On Feb 16, 11:14 am, Conor wrote:
In article 14a70221-85b4-463d-bc43-2e50cf7b54fc@
60g2000hsy.googlegroups.com, Weatherlawyer says...



Ian wrote:
On 16 Feb, 07:37, "T" wrote:
Sorry this is a rather lazy question.

I planned to test out my brand new DSLR in the Wey Valley at sunrise this
morning but overslept. ?Did any hardy souls out there see much hoar frost
worthy of early trip tomorrow ? ?My back garden station (Burpham, Surrey)
indicated a min of -5.4c last night so no lack of cold air.

Air is too dry for heavy hoar deposits, probably be the same
on Sunday morning. Have fun setting that alarm for 05:00z

It's usually chilliest just at dawn, or just after is it not?

No. It's between 4-5am.

There must be a reason why it feels colder at dawn then. Would it be
regionally specific, I wonder?

As the frost forms around 4 to 5 am, the latent heat is swept away
according to the laws of physics. On a calm morning it will get
momentarily warmer and just at about the time most people become aware
of it, the temperature drops back down to the pre latent heat
temperature?

Whatever the reason, there has to be reason.

As a Brit I'd like to thank the Americans for their help in the war
against terror because if they'd not funded the IRA for 30 years, we
wouldn't know how to deal with terrorists.

They only stopped funding terrorism in Britain because Tory BLiar
promised to terrorise Iraq.

In that TV show that took the lid off the causes of the war about a
year ago, he looked like he'd just been freshly buggered. Must have
been when the impact of what he'd agreed to behind our backs hit home.