The Relationship Between Pressure Gradient & Wind Speed | Sciencing
This band of surface convergence, forced rising air, and clouds is easily seen on . Relationship between surface pressure and wind speed for a number of. Apr 24, Wind speed and air pressure, also called barometric pressure, are closely related . Wind is created by air flowing from areas of higher pressure. The four elements of weather -- temperature, air pressure, wind and moisture -- interact with one another. For example: Surface temperature.
In fact, most severe hurricanes that affect the United States begin as easterly waves, which move of the continent of Africa. More information and a diagram can be found in this African Easterly Wave Link Click on the image to zoom. Usually these easterly waves are relatively weak until they move into the warmer waters in the western Atlantic, Caribbean, and Gulf of Mexico. Although most of the severe hurricanes that affect the United States begin as easterly waves that move off Africa and across the Atlantic, there have been many cases where hurricanes initially formed much closer to the United States -- in the Carribean and Gulf of Mexico.
In those cases it often appears that a region of surface convergence or upper-level divergence with an associated area of disorganized thunderstorms eventually develops rotation and strengthens. Types of Tropical Cyclones Tropical cyclone is the generic name given to a surface low pressure system over tropical waters, with organized convection i.
Here again is the surface weather map showing Hurricane Katrina in August Recall from the previous reading pages that the ground surface winds around a circular area of lower pressure in the Northern Hemisphere are mostly counterclockwise, but also inward. The speed of the wind depends on how rapidly air pressure increases in moving out from the low pressure center.
As described in Figure J, the speed of the wind and strength of the storm depends on how low the central pressure gets.
Wind & Air Pressure
Remember that the average sea level pressure is about mb As a tropical cyclone intensifies, it is classified according to wind speed. These storms are given different names in other ocean basins: Typhoon is used in the north Pacific Ocean west of the dateline Severe Tropical Cyclone is used in the southwest Pacific Ocean west of the dateline and in the Southeastern Indian Ocean Severe Cyclonic Storm is used in the north Indian Ocean Tropical storms and hurricanes are the only natural disasters which have their own names e.
Names seem appropriate because we commonly come to know hurricanes long before they strike land, often watching these storms move across the oceans for days or even weeks. By contrast isolated severe thunderstorms and tornadoes develop suddenly and last only hours. Hurricanes are much larger than an individual severe thunderstorm cell and are more correctly described as being composed of an organized clustering of thunderstorms.
They are quite powerful and release great amounts of energy mostly in the form of latent heat released by the condensation of water in cloud formation. In fact the energy released by a single, strong hurricane can be greater than the total annual energy consumption of the United States and Canada combined.
The hurricane season in the North Atlantic Ocean officially runs from June 1 through November 30, although tropical storms in the North Atlantic sometimes develop outside of this period. Each year a new list of names is used for the storms that reach tropical storm strength. The first storm is given a name that begins with 'A', the second begins with 'B', and so forth. Not all letters are used. Each year a list of 21 names is used to name the storms in the order that they form List of Tropical Storm names for the North Atlantic Ocean.
I started collecting my data October 27, and ended December 1, When I completed my data collection I converted my wind velocity from measurements of rotations per minute to miles per hour and then compared the wind velocity and barometric pressure on a scatter-plot.
I found that my hypothesis was correct that as barometric pressure increase wind velocity decreases. The correlation was The wind velocity decreased as the barometric pressure increased on my scatter-plot.
This answered the problem because the relationship the correlation between barometric pressure and wind velocity is that as the pressure rises the wind velocity falls.
This was the same as what my background information stated. My background information stated that wind velocity rises as barometric pressure falls. This is caused by rising air currents in the center of a low pressure system.
Windy Weather II: The Correlation Between Barometric Pressure and Wind Velocity
Since the upper atmosphere currents move faster than the low atmosphere, the rising air currents in the low pressure system move faster than the sinking air currents in a high pressure system.
This causes winds speeds in low pressure systems to be faster than in high pressure systems. I found this information on the web-page http: The data supports that barometric pressure and wind velocities are related. On my graph the highest of the wind speeds showed a negative correlation between barometric pressure and wind velocity because as the wind velocities decreased the barometric pressure increased.
What is the relationship between temperature, air pressure, wind and moisture?
The wind speeds varied from 0 to 45 miles per hour with many outliers and the barometric pressure varied from My highest wind velocities give support that as the barometric pressure increases the wind velocities fall in an almost straight diagonal line on my scatter plot. This shows a negative correlation. My conclusion is very accurate because I have a great amount of data. I had much more than I needed to find the relationship between barometric pressure and wind velocity.
I think I could have taken more data and still have had the same relationship between the two variables. Knowing that high winds come with lower pressure systems is important because you can predict if a storm is coming. For one more example, tornadoes occur in low pressure zones.
One example is a microburst which occurs within an individual thunderstorm. A microburst is a vertical pressure gradient caused by existing dry air beneath or entering the thunderstorm. Rain evaporates in this dry air causing cooling. Cool air is denser, thus creating higher-pressure air that plunges to the surface. Sciencing Video Vault Geographic Scale The high to low force that causes wind and its' velocity works on synoptic scales such as those depiction on conventional surface maps.
Gradients can also occur on scales much smaller than the high and low systems associated with middle latitude thunderstorms. Cool air is denser, thus creating higher pressure air that plunges to the surface.