Pressure systems, fronts and weather maps

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   What does an isobar on a weather map connect, by Ari's reading (NOAA)?

   • Points that share the same temperature
   • The path of a front
   • Points of equal air pressure
   • Points with equal rain
2. 2.

   Where isobars are close together, what is the wind like, by Bo's reading (NOAA)?

   • Stronger, since pressure changes quickly
   • Weaker, since the gradient is small
   • Calm, since the lines crowd out the moving air
   • Blowing straight up
4. 3.

   Air is pushed from which pressure toward which, by Kira's reading (NOAA)?

   • From high pressure toward low pressure
   • From cold places toward hot ones
   • Straight along each isobar, with no push
   • From low pressure toward high pressure
5. 4.

   What weather usually comes with high pressure, by Jun's reading (NOAA)?

   Use the picture in question 3.

   • 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
6. 5.

   Why do lows often bring clouds and rain, by Luz's reading (NOAA)?

   Use the picture in question 3.

   • Pressure pushes the rain down
   • Converging air rises, cools and condenses
   • Air spreads out from the center
   • Sinking air warms and dries
7. 6.

   In the Northern Hemisphere, which way does wind circle a low, by Milo's reading (NOAA)?

   • Counterclockwise, spiraling in
   • Straight out from the center in each direction
   • Clockwise, spiraling in
   • Clockwise, spiraling out

8. Read this first

   Use this

   The four front symbols in a legend.

9. 7.

   How is a cold front drawn on a weather map, by Noah's reading (NOAA)?

   • Alternating red and blue segments
   • A red line with half-moons
   • A blue line with triangles pointing the way it moves
   • A purple line with both symbols
10. 8.

    How is a warm front drawn, by Pia's reading (NOAA)?

    • A blue line with triangles
    • A dashed brown line
    • A red line with half-moons pointing the way it moves
    • A purple line
11. 9.

    A wind line has one long barb and one short barb. What is the wind speed, by Zee's math (NOAA)?

    • 6 knots
    • 15 knots
    • 20 knots
    • 11 knots
12. 10.

    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?

    • Higher than standard, as in a high
    • Impossible on Earth
    • Lower than standard, as in a deep low
    • Exactly standard