700hpa?

[Bottesford]

Just looked thru the guides section & didn't find any info on this type of chart from the GME - RH700: http://www.wetterzentrale.de/pics/Rgme003.gif

What does it mean? Doesn't seem to relate to temperatures or precip.

Cheers!

[summer blizzard]

Although i do not know what it is, you can clearly distinguish the occluded front approaching the west of Ireland.

[kold weather]

I believe it shows how humid the air is,with 100% being the most humid and 0 being the most dry.

and yes SB,the front is obvious to see,this where some more moist air is located,which isn't suprising considering its a front!

[summer blizzard]

For some strange reason, the south of England is not very humid, because of this, i suspect the front will give little rain to the south of England.

[Bottesford]

Ah yes- RH = Relative Humidity! As you'd expect the relative humidty is higher in colder air further north.

[Adi F]

This chart is quite unusual normally it would be the 700 MB relative humidity. 700 MB is about 10000ft above mean sea level and the vast majority of cloud cover in a developing frontal system is found between 5000 an 15000ft MSL, so by looking at humidity is a good measure of synoptic scale lift. It is possible to work out extent of cloud cover.