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What is high-pressure?
When the atmospheric pressure is above 1013.25 MB (millibars or the equivalent of 29.92 inches of mercury), an area is considered to be under high pressure. This implies that the atmosphere is "denser" and therefore the air tends to sink. Winds flow in a clockwise motion around the center of high pressure.

What is a Bermuda high pressure?
The Bermuda High is a semi-permanent high-pressure system located over the western Atlantic Ocean. This high-pressure core is commonly found during the summer months and gives the southeast US a moist and warm southerly flow.

What type of weather should I expect when a high pressure is over our area?

If the center of the high pressure is located above us, one can expect calm winds with a lack of cloud cover and precipitation. During the summer months, the temps are usually high, while the opposite is true in the winter.

What is low pressure?
When the atmospheric pressure is below 1013.25 MB (millibars or the equivalent of 29.92 inches of mercury), an area is considered to be under low pressure. This implies that the atmosphere is "less dense" and therefore the air tends to rise. Winds flow in a counter-clockwise motion around the center of low pressure.

What type of weather should I expect when a low pressure is over our area?
Since the air is rising underneath an area of low pressure, one can expect plenty of clouds and most likely precipitation. This is due to the cooling and condensing of the lifted air (standard water cycle stuff).

What is a Nor'easter?
A Nor'easter is a low-pressure system, typically in winter, which intensifies rapidly off the east coast of the US. The warm Gulf Stream waters feed the system and tend to produce heavy rain or snow and wind along the mid-Atlantic and northeastern US states.

What is a cold front?

A cold front is the leading edge of a relatively cold air mass that replaces warm air. On a weather map, it is indicated by a blue line with triangles pointing upward.

What is a warm front?

A warm front moves into an area and replaces colder air with warmer air. It appears as a red line with half circles pointing downward.

What is a stationary front? (also known as a quasi-stationary front)
It is a front that has not moved very much from one location to another in a three to six hour period. It appears as a combination of an alternating cold and warm front on a weather map.

What is an occluded front?

A developing cyclone typically has a preceding warm front (the leading edge of a warm moist air mass) and a faster moving cold front (the leading edge of a colder drier air mass wrapping around the storm). North of the warm front is a mass of cooler air that was in place before the storm even entered the region. As the storm intensifies, the cold front rotates around the storm and catches the warm front. This forms an occluded front, which is the boundary that separates the new cold air mass (to the west) from the older cool air mass already in place north of the warm front. On colored weather maps, an occluded front is drawn with a solid purple line.

What does radiational cooling mean?
First of all, it doesn't have anything to do with nuclear material. When skies are clear and winds are light or calm, the heat accumulated during the day rapidly rises, or radiates, upwards. This results in a quick drop in temps shortly after sunset and often brings us lows that drop all the way to the dew point temp.

What does VIPIR mean?
Volumetric Imaging and Processing of Integrated Radar.   VIPIR is a real-time 3D weather analysis and forecast graphics system. From storm tracking and wind shear detection to snow analysis and forecast data products, VIPIR is a veritable weather office in a box.

How do you explain the heat index?
The human body cools itself off when hot by perspiration. In theory, our sweat would evaporate into the air and thus cool us off (Latent heat processes at work). However, when the air is more saturated with moisture (muggy) then our sweat doesn't evaporate as well. The heat index combines heat with humidity to give a "feels like" temperature that accounts for our body's inability to cool itself off as well under humid conditions. The number given is what it "feels like" to our body if we were standing outside in the shade and standing on grass.. It would feel even hotter in the sun or on pavement.

How do you explain wind chill?
The human body produces heat. This heat radiates out of our skin and into the surrounding air. When there is no wind, this thin layer of heat partially insulates us from the full effect of the cold surrounding us. When conditions are windy, this layer of heat is swept away from the body and thus the full impact of the cold air is felt on our skin. Thus, even though the actual air temperature is the same when windy, it "feels" colder. The wind chill temperature gives a comparison to what it would feel like at a lower temperature if there were no wind.

What is the difference between partly cloudy and partly sunny?
Partly Cloudy skies means simply: "Part Clouds" - Most Sun. Partly Sunny skies means simply: "Part Sun" - Most Clouds. In other words.Partly Cloudy is 'more sunny' than Partly Sunny.

What is the difference between isolated and scattered?
Scattered is a more common occurrence than isolated. In other words, you are more likely to see rain when there is a chance of "scattered showers" than when there is a chance of "isolated showers".

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