forecasting weather - flipped out science! laura thomas€¦ · stations station a –air pressure...
TRANSCRIPT
FORECASTING
WEATHER
How do you predict the future?
8.10B identify how global patterns of atmospheric movement influence local weather using maps that show high and low pressures and fronts
WATCH THIS WEATHER FORECAST
If clicking on the picture
doesn’t launch the
video, look for the link
below these notes on
the teacher website –
called “Explaining a
weather forecast”.
INTRO TO WEATHER MAPS -
Look a the map and look at
the lines around the high
and low pressure systems.
An area of high pressure
(H) is a place where cool,
dense air is falling.
An area of low pressure (L)
is a place where warm, less
dense air is rising.
Pressure differences cause
air to move.
LET’S EXAMINE WEATHER TOOLS
AND WEATHER SYMBOLS
Weather forecasting is the analysis of scientific
data to predict future weather conditions
Meteorology – the study of weather and Earth’s
atmosphere
WEATHER TOOLS
Thermometer – temperature
A barometer measures air pressure. It tells you
whether or not the pressure is rising or falling.
An anemometer measures wind speed. The
cups catch the wind, turning a dial attached
to the instrument. The dial shows the wind
speed. (you used one the other day!)
WEATHER TOOLS
A HYGROMETER measures the water
vapor content of air or the humidity.
WEATHER SATELLITES are used to
photograph and track large-scale
air movements. Then meteorologists
compile and analyze the data with
the help of computers.
WEATHER MAP SYMBOLS:FRONTS AND PRESSURES
High Pressure –
Low Pressure –
Cold Front -
Warm Front –
Stationary Front –
Occluded Front -
Make sure you
have these in your
notes!
Weather Map Symbols: Isobars1. Isobars are lines on a map that connect areas of equalatmospheric pressure – the units are in millibars (ex. 1000 mb)
2. The highest wind speeds are found where the isobars on a weather map are spaced closesttogether
Weather Map Symbols: Isobars3. The isobars show air pressure changes over an area
4. The closer the isobars = higher the wind speeds
5. The farther the isobars = slower the winds speeds
WINDS AND AIR PRESSURE
wind patterns - when
temperature increases,
pressure decreases;
when temperature
decreases, pressure
increases;
the result is convection
currents which cause wind
WHAT IS THE JET STREAM?The jet stream is a “river” of air with excessive speeds up to
200+ miles per hour. Weather systems caught in it are
steered by it.
the location and speed of the jet streams changes along
with the season.
High and low pressure systems are “pushed around” by this
stronger stream of air
THE JET STREAM -During the winter, storms are pushed south, the polar jet
stream brings cold air from the polar regions further south
During the summer, the subtropical jet stream is formed from
warm air masses and has less of an impact on the weather
STATION MODELS
A station model is a set of
meteorological symbols that
represent weather at a station.
Placing station models on a
map makes is possible to see
large weather patterns.
WIND DIRECTION
Winds are named for the direction that they come FROM
Wind direction is shown as the arrow extending from the circle (that shows cloud cover) toward the direction from which the wind is blowing.
Here is an example…
The symbol highlighted in
yellow (in the diagram) is
known as a "Wind Barb". The
wind barb indicates the
wind direction and wind
speed.
Wind barbs point in the
direction "from" which the
wind is blowing. In the
diagram, the orientation of
the wind barb indicates
winds from the Northeast.
Westerly Wind
WIND SPEED -
The wind speed is
plotted as feathers
(lines) and half-feathers
(half-lines) representing
10 and 5 knots, on the
barb on the wind
direction arrow.
RECAP ON WEATHER
FORECASTING
Link: https://www.youtube.com/watch?v=FdaD-a53sio
Weather Forecasts
WEATHER MAP PRACTICE STATIONS
You will move from station to station to answer
the questions on your page
Behavior expectation – act with integrity to
complete the work – you have today only!
Keep these notes and stations work – you will
need them for the activity next class.
STATIONS
Station A – Air Pressure and Fronts (Parts I-III)
Station B – Weather Maps A and B (answer questions)
Station C – Weather Maps – forecast practice/weather conditions (2 different maps and questions)
Station D – videos and questions (if you don’t finish the videos, complete this one at home)
Station E – Weather Symbols (matching and chart)
Note – there are keys to these stations, IF you get finished, you may check your work against the keys ☺. You must show the completed work to the teacher first!