Posted by admin | Posted in Thermo Hygrometers | Posted on 18-12-2007
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Why does my weather station give false predictions?
I have a little weather station that has a sensor which I have to hang outside, so I tied the outdoor sensor on a pear tree. I get accurate temperature readings, moon phases and sunrise/sunset times, but it will rarely predict rainfall accurately. It has a weather girl display with atmospheric pressure displays and a pressure graph too. So when its showing raining animation it always seems to be a dry day. How can I get realistic rainfall readings from this?
But I thought wind is created when air moves from high pressure zones to low pressure zones so while this is happening it usually bring coulds with it to the low pressure areas and when coulds become heavy enough with water vaopur they fall as rain?
water vapour i mean
How do you think a weather station can predict rain? It can't. What it can is to measure the atmospheric pressure and moisture then it thinks: Ah, the pressure is low and the moisture is high: it must be raining!
That is not a prediction but an observation. The only prediction your weather station can make is the wind force. A rapid fall or rise of the atmospheric pressure is a certain sign that it will be windy. As a rule of thumb, seafarers say that if the pressure falls or rises 10 hPa within 8 hours, a gale wind will blow, and it always does.
But rain is coming from clouds that are moving in or developing from a strong convection. How do you expect your weather station to know that e.g. there is a mountain range between you and the rain and that it will stop it?
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