# Tephigram exercise 1 First we plot the temperature.

## Presentation on theme: "Tephigram exercise 1 First we plot the temperature."— Presentation transcript:

Tephigram exercise 1 First we plot the temperature

Tephigram exercise 1 First we plot the temperature

Tephigram exercise 1 The red dots are the humidity

Tephigram exercise 1 Depth of the PBL?

Tephigram exercise 1 Depth of the PBL Approx 100 hPa

Tephigram exercise 1 Q: RH at 1000 hPa?

Tephigram exercise 1 RH=rv/rs = 5 / 7.7 = 65%

Depth of the PBL=100hPa. RH@1000hPa=65% @900hPa=85%
Is the PBL well mixed? Potential temperature at 800 hPa? (two ways)

Potential temperature at 800 hPa?
291K – Two ways to read…

700? Potential temperature at 800 hPa? 291K – Two ways to read…

What is the condensation temperature and pressure of parcel at 1000 hPa?
910 hPa and 2.5oC Tephigram exercise 2

What is dew point temperature of parcel at 1000 hPa?
Approximately 4oC

Rainfall evaporated into parcel at 1000 hPa?
Becomes saturated at 7oC, called the “wet-bulb temperature” Mixing ratio at this point is 6.3 g kg-1

What is the equivalent potential temperature of parcel at 1000 hPa?
22.5oC – this is the same as the equivalent temperature.

What is the equivalent potential temperature of parcel at 900 hPa?
900 hPa = 23oC, 700hPa off the page, different tephigram bounds required It is increasing with height.

LCL is 910 hPa (same as condensation pressure). LFC undefined.
What are the LCL and LFC for parcel at 1000 hPa? Tephigram exercise 3 LCL is 910 hPa (same as condensation pressure). LFC undefined. Trigger temperature 17oC, convection unlikely, as requires strong heating.

What is dew point temperature of parcel at 1000 hPa?
Approximately 4oC

E F D C B A

Tephigram V: Convective Instability

Convective Instability

Tephigram V: Convective Instability

Tephigram V: Convective Instability

Tephigram V: Convective Instability
Stable -8C and -14C

Gate sounding