Wind Speeds Ebooks Catalog
Wind Speed MPH To use this table, which illustrates the intensely chilling effect of wind, find wind speed (in miles per hour) in left-hand column and temperature (in degrees F) in top row the intersection of these is the equivalent temperature. For example, at a temperature of 0 F a breeze 15 mph has the cooling effect of a temperature of -36 on a calm day and precautions should be taken to protect exposed flesh from frostbite. The zones shown on the table indicate the danger of frostbite to any exposed flesh of an average person in good condition whose body is properly clothed for the conditions. When the effective temperature is -25 F or less, care should be taken to minimize exposure of bare skin to wind.
Low cloud cover at higher elevations may neutralize the effectiveness of OPs established on peaks or mountaintops. High wind speeds and sound often mask the noises of troop movement. Several OPs may need to be established laterally, in depth, and at varying altitudes to provide visual coverage of the battle area.
Cold injuries may be divided into two types freezing and nonfreezing. The freezing type is known as frostbite. The nonfreezing type includes hypothermia, dehydration, and immersion foot. Cold injuries result from impaired circulation and the action of ice formation and cold upon the tissues of the body. Temperature alone is not a reliable guide as to whether a cold injury can occur. Low temperatures are needed for cold injuries to occur, but freezing temperatures are not. Wind speed can accelerate body heat loss under both wet and cold conditions. All commanders and subordinate leaders instructors must be familiar with and carry GTA 5-8-12, which includes a wind chill equivalent temperature chart (Figure 2-1, page 2-12).
Assess wind speed in knots. (2) If no anemometer is available, estimate the speed in knots. Judge the wind speed by the way objects, such as trees, bushes, tents, and so forth, are blowing. Marked wind direction shifts. A high pressure system wind flows clockwise. A low pressure system wind flows counterclockwise. The closer the isometric lines are, the greater the differential of pressure (greater wind speeds). Marked wind speed increases. Decreasing wind speeds.
The most important factors governing a helicopter's ability to evacuate are visibility, wind velocity and turbulence, and air density. In mountain flight, continual visual contact with the ground is essential, so a helicopter can't operate in poor weather. It can maneuver safely in winds up to about 35 miles per hour, with a wind of about 10 miles per hour being better than still air. A dangerous turbulence usually accompanies high wind. The altitude to which a helicopter can fly depends on air density, which decreases as either altitude or temperature increases. Thinner air reduces the lifting force of the rotor blades.
Renewable Energy 101
Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.