Lesson 39

Question 1

Controllers shall advise pilots of hazardous weather that may impacts operations within ____ nm of their sector

Answer 1

150

Question 2

Solicit PIREPS when requested or when one of the following conditions exist/forecasted

Answer 2

• ceilings at or below 5000 ft
• visibility at or less than 5 sm
• thunderstorms
• turbulence moderate+
• icing light +
• wind shear
• volcanic ash clouds

Question 3

urgent PIREPS

Answer 3

• tornadoes, funnel clouds, waterspouts
• severe, extreme turbulence
• severe icing
• hail
• LLWS (within 2000 ft of surface)
• volcanic eruptions and volcanic ash clouds

Question 4

must record with PIREPS

Answer 4

• time
• a/c position
• a/c type
• altitude
• icing type/intensity and air temp

Question 5

airmet

Answer 5

description of the occurrence or expected occurrence of specified en route weather phenomena which may affect the safety of a/c operations
- dissemination to all pilots, especially sensitive to pilots without instrument ratings

Question 6

sigmet

Answer 6

notice of potentially hazardous en route phenomena such as thunderstorms, hail, turbulence, icing, sand and dust storms, tropical cyclones and volcanic ash
- dissemination to all pilots

Question 7

convective sigmet

Answer 7

thunderstorms in the lower 48 states

Question 8

CWA center weather advisory

Answer 8

unscheduled inflight, flow control, air traffic and air crew advisory
- short term forecast for conditions beginning within the next two hours

Question 9

who issues cwas?

Answer 9

National Weather Service forecasters at Center Weather Service Units (CWSU), located in all en route centers

Question 10

HIWAS

Answer 10

hazardous inflight weather advisory service

- broadcast HIWAS alert on all frequencies except emergency frequencies