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Q: How can I determine weather conditions using only four factors? ( No Answer,   7 Comments )
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 Subject: How can I determine weather conditions using only four factors? Category: Science > Earth Sciences Asked by: stuckfly-ga List Price: \$50.00 Posted: 11 Apr 2006 10:40 PDT Expires: 11 May 2006 10:40 PDT Question ID: 717867
 ```Nevermind the reason, but my task is to predict unique climate conditions by a combination of four attributes in a database, such that every combination makes sense and all four attributes are involved in every unique result. I have four input channels available and must use them all; I need to know what to monitor for each channel. Visualize a table in which there are five columns. The first four contain values for each of four weather factors. Currently, I have Wind, Humidity, Pressure, and Temperature. The fifth column contains the resulting climate condition (generalized, unique, two-word descriptions like blizzard or thunder storm) for each combination of weather factors. By "unique" I mean climate conditions that are sufficiently different from each other that it would make sense to display a different symbol or icon (e.g. "rainy" and "drizzling" would result in the same icon on a weather map, thus not unique). My present system is not working, for at least three reasons: 1) I am not familiar enough with meteorological nomenclature to briefly describe enough climate conditions, 2) some weather factor combinations do not make sense to me (e.g. is it possible to have high wind + low humidity + low pressure + low temperature?), and 3) I may have selected the wrong four factors. In my current table, wind can be "calm", "1-5 mph", "6-25 mph", or "greater than 25 mph". The other three factors can be high or low. What I need is for an expert to correct the system I described above, add or modify the values available to the weather factors, and fill in the results for each possible combination of the factors using only a few words. Details: The results must be short because they will be used in another database that limits the field length for the "weather description" field to 20 characters. There must be four weather factors involved in producing every climate result, no more and no less. If this is impossible then I will need to know what combinations are invalid, so I can flag my input data when those combinations occur, and remap them to an appropriate result. Using my current system, there are 32 possible combinations. Of course, order has nothing to do with the number of unique combinations (hot/dry is the same as dry/hot). Currenty, wind is the only field with more than two possible values. It could be redefined with no less than three or no more than five ranges because any more radical change would generate too few or too many result possibilities. Wind does not have to be the field with more than two values, it could be another factor. Another factor could have up to three values, but the other two must only have two values. There are two reasons: 1) of my four input channels, one is variable, one has three possible signals it registers (on/off/out-of-range), and the other two have only two signals they register (on/off); and 2) these signal options allow for 24 - 60 possible results; 24 might be too few possibilities for my purpose and 60 would almost certainly be too busy to graph the way I need to. I set the base fee at \$25 because the minimum answer would be to keep my existing system and simply fill in all 32 UNIQUE climate descriptions using no more than 20 characters each, which for an average expert ought to take half an hour. But, I can and will pay a bonus for a complete solution depending on how closely it satisfies the directions above. If you are a pro and you expect \$150/hr then don't spend much time on this! It's for a hobby project, not a business or a job; I don't have a large budget to hire a pricey consultant or I wouldn't be posting my problem here.```
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 Subject: Re: How can I determine weather conditions using only four factors? From: pugwashjw65-ga on 11 Apr 2006 13:05 PDT
 ```Hang a rock on a string. 1. If it is wet,,,it is raining. 2. If it is dry and hot... the sun is shining, and it is summer 3. If it is white and cold...it is snowing, and it is winter 4. if it is moving on the end of the string...the wind is blowing and it could be stormy. Q.E.D. JUST JOKING.```
 Subject: Re: How can I determine weather conditions using only four factors? From: qed100-ga on 12 Apr 2006 08:16 PDT
 ```You say you've a fifth column? Be very careful with the fifth column. During World War 2 the Fifth Column was hell-bent on sabotaging the war effort! Buy bonds!```
 Subject: Re: How can I determine weather conditions using only four factors? From: frankcorrao-ga on 12 Apr 2006 10:21 PDT
 ```Why have you assumed that you can describe all possible weather conditions with 4 factors? Why have you assumed that there are only 32 possible climate conditions?```
 Subject: Re: How can I determine weather conditions using only four factors? From: stuckfly-ga on 12 Apr 2006 10:38 PDT
 ```:-D Well, at least my question is generating some good comments. Weather rocks! Bonds? James's bonds?```
 Subject: Re: How can I determine weather conditions using only four factors? From: stuckfly-ga on 12 Apr 2006 10:59 PDT
 ```frankcorrao-ga: I haven't assumed either. I realize it's not strictly feasible to define weather so simply. Super computers are still working on that. I'm merely limited by my existing data collection gear, expertise, budget, and time. I hope to trade a reasonable portion of my funds for a better approximation of the 24-60 most recognized patterns based on the four most common of many influences than I can devise myself.```
 Subject: Re: How can I determine weather conditions using only four factors? From: byrd-ga on 12 Apr 2006 11:02 PDT
 ```Hi stuckfly-ga, I can't really help much with the statistical aspects of this question as my knowledge of databases and such is much too limited, but if you'd like to increase your knowledge of meteorology, here's a good place to start: http://www.free-ed.net/free-ed/Science/EarthSci/MeteorAcad/default.asp As for short descriptions of weather, aviation weather reporting uses what are known as METAR/TAF abbreviations, which might possibly be of some help to you. Here's a list of them: http://www.alaska.faa.gov/fai/afss/metar%20taf/metcont.htm Good luck, sounds like an interesting project. Best, Byrd-ga```
 Subject: Re: How can I determine weather conditions using only four factors? From: boggbee-ga on 12 Apr 2006 11:28 PDT
 ```Perhaps I got this wrong, if so, please bear with me.. In the 4 fields you described, how about rain, or snow? I'd suggest to replace pressure (it's kinda vague anyway, at least for me) with, well, I don't know the exact term for it, but here goes: Wind: none - weak - mild - strong - extraordinary Humidity: dry - normal - humid Things-that-drop-from-the-sky: none - rain - snow - ice Temperature: very low - low - mild - hot - very hot Obviously, some combinations would be null, like snow on very hot temperature. But still the above produces 300 combinations, and I guess at least 100 would be logical. Just my two cents.```