[OKDXA] South Orkneys

[Kim Elmore]

These are particularly unusual circumstances!  Polar (not merely 
arctic) air is set in place with a fresh snow pack, light or calm 
winds and clear skies. This maximizes IR radiation (ice is a superb 
radiator at these far IR wavelengths) and we get extremely shallow, 
extremely cold layers at ground level.

I have two thermometers at my QTH: one at about 10 m up my tower, and 
one at about 1.5 m out by my wife's garden. At 10 m, the lowest 
temperature was 0F. At 1.5 m, it was -4F. That's a magnificent 
inversion with a stunning lapse rate (change of temperature with 
height) of +144 deg F per 1000 ft!  Obviously, the layer wasn't 1000 
ft deep, but that's a very strong inversion, all driven by radiation!

Kim N5OP

At 08:49 PM 2/10/2011, you wrote:
>They were reporting them like they were actual temps, but they seemed almost
>to low to be true.  The South Orkneys is warmer than that now-of course it
>is summer there also.
>
>73s John AA5JG
>
>----- Original Message -----
>From: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
>To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
>Sent: Friday, February 11, 2011 2:46 AM
>Subject: Re: [OKDXA] South Orkneys
>
>
> > These are all *actual temperatures.* The Nowata mesonet station
> > actually got down to
> > -31F. One of the stations (I've forgotten which right now) had the
> > lowest ever recorded wind chill of -47F but the others are all actual
> > air temperatures.
> >
> > Kim N5OP
> >
> >
> >
> > At 08:38 PM 2/10/2011, you wrote:
> >>Were these temperatures I am seeing reported the actual temperature or the
> >>wind chill?
> >>
> >>73s John AA5JG
> >>
> >>----- Original Message -----
> >>From: "Nelson Derks" <ac5up at windstream.net>
> >>To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
> >>Sent: Friday, February 11, 2011 1:00 AM
> >>Subject: Re: [OKDXA] South Orkneys
> >>
> >>
> >> > The Mesonet station near Bixby reported an overnight low of -21.5
> >> > degrees @ 7:40 am with an afternoon high of +27 degrees @ 3:45 pm for
> >> > Thursday, January 10th.
> >> >
> >> > Yeah, we know it's cold outside, but work the numbers against the
> >> > clock.
> >> > That's a 48.5 degree swing in approximately 8 hours. Not exactly
> >> > typical.
> >> >
> >> > Visit http://mesonet.org for a temperature near you and more weather
> >> > stats than you ever dreamed possible............ :-P
> >> >
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