Weather

Question 1

What happens to the stability of the air as lapse rate increases?

Answer 1

Stability decrease

Question 2

Cold front occlusion is…

Answer 2

Cold air replacing warmer air

Question 3

What visible signs indicate extreme turbulence in thunderstorms?

Answer 3

Cumulonimbus clouds, very frequent lightning and roll clouds

Question 4

The most destructive winds, heavy hail, and tornadoes are generally associated with

Answer 4

squall lines

Question 5

Flying over a turbulent mountain range, downdrafts caused by mountain waves will be found

Answer 5

on the crest and downwind side of the mountain range for hundred of miles

Question 6

Temperature of a rising parcel of air decrease by about…

Answer 6

2.5 C / 1000 ft

Question 7

Cumuliform Clouds

Answer 7

form in unstable air. The greater the convective lift, the taller the clouds and more severe the turbulence. Can extend 60,000 ft. Associated with lightning, thunderstorms, hail, severe turbulence.

Question 8

Nimbus Clouds

Answer 8

Any cloud that bring steady precipitation
latin for rain

Question 9

Cirriform Clouds

Answer 9

Thin, wispy, fibrous filaments. Form at high alt. 20,000 ft or greater

Question 10

Stratiform Clouds

Answer 10

Sheet-like layers form in stable air

Question 11

Changes in terrain elevation that force air aloft…

Answer 11

orographic lifting

Question 12

Unstable air characteristics

Answer 12

-moderate to severe turbulence
-showery precipitation
-Cumulus (vertical) clouds
-good visibility

Question 13

Stable air characteristics

Answer 13

-little to no turbulence
-contiguous precipitation
-stratiform (layered ) clouds
-poor visibility

Question 14

The US high-level significant weather prog. chart forecasts weather for what altitudes?

Answer 14

25,000 - 63,000

Question 15

The presence of ice pellets at the surface is evidence that there is…

Answer 15

a temperature inversion with freezing rain at higher alt.

Question 16

What conditions are associated with a cold front?

Answer 16

As the cold front passes towering cumulus or cumulonimbus clouds tower. Depending on intensity, heavy rain, lightning, thunder and or hail. Visibility is poor, winds gusty, dew point drops.

Question 17

What conditions are associated with an occluded front?

Answer 17

An occluded front is when a fast moving cold front catches a slow moving warm front. As the occluded front approaches warm front weather prevails but is immediately followed by cold front weather. Embedded t-storms, rain fog are associated with this front.

Question 18

The most hazardous conditions for icing are a result of what weather conditions?

Answer 18

Freezing Rain
(formed from SLD {Supercooled Large Drops})

Question 19

What are some characteristics of a high pressure system?

Answer 19

High pressure systems are generally areas of dry, descending air. Favorable weather is typically associated with high pressure systems.

Question 20

Name and describe 3 principle thunderstorms types.

Answer 20

Single cell thunderstorms- Consists of 1 cell. Rare and easily circumnavigated.
Multicell cluster t-storms- Consists of a cluster of cells at various stages. Lifespan of several hours.
Supercell t-storms- Often dangerous convective storm that consists of a single quasi-steady rotating updraft that persists. Updraft speeds of 9000 ft/min (100 knots). Produce severe weather.

Question 21

What 3 conditions are needed for thunderstorms to develop.

Answer 21

Water vapor, lifting action, unstable air.