Is it colder at the approach end of the runway?

re spending money to figure that out. I thought that was common
knowledge.

Well, sometimes things that are common knowledge are incorrect.

Jose

Jose, you sound like your buddy MX. When I returned from luch today I
walked
from a concrete parking lot over about 10 feet of grass to enter the
building. I did not need airborne equipment to tell me it was warmer
over
the concrete than it was over the grass.

Well, yeah, but I wouldn't use that to make the decision as to whether
or not huge piles of money should be spent to combat global warming.

I think we need something from traceable, calibrated instruments with
error bars on the numbers, which is what hopefully the airplane is
getting.

--
Jim Pennino

Just to add a little more "food for thought" to the Global Warming issue: I
recently heard another of those poorly attributed sotries on radio. In this
case, it seems that some of the Siberian reporting stations were
abandonned--so the subsequent data was merely compiled without them...

As to the original question, I presume that the road near the approach end
of the runway is simply in a less built-up area that the rest of Chris'
Dad's morning commute. That would be nothing new; there has been a very
noticeable change of temperature in less than a quarter mile--in that type
of transition--for as long as I can remember. With the windows open, you
can suddenly wonder if you should have brought a jacket...

Peter

Robert M. Gary wrote:

I live near Sacramento where we have long periods of 100+ degree
temps. The gov't has been doing research here on the affect of asphalt
and roofs (not sure why) on temps. They fly a plane overhead in the
afternoon with sensitive heat detecting equipment. They seem to
believe the city is much hotter simply because of the pavement and the
roofs.


Don't know why they'd be studying it in Sacramento. Here in Phoenix it has
long been known as the "Heat Island". Basically, asphalt, roofs and concrete
absorb much more heat than dirt or grass. The result is that this excess
heat is liberated slowly after the sun goes down and raises the overnight low
temperature in populated areas.

If you live in a rapidly expanding desert town long enough, it's easy to
see. When I moved here, there were about 1.5 million people in the metro
area. During the hottest part of the summer, overnight low temperatures
stayed in the mid to upper 80s. Nowadays, we have about 4 million people and
the overnight lows stay in the low to mid 90s at the peak of summer. Daytime
temperatures haven't shown any corresponding increase.

John Galban=====N4BQ (PA28-180)

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