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AcuRite Weather Stations / Re: Barometric Pressure Calibration
« Last post by haroldashe on Today at 03:52:34 AM »
GPBARTH, if  cone up with a good weather cam, let us know.  I'm looking for one, too.
Davis Instruments Weather Stations / Re: Leaf station to Envoy
« Last post by Bashy on Today at 03:39:46 AM »
Ok, just noticed this in WD, i assume its on about the leaf station and i assume it means battery?

ISS station status 2 low

Its not quite 3 months old yet


Now says its ok, i also check the battery and it's pushing out 3.3v so that's OK, weird...
Meteohub/Meteobridge / Re: Meteobridge to Ambient Weather Network
« Last post by wvdkuil on Today at 03:34:49 AM »
When I select Ambient Weather Network it pre populates a MAC address (router's) and doesn't let me edit it, how do I change it to the correct address?

Also how do I remove a weather network?

The "MAC Address" shown is, or at least should be, the "MAC Address" of your Meteobridge itself.
You can not modify that address as it is your device-ID for the Ambient Weather Network.


Thanks for the comments everyone. Just a couple of my own.

Firstly I am aware of the reflection issue known as edge of cloud effect and it is generally accepted that this can increase the reading but something up to 20-25%, this coupled with the maximum possible at the top of the atmosphere of about 1370w/m˛ means we should not see values over 1713w/m˛ assuming no atmospheric attenuation which is impossible anywhere with the possible exception of somewhere like the summit of Everest!

We have come to the conclusion that this could be an external effect such as interference but when the solar sensor provides a voltage and the sensor is in a domestic situation it is difficult to see how or why this might happen especially when these spikes can appear for several consecutive minutes. We really need to see the spike on the Davis console to know if this is caused by the Davis system and if not we can then review the software being used.

As the software author has recognised that for some non-Davis stations there could be a possible s/w issue and for this persons WH type station he has some spikes at night time. I think for now we can only consider the Davis situation. I have had issues with readings at night time with my own Davis system which were caused by a failing sensor.

Ideally to progress this issue we need either to see the console values at the time or perhaps somehow capture the raw data being sent to the PC from the console prior to any s/w processing. That way can tie down a bit more where these spikes are coming from.

What Weather Station Should I Buy? / Re: Help A New Guy
« Last post by Bashy on Today at 03:05:59 AM »
found it, i have highlighted the section, this is taken from this (below) its a good informative read

3.1. Temperature
Standard thermometry is appropriate for urban observations but radiation shielding
and ventilation is even more necessary. In the UCL a sensor may be close to warm or
highly reflective surfaces (sunlit wall, road, glass or hot vehicle). Hence shields must
block radiation effectively. Similarly, the lower UCL may be so sheltered that forced
ventilation of the sensor is essential.
In accord with the above the surface should be typical of the UCZ and the
thermometer screen/shield centred in a space with approximately average zH/W. In very
densely built-up UCZ this might mean it is located only 5 to 10 m from buildings. If the
site is a street canyon, zH/W only applies to the cross-section normal to the axis of the
street. The recommended open-country screen height of 1.25 to 2 m above ground level
acceptable for urban sites but on occasion it may be better to relax this requirement to
allow greater heights. Observations in canyons show slight air temperature gradients in
the UCL (Nakamura and Oke, 1988), so as long as the sensor is >1 m from a wall error
should be small, especially in densely built-up areas. Measurements at heights of 3 or 5 m
are little different from those at the standard height. They even benefit by having larger
source areas, the sensor is beyond the easy reach of vandals or the path of vehicles, and
exhaust heat from vehicles is diluted.
Too often roofs are sites for meteorological observations. This may arise in the
mistaken belief that at this elevation sensors are free from microclimates, such as those in
the UCL. In fact roof tops have strongly anomalous microclimates. To be good insulators
roofs are constructed of materials that are thermally extreme. In light winds and cloudless
skies they become very hot by day, and cold by night, with sharp temperature gradients
near the roof. Roofs design also ensures they are waterproof and shed water rapidly. This
together with their openness to solar radiation and wind makes them anomalously dry.
Roofs are also commonly affected by release of heat from roof exhaust vents.
Air temperatures above roof-level using towers, are influenced UCL and roof effects.
Whilst there is little variation of temperature with height in the UCL, there is a
discontinuity near roof-level both horizontally and vertically. Hence if meaningful spatial
averages are sought sensors should be well above mean roof-level so that adequate
blending is accomplished (>1.5zH if possible). Currently there are no methods to
extrapolate air temperature data from above the RSL down into the UCL. Similarly, apart
from statistical methods that require a large set of training data from a dense station
network there is no scheme to extrapolate air temperatures horizontally inside the UCL.
What Weather Station Should I Buy? / Re: Help A New Guy
« Last post by Bashy on Today at 02:57:39 AM »

On one hand Jason you want highiy accurate and up-to-date wind readings yet you want to by an all-in-one station, which as I said previously is never ideal, because unless you live in a totally opened unobstructed area (like airport, no buildings or trees around in any direction), your wind will be very biased.

Wind should ideally be measured at 10m height, temperature at 2m. So either one or the other will be inaccurate.

Having said that, i did read on  siting guidelines that height for the temp placement is not really an issue except
for better circulation being higher. I will try to find what i read, dont hold ya breath though....
Davis Instruments Weather Stations / Re: Leaf station to Envoy
« Last post by Bashy on Today at 02:51:33 AM »
Hi, it was the leaf/soil/temp station board that was replaced, it also came back online around sunrise

Its weird that it disconnected from the Envoy but was still connected to the console
Davis Instruments Weather Stations / Re: Leaf station to Envoy
« Last post by belfryboy on Today at 02:41:13 AM »
Which board did you replace? Was it the sensor PCB, or the transmitter?
I have sort of followed the topic on WW and i have seen the sort of spikes that you are on about,
Some of the spikes appear at night time 10, 11pm, i think this is an interference issue....
Other Weather Topics / Re: WU Underground, REALLY?
« Last post by pimohdaimaoh on Today at 12:53:03 AM »

. . . shortened . . .
cool template, Im now reviewing this and try to embed, best to use this as additives for 7-8 day forecast, at least more than WU viewers can both view forecast in between so I could tab this as Yr.No forecast and WU forecast for both available on my site for good. Thanks again for this, currently studying its scripts then trials and errors then publish in the end.

Question: "is there a way to send my clientraw to that site to appear directly from yr.No? then I will use the ID number that produced there and to create forecast that the data comes from my weather station? since yr.No recieves weather data from different weather stations, I guess and hope I could sent my data there like WU, my WD sending clientraw to WU and I use its 7 day forecast produced from my data at WU?"
At your site you are using the Saratoga-Template.
There are others, such as mine (Leuven) or Jáchym's (Meteotemplate).
But for this post: => Saratoga.

Add-on scripts:
At your current template you should add scripts for or other forecasts which are compatible with your Saratoga-Template.

There are hundreds of them, for forecasts at least three totally different ones.
I would prefer mine, but to be honest, mine is dull, this one has a more sophisticated interface :

All those forecast scripts can often run stand-alone (=without a template environment), which makes installing and testing easier. After you are satisfied with the stand-alone results, you should then integrate them with  your Saratoga-Template.

Forecasts from WU, HWA, EWN, NWS  and ALL others are not based on your private stations data.
That is impossible as the forecast  engine needs tons of data and very large computer installations.
They all use all data available and all of them use each other forecasts models to check and compare.

So there is no use, even no possibillity  of sending your data to or NWS  or other large forecast providers.

WU, EWN and some others use your data to fine-tune their forecasts and to learn how their forecasts differ from the measurements later-on.

All major forecast use a grid of  x miles by x miles for making a forecast. They are not making a forecast for every house on the earth but for every so many square miles. The forecasts differ not that much in most cases, generally speaking.

Their is one exception WXSIM:  that extra PC-program takes a standard forecast and then uses your past data to modify, fine tune the forecast for your private small area.

Current data on your website
Your clientraw and other data is displayed as current data and historical data.

Forecasts on your website
Your forecasts come from providers which look into the future and give their predictions. Could be any provider which you want.

As Jáchym said, their is a lot of reading to do in this interesting weather-scripting area.

Succes, Wim

+2 for me
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