Weather Theory

Question 1

Which are the turbulence categories?

Answer 1

Question 2

Which is the validity period of the Significant Weather Chart?

Answer 2

Question 3

Describe the following figure from the High Level Significant Weather Prognostic Chart:

Answer 3

Question 4

Describe the following figure from the High Level Significant Weather Prognostic Chart:

Answer 4

Question 5

Describe the following figure from the High Level Significant Weather Prognostic Chart:

Answer 5

Question 6

Name at least 3 element contained in the Significant Weather Prognostic Chart:

Answer 6

1. Thunderstorms and cumulonimbus clouds
2. Moderate or severe turbulence
3. Moderate or severe icing
4. Jet streams
5. Tropopause heights
6. Tropical cyclones
7. Severe squall lines
8. Volcanic eruption sites
9. Widespread sandstorm and dust storms

Question 7

Describe the following figure from the Significant Weather Prognostic Chart:

Answer 7

Jet stream at FL 350 with winds of 130 knots, at FL360 winds of 110 knots, at FL 370 winds of 90 knots. Lowest tropopause at FL 270. Isolated embedded cumulonimbus at FL 320 with bases below FL100

Question 8

Interpret the following SIGMET:

CTN DUE TO VOLCANIC ACT TUNGURAHUA

VOLCANO 2000 RADIUS 55NM CENTERED

COORD 0301.5S 07313.0W

F) 15000FT AMSL G) 35000FT AMSL

Answer 8

Caution due to volcanic activity at volcano Tungurahua with a radius of 55NM centered in coordenades 0301.5S 07313.0W. From 15.000 ft above mean sea level to FL 350 above mean sea level.

Precaución a actividad volcánica del volcán tungurahua número 2000 a 55 NM de radio desde el centro del volcán ubicado en 0301.5S 07313.0W con base de 15000 amsl y topes de 35000 Amsl.

Question 9

What is the effective period of this TEMPO?

TEMPO 0116/0120 30020KT BKN025TCU

Answer 9

Tempo is effective between 16:00Z to 20:00Z of Day 1 .

Question 10

Define cloud coverage for FEW, SCT, BKN, OVC.

Answer 10

Question 11

Describe the term CAVOK

Answer 11

the contraction “CAVOK” (Ceiling and Visibility OK) may replace the visibility, weather, and sky condition groups if all of the following conditions are forecast: Visibility of 10 kilometer (6 statute miles) or more, no clouds below 1500 meters (5,000 feet) or below the highest minimum sector altitude (whichever is greater), no cumulonimbus, and no significant weather phenomena.

Question 12

Describe the following part of a SIGMT:

SEV MTW / FRQT HVYGR

Answer 12

Severe mountain wave SEV MTW/ Frecuentes con granizo fuerte FRQT HVYGR

Question 13

Which is the standard temperature at Sea Level (ISA)?

Answer 13

15 degrees celsius .

Question 14

How many degrees does the temperature decreases for every 1000 ft?

Answer 14

Temperature decreases 2 degrees celsius every 1.000 ft

Question 15

What would be ISA standard temperature at Bogota (SKBO 8400 ft)?

Answer 15

ISA standard temperature at Bogota is -1degrees celsius

Question 16

What would be ISA Deviation if temperature at Bogota (SKBO 8400 ft) is 18C?

Answer 16

It will be +19.

Question 17

Describe the following METAR

SCEL 011100 0000 KT 17L/350 VV0000 05/05 Q1010

Answer 17

Santiago de Chile, day 01 at 11:00Z.

Wind calm, RVR for rumway 17L 350mts, vertical visibility 0000, temperature 5 degrees dew point 5 degrees, altimeter setting 1010

Question 18

Describe the following METAR

SCEL 011100 0000 KT 17L/200U OVC001 05/05 Q1010

Answer 18

Santiago de Chile, day 1 at 11:00Z. Wind calm, RVR for runway 17L 200mts increasing, overcast at 100ft, temperature 5 degrees dew point 5 degrees, altimeter setting 1010.

Question 19

Describe the following METAR

SCEL 011100 0000 KT 17L/300D FZRA VV0000 01/M05 Q1020

Answer 19

Santiago de Chile, day 1 at 11:00Z. Wind calm, RVR for runway 17L 300mts and decreasing, freezing rain, vertical visibility zero, temperature 1 dregree, dew point minus 5 degrees, altimeter setting 1020.

Question 20

Name at least 2 factors that would indicate that enroute turbulence might be present.

Answer 20

Jetstream y cumulonimbus.

Question 21

What kind of clouds are associated to COLD FRONTS ?

Answer 21

• Cumulonimbus and cumulus congestus producing frequent showers
• Stratocumulus.
• Nimbostratus.