Weather Dudes







Welcome to WEATHERDUDES.COM... We are currently focused on weather and climate of the Hampton Roads area of Virginia and the East Coast, as well as other significant national and global weather events that occur. The intent of this site is not to be just another weather website with five day forecasts featuring happy suns and sad clouds It is to provide various interesting and personalized features, which provide the visitor with a view of the weather from a different perspective.
Currently we have:
Dave's Weather Discussion Page, providing an insight to the local weather conditions and patterns, and the reasons behind the weather.
Tropical Weather, A collection of tropical storm and hurricane resources.
Recent Weather, Weather conditions for the past 10 days for the mid-Atlantic area.
Weather Glossary, Providing weather definitions from A to Z.
Links to Weather Sites, providing a growing collection of links to weather sites.
Weather Facts, A collection of interesting weather facts.
We will be adding more features on a regular basis. Feel free to look around, and let us know what you think. Check back often for new content...

Dave's Weather Discussion

AN UNSETTLED WEATHER PATTERN WILL CONTINUE THROUGH THE HOLIDAY WEEKEND DUE TO A STATIONARY FRONTAL BOUNDARY

Current Conditions

Random Weather Fact

What Causes Wind?


Wind is caused by the difference in pressure from one point on the earth's surface to another. The air moving from the area of higher pressure to the area of lower pressure is called wind. The air does not move directly from the point of highest pressure to the point of lowest pressure. The earth's rotation affects the air flow by deflecting it to the right. This effect is called the Coriolis Effect. In the Northern Hemisphere, this causes air to flow clockwise around high pressure areas and counter-clockwise around low pressure areas. Now, you may ask - What causes the difference in pressures on the EarthÝs surface? - The answer to that is quite complex so I won't go into great detail here. Generally, you could say that the cause of the difference in pressure across the globe is the uneven heating of the Earth's surface from the sun. This is due to several factors. Land warms and cools much faster than water. And, of course, latitude affects how much solar radiation is received each day and returned to space each night.. In addition, topography has an effect on solar radiation. Even the types of vegetation affect how much sunlight is absorbed and reflected. Snow cover plays a major role in absorbing solar radiation. Snow cover reflects a huge amount back to space. As air cools over the northern latitudes, it sinks to the surface and the air pressure increases. This results in the huge arctic high pressure areas that frequently develop over Canada. There are other elements that influence the amount of solar heating distribution, but these are the major ones. High pressure and low pressure areas form due to these factors and the battle zones that form between the air masses (the fronts) create the low pressure areas. The pressure gradient or the difference in pressure over a certain distance, determines the strength of the wind. As warm air rises in the developing frontal system (or extra-tropical storm), air pressure drops. Then, surrounding air moves in at the surface to replace the air that has risen. This is called "wind". This flow of air is deflected to the right by the Coriolis Effect. This is a very simplified way of explaining a very complex and technical process that goes on to create a storm system. Now, tropical storms and hurricanes produce wind by lowering air pressures in the center of the low pressure area. The pressure gradient is more extreme in these storms since the difference in pressure is greater over a very short distance (between the center or eye of the storm to the outer edge of the storm's circulation). There are localized wind systems, such as "sea breezes". (Please see the weather fact I added explaining sea breezes in detail).

Source: Dave