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Published byClaude Sullivan Modified about 1 year ago

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Tephigram exercise 1 First we plot the temperature

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Tephigram exercise 1 First we plot the temperature

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Tephigram exercise 1 The red dots are the humidity

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Tephigram exercise 1 Depth of the PBL?

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Tephigram exercise 1 Depth of the PBL Approx 100 hPa

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Tephigram exercise 1 Q: RH at 1000 hPa?

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

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Depth of the Is the PBL well mixed? Potential temperature at 800 hPa? (two ways)

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

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

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

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

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

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

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

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

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

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A B C D E F

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Tephigram V: Convective Instability

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Convective Instability

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Tephigram V: Convective Instability

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1.Stable 2.-8C and -14C

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Gate sounding

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