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Weather > Present Weather > Flashcards

Present Weather Flashcards

1
Q

What does TT mean on the Station Model

A

Air Temperature

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2
Q

What does TdTd mean

A

Dew Point Temperature

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3
Q

What does WW mean

A

Present Weather symbol

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4
Q

What does DD mean

A

Wind Direction (10s of degrees from where wind is blowing)

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5
Q

What does FF mean

A

Wind speed (long feathers 10 knots, short feathers 5 knots)

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6
Q

What does PPP mean

A

Sea level atmospheric pressure

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7
Q

What does a mean

A

Slope of pressure tendency (last three hours)

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8
Q

What does pp mean

A

Magnitude of pressure tendency

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9
Q

What are the present weather codes 20 - 26 used to represent

A

Report precipitation, fog (ice fog) or thunderstorms at the station during the preceding hour but not at the time of precipitation

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10
Q

What do the the 40s and 50s mostly represent as ww

A

Precipitation and drizzle

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11
Q

What do the 60s and 70s mostly represent as ww

A

Rain snow and Ice type weather

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12
Q

What do the 80s and 90s mostly represent as ww

A

Rain shower, snow showers, thunderstorms and tornados

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13
Q

What is the present weather sensor (PWS)

A

A component of an automatic weather station that detects the presence of hydrometeors and determines their type (rain, snow, drizzle etc) and intensity.

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14
Q

What is the tipping bucket raingauge

A

The most common instrument for measuring precipitation, in situ, at the surface and cheap. Logs each tip of the bucket (commonly 0.2mm in size but can be larger in the tropics).

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15
Q

What classifies slight rain

A

<0.5mm/hr

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16
Q

What classifies moderate rain

A

0.5-4mm/hr

17
Q

What classifies heavy rain

A

> 4mm/hr

18
Q

What is the difference between a rain shower and just raining

A

showers are of short duration and fall from convection clouds (cumulus/ cumulonimbus)

19
Q

What does drizzle mean

A

The Diameter is greater than 5mm

20
Q

What is continuous precipitation

A

Falling for an hour or more

21
Q

What is intermittent precipitation

A

Falling for less than an hour

22
Q

What is fog

A

Visibility < 1000m and relative humidity 95%

23
Q

What is mist

A

Visibility 1-10km and relative humidity >95%

24
Q

What is haze

A

Visibility <10km and relative humidity 95%. There can b special cases though

25
Q

What is drifting snow

A

Above eye level

26
Q

What is blowing snow

A

Below eye level

27
Q

What is dew point temperature

A

The temp to which an air parcel must be cooled, at constant temperature, to become saturated with water vapour

28
Q

What is rime

A

A white ice that forms when the eater droplets in fog freeze to the outer surface of objects

Weather (8 decks)

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