102-4: TAFs

Question 1

Types of PIREPS

Answer 1

1. UA - Routine PIREP
2. UUA - Urgent PIREP

Question 2

TAF is issued how often in the US?

Answer 2

Every 6 hours

Question 3

WST -

Answer 3

Convective SIGMET
Every 2 hours
Numbering system - sequentially 01-99 for each day, appended with W, C or E

Question 4

WST are issued for … ?

Answer 4

Severe thunderstorms, tornados, embedded thunderstorms, line of thunderstorms, widespread (heavy precipitation)

Question 5

WS / Conditions

Answer 5

SIGMET
Severe icing not associated with thunderstorms
Severe or extreme turb or CAT not associated with thunderstorms
Dust storms, sand storms, VA resulting in IFR surface or in flight visibilities less than 3sm
Volcanic eruption
November - Yankee (Excluding Sierra and Tango)

Question 6

WA / Conditions

Answer 6

AIRMET
Moderate conditions:
Icing ZULU
turbulence TANGO
IFR & mountain obscuration SIERRA (C <1000’ and/or V <3SM affecting 50% of area)

Sustained surface winds of 30kts or greater
Non-convective LLWS below 2000’ AGL

Question 7

FB

Answer 7

Winds / Temps Aloft
FORECAST
4 x daily

Question 8

MIS

Answer 8

Meteorological Impact Statement
2-12 hours

Question 9

The MIS brief is …

Answer 9

A nontechnical discussion of meteorological events causing or expecting to cause the disruption of safe flow of air traffic.

What causes the disruption, area, altitudes, and movement.

Question 10

MIS significant weather includes …

Answer 10

Surface winds/gusts 30 knots or greater
Low level wind shear within 2000’ of surface
Volcanic ash, dust or sandstorm

Question 11

CWA

Answer 11

Center Weather Advisory
2 hours (issued and forecasted)

• aviation warning used by aircrews to anticipate and avoid adverse wx conditions.

Question 12

CWA is issued when any of the following conditions occur …

Answer 12

1. WST criteria
2. Icing - Mod or greater
3. Turb - mod or greater
4. Heavy and extreme precip
5. LLWS
6. Freezing Precip
7. When weather grows outside boundary or needs updated in general that isn’t already covered.

Question 13

Routine Issuance Criteria (WST)

Answer 13

1. Lines of thunderstorms >_ 60nm long w/ TSMS affecting >_ 40% of its length
2. An area of active TSMS affect at least 3000 sq. Miles covering at least 40% of the area
3. Embedded or severe TSMS expected to occur for more than 30 mins during the valid period regardless of size of the area.

Question 14

Special Issuance Criteria (WST)

Answer 14

1. Tornado, hail >_ 3/4 in at surface, wing gusts >_50kts at surface
2. Indications of rapidly changing conditions if, in the forecasters judgement, they are not sufficiently described in existing WST
3. Special issuance is not required for a valid WST

Question 15

Any WST implies….

Answer 15

Severe or greater turbulence, severe icing, and LLWS

Question 16

Sigmet Valid Times

Airmet valid times

Answer 16

Max forecast period - 4 hrs

Max forecast period - 6 hrs