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


Current Conditions

Random Weather Fact

How are tropical cyclones different from tornadoes?

While both tropical cyclones and tornadoes are atmospheric vortices, they have little in common. Tornadoes have diameters on the scale of 100s of meters and are produced from a single convective storm (i.e. a thunderstorm or cumulonimbus). A tropical cyclone, however, has a diameter on the scale of 100s of *kilometers* and is comprised of several to dozens of convective storms. Additionally, while tornadoes require substantial vertical shear of the horizontal winds (i.e. change of wind speed and/or direction with height) to provide ideal conditions for tornado genesis, tropical cyclones require very low values (less than 10 m/s [20 kt, 23 mph]) of tropospheric vertical shear in order to form and grow. These vertical shear values are indicative of the horizontal temperature fields for each phenomenon: tornadoes are produced in regions of large temperature gradient, while tropical cyclones are generated in regions of near zero horizontal temperature gradient. Tornadoes are primarily an over-land phenomena as solar heating of the land surface usually contributes toward the development of the thunderstorm that spawns the vortex (though over-water tornadoes have occurred). In contrast, tropical cyclones are purely an oceanic phenomena - they die out over-land due to a loss of a moisture source. Lastly, tropical cyclones have a lifetime that is measured in days, while tornadoes typically last on the scale of minutes.

Source: NOAA