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Authoritative PPT Summary
"Weather Phenomena" Weather and Plants PPT Courseware
1. Characteristics of weather phenomena
Rain - Drop-like liquid precipitation that is clearly visible as it falls and changes in intensity slowly. When it falls on water, it will stir up ripples and splashes, and when it falls on dry ground, it will leave wet spots.
Showers - liquid precipitation that starts and stops suddenly, changes in intensity greatly, and is sometimes accompanied by thunderstorms.
Maomaoer - dense, fine and very uniform liquid precipitation, the falling situation is not easy to distinguish, it seems to float in the air with the weak movement of the air, and slowly fall. There is a sense of moisture on the face, but there are no ripples when it falls on the water. When it falls on dry ground, it just moistens the ground evenly without any wet spots.
Snow - solid precipitation, mostly white opaque six-branched star-shaped and hexagonal flake crystals, often falling slowly and changing in intensity slowly. When the temperature is high, they tend to fall in groups.
Snow Showers - Snowfall that starts and stops suddenly and changes in intensity.
Sleet - Semi-melted snow (wet snow), or rain and snow falling together.
Showers of sleet - sleet that starts and stops suddenly and changes in intensity greatly.
2. Observation and recording
1. Observe and record the various weather phenomena listed above that occur within the viewing area.
2. Observe and record all weather phenomena that occur during duty hours at any time. Stations that are not on duty at night should try their best to judge and record weather phenomena that occur at night.
3. All phenomena related to horizontal visibility shall be subject to effective visibility and must be measured and judged at the visibility observation location.
4. Weather phenomena are recorded in the observation book using the following symbols.
3. Records in the minutes column of the observation book
1. When certain severe weather phenomena cause disasters locally or within the county, investigate and compile records in a timely manner. The investigation content includes: scope of impact, location, time, intensity change, direction path, disaster range, damage extent, and should be supplemented by photos when necessary.
2. The flooding, freezing, and thawing conditions of rivers, lakes, and seas near the station should be recorded.
3. If traffic is interrupted on railways, highways and main roads near the station due to rain, sand obstruction, snow obstruction, mud, mud, flooding, etc., investigation and recording should be carried out.
4. A brief description of the mountain snow in the station’s viewing area: mountain name, direction, start and end dates (within this month).
5. The maximum diameter value of the largest hailstone and the maximum average weight value of hailstones, as well as the contents recorded in each chapter.
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