Imp Check Flashcards
Geostrophic winds experiences what forces
2forces
Px gradient force
Coriolis force
Geostrophic winds are ___ to isobars
Straight and parallel to isobars
Gradient winds experiences what forces
3 forces
Px gradient force
Coriolis force
Centrifugal force
Gradient winds are ___ to the isobars
Curved to the isobars
When are gradient winds stronger than Geostrophic winds
In high Px systems (anticyclones), where centrifugal force assists the PGF
Squall > Gust
True or false
True
Squall - inc in windspeed which lasts for a few min (also associated w Cb clouds)
Gust - inc in windspeed which lasts or a few sec
Lull ?
Dec in windspeed
Surface winds are ___ to the isobars
Blow across the isobars, cutting through them
Since in the friction layer , CF reduces (v reduces)
PGF increases and pulls the Geostrophic winds (which were straight and parallel to the straight isobars initially) towards it
Surface winds rule
30deg and 50% rule
Backing of 30deg and 50% Dec in windspeed in the friction layer (LAND)
10deg backing (SEA)
If the S is warmer than the N, level by level from surface up to higher levels then the ____ winds will strengthen w ht w no change in direction in N/H
Westerly winds
Resultant wind that blows under the influence of PGF, Geostrophic force and cyclostrophic force is called
Gradient wind
What does halo signify
Predominance of ice crystals and negligible chances of ice accretion
To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which ___
Halo
NS clouds occur at ____ front
Warm front
Lenticular clouds indicate presence of
____
Mountain waves
