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 with equal rain
   • The path of a front
   • Points of equal air pressure
   • Points that share the same temperature
3. 2.

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

   • Fair weather, as sinking air warms and clouds evaporate
   • Thunderstorms each day
   • Snow, as air rises and cools
   • Clouds and steady rain, as air rises and cools over the area
4. 3.

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

   Use the picture in question 2.

   • Air spreads out from the center
   • Pressure pushes the rain down
   • Converging air rises, cools and condenses
   • Sinking air warms and dries
5. 4.

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

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

6. Read this first

   Use this

   The four front symbols in a legend.

7. 5.

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

   • A purple line with both symbols
   • A blue line with triangles pointing the way it moves
   • A red line with half-moons
   • Alternating red and blue segments
8. 6.

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

   • A blue line with triangles
   • A red line with half-moons pointing the way it moves
   • A purple line
   • A dashed brown line
9. 7.

   What is a cold front, by Ren's reading (NOAA)?

   • A front that is not moving
   • The leading edge of warm air replacing cold air at the ground
   • The leading edge of cold air pushing out warmer air
   • A line of equal pressure
11. 8.

    On a station model, what does one long barb on the wind line stand for, by Tala's reading (NOAA)?

    • 10 knots
    • 1 knot
    • 50 knots
    • 5 knots
12. 9.

    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.

    • 20 knots
    • 15 knots
    • 11 knots
    • 6 knots
13. 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?

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