![]() These examples are programmatically compiled from various online sources to illustrate current usage of the word 'rainfall.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2024 The rainfall Tuesday was part of a larger series of snow and rain storms that have affected the Midwest, Southeast and east coast. 2024 All told, a shift in annual rainfall had rapidly resulted in a change in the birds’ beaks. 2024 From the Florida panhandle to Alabama and Georgia, the South will start experiencing heavy rainfall by Saturday morning. 2024 At around 50 decibels when in use, this isn’t going to be much louder than a quiet refrigerator or maybe a moderate rainfall. 2024 Still, because the ground is so wet from recent rainfall, the Weather Service has issued a flood watch from 6 p.m. Staff Reports, Hartford Courant, 12 Jan. 2024 The weather service forecast possible flooding caused by excessive rainfall and in Connecticut named part of Fairfield, New Haven, Middlesex, New London, and Fairfield countries. Jack Thompson, The Christian Science Monitor, 19 Jan. 2024 Annual rainfall could drop by 38% in Senegal in the coming decades, a threat to the way of life for the nation’s 8 million farmers. The Dust Bowl was the name given to the drought-stricken southern plains region of the United States, which suffered severe dust storms during a drought in the 1930s. Grace Toohey, Los Angeles Times, 22 Jan. This harms aquatic ecosystems because plants and animals often cannot adapt to the acidity.Recent Examples on the Web In Los Angeles County, rainfall came earlier in the day, with several reports of roadway flooding during the morning commute, including a majority of lanes shut down on the southbound 405 Freeway in Long Beach. Acid rain does not harm humans directly, but it can make lakes and streams more acidic. The precipitation that results from this is called acid rain. However, in some cases, pollutants in the atmosphere can contaminate water droplets before they fall to the ground. This is because sea salt does not evaporate with water. Precipitation is always fresh water, even when the water originated from the ocean. The indents on raindrops are caused by air resistance. These extra-large drops usually end up splitting into two smaller droplets. Very large rain drops (larger than 4.5 millimeters (0.177 inches)) have a huge indent and look more like a parachute. They look more like kidney beans when falling. Larger raindrops (two to three millimeters (0.078-0.118 inches) across) are also round, but with a small indent on their bottom side. In fact, smaller raindrops (ones that are approximately one millimeter (0.039 inches) across) are almost perfectly spherical. This helps water droplets gather together and become large enough to fall to the earth.Ī common misconception is that when raindrops fall, they have a teardrop shape. These particles, called “condensation nuclei,” provide a surface for water vapor to condense upon. Particles of dust or smoke in the atmosphere are essential for precipitation. When the water vapor is deposited into either metallic or rocky dust, the ice crystals form. As the snowflakes fall through warmer air, they become raindrops. Cirrus clouds typically form as the result of water vapor interaction with the rise of warm, dry air. ![]() Most rain actually begins as snow high in the clouds. These ice crystals then fall to the earth as snow, hail, or rain, depending on the temperature within the cloud and at Earth’s surface. If a cloud is colder, like it would be at higher altitudes, the water droplets may freeze to form ice. ![]() When the drops are heavy enough, they fall to the earth. Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. Along with evaporation and condensation, precipitation is one of the three major parts of the global water cycle. It comes in many forms, like rain, sleet, and snow. ![]() Precipitation is any liquid or frozen water that forms in the atmosphere and falls back to the earth.
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