Click here to close
New Message Alert
List Entire Thread
Msg ID: 2599336 standard lapse rate +1/-7     
Author:billnigh
10/27/2019 3:48:31 PM

"The standard lapse rate dosesn't have a thing to do with weather. The standard lapse rate is an engineering standard used for calibrating altimeters, and not much else. Blind use of the standard lapse rate to estimate temperatures aloft can lead a pilot into gross tactical blunders, like descending into an icing condition on the mistaken assumption that it will be warmer down there than it actually turns out to be. The standard lapse rate is science fiction".



Return-To-Index  
 
Msg ID: 2599342 Feel better now that's off your chest ?? (NT) +8/-0     
Author:Adiabatic Al
10/27/2019 4:12:21 PM

Reply to: 2599336


Return-To-Index  
 
Msg ID: 2599364 standard lapse rate +5/-0     
Author:Please.
10/27/2019 5:52:15 PM

Reply to: 2599336

Do your homework.



Return-To-Index  
 
Msg ID: 2599394 standard lapse rate +0/-0     
Author:Be Bop
10/27/2019 8:08:05 PM

Reply to: 2599364

AC 00-6A-Aviation weather.  Find it, read it.



Return-To-Index  
 
Msg ID: 2599797 standard lapse rate +1/-0     
Author:Yeup.
10/30/2019 6:53:10 PM

Reply to: 2599394

BTDT

Many decades past.

Is what it was.  

No interest.



Return-To-Index  
 
Msg ID: 2599381 standard lapse rate +0/-0     
Author:BigT
10/27/2019 6:54:37 PM

Reply to: 2599336

Mr. Way would tell you different.  



Return-To-Index  
 
Msg ID: 2599382 standard lapse rate is simply the mean in the big (NT) +1/-0     
Author:lapse rate bell curve of life
10/27/2019 7:18:20 PM

Reply to: 2599336


Return-To-Index  
 
Msg ID: 2599506 standard lapse rate is simply the mean in the big +2/-0     
Author:oldNtired
10/28/2019 4:30:20 PM

Reply to: 2599382

If you are using the standard lapse rate to determine where the ice is, you probably shouldn't be there !!



Return-To-Index  
 
Msg ID: 2599850 standard lapse rate +2/-0     
Author:wetzigr
10/31/2019 8:07:36 AM

Reply to: 2599336

The issue, even though correctly pointed out by the author that it is overly used in calculations, is in fact a meteorlogical phenomina.  It is called Adiabatic Heating and there are three lapse rates; Dry Adiabatic Lapse Rate of 3 degrees celcius / 1000', Environmental Adiabatic Lapse Rate of 2 degrees celcius / 1000', and Saturated Adiabatic Lapse Rate of 1.5 degrees celcius  / 1000'.  It is important to use the correct lapse rate for the environment that you are flying in for acccuracy purposes.



Return-To-Index  
 
Msg ID: 2600047 what percentage humidity is the cutoff (NT) +0/-0     
Author:from dry to environmental?
11/1/2019 9:38:19 AM

Reply to: 2599850


Return-To-Index  
 
Msg ID: 2600050 Are you saying, an incorrect use of Lapse Rates can lead to (NT) +0/-0     
Author:a Lapse in Judgement? HarHarHar
11/1/2019 9:49:33 AM

Reply to: 2600047


Return-To-Index  
 
Msg ID: 2600051 A Standard Lapse In Judgement Rate! (NT) +0/-0     
Author:Anonymous
11/1/2019 9:50:30 AM

Reply to: 2600050


Return-To-Index  
 
Msg ID: 2600091 what percentage humidity is the cutoff  +0/-0     
Author:wetzigr
11/1/2019 2:28:35 PM

Reply to: 2600047

That is a good question; for a meteorologist!



Return-To-Index  
 
Msg ID: 2600231 you should always give 110% if you want to meke (NT) +0/-0     
Author:it in life
11/2/2019 3:01:25 PM

Reply to: 2600091


Return-To-Index  
 
Msg ID: 2600327 what percentage humidity is the cutoff  +1/-0     
Author:AF WX guy
11/3/2019 3:27:56 PM

Reply to: 2600047

There is no cut-off per se...

There are types of stability -

  • ABSOLUTELY STABLE -  temperature lapse rate is < dry and moist lapse rates
  • ABSOLUTELY UNSTABLE -  temperature lapse rate > dry & moist rates
  • CONDITIONAL STABILITY -  temp lapse < dry & > moist

There's like three more but those are the only ones I remember off the top of my head.



Return-To-Index