Met - Local Winds Flashcards
Are costal areas subject to diurnal variation in temp and wind …..
not as much as inland since it takes much longer for the ocean to heat up and cool down so there is more stability
Do anabatic winds effect operations …..
no they are of no significance to aviation
Diurnal Variation means …..
The variations that happen in a 24 hour cycle
Diurnal variations in temp and wind change because of 4 main factors, name them …..
- Arrival of cold fronts
- Windy conditions
- Cloud cover
- Humidity
What do katabatic winds do to the land breeze in the mornings …..
they reinforce the land breeze
Katabatic winds are strongest in the …..
mornings
Describe how a low level jet stream forms …..
- at night cold air sinks into undulations in the ground
- the top of the cold layer near the ground is very smooth
- The smooth layer eliminates surface friction and the gradient wind can increase by 40-50kts above 2000ft
Describe how a sea breeze forms …..
- The land heats up faster in the day than the ocean
- an area of low pressure is formed locally
- the cool mosit air from the sea moves in creating the sea breeze
In relation to a katabatic wind:
what is more important, the temp or the difference in temp
the difference in temp
The 3 ideal conditions for a katabatic wind are ……
- High pleatau and steep slope
- Clear skies allowing maximum heat loss
- Warm surrounding air
In Australia low level jet streams are most prevalent …..
on the western side of the great dividing range during winter at dawn
Anabatic winds are ….. because …..
weak, they have to fight gravity
Land breezes are strong T/F …..
False they are gentle as there is a lesser gradient
Diurnal Variation in temp and wind at higher latitudes are more likely to be controlled by …..
the passage of cold fronts
What type of winds do sea brrezes form ….
strong onshore winds
