PPT-ISOBARS

Familiar idea new focus Isolines review An isoline is a line connecting points of equal value Examples of isolines Contour points of equal altitude Isotherms points of equal temperature. Isobars are lines on a weather map that join places of equal pressure . Meteorologists collect information from weather stations, buoys and ships and then Image courtesy of the Bureau of Meteorolo Where Isobars Pressure Maps . Take a look at the map and discuss what you notice with your group.. Air pressure is important for understanding weather!. Labeling Parts of a Pressure Map. The numbers- represent atmospheric pressure measured in . “Whirlwind Theory”. Rotation. Coriolis. Espy. Convergence into Low. PGF. 1841. Loomis. Rotation AND Convergence. 1860. Early Maritime Observations (Winds). http://m.nautil.us/issue/25/water/the-dueling-weathermen-of-the-1800s. Geography Skills. Weather maps provide a simplified depiction of the current or predicted weather conditions of an area. .. Weather maps. Understand . general concepts of the weather. . What most people are concerned with is precipitation, which, in meteorology (the study of weather), is any form of water that falls onto the Earth's surface. . 003. 9/24/14. LAB 4 due this Friday, September . 26 before class. Terrain Effects on Rain. Windward . side of mountains makes air rise/enhances precipitation. .. Rain shadow on leeward sides. RAIN SHADOW. What . is an . isobar?. How . does wind move? (high to low, low to . high). List . three characteristics of low pressure and three characteristics of high pressure.. Air Movement: Weather. Objective: Understanding how air moves through the atmosphere to affect weather.. The National Weather Service counts on two sources for information:. Radar. Weather Balloon. Data collected from the atmosphere. Data collected from the Earth’s surface . In order to forecast the weather, meteorologists make measurements of:. Pressure Maps . Take a look at the map and discuss what you notice with your group.. Air pressure is important for understanding weather!. Labeling Parts of a Pressure Map. The numbers- represent atmospheric pressure measured in . NGS. How Does Air Pressure Affect Weather?. How much the earth. ’. s atmosphere is pressing down on us. Measured with a . BAROMETER. If it . CHANGES. , then new weather is on the way:. Falling Air Pressure = . Upward pressure gradient . force (PGF) . is balanced by . gravity (g).. HYDROSTATIC RELATIONSHIP. Despite very strong vertical pressure gradients, vertical. winds (rising and sinking air) are generally weak.. Every 5 hPa: ... 990, 995, 1000, 1005, 1010, .... Tend to be roughly parallel to one another. Isobars can . never. intersect. If . an isobar starts on the map border, then it ends on the map border. Problem 6.11 (a, b). Mark all centers of High and Low pressure (and 2 locations where it might be off the map). Check surrounding isobars . Find 2 troughs and 2 ridges. Trough:. elongated region of low pressure. REVIEW OF KEY FORCES. Pressure gradient force (PGF). High to Low. Perpendicular to the isobars. Proportional to isobar spacing. Coriolis. force (COR). Acts to . right. of parcel direction in N. Hemisphere.