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Posted
  • Location: Nr Appleby in Westmorland
  • Location: Nr Appleby in Westmorland

Does anyone else have the problem of false readings of precipitation on frosty days? I've been noticing recently that when we have a frosty night, the following day when temperatures rise above freezing again, my rain gauge registers 0.2mm of rain, presumably from the thawed frost in the rain collector. I know it's a minor problem, but it does mean I have to keep a careful record of what were truly days with rain, and it's annoying.

Any ideas how to solve this? Perhaps I could move the gauge indoors?

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Posted
  • Location: Whipsnade, Beds
  • Location: Whipsnade, Beds
Does anyone else have the problem of false readings of precipitation on frosty days? I've been noticing recently that when we have a frosty night, the following day when temperatures rise above freezing again, my rain gauge registers 0.2mm of rain, presumably from the thawed frost in the rain collector. I know it's a minor problem, but it does mean I have to keep a careful record of what were truly days with rain, and it's annoying.

Any ideas how to solve this? Perhaps I could move the gauge indoors?

Actually, to be serious for a moment, hoar frost along with dew and fog drip, is a form of precipitation. Historically, therefore, it has never been excluded in monthly rainfall totals. In the old days of manuscript observations the figure would be entered in brackets and followed with a subscript x for frost, w for dew, and fe for wet fog ... eg (0.2)x (except I can't do a subscript).

In the exceptionally dry February of 1891 there were several stations which recorded 2mm or less during the month, entirely consisting of aggregates of frost and dew.

Philip

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Posted
  • Location: Nr Appleby in Westmorland
  • Location: Nr Appleby in Westmorland

Oh right....thanks Philip. Perhaps I should be impressed that the VP2 is good enough to register this? That's the thing with me...I always come across as a bit grumpy (like earlier today when I was compared to Hitler in a private message) whilst I should actually try to be more positive.

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Posted
  • Location: just south of Doncaster, Sth Yorks
  • Location: just south of Doncaster, Sth Yorks

spot on Philip, beat me too it.

I'm about to answer your pm Dad!!

John

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Posted
  • Location: Worcestershire
  • Location: Worcestershire

I always thought that prep was anything that fell from a cloud, whereas i would have thought that dew or frost forms on surfaces and does not fall??

Wikipedia

In meteorology, precipitation is any kind of water that falls from the sky as part of the weather. This includes snow, rain, sleet, freezing rain, hail, and virga. Precipitation is a major part of the hydrologic cycle, and is responsible for depositing most of the fresh water on the planet. Precipitation is generated in clouds, which reach a point of saturation; at this point larger and larger droplets (or pieces of ice) form, which then fall to the earth under gravity

http://en.wikipedia.org/wiki/Precipitation_(meteorology)

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Posted
  • Location: Nr Appleby in Westmorland
  • Location: Nr Appleby in Westmorland

Actually, my VP2 is starting to annoy me now. Not only have I had to spend an additional £150 to get accurate readings from it (because Davis say it was a problem with MY wiring at home) but now I've had to climb 40ft up a ladder (and I'm bad with heights) to shake the anemometer because the reed switch in it had stuck.

It's a great bit of kit, but for the price, I do expect perfection.

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Posted
  • Location: Dublin, ireland
  • Weather Preferences: Snow , thunderstorms and wind
  • Location: Dublin, ireland
Actually, my VP2 is starting to annoy me now. Not only have I had to spend an additional £150 to get accurate readings from it (because Davis say it was a problem with MY wiring at home) but now I've had to climb 40ft up a ladder (and I'm bad with heights) to shake the anemometer because the reed switch in it had stuck.

It's a great bit of kit, but for the price, I do expect perfection.

You can have a loan of mine OON

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