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Flying Astronomer

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  1. Hmm, this isn't a very technically-cpable forum, is it? I found that reloading the datalogger archive solved the problem. J.
  2. Hmmm, I don't think that's entirely right, is it? There would have to be quite serious design defects in the 'funnel' for the automatic station to gather that much less rain. It's almost certainly due to calibration error than whether or not there is a circular top or not. In fact, I've never seen anything other than a circular gauge, auto or manual! J.
  3. Hello! I'm putting together a Stevenson Screen, and wondered if anybody can make any constructive comments on the following range of thermometers, and which is best for standard observations, from Russell Scientific (from whom I bought an excellent (and very expensive) met. standard barometer a year or so ago)? http://www.russell-scientific.co.uk/thermo...ermometers.html Thanks, John.
  4. For some reason, my monthly data is not appearing on Wunderground. Daily and weekly are fine, and in the past, before I moved, data was gathered monthly with no problem. Any ideas? J.
  5. Consumer-grade automatic stations are also apt to under-read, as only a random selection is sampled for accuracy. From other discussions, it seems they can under-record by at least 10%, so it's worth hanging a decent plastic gauge near to your station, so that you can compare results and calibrate if needed. My Davis VP2 collector typically has a good 0.2mm worth in the cup after it stops raining, not quite enough to tip it over and register the reading. This also makes the next rain session look abnormally heavy for the first few minutes. However, an error of this magnitude is entirely acceptable in the overall scheme of things! Next to siting errors, it's utterly insignificant! J.
  6. It's hardly surprising that few people are willing to fork out nearly £500 for a timber screen, no matter how well-made it is. Does anyone know of cheaper versions that comply with the standard screen criteria, or alternatively, know of any suppliers of double-louvre panels, or just a simple workaround (I take it two single panels back to back would work, if a little cumbersome? J.
  7. I'll answer my own question, then! It updates every '50 seconds - 1 minute' according to Davis. It's every 5 minutes after dark. J.
  8. Hello, I've just bought the solar sensor, and I know it's not the best in the world, nor the best value for money. Does anyone know its operating regime? It seems to average over a period rather than respond instantaneously. Anyone have any knowledge about this they care to share? Kind regards John. www.flyingastronomer.co.uk
  9. Ah, yes! But mammatus in cirrus or cirrocumulus? Is that known? I've never seen nor heard of it, not that that means much! B)
  10. Nice pics! Here is a curious one I saw about 90 minutes before a big storm cell developed and formed one funnel cloud and two incipient funnels. I've never seen virga pointing in two, 180-degree opposed directions before, so I wonder if this was an early indicator of opposed winds and the funnel cloud to come? And here's another from a few days ago - it's got even the Cloud Appreciation scratching their heads!
  11. Absolutely. 'Tornado' gets some attention, which is sadly required in order to get the media interested (which worked - appearing in the Daily Post tomorrow morning) :lol:
  12. Thanks for the kind comments! I stopped the car off the line of traffic queuing to go into the show. Stewards looked on with disdain. I told them I was eccentric, which seemed to please them. When I went up to them and pointed out what I was looking at, they were mightily impressed. Job done! J.
  13. Lovely shot. Very, dare I say it, autumnal skies, too! J. www.flyingastronomer.co.uk
  14. I spotted this on the way in to the Anglesey Agricultural Show today - 13/8/2008 between 09:43 and 09:51 BST. I stopped to take a series of photos, and dozens of others took me lead and did the same! The parent cell (image about 130 degrees across), about 5 minutes before the funnel appeared (two further incipient funnels were visible briefly).
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