1. Predicting Weather
© Copyright 2010.  M. J. Krech. All rights reserved.

2. Cold Front
In the US, most Cold Fronts travel in a west to east direction across the country.

3. Cold Front
As a Cold Front passes, the wind will normally shift from a southerly to a northerly direction.

4. Cold Front
Another indicator of an approaching Cold Front is the presence of Cumulonimbus Clouds.

5. Cold Front
Colder weather occurs after a Cold Front has passed.

6. Warm Front
In the US, most Warm Fronts travel in a west to east direction across the country.

7. Warm Front
SSW behind front
SSE ahead of front
When a Warm Front passes, the wind will normally shift from an east-southeast to south- southwest direction.

8. Warm Front
Another indicator of an approaching Warm Front is the presence of Nimbostratus Clouds.

9. Warm Front
Warmer weather occurs after a Warm Front
has passed.

10. High Pressure H
A High Pressure system is an area that has diverging, sinking winds and a clockwise rotation.

11. High Pressure
Fair weather is typically associated with high pressure.

12. High Pressure
Rising pressure indicates sunny weather is approaching.

13. Low Pressure L
A Low Pressure system is an area that has converging, rising winds and a counter-clockwise rotation.

14. Low Pressure
Stormy weather is often associated with low pressure systems.

15. Low Pressure
Sinking pressure indicates rainy weather is approaching.

16. Stationary Fronts
A stationary front forms when a cold front or warm front stops moving.
Two masses of air are pushing against each other but neither is powerful enough to move the other.
Winds blowing parallel to the front instead of perpendicular can help it stay in place.
Differences in temp. and wind on opposite sides; can be cloudy and rainy.

17. Occluded Fronts Cold fronts move faster than warm fronts.
At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front.
The warm air rises as these air masses come together.
Occluded fronts usually form around areas of low atmospheric pressure (rain).

18. The End