Oregon PRO WEATHER User Manual

Oregon Scientific Professional

Weather Station Collection

Understanding the Weather Accuracy of Oregon Scientific

Weather Stations

Oregon Scientific Australia

11330000 33 00 00 11 55 55

oregonscientific.com.au

Level 10, 30 Clarence Street, Sydney NSW 2000

Part of the Oregon Scientific Time and Weather Collections

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. In high humidity it can feel ‘sticky’ or ‘close’. It often feels like this before a large thunderstorm. A low humidity feels more pleasant even on the hottest days. If the air is too dry however, this can irritate asthma or other respiratory diseases.

Temperature:

We measure temperature in degrees Celsius, or degrees

Fahrenheit. Generally, for humans, temperatures below 18

degrees C (64 degrees F) are a little cool for just sitting around. Those above 30 degrees C (86 degrees F) are a little too hot for strenuous exercise. Temperatures are measured in the shade generally, so that the heat of the Sun does not affect the measurement by actually heating up the instrument being used. In the Sun, temperatures can be as much as 10-15 degrees C (18-27 degrees) higher in calm weather, but much less in windy conditions. The same temperatures will not necessarily produce the same feeling of heat or cold indoors as distinct from outdoors, where wind, sun and humidity also play a part.

Rain:

The measure of precipitation - usually in millimetres.

The rain gauge has a self emptying function where the

amount of rain falling is funnelled onto a see-saw measure with a capture bucket each side as one side fills it tips and empties allowing the other side to fill. 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.

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.

Temperature (resolution 0.1

C):

-20

C ~ 00C: +/- 20C

C ~ 400C: +/- 10C

C ~ 500C: +/-20C

Humidity (resolution 1% RH):

25% RH ~ 40% RH: +/- 7% RH 40% RH ~80% RH: +/- 5% RH 80% RH ~90% RH: : +/- 7% RH

Pressure (resolution 1mb):

795mb ~ 1050mb: +/- 7mb (for products w/pressure reading)

Rain rate (resolution 1 mm/hr):

0 ~ 15 mm/hr:+/- 1 mm/Hr 15mm/hr ~ 998 mm/hr: +/- 10% mm/hr

Wind speed (resolution 0.2 metre/sec):

Min. activation wind speed: 2 metre/sec. 2 metre/sec ~ 10 metre/sec: +/- 1 metre/sec (temp.0

C ~ 400C) 10 metre/sec ~ 40 metre/sec: +/- 10% metre/sec (temp.0

C ~ 400C)

Wind direction (resolution 1 degree):

0 degree ~ 347 degree: +/-8 degree 347 degree ~ 359 degree (blind point): +/- 18 degree

proweather DL 07.05 12/8/05 12:35 PM Page 1

Understanding the Weather

Remote Rain Gauge

RGR122 - Remote Rain Gauge

• Rain Gauge (8 day memory + cumulative total rainfall)

• Indoor thermometer

• Clock, calendar & alarm

• Long range sensor up to 100m from base

PC Link Professional Weather Station

Professional Weather Station

WMR112- 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

• 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

What is Barometric Pressure?

Also known as Air Pressure:

Air pressure is the force of the air pressing down on the Earth’s surface. As air is all around us, there is air pressure all around us too. 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.

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. This is why a low pressure is generally associated with wet weather.

Low pressures often form on the boundary of warm and cold air. 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.

Other common types of lows are ‘thermal lows’. One thermal low, a heat low, recurs over the mainland. During a summer day, the land gets much hotter than the surrounding sea. This in turn heats the air nearer the ground, which rises. This rising air lowers the pressure and a low forms. As the air rises, if there is enough moisture present, intense thunderstorms can develop.

High Pressure: An area of high pressure is usually associated with hot clear summer days, but it can bring fog, frost and even cloud.

High pressure areas are generally larger and move slower than low pressure. The winds circulate around the centre in an anti-clockwise, ‘anticyclonic’ movement. However, the winds are generally weaker than those around a low pressure, especially in the centre.

In a high pressure, the air is generally slowly sinking, or ‘subsiding’. As air falls it warms, preventing clouds from forming. This is why highs are generally clear. However, sometimes the ground may be warm enough to cause some air to rise, and this can form a layer of cloud.

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.

Virtual Weather Station brings your PC to life with a rich array of dynamic and colourful gauges, dials, graphs and charts. The desktop can be completely customised - allowing you to arrange all of the virtual instruments based on your own personal preferences or application. You have literally 1000 ways to display your data.

WMR928NX - PC Link Professional Weather Station

WMR928NX touch screen

monitor display panel

Barometer,

thermo/hygrometer

Outside