Transcript Meteo 003: Lab 4

Meteo 003: Lab 4
Due Friday, September 23rd
Chapter 4: 14ab, 15c
Chapter 5: 10abd, 18
Chapter 6: 2ab, 7ab, 9acd
Chapter 7: 9ab
4.14a,b
Isohyets: isopleths of rainfall
a)
-same guidelines as all isopleths
Hint: you’ll have to draw “circles” in places
b)
-prevailing winds are northeasterly
-draw an arrow representing wind direction
-air rises on windward side of a mountain
pg. 163
4.15c
pg. 164
Heat Index/Apparent Temperature: the temperature the air “feels like” to a
person when moisture is taken into account
c)
-temperature is in ᵒF
-vapor pressure is in mb
*note that the units do not work out, this is a simplified equation
-when given dew point, substitute vapor pressure for equilibrium (or
saturation, same thing) vapor pressure
Be sure to read the first paragraph!!
Apparent Temperature Example
 Find the apparent temperature for a day given that the
air temperature was 80ᵒF and the dew point was 70ᵒF.
 How do you find
vapor pressure?
5.10a,b,d
pg. 205
a)
-Which imagery is used to determine albedo?
-High albedo = reflecting more, low albedo = absorbing more
b)
-Which imagery reveals information about temperature?
-Refer to table on next slide
d)
-What is the relation between the amount of emitted radiation to cloud-top
temperature? Then relate cloud-top temperature to the height of the cloud
tops
Helpful Table
Type of Imagery
Visible
Infrared
Water Vapor
Color
Darker
Lighter
Darker
Lighter
Darker
Lighter
Interpretation
Clearer
Cloudier
Warmer
Colder
Drier
Moister
5.18
pg. 211
-Radar beams are sent out at an angle, and the earth is not flat!
-For the snow showers to not be seen by the radar, what must be true?
6.2a,b
pg. 243
Pressure Gradient Force: the force that directs air from higher toward lower
pressure.
*always points from high to low pressure
*perpendicular to isobars (gets from high to low pressure fastest this way)
-Think about when you’re pumping up a sports ball and air
comes out
a)
-Wind blows away from higher pressure and toward lower pressure
-Make sure to draw about a dozen arrows
b)
-Would the pressure gradient force be different in the Southern Hemisphere?
6.7a,b
pg. 248
-Surface pressures at different locations with differing elevation need to be
converted to sea-level pressure to be able to compare “apples to apples”
-Pressure decreases with height in the atmosphere
a)
-Use pressure decrease of 10 mb for every 100 m of elevation
Ex) What is the corrected to sea-level pressure of State College, PA if the
surface pressure was measured to be 965 mb and the elevation is 350 m?
-would the corrected pressure be greater or less than 965 mb?
b)
6.7 cntd…
-Pressure is lower at higher elevations
-That’s why the air is thinner and harder to breathe in places like Denver, CO
-How would a map of pressure look if left uncorrected to sea-level?
6.9a,c,d
pg. 249
*NO part b
a)
-Identify Highs and Lows by finding relative maxima and minima of closed isobar values
c)
-Wind barbs show the direction the wind is coming from (you may use arrows instead)
-Consider how wind flows around High and Low pressure systems
d)
-In general, the tighter (closer together) the isobars, the faster the wind speed
-This is due to a stronger pressure gradient force
7.9a,b
pg. 300
-A warmer column of air will have higher heights on a given pressure surface
when compared to a colder column of air
a)
-Determine which location is warmest, which is coldest?
-How would the temperature of each location affect the height of any given
pressure level?
b)
-Use the same concepts from part a but instead of different locations think of
different seasons
LAB #4 – DUE FRIDAY, SEPTEMBER 23rd
 Ann ([email protected]): 12-1 PM 6th floor Walker Weather Center (room 606)
 Dalton ([email protected]): 2-3 PM 6th floor Walker Weather Center
 Kerry ([email protected]): 3-4 PM 6th floor Walker Weather Center
 LAB #4 Assignment Summary
 Chapter 4: (14 a,b) (15 c)
 Chapter 5: (10 a,b,d) (18)
 Chapter 6: (2 a,b) (7 a,b) (9 a,c,d)
 Chapter 7: (9 a,b)
There will be a review session next
Tuesday night (time and place TBA)