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50 Cards in this Set
- Front
- Back
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Most comprehensive manual for U.S. Navy shiboard surface aviation weather observations
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NAVMETOCCOMINST 3144.1
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Freezing point of water on Kelvin temperature scale
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273.16 K
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standard time zone designation for east coast of United States
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-5
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day that marks beginning of daylight savings time in U.S.
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First Sunday of April
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day that marks end of daylight savings time in U.S.
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last Sunday in October
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Cumuliform clouds are generally associated with what type of air ?
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moist and unstable
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lift caused by air density differences between air masses along frontal zone
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frontal
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lift caused by friction between adjacent layers
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turbulent
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lift caused by features on Earth's surface, such as mountains
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orographic
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lift caused by heating near Earth's surface
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convective
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What etage does cumulus belong to ?
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low etage
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In the mid latitudes the top of the mid etage extends to what altitude?
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23,000 ft
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What is another name for waterspouts or tornados?
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tuba
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T/F
Moderately developed cumulus clouds may produce precipitation. |
True
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A dark, fuzzy area immediately below base of cumulus cloud
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virga
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In mid latitudes, cirrus blowoff from a CB anvil top will occur at maximum of how many feet?
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45,000 ft
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Low level wind shear is associated with what boundary ?
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outflow boundary
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How far can hail be found from CB cell ?
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up to 25 miles
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Most common form of precipitation produced by stratocumulus
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snow flurries
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What produces a corona ?
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Liquid droplets in a mid-etage cloud
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An orographic cloud that forms downwind of a mountain range and is cap shaped
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Forehnwall
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Standard abv. for cloud to ground lightning
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LTGCG
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What 3 things are used to determine cloud ceiling ?
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1. total sky cover
2. Layer coverage 3. summation sky coverage |
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The first broken or overcast layer is called what ?
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ceiling
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white,opaque, rounded or conical kernels of frozen water that occur as showers
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snow pellets
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type of precipitation that is formed exclusively in thunderstorms
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ice pellets
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____ precipitation falls from cumuliform clouds and changes more abruptly than intermittent precipitation
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showery
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greatest distance that objects may be seen and identified throughout more than half of the horizon circle
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prevailing visibility
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visibilty associated with how far pilot can see at the moment the aircraft lands
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runway visual range
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suspended liquid water droplets that reduce visibility from 1,000 m to 9,000m
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mist
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ambient air temperature
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dry bulb
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saturation point of air when temperature is below freezing
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frost point
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temperature that air must be cooled to reach saturation
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dew point
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Wind direction is normally reported and forecasted to what degree ?
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nearest 10 degree
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standard unit of measure for wind speed by U.S. forces
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knots
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gust
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rapid fluctuation in wind speed with variation between peaks and lulls
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sudden increase in wind speed by 16 knots or more and REMAINS 22 knots or more for at least 1 minute
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squall
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peak wind speed
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highest observed instateneous wind speed
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wind direction changes by 60 degrees or more
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variable wind
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change in wind direction by 45 degrees or more during a 15 minute period
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wind shift
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average height of only the highest 1/3 of the waves
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significant wave height
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average freezing point of seawater
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-1.9 C
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small ice cake
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piece of sea cake 1.5 m across
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any sizable area of seawater enclosed by ice
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polyna
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a break or crack in the ice
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fracture
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a melt hole in the ice
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thaw hole
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Where do most icebergs originate in the Northern Hemisphere ?
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Greenland
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Iceberg about the size of a truck is called what?
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growler
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ratio of water vapor the air holds to the amount it can possibly hold
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relative humitdity
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Three indicators that are used as a guide for precipitation intensity.
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1. rate of accumulation
2. visibility 3. spray appearance over hard surfaces |
