101-5 Moisture, Clouds & Precipitation Flashcards

1
Q

Relative Humidity

A

The actual water vapor in the air to that of which it could possibly present

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2
Q

What determines how much water vapor can be held in the air?

A

Temperature & Relative humidity

Warmer temps can hold more water vapor

If relative humidity = 100% saturated air
If relative humidity <100% unsaturated air

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3
Q

Dew Point

A

Temperature in which air must be cooled to become saturated

*as H20 is added to the air, the DP will rise

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4
Q

Temp/Dew Point Spread (SPREAD)

A

Temp - dew point (T-DP)

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5
Q

Conditions needed for FOG

A
  1. T-DP is < or = to 3 degrees C
  2. Decreasing T-DP spread
  3. Light winds
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6
Q

Condensation nuclei

A

Microscopic particles which can become condensation surfaces

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7
Q

Supercooled Water

A

Freezing Rain/Drizzle
Liquid that is below 0 degrees C
0 to -10 degrees C = stratiform clouds
0 to -15 degrees C = cumuliform clouds

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8
Q

Frost may form when the …

A

… dew point is 0 degrees C or colder

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9
Q

3 types of precip

A
  1. Liquid = rain/drizzle
  2. Freezing = freezing rain (warmer air above)
  3. Frozen = ice pellets (indicates FZRA above), snow, hail
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10
Q

Cold air over a warm lake = ?

Warm air over a cold lake = ?

A

showers
fog

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