Bgs Facts Flashcards
Polar ice caps creates what type of air mass
Arctic
What is different in the core of the TRS than the surroundings
Core is warmer than the surrounding air
Eye of a hurricane
Lower than 63kts
Descending air, thus no clouds
Where are cyclones formed
Bay of Bengal
Wast side of an easterly wave are thunderstorms most likely to form
Easterly side
Above and below an inversion, what is likely to happen to the wind
Change significantly in speed and direction
Height of strongest mechanical turbulence
250ft
When do tornadoes form
In N America, spring/summer
What is a gust front
Cold air outflow from a ts
When is rvr reported
When visibility decreases below 1500m
Triangle symbol on wx charts
Hail
What met messages are produced in ATIS
Met report and specials
What happens to the speed of a polar front in winter
Increases
When is a polar front jet speed the fastest
Between a ridge and a trough
Can airframe icing form in clear air
Yes
Pressure altitude
1013.25
Saturation mixing ratio
Number of grams of water it contains per KG of air.
Increases exponentially with temp
% of air in the lower troposphere that consists of WV
0-5%
Mostly likely reasons for stratus to be dispersed
Insolation, resulting in the lifting of the condensation level
Capillatus
Hairy top like an anvil
Fractus
Broken in pieces
Humilis
Small vertical extent
Towering cumulus
Great vertical extent
Cauliflower
BCFG
Patchy fog
Amount of hurricanes in N America per year
6
Tropical downpour can reduce vis to
Tens of meters
What can low level windshear be associated with
Passage of a cold front
Duration of a microburst
1-5mins
Weather to be included in a special air report
Severe mountain wave Sever dust/sand storms Mod and severe icing EMBD,TS, Volcanic ash clouds
600hpa FL
FL140
