Aviation Forecast Warnings

Question 1

Strong Winds

Answer 1

Surface winds 24-34kts

Question 2

Gales

Answer 2

Surface winds of 34-43kts

Question 3

Gusts

Answer 3

In winds above 25kts, and gusts of 10kts greater than the mean forecast, but less that 43kts (above 43kts is a Gale warning)

Question 4

Squall

Answer 4

Sudden increase in wind speed of at least 16-22kts, lasting at least 1 minute and no Strong Wind / Gale warnings are in force

Question 5

CUMINS

Answer 5

Observed / Forecasted Cumulonimbus clouds within the forecast area.

Associated with:
• Turbulence
• Icing
• Gusts

Question 6

Icing

Answer 6

Only if severe and/or rain-ice

Question 7

Turbulence

Answer 7

Only if severe

Question 8

Thunderstorms

Answer 8

Whenever Thunderstorms are expected

Question 9

Low Cloud

Answer 9

3/8 or more below 1000ft height

Question 10

Fog / Dense Fog

Answer 10

Visibility of less than 1000m / 200m with relative humidity of above 95%

Question 11

Hill Fog / Dense Hill Fog

Answer 11

Same as sea fog, but forecasted over land

Question 12

Mist / Haze

Answer 12

Less than 2000m of visibility but more than 1000m

Question 13

Hail

Answer 13

Only if expecting more than 5mm in diameter

Question 14

Frost (Air/Ground)

Question 15

Icy Runway

Question 16

Snow

Answer 16

If expected within 6hrs

Warnings should include as much detail as possible, including:
• Time of Onset
• Intensity
• Duration
• Depth

Question 17

Freezing Precipitation

Question 18

Dust / Sand Storm

Question 19

Lee Waves

Question 20

Clean Air Turbulence

Answer 20

Only if severe

Question 21

Rotor Streaming

Question 22

Strong Upper Air Winds