What weather forecast symbol does an extra horizontal line on the capital F represent?

When F has more than one cross, and one cross is as long as the cross of F, this symbol indicates a 6-level wind. When it is not the same length, it means a level 5 wind.

Weather symbols are special symbols representing various weather phenomena, clouds and sky conditions. Includes weather phenomenon symbols for observation and recording and weather graphic symbols for media communication.

When observing a certain weather phenomenon, meteorological observers should record the corresponding symbols in the "Weather Phenomenon" column of the observation record book of the day, except for a few phenomena, and also record the starting and ending time. Based on these symbols, combined with the intensity, coexistence and some characteristics of weather phenomena, a group of symbols that can be filled in weather maps are called cartographic symbols.

Extended data meteorological terminology

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The daytime mentioned in the weather forecast refers to 8: 00 to 20: 00 local standard time, in which 17: 00 to 20: 00 is called evening; Call night after 20 o'clock to 8 o'clock the next day.

2. Weather conditions (sunny and rainy division)

A clear day means that the amount of clouds in the sky is less than 30% (that is, 30%); Cloudy is the sky condition when there are 4-70% medium-low clouds or 6- 10% high clouds in the sky; Partial cloudy is the sky condition when there are 1-3% medium-low clouds or 4-50% high clouds in the sky.

A cloudy day is a weather phenomenon in which the sky is dark and the clouds are densely covered, or even if there are gaps in the clouds, the sky still feels dark (accounting for more than 80% of the total amount of clouds), and occasionally weak sunlight can be seen from the gaps in the clouds.

Fog: A visible aggregate of a large number of tiny water droplets (or ice crystals) suspended in the atmosphere near the ground. The only difference between fog and clouds is whether they touch the ground or not. Fog greatly reduces the horizontal visibility of the ground. According to the regulations of the International Meteorological Organization, when the visibility drops below 1 km, it is called fog.

Cloud amount and cloud height: Cloud amount refers to the percentage of clouds covering the sky; Cloud height refers to the vertical distance from the bottom of the cloud to the ground of the station.

3. Temperature

The temperature mentioned in the weather forecast refers to the air temperature measured in the open air without direct sunlight (usually measured by blinds). The highest temperature is the highest temperature in a day, which generally appears at 14- 15, and the lowest temperature generally appears at 5-6 am.

Step 4 precipitate

Precipitation is divided into rainfall, snowfall, sleet and hail.

Rainfall: The meteorological department generally refers to the rainfall within 24 hours. Rainfall is generally divided into eight levels: sporadic light rain, light rain, shower, moderate rain, heavy rain, heavy rain, heavy rain, heavy rain, heavy rain and heavy rain. According to the 24-hour precipitation (mm), the rainfall grades are: light rain 0. 1 ~ 9.9, moderate rain 10.0 ~ 24.9, heavy rain 25.0 ~ 49.9 and heavy rain 50.0 ~ 99.9.

Hail: Hard spherical, conical or irregularly shaped solid precipitation.

Snowfall is divided into light snow, medium snow, heavy snow, blizzard and blizzard according to snowfall. Among them, blizzard is the snow with high snowfall intensity (the horizontal visibility distance is less than 500m during snowfall or the snowfall within 24 hours is greater than15 mm); Blizzard, also known as blizzard, is a weather phenomenon that strong winds carry a lot of snow and it is impossible to judge whether there is snowfall at that time, and the horizontal visibility is less than 1km.

5. wind

Wind refers to the horizontal flow of air. Expressed by wind direction and wind speed: the wind direction is divided into sixteen directions, which refers to the direction in which the wind blows; Wind speed is expressed in wind scale or m/s, and it is divided into average wind speed represented by 2-minute average situation and instantaneous wind speed represented by instantaneous situation.

References:

Baidu encyclopedia-weather symbols