What a time to break my measuring jar, on the way to the gauge at midnight.
I could only measure the rainfall in cc's - does anyone have a conversion to
mm's?
My Davis is under-recording currently (haven't yet fixed it) hence the
manual gauge and the Davis recorded 51.6mm!
The manual gauge inner holder had overflowed slightly, only the second time
I've known this, previous occassion in Penistone with about 115mm - will
check that.

--
David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.

David Mitchell wrote:

What a time to break my measuring jar, on the way to the gauge at
midnight. I could only measure the rainfall in cc's - does anyone have a
conversion to mm's?

1 cubic centimetre is 1 millilitre!



--
Brian Wakem
Email: http://homepage.ntlworld.com/b.wakem/myemail.png

On 16 Jun, 09:05, Brian Wakem wrote:
David Mitchell wrote:
What a time to break my measuring jar, on the way to the gauge at
midnight. I could only measure the rainfall in cc's - does anyone have a
conversion to mm's?


Easy to calculate. For a standard 5 in raingaguge = 127 mm diameter
and thus 63.5 mm radius:

For a cylinder of 1 mm depth, volume of water = Pi x radius squared

Thus 1 mm depth = 3.14 x (63.5)^2 = 12, 668 cubic millimetres = 12.668
cubic centimetres or millilitres

Thus 1 mm = 12.7 ml or cm^3

If your gauge is not 5 in/127 mm, recalculate using the appropriate
diameter and radius

HTH.

Stephen
Stratfield Mortimer, Berkshire

"Stephen Burt" wrote in message
ups.com...
On 16 Jun, 09:05, Brian Wakem wrote:
David Mitchell wrote:
What a time to break my measuring jar, on the way to the gauge at
midnight. I could only measure the rainfall in cc's - does anyone have
a
conversion to mm's?


Easy to calculate. For a standard 5 in raingaguge = 127 mm diameter
and thus 63.5 mm radius:

For a cylinder of 1 mm depth, volume of water = Pi x radius squared

Thus 1 mm depth = 3.14 x (63.5)^2 = 12, 668 cubic millimetres = 12.668
cubic centimetres or millilitres

Thus 1 mm = 12.7 ml or cm^3

If your gauge is not 5 in/127 mm, recalculate using the appropriate
diameter and radius

HTH.

Stephen
Stratfield Mortimer, Berkshire


Thank-you very much for that.
This gives a rainfall total for the 24 hr period to 0000 yesterday of
75.1mm, which fits in nicely with what the Davis seems to under-record by
currently.
The last time the inner measure over-flowed was an amount over 3 inches, so
this gives an accurate figure.
Watching yesterday's radar, we did seem to catch the heaviest rainfall areas
here, but I'm surprised it was that high a total. Bridlington is the nearest
station for comparison (10 miles due East) and they had 57mm.

--
David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.

David,
You can also measure the rainfall amount by weight.
1cc of water weighs 1 g (strictly at 4C, but close enough at normal surface
temps).
For a 5 inch gauge, devide the weight of collected water measured in grmmes
by 12.6677, to get the rainfall equivalent in mm.
Don't forget to measure the container empty first, or when dry, and of
course, make sure your scales are accurate to the nearest gramme.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.woksat.info/wwp.html
or
www.btinternet.com/~wokingham.weather/wwp.html
"David Mitchell" wrote in message
...
What a time to break my measuring jar, on the way to the gauge at
midnight.
I could only measure the rainfall in cc's - does anyone have a conversion
to
mm's?
My Davis is under-recording currently (haven't yet fixed it) hence the
manual gauge and the Davis recorded 51.6mm!
The manual gauge inner holder had overflowed slightly, only the second
time
I've known this, previous occassion in Penistone with about 115mm - will
check that.

--
David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.

"Bernard Burton" wrote in message
...
David,
You can also measure the rainfall amount by weight.
1cc of water weighs 1 g (strictly at 4C, but close enough at normal
surface
temps).
For a 5 inch gauge, devide the weight of collected water measured in
grmmes
by 12.6677, to get the rainfall equivalent in mm.
Don't forget to measure the container empty first, or when dry, and of
course, make sure your scales are accurate to the nearest gramme.

--
Bernard Burton
Wokingham, Berkshire, UK.

Interesting solution Bernard, thanks for that. I might try it later as there
are some large drops just appearing on the window.

--
David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.