Partly Sunny. It can measure the pressure exerted by the atmosphere by using water, air, or mercury. By David Green. Pressure tendency can forecast short term changes in the weather. It shows: - Your local pressure - The pressure reduced to the mean sea level (the value that every weather forecast service use) - The pressure got from the nearest airport - Latest 24 hours pressure chart Excellent for fishing or if you are simply interested in weather trend. Barometric pressure is the measure of air pressure in a given area. Updated April 24, 2017. Please contact the FAA for more information on pilot briefings or call 1-800-WX-BRIEF (800-992-7433). Storms are associated with low air pressure. The chart curve represents the rate of change over this allotted time period. Chart and data: Station Pressure - Hourly data (24 hours) for Toronto for Toronto, Ontario, Canada Local weather by ZIP or City Local area snow depth CURRENT WEATHER MAPS Fronts & Pressure Centers Current U.S. Air pressure is the weight of air pressing down on the oceans, land and surface of the earth and is measured with a barometer. Barometric Pressure Reports (inHg) Report for Year 2020 Data last updated 12/8/2020 08:55 AM. 7 Day Barometric Pressure. Extended Forecast for Reading PA Overnight. Barometer: 29.88 in (1012.7 mb) Dewpoint: 19°F (-7°C) Visibility: 10.00 mi: Wind Chill: 23°F (-5°C) Last update: 7 Dec 1:54 am EST : More Information: Local Forecast Office More Local Wx 3 Day History Mobile Weather Hourly Weather Forecast. Nampa barometric pressure today from 12:56 AM on Tue, Nov 24th 2020 until 7:56 AM. Barometer (HPA) Previous 24 hours. 48 hour barometric pressure. Barometric Pressure Reports (inHg) Report for Year 2020 Data last updated 12/7/2020 5:10 PM. Low: 25 °F. An example of a 12-hour barometric pressure history chart is pictured on the right. The following chart outlines hourly Nampa barometric pressure today (Tue, Nov 24th 2020). Monday. Rising or High Barometric Pressure As the storm leaves the air pressure will tend to rise gradually and is associated with approaching fairer weather. Here you have an accurate barometer with an elegant analogical dial. 2 Day Barometric Presssure The lowest barometric pressure reading has been 30.13 inHg at 12:56 AM, while the highest recorded barometric pressure is 30.21 inHg at 7:56 AM. Temperatures Northwest U.S. Northeast U.S. Mid-Atlantic U.S. Midwest U.S. Central Plains U.S. Southeast U.S. Southern Plains U.S. Southwest U.S. Alaska Partly Cloudy. A barometer is an instrument used to measure atmospheric pressure. Rising barometric pressure is a good indicator that no storms are developing in the following 24 hrs and there will be fair weather or no precipitation. What is a barometer? 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