PRECIPITATION Flashcards
(40 cards)
General term for all forms of moisture originating from clouds and falling to the ground
Precipitation
Precipitation happens when water falls down to the earth surface. This water might be ___ & ____
Liquid or Solid State
consists of waterdrops under 0.02-in. diameter
Drizzle
consists of drop usually greater than 0.02-in. diameter
Rain
is the ice coating formed when drizzle or rain freezes
Glaze
is frozen raindrops cool to the ice stage while falling through air at subfreezing temperatures.
Leet
precipitation in the form of Ice crystals resultung from sublimation
Snow
is made up of a number of ice crystals fused together.
Snowflake
is precipitation in the form of balls or lumps of ice over 0.2-in. diameter formed by alternative freezing and melting
Hail
Types of Precipitation
Convective precipitation
Cyclonic precipitation
Orographic precipitation
Forms of precipitation
Snow
Snowflake
Hail
is the interfere between two distinct air masses.
Front
is caused by natural rising of warmer, lighter air in colder, denser surroundings.
Convective precipitation
results from the lifting of air converging into a low-pressure area, or cyclone.
Cyclonic precipitation
results frok mechanical lifting over mountain barriers.
Orographic precipitation
is a large low pressure region with circular wind motion
Cyclone
Two types of Cyclone
Tropical cyclones
Extra tropical cyclones
are regions of high pressure, usually of harge areal extent. It cause clockwise wind circulation in the northerm hemisphere.
Anticyclones
is the amount of precipitation, the form of rain (water from clouds), that descends onto the surface of Earth
Rainfall
is falling snowflakes or snow crystals or also the accumulation of snow during a specified period of time.
Snowfall
is the simplest avareging method but can only be relied on small, flat areas.
Arithmetic mean method
is a graphical technique that considers the weights of each rain gages based on the relatice measurements of their respective area coverage.
Thiessen polygon
is also a graphical technique that involves drawing isohyets or contours that are equal to the respective rainfall gage over an area based on point measurements.
Isohyetal method
is used when the normal annual precipitation at each of the index stations is less or more than 10 percent of that for the station with the missing record.
Normal ration method