| Observation time |
| The latest observation time is shown local time. The
station server checks it's clock with atomic clock in
10-hours interval, so the update times are quite accurate. The weather
station saves statistics in 30-minutes interval, but the current
obervations are updated every 5 minutes. If a page is open in browser,
it will automatically update itself every 5 minutes. |
| Sunrise/sunset |
| These are actual local times based on station location. |
| Wind/Wind Direction |
| Wind is shown as ten-minute average speed and wind direction. In addition day's maximum is shown. The maximum wind speed is saved to statistics. The 24-hour
graphs show ten-minute average wind speed, direction and gust speed measured between
30-min interval. |
| Temperature |
| Temperature is measured with radiation shielded and fan-aspirated
sensor. The value measured at time of update and minimum/maximum
values are shown. The extreme values are saved to statistics. The
24-hour graph shows values measured between 30-min interval. |
| Wind Chill |
| Shown only when temperature is below 20 °C. Wind Chill takes into account how the speed of the wind (10-minute average)
affects our perception of air temperature. The minimum value is saved to statistics. |
| Heat Index |
| Shown only when temperature is 20 °C or more. Heat Index uses the temperature and the relative humidity to determine
how hot the air actually feels. This value is not so
important in Finland, but we do have hot days occasionally. The maximum value
is saved to statistics. |
| Dew Point |
| Dew Point is the temperature to which air must be cooled for
saturation (100 % relative humidity) to occur, providing there is
no change in water content. this helps to predict the likelihood of
fog. Minimum and maximum values are saved to statistics. |
| Barometer |
| The air pressure is show as the pressure at sea level. The rate of
air pressure change is more important than the absolute air pressure
value at given time. The extreme values are saved to statistics. The
24-hour graph shows values measured between 30-min interval. |
| Solar Radiation |
| Solar Radiation is a measure of the intensity of the sun's radiation
reaching a horizontal surface. this includes both the direct radiation
component from the sun and the reflected component from the rest of the sky.
the solar radiation reading is Watts per square meter (W/m²).
the maximum value is saved to statistics. The 24-hour graph shows
values measured between 30-min interval. |
| UV Index |
| To estimate the need for protection against sun there is a UV Index. Values above 3
mean the need to use protection. |
| Humidity |
| Relative Humidity measures the amount of water vapor in the air
as percentage of the amount the air is capable of holding. This varies
with air temperature and pressure and has an effect to Heat Index and Dew Point.
the extreme values are saved to statistics. The 24-hour graph shows
values measured between 30-min interval. |
| Rainfall/rate/storm |
| Rainfall shows the accumulated rain since midnight local time, converted to water in winter.
This type of rainfall gauge is sensitive to wind, and specially the amount of snow will not be counted
when the wind blows. The rain rate is shown as millimeters per hour. 24-hour graph shows the accumulated rain.
Rainfall and rain rate are saved to statistics. Storm means collected rain when there has not been a longer time than 24 hours without rain. Rain is shown only after
it has been raining over 0,2 mm in 15 minutes! |
| Evapotranspiration |
| Shows the amount of water that evaporates from ground. Solar radiation och wind has an
effect of this value. The equivalent amount of rain is needed to keep the
water balance. The 24-hour graph shows values measured between 30-min interval.
Statistics show the daily, monthly and yearly values. |
| Cloud Base |
| Cloud Base is the height where water vapour condenses into cloud. |
| Airport Weather Information |
| Airport weather information is available from Internet in METAR-format. The information of
the nearest airports is presented here. |
| Astronomy |
| Civil twilight: The upper edge of the sun has dropped below horizon and the center of
of the sun is not more than 6° below horizon. Nautical twilight: The center of
of the sun is 6-12° below horizon. Astronimical twilight: The center of
of the sun is 12-18° below horizon. When the center of the sun is more than 18° below
horizon, it's dark. |
| About Browsers |
| I have not used any browser-specific features on my pages. I have tested
the pages using Internet Explorer 6, Opera 7 and Netscape 7. I am
very interested in problems, if you encounter some. Please use the
feedback form to report possible problems. |
