What does a passing front usually bring?

Answer 1

changes in temperature, wind direction and speed, barometric pressure and precipitation

Answer 2

I don't know if this will help you or not. You probably should have been a bit more precise with your question, but lets see what we can do.

Cold Front transition zone from warm air to cold air

A cold front is defined as the transition zone where a cold air mass is replacing a warmer air mass. Cold fronts generally move from northwest to southeast. The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.

Symbolically, a cold front is represented by a solid line with triangles along the front pointing towards the warmer air and in the direction of movement. On colored weather maps, a cold front is drawn with a solid blue line.

There is typically a noticeable temperature change from one side of a cold front to the other. In the map of surface temperatures below, the station east of the front reported a temperature of 55 degrees Fahrenheit while a short distance behind the front, the temperature decreased to 38 degrees. An abrupt temperature change over a short distance is a good indicator that a front is located somewhere in between.

If colder air is replacing warmer air, then the front should be analyzed as a cold front. On the other hand, if warmer air is replacing cold air, then the front should be analyzed as a warm front. Common characteristics associated with cold fronts have been listed in the table below.


Before Passing:

Winds - south-southwest
Temperature - warm
Pressure - falling steadily
Clouds - increasing: Ci, Cs and Cb
Precipitation - short period of showers
Visibility - fair to poor in haze
Dew Point - high; remains steady

While Passing:

Winds - gusty; shifting
Temperature - sudden drop
Pressure - minimum, then sharp rise
Clouds - Cb
Precipitation - heavy rains, sometimes with hail, thunder, lightning
Visibility - poor, followed by improving
Dew Point - sharp drop

After Passing:

Winds - west-northwest
Temperature - steadily dropping
Pressure - rising steadily
Clouds - Cu
Precipitation - showers then clearing
Visibility - good, except in showers
Dew point - lowering