Name_____________________________________________________________________
Practice- RH, Dewpoint, Station Models
All answers for multiple choice go to the side. Write answers for constructed response under the question.
1.When the dry-bulb temperature is 14°C and the
wet-bulb temperature is 8°C, the relative humidity is
(1) 6%
(3) 25%
(2) 22%
(4) 41%
2.Which weather station model indicates the highest relative
humidity?
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3.According to the Earth Science Reference Tables, what is the approximate dewpoint temperature if the dry-bulb temperature is 17ºC
and the wet-bulb temperature is 11ºC?
(1) 5ºC
(3) 11ºC
(2) 8ºC
(4) 15ºC
4.What is the approximate dewpoint temperature if the dry-bulb temperature is 26ºC and the wet-bulb temperature is 21ºC?
(1) 5ºC
(3) 18ºC
(2) 12ºC
(4) 23ºC
5.A weather station records a barometric pressure of 1013.2 millibars. Which diagram below would best represent this weather station
on a weather map?
6.The two thermometers below show the dry-bulb and wet bulb temperatures of the air. According to the dewpoint temperature chart in
the Earth Science Reference Tables, what is the approximate dewpoint temperature of the air?
A) 6 C
B) 11 C
C) 4 C
D) -25 C
7.The air temperature and the wet-bulb temperature were measured and both were found to be 18 C. Two hours later, measurements
were taken again and the air temperature was 20 C, while the wet-bulb temperature remained 18 C. The relative humidity of the air
during those two hours
A) decreased
B) increased
C) remained the same
Base your answers to questions 8 through 10 on the weather map below. The map shows isobars and seven weather station models.
Four of the weather stations are identified by letters A, B, C, and D.
8.Which New York State weather station had clear skies?
(1) Albany
(2) New York City
(3) Buffalo
(4) Syracuse
9. Which weather station had the highest relative humidity?
(1) A
(2) C
(3) B
(4) D
10. What was the probable air pressure, in millibars, at station D?
(1) 1015.0 mb
(2) 1021.0 mb
(3) 1017.0 mb
(4) 1036.0 mb
Base your answers to questions 11 through 13 on the Earth Science Reference Tables and the diagram below which represents a
surface weather map of a portion of the United States. The map shows a low-pressure system with frontal lines and five weather
stations A through E. Note that part of the weather data is missing from each station. [All temperatures are in ºF.]
11. Which weather station has a relative humidity of 100%?
(1) A
(2) C
(3) B
(4) D
12. The weather at station C would most likely be
(1) partly cloudy, windy, and very cold
(3) overcast, humid, and cool
13. The wind direction at station A is
(1) northwest
(2) southwest
(2) partly cloudy and warm
(4) very dry and extremely hot
(3) northeast
(4) southeast
Base your answers to questions 14 through 15 on the weather map below, which shows a low-pressure system over the eastern United
States. Letters A through D represent weather stations.
14. Which station model correctly represents the barometric pressure at station A?
15. Which weather instrument was used to measure wind speed at station D?
(1) barometer
(2) psychrometer
(3) thermometer
(4) anemometer
Base your answers to questions 16 through 17 on the information on the four station models shown below. The weather data were
collected at Niagara Falls, Syracuse, Utica, and New York City at the same time.
16. What was the air pressure in Syracuse? _______ mb
17. Explain how the weather conditions shown on the station models suggest that Utica had the greatest chance of precipitation.
18. New York City was experiencing a wind blowing from the south at 10 knots with hazy conditions limiting visibility to .34 of a mile.
On the station model for New York City below, place, in the proper location and format, the information below.
• wind direction
• wind speed
• present weather
• visibility