Chapter 5
Vapor Pressure
Relative Humidity
Dew Point
Weather Trivia
100
Under what conditions do Dew/Frost form?
Dew: Saturation above 32F
Frost: Saturation below 32F
100
Adding water vapor to an air parcel does what to the water vapor pressure?
Increases.
100
Relative Humidity gives what in relation to air?
% of saturation
100
What is Dew Point?
Temperature at which air becomes saturated.
RH=100%
100
A "Tornado Warning" means what?
A tornado has been confirmed by radar or observed on the ground.
200
What is the process that occurs when frost forms?
Deposition (gas to solid)
200
What is the typical partial pressure due to water vapor in the atmosphere?
<4% (<40mb)
200
Is relative humidity an indication of human comfort?
No.
200
Does a high dew point or low dew point have a high water vapor amount?
Warm.
200
How wide was the largest tornado ever recorded?
Hint: El Reno, OK 2013
2.6 miles wide
300
What type of fog occurs on clear, calm nights typically in low lying areas?
Radiation fog
300
Saturation vapor pressure should always be greater, the same, or lower than vapor pressure.
Greater.
300
Name 2 ways to change relative humidity.
1. Add or subtract water vapor
2. Change the temperature of the environment
300
Dew point is a good measure of what in the air?
Actual water vapor content.
300
What is the range of Hurricane Season?
June 1st- November 30th.
400
What type of fog occurs when wind carries moist air over a cold surface?
Advection fog.
400
Which has a higher saturation vapor pressure, cold air or warm air?
Warm Air
400
What time of day has the highest/lowest relative humidity and why?
Highest: During the early morning hours (when temperatures are coldest)
Lowest: During the afternoon (when temperatures are warmest)
Low temp=low saturation vapor pressure
400
What occurs when temperature and dew point are equal?
The air is 100% saturated and condenses (clouds, fog)
400
How many named systems formed during the 2020 Hurricane Season?
30.
500
The 5 Prefixes/Suffixes of clouds.
Cirro (high)
Alto (middle)
Strato (low or flat)
Cumulo (vertical development)
Nimbo (precipitating)
500
What is the partial pressure due to the maximum amount of water vapor that can exist?
Saturation Vapor Pressure
500
What is the equation for relative humidity?
RH= Amount of water vapor/water vapor capacity x 100
(actual vapor pressure/saturation vapor pressure)
500
Is the dew point constant regardless of temperature change?
Yes.
500
Which country has the most occurring tornadoes annually?
United States (1,200)