Transcript Weather Hazards PowerPoint

Weather Hazards
By: Lisa Mozer
Fronts
After drawing isobars (and isotherms), we
can now identify where low pressure, and
high pressure, centers are located and
where cold air is moving in, and areas where
warm air is moving into
Please remember:
Wind is named by the
direction it is coming from.
Focus on North and South wind
North wind is associated with colder air,
and southerly wind is associated with warmer air.
In this diagram south wind is over the
southeastern areas of the US, and over the
central area of the US the wind is out of the north.
The circulation around a surface Low pressure
center is referred to as cyclonic.
The cold front is a symbol that represents the
leading edge of the cold air.
In the diagram above the colder air is in place
over the central states. This cold sector of the
Low, and is referred to as the
back side of the Low and the cold sector
The horizontal perspective
It’s important to understand
The vertical and horizontal
dynamics of colder
air moving into an area and
located on the back side of
Low pressure and in the cold
sector.
Imagine this is you (or me)
in the next slide.
See the small circle inside the square? It
represents you standing in the warm sector,
and ahead of the cold front.
warm sector with
south wind
cold sector
with north wind
In this diagram (above) we are
looking down onto the atmosphere and
we can only see the top of your head. Next,
look at you In the vertical perspective
on the next slide
The vertical perspective
Here below we can see all of you (look below) standing in the warm air
sector. The cold air is moving in. At the front edge of the cold air storm
cloud development is most likely. This is were thunderstorms are
expected and the clouds build.
Warm air
Review this presentation again; making sure you understand what cyclonic circulation
Is referring to (it’s important to understand).
See the small circle inside the square? It
represents you standing ahead of the warmer
air.
warm sector with
south wind
cold sector
with north wind
In this diagram (above) we are
looking down onto the atmosphere and
we can only see the top of your head. Next,
look at you In the vertical perspective
on the next slide
The vertical perspective ahead of warm air...
In this diagram, we see the vertical perspective again. You are standing ahead of
warm air. The leading edge of the warm air is not inducing the storm clouds
like the leading edge of the colder air in a previous diagram. It is common to get light
rain (and even snow) ahead of the warm front.
Next , look at the video on Air Flow and Circulation.