why high to low, look out below?

jim rosinski wrote:
[...] I never claimed that temperature effects don't exist.
Only that the "high to low, look out below" phrase in piloting texts
generally refers to pressure effects, not temperature effects. That's
the only sense in which I disagree with the cited article.

In texts that avoid going in-depth, you're right that they ignore the
temperature effect. But other references use it for both meanings, and
it's knowledge worth having.

Type the phrase into Google, and you'll find many sites, including AOPA
and at least one aviation mnemonic collection, that use it for both
pressure and temperature. A lot of us learned it that way, too.

I thought Mr Duniho did an excellent job of explaining both effects to
the OP.

Kev

"jim rosinski" wrote\ Here's what Jeppeson's
Instrument and Commercial textbook (2003 edition)
has to say on the subject (page 2-20 on Altimeter Setting):

"The most common altimeter error is also the easiest to correct. It
occurs when you fail to keep the altimeter set to the local altimeter
setting.

That's pilot error. Altimeters have accuracy errors quite independent of
that. Temperature errors are discussed in every level of ground school
training.

moo

jim rosinski wrote:

Matt Whiting wrote:

http://math.isu.edu/~wolperj/cold.html

Do you want to admit now that you are wrong or keep arguing? :-)


Well if someone, somewhere, says something on the web then it *must* be
true :-) Actually the web page you cite is a good one and I recommend
folks read it. I never claimed that temperature effects don't exist.
Only that the "high to low, look out below" phrase in piloting texts
generally refers to pressure effects, not temperature effects. That's
the only sense in which I disagree with the cited article.

I still disagree with "generally." During my search I found at least as
many that referred to both temperature and pressure as I did that
referred to pressure alone. And since the mnemonic DOES in fact apply
equally well to both parameters, then I believe that the books that
reference pressure changes only are seriously in error.


Matt

It is clear that they meant both pressure and temperature.


"jim rosinski" wrote in message
news:uRwdf.2687$Mr4.335@trnddc08...
| Peter Duniho wrote:
|
| The phrase in question says nothing about pressure at
all. The word
| pressure is not even used.
|
| My apologies to the group for so immediately violating my
own stated
| rule to ignore this person's posts forever more. But I
just can't sit
| back and let him spew utter nonsense without challenge.
Good GOD man,
| when you see the phrase "high to low, look out below" in
an aviation
| book they mean high to low PRESSURE. They assume the
reader has the
| intellectual wherewithall to take it from context when
they see the big
| high and low pressure icons on the same page!
|
| BTW, the moral of the whole "high to low (pressure), look
out below"
| thing is to make sure on a cross-country or IFR flight to
get altimeter
| setting updates regularly.
|
| Jim Rosinski

"jim rosinski" wrote in message
news:uRwdf.2687$Mr4.335@trnddc08...
[...] Good GOD man, when you see the phrase "high to low, look out below"
in an aviation book they mean high to low PRESSURE.

Funny how those who are most strident and insulting also tend to be the most
ignorant as well. I wonder why that is...

Regardless of what you may think, the phrase is applied to both the pressure
situation as well as the temperature situation.

[...]
BTW, the moral of the whole "high to low (pressure), look out below" thing
is to make sure on a cross-country or IFR flight to get altimeter setting
updates regularly.

That's certainly one moral. However, getting a fresh altimeter setting
isn't going to help you correct for temperature errors. Best you know about
those as well.

Pete