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Flashcards in Met Deck (28):
1

ATIS

Released every time significant change in weather
Cloud in AGL
Only forecast where wind is magnetic

2

ARFOR

Area Forecast
Only forecast where cloud is AMSL
Released at 0600 and 1200 approx local time
ADFOR regions found AIP Vol 1 GEN 3.5

3

TAF

Terminal Area Forecast
Valid between time stated on TAF
Covers 8km radius from ARP

4

TEMPO

Valid for no longer than an hour at a time and cumulatively no longer than half the period stated

5

METAR

Released hourly, on the hour
Covers 8km radius from ARP

6

TREND

Aerodrome forecast
Valid for 2hrs at end of METAR or SPECI stating any significant changes
While valid it supersedes TAF

7

AUTO METAR

Released every 1/2 hour, 24 hrs a day, by auto weather station

8

SPECI

Released outside normal time period of METAR when there is significant change in weather that lasts > 10 mins

9

// = ?

Unable to detect weather

10

///

Cloud detected, unsure if CB or TCU

11

////

Vis not reported

12

/////////

Cloud not reported

13

NCD

No cloud detected
TAF and METAR use SKC

14

NDV

No directional variation can be reported

15

PLWR

Possibly lower

16

VC

In the vicinity 8-16km from ARP

17

Southern Hemisphere winds

Altitude increases =
Altitude decreases =

Alt. Increase = Wind backs and strengthens
Alt. Decrease = Wind beers and weakens

Veer = moves clockwise eg. From 270 to 290

18

Environmental lapse rate

1.98*C per 1000ft

19

Dry Adiabatic lapse rate

3*C per 1000ft

20

Saturated adiabatic lapse rate

1.5* per 1000ft

21

ELR > DALR and SALR =

Unstable atmosphere

22

ELR < DALR and SALR =

Stable atmosphere

23

DALR > ELR > SALR =

Conditionally stable atmosphere

24

Characteristics of stable air

Cloud - stratiform
Precipitation - Light to moderate continuous
Vis - Poor
Turbulence - Light to moderate

25

Characteristics of unstable air

Cloud - Cumuliform
Precipitation - Intermittent, showery, moderate to heavy
Vis - Good
Turbulence - Moderate to severe

26

HZ vis =

< 5000m

27

BR vis =

1000 - 5000m

28

FG vis =

< 1000m