CTO Weather Observation & Reporting 3

Question 1

An ATIS broadcast indicates 'Runway Visual Range 2400 feet.' What is the primary source of this RVR value?

Accepted Answer

Transmissometer or forward scatter sensor at runway touch-down zone

Answer

RVR is measured by transmissometers or forward scatter sensors positioned at the runway touchdown zone, mid-field, and rollout areas.

Question 2

When are controllers required to issue a Low-Level Wind Shear Alert System (LLWAS) alert to pilots?

Accepted Answer

Whenever the system detects a wind shear alert of 15 knots or greater

Answer

FAA orders require controllers to alert pilots to LLWAS wind shear alerts of 15 knots or greater microburst alerts.

Question 3

What information does the 'PRESRR' remark in a METAR convey?

Accepted Answer

Pressure rising rapidly

Answer

PRESRR indicates the altimeter setting is rising rapidly, typically by 0.06 inches Hg or more in less than an hour.

Question 4

A SPECI is issued when visibility drops below which threshold while previously above it?

Accepted Answer

3 statute miles

Answer

A SPECI special observation is required when visibility falls below or recovers to 3 statute miles.

Question 5

What does the coded remark 'TS B25' in a METAR indicate?

Accepted Answer

Thunderstorm began at 25 minutes past the hour

Answer

In METAR remarks, 'TS B' followed by minutes indicates when the thunderstorm began during the observation hour.

(CTO) Air Traffic Control Tower Operator Certification Practice Test