Winds Flashcards
In S hemisphere if an observer faces wind, low will be to his ……
(a) Right
>(b) Left
In N hemisphere due to rotation of earth winds are deflected to …………….
(a)Left
> (b) Right
Local Winds follow Buys Ballots law………..
(a) True
(b) False
> (a)False
(B)True
Coriolis force acts perpendicular to the ……… of wind direction in N hemisphere
(a)Left
>(b) Right
Geostrophic wind is due to the balance between the forces ………
(a) Coriolis and Frictional
(b) Pressure gradient and Cyclostrophic
>(c) Pressure gradient and Coriolis
Coriolis force is strongest at ……
(a) Mid latitudes
>(b) Poles
(c) Equator
Geostrophic rule breaks down at…………
(a) Mid latitudes
(b) Poles
>(c) Equator
Fohn winds are ……….. on the Leeward side of a mountain.
> (a) Dry &Warm
(b) Cold & Humid
The wind sliding down a hill during night is called ………. wind.
(a) Fohen
(b) Anabatic
>(c) Katabatic
With the onset of sea breeze there is a ……… in temperature and ………… in RH.
> (a) Fall/Rise
(b) Rise/Fall
(c)Fall/Fall
Sea breeze sets in by ……….. and dies off at ………..
(a) Night/Day
>(b) Day/Night
(c) Both Day and Night
If an aircraft in N-hemisphere flies from H to L it will experience ………
> (a) Starboard drift
(b) Port drift
In N-Hemisphere if you experience Port drift, altimeter will read
> (a) Under
(b) Over
In N-Hemisphere if you experience Starboard drift, altimeter will read
(a) Under
>(b) Over
Lines of constant wind speed drawn on weather charts are called
(a) Isobars
>(b) Isotachs
(c) Isogons
Squall are distinguished from gusts by:
(a) Shorter duration
>(b) Longer duration
(c) Lower wind speed
The thermal wind is:
(a)The wind that blows because of thermals
(b)The warm wind that blows down the hill on the leeward side
(c)The wind which must be added vectorially to the lower level geostrophic wind to obtain the upper level geostrophic wind
(a)The wind that blows because of thermals
(b)The warm wind that blows down the hill on the leeward side
>(c)The wind which must be added vectorially to the lower level geostrophic wind to obtain the upper level geostrophic wind
On a weather map if isobars are closely packed, the surface winds are likely to be
(A)Light and parallel to isobars
>(B)Strong and parallel to isobars
(C)Strong and blowing across the isobars
Anabatic wind occurs
(a) At night
(b) Any time of day and night
>(c) During day
Anabatic wind is stronger than katabatic
(a) True
(b) False
(a) True
>(b) False
Katabatic wind is down slope cold wind due to nocturnal cooling
> (a) True
(b) False
Katabatic wind occur due to sinking of cold air down the hill slope
> (a) True
(b) False
Anabatic wind occur due to downward movement of air along valley
(a) True
(b) False
(a) True
>(b) False
Sea breeze is stronger than land breeze
(a) True
(b) False
> (a) True
(b) False
The wind blows clockwise around a low in N-hemisphere
(a) True
(b) False
(a) True
>(b) False
The wind blows clockwise around a low in S-hemisphere
(a) True
(b) False
> (a) True
(b) False
The wind blows anticlockwise around a low in N-hemisphere
(a) True
(b) False
> (a) True
(b) False
The wind blows anticlockwise around a low in S- hemisphere
(a) True
(b) False
(a) True
>(b) False
The resultant Wind that blows under the influence of pressure gradient force, geostrophic force and cyclostrophic force is called
> (a) Gradient wind
(b) Geostrophic Wind
(c) Cyclostrophic wind
Due to friction, from day to night for an isobaric pattern (in N hemisphere) the surface wind backs and weakens
(a) True
(b) False
> (a) True
(b) False
The winds which spirals inward counter-clockwise in the N Hemisphere are associated with
(a) Turbulence
(b) High pressure area
>(c) Low pressure area
Lower level wind 05010 kt, upper level wind 23005 kt, what is the thermal wind
(a) 05005 kt
>(b) 23015 kt
(c) 05015 kt
A change in wind direction from 310° to 020° is
(a) Backing
>(b) Veering
A change from 270° to 250° is
> (a) Backing
(b) Veering
Sudden changes in wind speed from 10 kt to 30 kt and then to 15 kt are
> (a) Gust
(b) Squall
(c) gale
Sudden change in wind speed from 10 kt to 30 kt for 2 to 3 minutes are
> (a) Squall
(b) Gust
A significant wind shear is generally associated With TS or line squall
(a) True
(b) False
(a) False
>(b) True
Cyclostrophic wind gives a good approximation of the 2000’ wind in an intense tropical storm
> (a) True
(b) False
Rotor clouds have extremely turbulent flying conditions
(a) False
>(b) True
Friction causes winds to flow cross isobaric by ………. over land and ……… over sea
(a) 20°/10°
>(b) 30°/15°
(c) 40°/30°
If the S is warmer than the N, level by level, from surface up to higher levels then the…….. wind will strengthen with height with no change in direction in N hemisphere
(a) Ely
>(b) Wly
(c) Sly
(d) Nly
Gradient wind is a ……. of the geostrophic Wind in an anticyclone
(a) Under estimate
(b) Accurate
>(c) Over estimate
Gale is
(a) Persistent strong winds with mean speed 44 kt, associated with thunderstorm
(b) Marked increase in wind speed lasing few minutes associated With CB or DS
>(c) Persistent strong winds exceeding 33 kt, associated with depression
In N hemisphere thermal wind is parallel to ………. with low value to left
(a) Isobars
>(b) Isotherms
(c) Isallobars
The inertial flow is
(a) cyclonic in both the Hemispheres
>(b) anti cyclonic in both the Hemispheres
(c) anti cyclonic around an anticyclone
Upper level wind is 24025 kt, lower level wind is 06015 kt, the thermal wind is?
(a)16010 kt
>(b) 24040 kt
(c) 24010 kt
