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In meteorology, "precipitation types" can include the character or phase of the precipitation which is falling to ground level. There are three distinct ways that precipitation can occur. Convective precipitation is generally more intense, and of shorter duration, than stratiform precipitation. Orographic precipitation occurs when moist air is forced upwards over rising terrain, such as a mountain. Precipitation can also fall in either liquid or solid phases, or transition between them. Liquid forms of precipitation include rain and drizzle. Rain or drizzle which freezes on contact within a subfreezing air mass gains the preceding adjective "freezing", becoming known as freezing rain or freezing drizzle. Frozen forms of precipitation include snow, ice needles, sleet, hail, and graupel. Intensity is classified either by rate of fall, or by visibility restriction. ==Phases== Precipitation falls in many forms, or phases. They can be subdivided into: * Liquid precipitation: * * Drizzle (DZ) * * Rain (RA) * Freezing precipitation: * * Freezing drizzle (FZDZ) * * Freezing rain (FZRA) * * Rain and snow mixed / "Snain" (RASN) * Frozen precipitation: * * Snow (SN) * * Snow grains (SG) * * Ice pellets / Sleet (PL) * * Hail (GR) * * Snow pellets / Graupel (GS) * * Ice crystals (IC) * Fog condensation on vegetation foliage, dripping on forest soil.〔(【引用サイトリンク】 Quantification of cloud water interception )〕 The parenthesized letters are the METAR codes for each phenomenon.〔(【引用サイトリンク】 METAR Conversion Card )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Precipitation types」の詳細全文を読む スポンサード リンク
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