operating systems, including 95/98/NT/2000/ME/XP. [. . . ] In a high pressure, the air is generally slowly sinking, or `subsiding'. However, sometimes the ground may be warm enough to cause some air to rise, and this can form a layer of cloud. [. . . ]