how do they calculate snowfall?
116043
it's measured by inches on the ground. to calculate how much water it would be then 10 in of snow = 1 in of rain.
109204
it's all a bit relative since these days we also have "k"-value which is essential in forecasting precipitation.  it refers to the lift in areas of an airmass. for example, a thunderstorm can form, grow to 40,000 feet, drop its precipitation and go away in only a few minutes.  an area such as this would have a negative value for k, say minus 40 while a very stable area could be plus 40.  while the factors you refer to are important and useful indicators, consider that you can have any combination of humidity and pressure trend and it does not necessarily nean it will rain.  those parameters are the basis of centuries old meteorology and the principles have not changed all that much over time but then the forecasts delivered with these tools were marginal, at best.  the relationship principles you speak of were the basis for a guage to do precisly what you speak of. it's called a barometer and you can find all kinds of information on one on these any even probably find one to purchase for only a few dollars on e-bay or something. a borometer takes pressure trends, considers humidy and does give an estimated time in which precipitation would be expected.  accurancy?  well if i remember right only maybe about 60% or so but don't quote me there.
1164804
I don't know if this what you are looking for, but here is a page which gives many types of meteorological equations.\n\nhttp://members.aol.com/Accustiver/wxworld_calc.html
19857
Formula used to calculate wind chill\n\nThe term "wind chill" goes back to the Antarctic explorer Paul Siple, who coined it a 1939 dissertation, "Adaptation of the Explorer to the Climate of Antarctica." During the 1940s, Siple and Charles Passel conducted experiments on the time needed to freeze water in a plastic cylinder that was exposed to the elements. They found that the time depended on how warm the water was, the outside temperature and the wind speed.\n\nThe formulas used to calculate wind chill were based on those experiments.\n\nIn the fall of 2001, the U.S. National Weather Service and the Canadian weather replaced the formulas with new ones (one for Fahrenheit temperatures and one for Celsius readings). The new formulas are based on greater scientific knowledge and on experiments that tested how fast the faces of volunteers cooled in a wind tunnel with various combinations of wind and temperature.\n\nThe new formula for winds in mph and Fahrenheit temperatures is:\n\nWind chill temperature = 35.74 + 0.6215T - 35.75V (**0.16) + 0.4275TV(**0.16)\n\nIn the formula, V is in the wind speed in statute miles per hour, and T is the temperature in degrees Fahrenheit.\n\nNote: In the formula, ** means the following term is an exponent (i.e. 10**(0.5 ) means 10 to the 0.5 power, or the square root of V), - means to subtract, + means to add. A letter next to a number means to multiply that quantity represented by the letter by the number. The standard rules of algebra apply.\n\nFor reference, the old wind chill formula was:\n\nT(wc) = 0.0817(3.71V**0.5 + 5.81 -0.25V)(T - 91.4) + 91.4\n\nSource for both formulas: The National Weather Service
869615
Pressure changes affect the wind.  Temperature change determines whether it will rain or snow.
239486
on yahoo search.\ntype in weather.\nitll give you a shortcut.\nthen find a place on the website where it tells you to type in your city.\ndo that.\nthen youll get the forecast.
171991
Thats a difficult question. It all depends on air pressure, wind, temperature, humidity, distance of the clouds above the earth. Velocity of the snowflake. Mass of the snowflake. It's really dependent on the situation and the composition of each individual snowflake. No two conditions are the same.
219753
When people talk about what temperature it is, they are talking about the temperature at near ground level. However, this temperature is not the key to creating snow. Snow is typically formed much higher in the atmosphere from typically at 1000+ ft up in the air. So when ever you have moisture laden air cooled to below 32°F (0°C for your EU friends), snow will form and fall to the ground. If the temperature near the ground is below 32°F (30, 20, 10, etc), the snow will land. If the temperature is above 32°F, it may melt on the way down and show up as rain.\n\nNow there may be geographical and weather pattern reasons why it doesn't snow very often when it is below 32°F in France, but scientifically there is no reason it can not.
561756
Do you perhaps mean DETECTS precipitation??\n\nRADAR
154145
Or you could do it yourself using the formulas F=9/5C+32 and C=5/9F-32.  1 degree Fahrenheit is 5/9 of 1 degree celsius (and vice versa) and you add or subtract 32 degrees because freezing is 32F and 0C.
906593
As a forecaster, I use flurry to indicate light snow that is nothing but a nuisance to visibility and does not accumulate.\n\na snow "shower" is an intermittent period of light snow that causes very little accumulation and is not a major event.  But it's "worse" thana  flurry.
21574
It depends on the structure of the structure of the snow particles, whether the snow is wet or dry (that is on air and ground temperature). It can be 4:1 or 8:1, and anything in between. Again, these are approximate values.
44998
Different TV stations use different weather services for their weather forecasts.\n\nSome use Accuweather.  Some use the National Weather Service.  Others may use the Weather Channel as their source.\n\nEach of these services use different computer models and different human beings interpreting the results of these models to create their forecasts.\n\nWhen I go skiing near Lake Tahoe, I go with the National Weather Service because their predictions seem the most accurate and they include weather predictions about the snow level.  This is important because it tells me weather or not I'll be stuck driving behind someone with chains and weather I'll be skiing in rain/snow or dry, powdery snow.
92803
There are a lot of different types of snow, packed, dry, wet... so the exact weight of your snow would depend on that.\n\nTry picking a 1' x 1' square of snow, put it into a tupperware container and hop on a scale with it.  After weighing yourself with the snow, put it down and weigh yourself... take that difference and multiply it by 154.\n\nhave fun :-)
372526
some calculators can do this\n\nmathematica software will do it
465663
Snow is precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes. Since it is composed of small rough particles it is a granular material. It has an open and therefore soft structure, unless packed by external pressure.\n\nSnow is commonly formed when water vapor undergoes deposition high in the atmosphere at a temperature of less than 0°C, and then falls to the ground.\n\n\nIF YOU HAVE SOME ICE, GRATE it into small pieces. Then you have sorta what snow is! Similar to a SNOWCONE.\n\nCOLD, YUCKY, NOT FUN TO DRIVE IN OR SHOVEL, WET and NASTY STUFF!
65550
Snow forms when there is cold air (below freezing) and percipitation falls.  Snow is made out of ice crystals.  Sleet occurs when rain falls from warm air (above freezing) and passes through cold air (below freezing) on the way down, and freezes into ice pellets. (Note: If the air is warm (above freezing) and the objects on the ground are cold, the rain falls, then freezes onto the objects on the ground.  This is called freezing rain.)