Pressure systems, fronts and weather maps
Grade 9 Science Worksheet - Building Confidence
Circle the best answer.
Where isobars are close together, what is the wind like, by Bo's reading (NOAA)?
- Weaker, since the gradient is small
- Blowing straight up
- Stronger, since pressure changes quickly
- Calm, since the lines crowd out the moving air
Air is pushed from which pressure toward which, by Kira's reading (NOAA)?
- From cold places toward hot ones
- From high pressure toward low pressure
- From low pressure toward high pressure
- Straight along each isobar, with no push
What weather usually comes with high pressure, by Jun's reading (NOAA)?
Use the picture in question 2.
- Fair weather, as sinking air warms and clouds evaporate
- Thunderstorms each day
- Clouds and steady rain, as air rises and cools over the area
- Snow, as air rises and cools
In the Northern Hemisphere, which way does wind circle a low, by Milo's reading (NOAA)?
- Clockwise, spiraling out
- Counterclockwise, spiraling in
- Straight out from the center in each direction
- Clockwise, spiraling in
Read this first
Use this
The four front symbols in a legend.
How is a cold front drawn on a weather map, by Noah's reading (NOAA)?
- A red line with half-moons
- A purple line with both symbols
- A blue line with triangles pointing the way it moves
- Alternating red and blue segments
How is a warm front drawn, by Pia's reading (NOAA)?
- A purple line
- A red line with half-moons pointing the way it moves
- A blue line with triangles
- A dashed brown line
What is a cold front, by Ren's reading (NOAA)?
- A line of equal pressure
- A front that is not moving
- The leading edge of cold air pushing out warmer air
- The leading edge of warm air replacing cold air at the ground
On a station model, what does one long barb on the wind line stand for, by Tala's reading (NOAA)?
- 50 knots
- 10 knots
- 5 knots
- 1 knot
A wind line has one long barb and one short barb. What is the wind speed, by Zee's math (NOAA)?
Use the picture in question 8.
- 6 knots
- 11 knots
- 15 knots
- 20 knots
NOAA: standard sea-level pressure is 1013.25 mb (29.92 inches of mercury). What is a reading of 1,030 mb, by Esme's reading?
- Exactly standard
- Lower than standard, as in a deep low
- Higher than standard, as in a high
- Impossible on Earth