I tried weater.com but it does not show the barometric pressure, do you know of another website?
476897
www.weatherunderground.com
554771
http://www.wrh.noaa.gov/mesonet/getobext.php?wfo=pih&sid=KLWV&num=168&raw=0\nwill give you hour-by-hour observations for the past week for the closest National Weather Service reporting station in the area, which is Lawrenceville-Vincennes International Airport.\n\nIt appears your station pressure was 29.496 inches of Mercury and falling.\n\nHope I was of help to you,\nGod bless,\nShane
827840
www.wunderground.com\n\ngreat website for looking up past weather
1065218
Meteorologists use the barometric pressure readings at various points across the land to get an idea of where the high & low pressure systems are.  Air molecules [and just about everything else fluid, for that matter] tends to move from high pressure to low pressure.  Further, the greater the pressure differential, the faster the motion of air.\nUsing this knowledge, and the spin of pressure systems, they can predict where the air is going.  Whatever is in the air is going there too.
770992
Try this one below.  Click on "US" and "Surface Analysis" to see the current highs, lows and fronts.  It's much easier to navigate than the NOAA website.
1146161
The barometric formula, sometimes called the exponential atmosphere, is a formula used to model how the pressure (or density) of the air changes with altitude. It is based on the simplifying (not very realistic) assumption that the temperature does not depend on altitude. However, this formula agrees reasonably well with the actual pressure and density variations above the earth's surface up to a height of about 450,000 ft (140 km).\n\n \np=p0exp(-Mg0z/RT)\n\n\n\n \nwhere h is the scale height, ρ (rho) is density, P is pressure, P0 is pressure at ground level (mean sea level pressure is 1013.25 hPa), M = 0.029 kg mol-1 (the mass of 1 mole of air), R = 8.314 J K-1 mol-1 is the gas constant, T is temperature, g0 is the acceleration due to gravity (about 9.8 m s-2 depending on your location) and z is the vertical height above the earth's surface.\n\nUsing the same principles, the above equation can be solved for altitude as a function of pressure. This formulation is known as the hypsometric equation.\n\nAs a rule of thumb, the pressure decreases by about 1% for every 80 metres increase in altitude.
147378
http://weather.yahoo.com
1096309
http://www.weather.com
1049007
http://www.weatherbug.com/
1169821
Here are some sites. Don't know exactly what you're looking for.\n\nhttp://www.lmnoeng.com/Flow/SmallOrificeGas.htm\nhttp://www.mysolv.com/OrificeCalcIn.asp\nhttp://www.gpengineeringsoft.com/pages/pdtpipedrop.html\nhttp://www.eng-applications.com/orifice.htm\nhttp://www.controlengineering.se/flowcalc/flowcalceng.htm\nhttp://www.pipeflowcalculations.com/
756925
The Weather Channel's website.... http://www.weather.com  put in your zip code and you can roam the site freely to find weather information pertaining to whatever area that you want!
605388
A barometer is an instrument used to measure atmospheric pressure.\n\n\n\n\n\nLiquid barometers\n\nWater-based barometers\nThis concept of "decreasing pressure means bad weather" is the basis for a primitive weather prediction device called a weather glass or thunder glass. It can also be called a "storm glass" or a "Goethe thermometer" (the writer Goethe popularized it in Germany).\n\nIt consists of a glass container with a WIDE spout. The container is filled with water up to about the middle of the spout; some air is left in the main body of the container. The design is such that when the air pressure decreases, the pressure of the air pocket inside the device will push some of the water up the spout. If the air pressure is low enough, some of the water may even drip out of the spout. These devices are essentially a water-based version of the mercury barometer. The "Thunder Glass" is extremely susceptible to the ambient temperature which will alter the height of the water column in the spout.\n\n\nMercury barometers\nA standard mercury barometer has a glass column of about 30 inches (about 76 cm) in height, closed at one end, with an open mercury-filled reservoir at the base. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on thle reservoir. High atmospheric pressure places more downward force on the reservoir, forcing mercury higher in the column. Low pressure allows the mercury to drop to a lower level in the column by lowering the downward force placed on the reservoir.\n\nThe first barometer of this type was devised by Evangelista Torricelli, a student of Galileo Galilei, in 1643. Torricelli had set out to create a perfect vacuum, and an instrument to measure air pressure. He succeeded in creating a vacuum in the top of a tube of mercury. Torricelli also noticed that the level of the fluid in the tube changed slightly each day and concluded that this was due to the changing pressure in the atmosphere. He wrote: "We live submerged at the bottom of an ocean of elementary air, which is known by incontestable experiments to have weight".\n\nThe mercury barometer's design gives rise to the expression of atmospheric pressure in inches or millibars: the pressure is quoted as the level of the mercury's height in the vertical column. 1 atmosphere is equivalent to about 29.9 inches, or 760 millimeters, of mercury. The use of this unit is still popular in the United States, although it has been disused in favor of SI or metric units in other parts of the world. Barometers of this type can usually measure atmospheric pressures in the range between 28 and 31 inches of mercury.\n\n \n\nAneroid barometers\nAnother type of barometer, the aneroid barometer, uses a small, flexible metal box called an aneroid cell. The box is tightly sealed after some of the air is removed, so that small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives a series of mechanical levers and other devices which are displayed on the face of the aneroid barometer.\n\n\nApplications\nA barometer is commonly used for weather prediction, as high air pressure in a region indicates fair weather while low pressure indicates that storms are more likely. Localized high atmospheric pressure acts as a barrier to approaching weather systems, diverting their course. Low atmospheric pressure, on the other hand, represents the path of least resistance for a weather system, making it more likely that low pressure will be associated with increased storm activities.\n\n\nCompensations\n\nTemperature\nThe density of mercury will change with temperature, so a reading must be adjusted for the temperature of the instrument. For this purpose a mercury thermometer is usually mounted on the instrument. No such compensation is required for an aneroid barometer.\n\n\nAltitude\nAs the air pressure will be reduced at a
374173
A barometer measures current atmospheric air pressure. It literally measures the weight of the atmosphere where you're located. Generally, the higher the barometric pressure the better your weather will be.
370259
www.theweatherchannel.com
225393
http://www.weather.com/services/desktop.html?from=svrhomepromo&refer=svrhomepromo\n\n\noops saw the other addinfo after posted.. sorry\n\nI used to have a good one awhile back and for the life of me cannot remeber, was very good/
93783
I think one has to recalibrate your barometer for every different location (including altitude), according to what I read on the internet and my intuition. \n\nI am working on a more quantitative analysis which I will try to complete to post here later.
25140
Oregon Scientific makes a good one:\nhttp://www.ambientweather.com/wmorscwiprwe.html\n\nYou can look at some alternates there too.