Atmospheric Pressure Flashcards
(22 cards)
What is MSL mean?
Mean sea level pressure
a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
Isobars
Closely spaced isobars mean..
Steep pressure gradient and strong winds
Widely spaced isobars mean
a Shallow pressure gradient and relatively light winds
The pressure over a given distance can be difined as a:
Pressure gradient
29.92 hg it’s aquel to?
- 325 kpa kilopascals
1013. 25 mb millibars
What is station pressure
It’s the actual weight of the column of air extending upwards from station to the outer limit of the atmosphere of the observing station
For a change of 1000 feet of elevation make a changes of how many inch on the barometer reading
1 inch
The change in pressure over a given distance can be defined as?
Pressure Gradient
The closer the isobars are together …..
The greater the pressure gradient
The steeper the pressure gradient ….?????
Stronger the wind
What are Troughs?
This is a elongated(extended)area of low pressure at the surface or aloft
On a map Browns das bar associated with bad weather
What is a windshift
A change in wind direction of 45 degrees or more in less than 15 minutes with sustained wind speeds of 10 knots or more throughout the
What is a Ridges
These are areas of elongated(extended) high pressure with a low pressure on each side.fair weather is associated
Anticyclonic pressure systems in the northern hemisphere represents
Sinking air that is rotating clockwise and flowing outward from the center
Density altitude ?
This is the pressure altitude and actual temp conditions corrected for nonstandard temp variations and is the height the aircraft feels it is at above sea level
High density altitude means
The aircraft feels like it is a higher altitude
When conditions are standard pressure altitude and density altitude are???
The same
When the air temp is above standard density altitude will be??
Higher than pressure altitude
Pressure Gradient
The change in pressure over a given distance.
The distance and location of these isobars relative to one another give us important information about hoe the air is moving
The closer the isobars are together?!
The greater the pressure gradient
Aloft means
Higher or up in the air
