, WHAT IS THE RELATIVE HUMIDITY
OF A PARCEL AT THE SURFACE (ASSUME TO BE 1000MB UNLESS OTHERWISE
INDICATED)?
1. WHAT IS THE TEMPERATURE OF A PARCEL LIFTED DRY ADIABATICALLY
a) from 30°C @1000mb to 700mb? Tp=1°
b) from 15°C @1000mb to 600mb? Tp=-24.5°
c) from -10°C @900mb to 650mb? Tp=-34°
2.WHAT IS THE TEMPERATURE OF A PARCEL LIFTED WET ADIABATICALLY
a) from 30°C @1000mb to 700mb? Tp=19°
b) from 15°C @1000mb to 600mb? Tp=-7°
c) from -10°C @900mb to 650mb? Tp=-29°
3. WHAT IS THE TEMPERATURE OF A PARCEL STARTING FROM 32°C@1000
a) lifted dry adiabatically to 850 mb and wet adiabatically
to 400mb? Tp=-13.5°
b) lifted dry adiabatically to 650 mb and wet adiabatically
to 300mb? Tp=-46°
| Answers 1-3, graphically |
4. IF , WHAT IS THE RELATIVE HUMIDITY
OF A PARCEL AT THE SURFACE (ASSUME TO BE 1000MB UNLESS OTHERWISE
INDICATED)?
a) T= 24°C Td= 8°C w=7 ws=19.5 RH=36%
b) T= 5°C Td=-2°C w=3.4 ws=5.5
RH=62%
c) T=30°C Td=10°C p=850mb w=9.2 ws=34
RH=27%
5. WHAT IS THE POTENTIAL TEMPERATURE OF AIR
a)at 500 mb with a temperature of -11°C? =320°
b) at 850 mb with a temperature of 2°C ? =287°
c) Which is potentially warmer? T=8°C @ 500mb or
T=21°C @ 1000mb? Explain your answer. How would you evaluate
for question 5c?
The air at 500mb is potentially warmer than at 1000mb, that is, has a higher potential temperature. d/dZ > 0 because increases with height.
| Answers 4,5, graphically |
6. WHAT IS THE 1000-500 MB THICKNESS OF A LAYER WHOSE AVERAGE TEMPERATURE IS
a) 25°C ? Z=6.9km
b) 0°C ? Z=6.0km
c) What is the relationship between thickness and temperature?
The hypsometric equation, or thickness relation states:
the vertical distance between isobaric surfaces is directly proportional
to the average temperature of the layer.
7. FIND THE LCL IF THE SURFACE TEMPERATURE AND DEW POINT ARE
a) 25°C and 20°C, respectively. LCL=930mb
b) 18°C and -1°C, respectively. LCL=750mb
c) 25°C and 20°C, respectively @ 900mb. LCL=850mb
8. WHAT IS THE EQUIVALENT POTENTIAL TEMPERATURE OF 7a, 7b AND 7c FROM QUESTION #7 ABOVE?
a) e=347°
b) e=300°
c) e=355°
| Answers 6-8 graphically |
