Tan William wrote:
>
> Dear All,
>
> Is there anyway circuit that can be build to predict
> the weather is going to rain?
>
> Pls help ....
If you find one, sell it to the weather bureau. I think they rely on
thier computer models too much these days, and forget about looking out
their windows occasionally.
There are two reasonable ways:
1) Sustian a war injury, grow old, and press a button when it 'acts up'.
2) Hire some elder who has such an injury and have them press the button.
There are no 'sure signs' of rain, but you can always use an internet
attached PIC to read off the percentage chance of rain from your
favorite web site and sound the warning if the percentage is above a set
point.
There are simply to many unknowns and too many factors. Meteorologists
with satellites, weather ballons, and ground sensors (radar, etc) can't
tell weather accurately within an hour.
Of course, if you mean to sell these in seattle, you can just wire it 'on'.
>Dear All,
>
>Is there anyway circuit that can be build to predict
>the weather is going to rain?
>
>Pls help ....
>
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The best single station forecasting method that I have found is the "Sager
Weather Caster". I have some info on it at: http://www.pacificsites.com/~brooke/Weather.shtml The accuracy may be improved
by basing the lookup table on your local conditions.
The book works best on the East Coast, but I used it in the S.F. bay area and it
worked fine.
This is easy, simply place an LED on the desk, if it illuminates with no
connections to it, this indicates that it will NOT rain in the next 24 hours. This
device is 97% reliable in the UK !
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Dear All,
Is there anyway circuit that can be build to predict
the weather is going to rain?
Pls help ....
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I saw one in an Elector mag some time back, only worked in Britain. It was
basically a simple circuit, just a flat battery and an led across it. If the
led lights it is not going to rain. They claimed something like 80% accuracy
if I remember correctly!
> This is easy, simply place an LED on the desk, if it illuminates with
> no connections to it, this indicates that it will NOT rain in the next 24
> hours. This device is 97% reliable in the UK !
Only 97% ? Nice to know the weather is clearing up over there at last
UK rain thing was based upon humidity. Suppose the best way to detect if
its going to rain, is to have a series of sensors, ring like configuration
at some distance from you, say 10 miles. Each sensor will monitor relative
humidity, wind, moisture, etc. Then each sensor system is polled and a host
computer looks at each unit and relates the data to indicate a rise in
humidity, temp lower, etc. Then it can continue and then if the water sensor
is activated it is pretty much assured that you might get rain in a while.
Sounds rather complicated tho....
> Is there anyway circuit that can be build to predict
> the weather is going to rain?
Here in Holland the prediction formula:
int rain_tomorrow( void ){ return 1; }
works quite well. In most other countries
int rain_tomorrow( int rain_today ){ return rain_today; }
might work better, often it fails only two times each year. It said that in
some unfortunate countries
int rain_tomorrow( void ){ return 0; }
has performed amazingly well the last few years.
> This is easy, simply place an LED on the desk, if it illuminates with no
> connections to it, this indicates that it will NOT rain in the next 24
> hours. This device is 97% reliable in the UK !
This method works here too! In our case the indication is inverted, if it
illuminates, then it indicates that it will rain! And it is more accurate
than in the UK ;-) ;-).
Peter
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>Here in Australia it is a little different, not only do we know it is going
>to rain but we can control when and how much it will rain.
>All we do is wash the car and it rains. The amount of rain is proportional
>to the amount of effort we put into cleaning the car.
After the recent rain here in Brisbane (Australia), I was considering
drawing some markers up the inside of my car and retiring it as a
rain-gague. Man I hate the smell of wet carpet. Time to get out the
silicone glue again.... <g>
DH wrote:
Here in Australia it is a little different, not only do we know it is going
to rain but we can control when and how much it will rain.
All we do is wash the car and it rains. The amount of rain is proportional
to the amount of effort we put into cleaning the car.
Regards
David Huisman
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> Here in Australia it is a little different, not only do we know it is
going
> to rain but we can control when and how much it will rain.
>
> All we do is wash the car and it rains. The amount of rain is proportional
> to the amount of effort we put into cleaning the car.
New Zealand:
New Plymouth
If you can't see the mountain (Taranaki) it is raining.
If you can see the mountain then it is going to rain.
Westland (wet-land), Chatham Islands
If it's not raining then someone has made a mistake.
This will be remedied VERY shortly.
Auckland
Rains quite a lot. Mainly at weekends.
Wellington
Rains less than Auckland but the rain comes in horizontally.
Generally
Usually rains somewhere here about 2 or 3 days after the Aussie's wash
their cars.
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I dont know if your question ever got answered, but,
how accurate do you want?
Barometric pressure is actually a good way to predict if it is going to rain. I know the accuracy would deffenitly be much greater than 50% (if 50% is ok, use a coin).
You could hook up a little digital barometer to a comparator, and if the pressure drops enough (low pressure=rain, high=no rain), then a light could come on or whatnot.
This is how it was done in the home for decades (most of our grandpas had them).
"These pressure differences have a big effect on the weather, so if you know the current air pressure at your house, as well as the pressure trend, you are able to predict certain things about the weather. As a very loose rule, a high-pressure area will be clear, and a low-pressure area will be cloudy and rainy. " (http://www.howstuffworks.com/question13.htm)
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> I dont know if your question ever got answered, but,
> how accurate do you want?
> Barometric pressure is actually a good way to predict if it is going
> to rain. I know the accuracy would deffenitly be much greater than 50%
> (if 50% is ok, use a coin).
I noticed this week that the foil lid on a large size "noodles in a
bowl" bulges up significantly when the atmospheric pressure drops
just before rain. Appears consistent no matter what the flavour. Add
a microswitch, battery and buzzer (and anti-theft device) and there
you have it. Should only be about a 2 minute job...
Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail: EraseMEbrent.brownEraseMEclear.net.nz
> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops
> just before rain. Appears consistent no matter what the flavour. Add
> a microswitch, battery and buzzer (and anti-theft device) and there
> you have it. Should only be about a 2 minute job...
Of course the accuracy would likely depend on what the weather was like at
the factory when it was produced! On the plus side, you'v got something
warm to eat while it rains.
> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops just
> before rain. Appears consistent no matter what the flavour.
Good to see you have found an alternative to watching the grass
grow. Which is the bigger rush ? :-)
One solution we were going to use for a robotic telescope that lives
out in the middle of nowhere, was to have rain detectors at several
points around the compass and some distance from the telescope.
They were to be equipped with little radio transmitters and when
they detected rain, would radio the telescope and it would shut
down. Since it was looking at the sky and would shut down if it
was cloudy anyway, the main situation we were concerned about
was a frontal band.
Steve.
======================================================
Steve Baldwin Electronic Product Design
TLA Microsystems Ltd Microcontroller Specialists
PO Box 15-680, New Lynn http://www.tla.co.nz
Auckland, New Zealand ph +64 9 820-2221
email: @spam@steveb@spam@spam_OUTtla.co.nz fax +64 9 820-1929
======================================================
On Fri, 16 Nov 2001, Brent Brown wrote:
> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops
> just before rain. Appears consistent no matter what the flavour. Add
> a microswitch, battery and buzzer (and anti-theft device) and there
> you have it. Should only be about a 2 minute job...
Wow, it also doubles as an emergency food source, wonder if the
manufacturers thought of that :-)
I recently had the opportunity to confirm DH's theory below (YMMV outside
Australia): I cleaned and de-odourised the inside of my car on the weekend
(to get rid of the wet carpet smell), and it promptly became overcast and
rained and filled up the floor-trays within 3 hours. I may need to combine
the input of a water-level meter and my odometer to get accurate rainfall
readings, since I get more water intake when I drive on rainy days. Have
to hand-enter the "amount of effort" as well (see DH below).
*sigh*
-Dave.
David Venz
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After the recent rain here in Brisbane (Australia), I was considering
drawing some markers up the inside of my car and retiring it as a
rain-gague. Man I hate the smell of wet carpet. Time to get out the
silicone glue again.... <g>
DH wrote:
Here in Australia it is a little different, not only do we know it is going
to rain but we can control when and how much it will rain.
All we do is wash the car and it rains. The amount of rain is proportional
to the amount of effort we put into cleaning the car.
Regards
David Huisman
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