Dew Point and Relative Humidity for Weather Analysis
Explore the concepts of dew point and relative humidity, their significance in weather forecasting, and how they are measured using tools like a Sling Psychrometer. Learn about Henry Ossian Flipper, the first African American to graduate from West Point. Discover how to find dew point using dry and wet bulb readings.
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Presentation Transcript
Dew Point and Relative Humidity 8 March 2019
Do Now 1. What is weather? 2. What is wind? 3. What is temperature? Short term condition of atmosphere? Moving Air Indirect measure of energy
Who was Henry Ossian Flipper? Henry Ossian Flipper (March 21, 1856 April 26, 1940) was an American soldier, former slave and in 1877, the first African American to graduate from the United States Military Academy at West Point, earning a commission as a second lieutenant in the US Army.
Dew Point Dewpoint is the temperature at which the air is saturated Dew point can only be changed by changing the amount of moisture in the air The closer the air temperature and the Dewpoint are together the more likely precipitation is likely to occur Dewpoint temperature is measured in degrees Celsius
Fair 15 F -9 C Humidity 56% Wind Speed Vrbl 6 mph 30.36 in (1028.2 mb) Barometer Dewpoint 2 F (-17 C) Visibility 10.00 mi Wind Chill 6 F (-14 C) Last update 8 Feb 6:51 am EST
Relative Humidity Relative Humidity is the amount of moisture in the air compared to what the air can hold It is given as a percentage It will vary as the temperature changes
Relative Humidity and Dewpoint are found with a Sling Psychrometer
To use the chart: Subtract the ______bulb temperature from the ______bulb to find the ___________________ (wet bulb depression) On the dewpoint temperature chart follow the horizontal row across from the _________ temperature until it meets the vertical column coming down from the _____________ At the intersection read the ______________ temperature
Find the dewpoint given the dry and wet bulb readings 20oC 17oC 15oC 5oC 3oC 0oC
If there is no number in the Relative Humidity chart it is zero. If there is no number in the Dewpoint Chart the answer is None If you are finished with the worksheet on the bottom of page two, under the cartoon, write the dry bulb temperature and the wet bulb temperature for the room and find the dewpoint for the room
