Scaffolded notes
Build the idea
Station models compress observations
A station model places several observations around one location: temperature, dew point, pressure, cloud cover, wind direction and speed, and present weather. The wind staff points toward the direction the wind comes from. A simplified key is necessary to decode the symbols.
Isobars connect equal pressure
Isobars are lines connecting locations with the same air pressure. Closely spaced isobars show a stronger pressure gradient and often stronger wind. Closed contours can reveal high- and low-pressure centers.
Patterns reveal fronts
Meteorologists compare neighboring stations. A narrow zone with rapid temperature, dew-point, and wind-direction changes may mark a front. Pressure patterns and precipitation observations add supporting evidence.
Stop and explain
Check your thinking
1. What do tightly packed isobars suggest?
Possible response: A strong pressure gradient and potentially stronger winds.
2. What evidence besides temperature helps locate a front?
Possible response: Dew point, wind shift, pressure pattern, clouds, or precipitation.
Interactive challenge
Try the science
What do very closely spaced isobars most strongly indicate?
Before you leave
Exit ticket
Name three observations that may change across a front.