Term
| Why is it so important that weather personnel correctly identify orographically produced clouds in the observation? |
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Definition
Because they’re important to flight operations due to the association of mountain-wave turbulence with
these types of clouds. |
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Term
Name and subtype number for the following orographic cloud:
This middle-level orographic cloud type is observed in patches at one or more levels; the
elements are continually changing in appearance but generally remain stationary in spite of
high wind speeds. |
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Definition
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Term
Name and subtype number for the following orographic cloud: This orographic cloud type hugs the top of a mountain and gives the appearance of a
waterfall. |
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Definition
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Term
Name and subtype number for the following orographic cloud: This orographic cloud type is found on the leeward side of a mountain range and has vertical
development. |
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Definition
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Term
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Definition
Clouds or obscuring phenomena that have bases at the same approximate level. The layer may appear as
continuous cover or as detached elements. Also, both continuous and detached elements may combine to
form a layer. |
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Term
Using the Reportable Contraction, Meaning, and Summation Amount of Layer table determine
the amount of sky coverage of a layer of CS that’s progressively invading the sky and whose
leading edge is 89º: |
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Definition
| Four-eighths of sky cover. |
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Term
| If a layer was exactly between two reportable height values, which value would you report? |
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Definition
| The lower of the two values. |
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Term
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Definition
| The lowest broken or overcast layer aloft or the vertical visibility in a surface-based obscuring phenomena. |
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Term
| What are the two preferred methods used to obtain a layer height? |
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Definition
| A ceilometer operating within its operational range and the known heights of unobscured portion of abrupt, isolated objects within 11/2 nautical miles of the runway. |
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Term
| List at least five alternative methods used to obtain a layer height: |
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Definition
Your answer should include any five of the following methods:
(1) Heights reported by a pilot.
(2) Based on the ascension rate of a ceiling balloon.
(3) Convective cloud height table.
(4) Based on the height of natural landmarks more than 11/2 miles from the airfield.
(5) Your own observational experience.
(6) Ceilometer indications that equal or exceed 10 times the baseline.
(7) Based on the size of the cloud elements.
(8) Reflection of city lights off of cloud bases. |
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Term
| What’s the meaning of the term prevailing visibility? |
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Definition
The greatest distance known objects can be seen and identified throughout half or more of the horizon
circle surrounding the station. |
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Term
When reporting sector visibility, how many compass points normally are used to identify sector
direction? What are they? |
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Definition
| Eight. N, NE, E, SE, S, SW, W, NW. |
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Term
| What are the two requirements which must be met to report sector visibility? |
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Definition
(1) When sector visibility differs from prevailing visibility.
(2) When sector visibility is less than 3 miles. |
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Term
| When reporting sector visibility and more than one sector needs to be reported, how are the sectors listed? |
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Definition
| In a clockwise direction beginning with the northernmost sector. |
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Term
Can you report the sector visibility if the sector visibility differs from prevailing visibility (but is
more than 3 miles)? Explain your answer. |
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Definition
| Yes. If you consider it operationally significant. |
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Term
| What’s the RVR for the following report: R09/1600? |
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Definition
| On runway 09, the RVR is 1600 meters. |
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Term
| Can you tell the exact RVR from the following report—R15/P6000FT? Explain. |
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Definition
No, it’s greater than 6000 feet but how much greater isn’t known. The maximum reportable value has been
exceeded. |
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Term
| What RVR is reported if the RVR is required to be reported but the equipment is inoperative? |
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Definition
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