Weather Variables

A psychrometer is used to determine which weather variables?

• Wind speed and wind direction
• Percentage of cloud cover and cloud height
• Air pressure and air temperatureOption 3 (optional)
• Relative humidity and dew point

In the Northern Hemisphere, surface winds around the center of a hurricane move

• Clockwise and inward
• Clockwise and outward
• Counterclockwise and inward
• Counterclockwise and outward

If air has a dry-bulb temperature of 2°C and a wet-bulb temperature of –2°C, what is the relative humidity?

• 11%
• 20%
• 36%
• 67%

The weather station model below shows some of the weather data for a certain location. What is the wind speed shown on the station model and which instrument is used to measure the wind speed?

• 15 knots, measured by a wind vane
• 15 knots, measured by an anemometer
• 25 knots, measured by a wind vane
• 25 knots, measured by an anemometer

Which station model shows an air temperature of 75°F and a barometric pressure of 996.3 mb?

• 1
• 2
• 3
• 4

Which map best represents the surface wind pattern around Northern Hemisphere high-pressure and low-pressure centers?

• 1
• 2
• 3
• 4

What is the dew point when the dry-bulb temperature is 12°C and the wet-bulb temperature is 7°C?

• 1°C
• –5°C
• 28°C
• 48°C

The station model below shows some weather conditions at a location on Earth’s surface. What weather conditions are occurring at this location?

• Freezing rain
• Fog
• Snow
• Rain

Which weather instrument is used to determine wind direction?

• 1
• 2
• 3
• 4

The map below indicates an air-pressure field over North America. Isobar values are recorded in millibars. At which city was the greatest wind speed occurring?

• Boise
• Denver
• Kansas City
• Austin