To decode sea level barometric pressure, follow these steps: 1) Place a decimal

Question

To decode sea level barometric pressure, follow these steps: 1) Place a decimal point to the left of the last digit. (For example, in the sample below, 147 becomes 14.7) This pressure reading is really a 4-OR-5 DIGIT NUMBER, not a 3-digit number Next, you have to determine what goes in front IT WILL EITHER BE A "9" OR A "10." a) 2) If the current number falls between 56.0 and a 99.9, place a "9" before the first digit....OR... If the current number falls between 0.0 and 55.9, place a "10" before the first digit. (So, in the example below, 14.7 becomes 1014.7 mb pressure) b) Cloud type (High cirru Cloud type Middle altocurnulus) Total amount of clouds Sky completely covered) Barometric pressure at sea leval. Initial 9 or 10 omitted (1014.7 mb) Wind speed (18 to 22 knota) Direction of wind From the northwest) Amount of barometrio change in past 3 hours (In tenths of mb) Temperature in degrees Fahrenhelt Barometric tendency n past 3 hours (Risingl 34 147 Visibility Sign showing whether pressure is higher or lower than 3 hours ago Present weather (Continuous slight snow in fakes) Dewpoint in degrees Fahrenheit Cloud type Low fractostratus andvor fractocumulus) Height of cloud base (300 to 599 feet) Part of sky cavered by lowest cloud (Sevon- or eight-tenths) Time preclpltation began or ended (Began 3 to 4 hours ago) Weather in past 6 hours (Rain) Amount of precipitation in last 6 hours

Explanation / Answer

Let if in the weather station code shows barometer reading of 196 unit then to convert it to the real atmospheric pressure the following procedures should be done

Put the decimal before the units digit no. Here before 6 in 196 which becomes 19.6

Now the atmospheric readings should be at least 3-4 digits, so to make them 3-4 digit no add some prefixes which are-

If the leftmost part of no.(left to decimal) is between 0.0 to 55.9 then place ‘10’ before the first digit

If the right most part of no.( right to decimal) is between 56-99.9 then place ‘9’ before the first digit

With our case no is 19.6

Before decimal digit is 19 which lies in between 0.0- 55.9 so the prefix would be 10 and the atmospheric pressure becomes 1019.6 mb

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