1. Weather Forecasts

2. Data collected from the atmosphere
The National Weather Service counts on two sources for information:
Data collected from the atmosphere
Data collected from the Earth’s surface
Weather Balloon
Radar
Weather balloons are used to collect data from the atmosphere. They have different instruments attached to them that will record temperature, humidity, air pressure, etc. Radars are used to collect data from the Earth’s surface.

3. In order to forecast the weather, meteorologists make measurements of:
temperature
winds
air pressure
humidity
precipitation
Meteorologists are people who study the weather. They collect data in order to forecast weather.

4. Instruments used to measure precipitation:
Rain Gauge
Snow Gauge

5. Instrument used to measure temperature:
Thermometers

6. Instrument used to measure humidity:
Psychrometer

7. Instrument used to measure wind speed
Anemometer

8. Instrument used to measure wind direction:
Wind Vane

9. Instrument used to measure air pressure:
Barometer

10. When meteorologists gather up data, it is recorded on a map using a combination of symbols, forming a STATION MODEL.
After collecting data, meteorologists create station models.

11. Isobars are lines that connect equal atmospheric pressure .
Meteorologist use the air pressure measurements to identify areas of high and low pressures. They are represented in a map as isobars..
These lines show the areas of high and low pressure.

12. L Pressure Changes with Temperature
Air flows in a clock-wise direction on the surface of the Earth.
Cold, dense air sinks to the surface of the Earth.
Airs flows in a counter clock-wise direction at the surface of the Earth. L
Warm, less dense air rises forming clouds
Pressure Changes with Temperature

13. Pressure Gradients
There are many areas of high and low pressure above the Earth’s surface due to uneven surface heating creating pressure gradients.

14. Air moves from high pressure to low pressure forming winds.

15. The closer the isobars, the stronger, the winds blow.
The more spread out the isobars, the gentler the winds.

16. Fronts are draw as lines and symbols.
Using the station models meteorologists can then predict or forecast the weather. They use computers to create weather maps using a combination of symbols.

17. H L What will happen to the weather in Denton?
Which direction is the warm front moving?
25°C
28°C L H
40°C
29°C
45°C
Warm Front H
High Pressure
Occluded Front L
Low Pressure
Cold Front
Stationary Front

20. The closer the isobars, the stronger the winds blow.
STATION MODEL is created when data that is collected is recorded on a map using a combination of symbols.
Symbols for Fronts
The closer the isobars, the stronger the winds blow.
The more spread out the isobars the gentler the winds.
Isobars are lines that connect equal atmospheric pressure .
There are many areas of high and low pressure above the Earth’s surface due to uneven surface heating creating pressure gradients.
Air moves from high pressure to low pressure forming winds.
Air flows in a clock-wise direction on the surface of the Earth.
Cold, dense air sinks to the surface of the Earth.
Airs flows in a counter clock-wise direction at the surface of the Earth. L
Warm, less dense air rises forming clouds
Cold, dense air sinks to the surface of the Earth
Warm, less dense air rises forming clouds
Air flows in a clock-wise direction on the surface of the Earth in High Pressure areas.
Airs flows in a counter clock-wise direction at the surface of the Earth in Low Pressure areas.