chionomaniac

Thank you for that clear explanation, John' which has helped me to understand adiabatic lapse rates a little bit better. c

. Edit: An anomalously warm North Atlantic would presumably also have the effect of moving the polar jet northwards.

The Fohn effect is an example of adiabatic heating. I didn't have a clue what that meant until I came across this link: http://en.wikipedia.org/wiki/Adiabatic_process c

I reckon my guess will be beaten before the 5th day of winter looking at the latest runs!!

I am going on a holiday soon with my friend the mod Ern Eravitch. We are taking a southerly jet followed by a northerly. Plunge pools are great when away, Ern prefers a hot dip but I prefer open air cold pooling. Mind you watch out for bears. Last year somone from our ensemble almost got attacked by a beast from the east.

15.3 Fohn effect Colwyn Bay 19th Feb 2.37pm

After discussing how the met office position troughs on fax charts from t24 with John Holmes in a separate thread I subsequently emailed the met office and here is their reply: Its a bit of a general answer but I hope I am right in assuming that forecast=fax charts rather than the model output. If that is right and fax charts are computer generated how does that account for the times when the metoffice produce fax charts that go against what their own models produce? c

If this is open to anyone then I would like to go for 4.7 please This is one degree above solar min average since 1933 .... ie I plucked it from thin air! Thanks C

Thanks Essan, sometimes the answer is so obvious that you dont think its right!

Thanks for the replies guys. Does anyone know why they are called fax charts? Is it something as simple as this: "Fax (short for facsimile, from Latin fac simile, "make similar", i.e. "make a copy") is a telecommunications technology used to transfer copies (facsimiles) of documents, especially using affordable devices operating over the telephone network." (courtesy of wikipedia) so that the info could be shared quickly - or is there a hidden meteorological meaning?

Thats a lot of information to sift through to produce 10 fax charts every 12 hours!

Charts have updated since but I originally chose UKMO 0z for 20/11 for demo purposes as I still haven't worked out how to upload the charts!! I'm sure I'll soon work this out!! Any help on this gratefully received.

I have another question for the experts who kindly helped me in the past. I know the Fax charts are the version that the professionals produce once they have interpreted their own supercomputers model output. But what does Fax actually stand for? And (I hope this works) how do the met office forecasters get from this: http://www.netweather.tv/models/meto/20071...ages/met.72.png to this? http://212.100.247.145/fax/PPVK89.png thanks

Thanks brickfielder the 500hPa chart you have posted will hopefully allow me to make a quick educated guess where the jet is positioned before confirming this on the 300hPA wind charts.

Thank you for your replies. I have just signed up to netweather extra - the amount of available info is impressive! It is useful to see the 300hPa chart together with the slp. WIB thanks for this link to TWS BI snow set up article. I have previously read this excellent post a number of times - essential reading for a novice like myself!

I wonder could any netweather experts please help me. I have a question regarding the PFJ. Is it possible to work out from the 500hPa charts where this jet boundary is positioned or do I have to refer to the 200hPa or 300hPa wind charts to work this out? I often find these difficult to read when the jet stream is fragmented. Or am I looking in completely wrong place altogether? Many thanks in anticipation.

I posted in the history section earlier and would like to know who back in 1987 was responsible for drawing in the pencil isobars on the the original met office charts that I have shown on 16 10 1987 at 06z when the local weather stations started recording the data of the great storm? I don't know how to post a link to the history section but would still be interested how the met office worked before the days of instant information on the internet. Were there many copies taken of this original document and would any of the original met office staff be interested in seeing one of the originals again? Ed

I sadly missed the great storm of 1987 as I lived in Liverpool at the time. I remember waking up and hearing all the reports on the radio but sadly( and luckily) the reports that the storm was heading our way proved to be untrue. We had no more than a gentle breeze!! Later I have been lucky enough to be given the met office chart from 0600 on the 16th with signed autographed photos of the original met office team!!! I am going to try to upload photos I have of this . Perhaps John Holmes would be good enough if he comes across this thread to reminisce and confirm that the pencil isobar scrawling is how they used to draw the charts back then. Ed