### weather:

Precipitation
* All precipitation begins as ice crystals in the upper levels of the atmosphere
  - falls out of a cloud as snow
* All precipitation starts as ice or snow crystals at cloud level
  - out as ice or snow crystals at cloud-level
* Any precipitation falls the long distance through the clouds towards the Earth's surface.
* More precipitation falls as rain than snow
  - in winter, when the storm track is most active, than in summer
* Most precipitation becomes surface water
  - vapor
* Most precipitation causes excessive moisture
  - comes in the spring and summer
  - consists of ice particles
* Most precipitation consists of opaque ice particles
  - falls along the coastline and aridity increases as one moves away from the coast
* Most precipitation falls as rain but includes snow, sleet, drizzle, and hail
  - rain, and most rain falls on the oceans
  - snow in Antarctica
  - back into oceans or lakes
  - from clouds
* Most precipitation falls in autumn and winter
  - late summer and early autumn thunderstorms
  - the winter months, and little during the summer
  - on basins
  - to earth
  - has productivity
* Most precipitation is caused by a combination of different processes causing the air to rise
  - found around the cold front
  - produced by storms
* Most precipitation occurs as rainfall
  - snowfall
* Most precipitation occurs during grow seasons
  - summer, mainly as a result of convective storms
  - warm seasons
* Most precipitation occurs in summer
  - the winter, primarily as rain
  - time
  - passes through layers
* Most precipitation reaches earth
  - soil surfaces
  - takes place during the growing season
* Much precipitation falls at higher elevations during winter months in the form of snow.
* Some precipitation affects chemistry
  - height
  - soil chemistry
* Some precipitation causes exothermic heat
  - comes in winter
* Some precipitation contains dioxide
  - sulfur dioxide
* Some precipitation falls as snow
  - infiltrates the soil surface and becomes soil water or groundwater
* Some precipitation leads to primary productivity
  - salinity
  - occurs as snow
* Some precipitation occurs during summer months
* Some precipitation relates to primary productivity
  - returns to the atmosphere as evaporation
  - runs from high areas to low areas on the earth's surface
* accompanies storms.
* affects air system performance and reduces the effectiveness of radars.
* begins when the air cools and the water in the air condenses.
* changes over the northern hemispheric extratropics during the last hundred years
  - the fluxes of heat and water vapor from the ground
* creates runoff.
* decreases with latitude as one approach the dry belt of the two hemisphere.
* drives deer survival.
* evaporating into the air can saturate the atmosphere.
* exceeds evaporation.
* fall mainly in spring and autumn.
* follows patterns dictated by ocean currents and Earth's rotation.
* includes diamond dust.
* includes frost mist
* includes ice crystal
  - needles
  - snow mist
* increases the rate of regeneration.
* is acceleration
  - an amount
  - chemical processes
  - drops
* lowers the ocean's salinity by adding fresh water.
* occurs in clouds when rapid condensation takes place
  - several forms, including rain, snow, and hail
* occurs mainly during the winter and spring months
  - in the form of continuous or intermittent rain, snow, or drizzle
  - when water vapour cools
  - with heparin
* passes through adjacent zones
* produces runoff.
* refers to a. rain, sleet, snow and hail b.
* removes salt, guanidine and endotoxin from DNA in solution.
* results in accumulation
  - measurable accumulation
* separates heavy metals from the water they contaminate.
* starts in the cloud as snow.
* tends to be more acidic when a storm originates from a south-westerly direction
  - spread throughout the year, with heavy snow buildup during winter
* varies by both season and geographic area
  - greatly within the Antarctic Peninsula
  - regionally even more than temperature
* washes aerosols out of the air.