scientists discovered a bacterial species which is a part of raining process.it is the ice forming bacteria Pseudomonas syringae. in this slide i share you the process of raining by bacteria.

1. RAIN CAUSING
BACTERIA

2. During a cloudburst we often say that it’s raining “cats and
dogs”. In reality, it’s actually raining bacteria; a natural
phenomenon that presents no cause for alarm. The sky, once
thought of as a sterile void, is actually teeming with bacteria,
which are vital for watering the plants below. Biological
precipitation, or the "bio-precipitation" cycle as it is called,
starts when bacteria form colonies on the surface of plants.
Winds will then sweep the bacteria into the atmosphere, and ice
crystals form around them.
Bacteria like Pseudomonas syringae and other species found on
the surface of plants leaf.
Introduction

3. The fact that bacteria like Pseudomonas syringae nucleate ice crystals has been
known for decades. They can be used for gee-whiz science demonstrations, and, at
a much larger scale, as one method for creating artificial snow. On the flip side, the
presence of Pseudomonas syringae is also also makes plants more likely to be frost
damaged at temperatures just below freezing. Only in the last several years,
though, has the role of bacteria in producing precipitation from the atmosphere
begun to be appreciated.

5. During evaporation these bacteria goes from the surface of plant’s leafs and reach to the
Atmosphere. In atmosphere there are different levels of cloud on witch ice crystal
Formation starts.
In the cirrus level of cloud they need some support or base to begin the ice crystal formation.
The base may be
 Dust particle
 Dust particle comes from outside the earth
 Bacteria

7.  Dust and soot particles can serve as ice nuclei, but biological ice nuclei are capable
of catalysing freezing at much warmer temperatures. The ice-nucleating bacteria
currently known are mostly plant pathogens. These pathogens can cause freezing injury
in plants.
 The bacteria are found in snow, soils and seedlings in locations such as Antarctica, the
Yukon Territory of Canada and the French Alps, according to Brent Christner, a
microbiologist at Louisiana State University.
 According to this finding plants are also responsible for causing rain.