THE BAROMETER AND WEATHER
S henever my attention barometers and marine weather stations. A lthough at first was a matter more aesthetic than anything else, now could hardly do my job without at least a barometer.
E s known that the barometer measures atmospheric pressure, but this figure worth nothing to a good prediction; is more fluctuation in time, we provide guidance as to the prediction that the measurement of exact figures. E
s clear that hardly a barometer is factory calibrated to indicate the exact air pressure in our situation because, this varies depending on altitude and climatic factors such as anticyclones (high pressure) or depressions (low pressure ), quite variable in time.
Tapping the device on three different days, we observed that the air pressure has dropped from position 1 (no matter the extent of it), to position 3, remained stable in 3. How long will this drop in pressure to return to the previous situation (1)? often be as usual, lasting the same time it takes to go down to the last position (two days). To make these comparisons, the stations have not sneak cheap, so you can use a pen or similar marks for (1 and 2) that can be deleted later N ormally, low pressure indicates bad weather, while high pressure are signs of good. But high or low For what?
E sta answer does not the slightest importance for our purposes because, what matters to us is the variation in time the continued rise in several days indicate the advance high pressure (anticyclone ), while lowering continuously for several days, indicating the arrival of low pressure lasting (storms). E
sto same can occur in hours and the difference is the duration that the future weather situation will in time, sharp rises in the barometer (in hours), indicating good weather passenger. Likewise, sudden drops in pressure, indicating transient worsening (storm, for example).
P t may be deduced that, from a given stable weather, the variation of this will be maintained while the barometer has been slow to make a change before its arrival several days or just hours. E
n this regard there are many popular sayings and pick it up:
"Time coming slowly, also is reluctant to leave "
" Time declared soon, will soon leave "
Three positions at three different times of measurement. The change is important rather than the value of this ...
L I love to fish in the sea (also laughed, but not so clearly), they know that the only fish biting on a widespread, with the barometer to rise while the low, usually disappear. This will be a more local indication, which may give us an idea of \u200b\u200bwhat is coming in a few hours or that day. In this sense, also the popular proverb gives us reason
"Animals lazy, stormy weather"
Consult an analog barometer.
to
And I said, now, are the most common digital, but I still like the aesthetic analogue, and of course price. Ara P
check the air pressure in an analog is useless to wait for hours to the variation of the corresponding needle as this occurs, unless the product is high quality, practically does not move ... It is necessary to repeat the gesture was seen in the old movies to see any marker needle: take a few taps on the glass of the marker. After this, the needle moves, and no need to stop giving them while you continue moving, is in this last moment, which is to take the measurement, comparing with the previous variation and relaunched.
ara P values \u200b\u200bcomparing different days or at different times, often have a moving frame to be placed over the needle in the position of the last measurement, and in this way will we know if the following up or down.
In a marine barometer of precision (although analog) There are two needles: one that measures atmospheric pressure (2) and a reference work that meets for comparing two consecutive measurements in time (1) E n economic barometers, said moving part does not exist and can be replaced by a simple mark made with a pen on the glass. T
anto in the most precise, as in the most economical, it must point daily (or twice daily) measurements taken, so that for / s time / s necessary, we will complete history of changes in the previous days and we can anticipate and calibrate, the time duration of the prediction for the day of interest (I usually make a daily measurement, quit or not field work).
HYGROMETER
Fill S be a component of the elements that have weather stations and used to measure the relative humidity (%)
be used in the same way as the barometer, being required the familiar tap on the glass for a more accurate measurement
E ste device and do not consider it essential that we only serve to forecast rainfall occur hours, for this natural elements have much more precise that popularly described in the following sayings:
"If the swallow flies low, suspicious water"
"Ants in a hurry, a sign of bad weather"
P ut it is not usually miss most ever, are the poplars and their leaves, are a few cookies from rain is coming, so if you can do with hours or even a day in advance. Q
ue "said the smell of rain? Usually this means rain in the direction from which the wind blows in a few hours. H
to be thought that, this (hygrometer), is just one of the data that will help us in our forecast, but not alone: \u200b\u200ba water-laden clouds coming in one direction (south in Madrid, for example) will sign much safer than the hygrometer. I rarely reference soil and make it as a fact most in doubt. Javier
Azurmendi
October 2008 End of Fourth
third and final part: The local weather prediction, error
