| 词条 | Precipitation shaft |
| 释义 |
A precipitation shaft is a weather phenomenon, visible from the ground at large distances from the storm system, as a dark vertical shaft of heavy rain, hail, or snow, generally localized over a relatively small area. This is different from a virga, which is a shaft of precipitation that evaporates before reaching the ground. FormationA precipitation shaft is mostly found underneath convective clouds, like cumulonimbus cloud or cumulus congestus cloud during a downpour storm, as these have well defined vertical drafts (updrafts and downdrafts). However, an advancing nimbostratus cloud could have a diffuse precipitation leading edge.{{citation needed|date=April 2016}} Developing rain shafts often have a fuzzy, bulbous appearance as they descend. If a source of dry air is present at higher altitude and the air into which the rain is falling is sufficiently warm, then strong, and possibly damaging microbursts are possible.[1] See also
References{{Commonscat|Praecipitatio}}1. ^{{cite web|title=Rain Shaft has a fuzzy, bulbous appearance|url=http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/svr/comp/out/micro/dvp.rxml|website=Weather World 2010|accessdate=22 April 2016}} {{climate-stub|date=20 April 2016}} 1 : Precipitation |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。