101-5 Moisture, Clouds & Precipitation

Question 1

Relative Humidity

Answer 1

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

Question 2

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

Answer 2

Temperature & Relative humidity

Warmer temps can hold more water vapor

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

Question 3

Dew Point

Answer 3

Temperature in which air must be cooled to become saturated

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

Question 4

Temp/Dew Point Spread (SPREAD)

Answer 4

Temp - dew point (T-DP)

Question 5

Conditions needed for FOG

Answer 5

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

Question 6

Condensation nuclei

Answer 6

Microscopic particles which can become condensation surfaces

Question 7

Supercooled Water

Answer 7

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

Question 8

Frost may form when the …

Answer 8

… dew point is 0 degrees C or colder

Question 9

3 types of precip

Answer 9

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

Question 10

Cold air over a warm lake = ?

Warm air over a cold lake = ?

Answer 10

showers
fog