Heat flux Amount of heat, transferred in a liquid, in particular in the atmosphere, per unit of time through a unit area.
**Heat Index**
The heat index is the combination of the temperature and the relative humidity. When combing these two the result is how hot the air feels.
Following is a table which can be used to calculate the heat index.
heat"1. (Or heat content.) A form of energy transferred between systems, existing only in the process of transfer. 2. Same as enthalpy. Heat, used as a noun, is confusing and controversial in its scientific meaning.
Heat stress and dehydration
In the hotter parts of Australia, dehydration and heat stress can be a risk, particularly for unacclimatised people. Full acclimatisation generally requires about ten days of exercise in hot conditions.
HEAT BALANCE
The equilibrium which exists on the average between the radiation received by the earth and atmosphere from the sun and that emitted by the earth and atmosphere.
Heat Index: The Heat Index (HI) or the "Apparent Temperature" is an accurate measure of how hot it really feels when the Relative Humidity (RH) is added to the actual air temperature.
Heat low
A shallow low pressure system caused by the strong heating of the earth's surface. These lows are usually weak and are strongest in the late afternoon. They can trigger afternoon or evening showers and thunderstorms.
Heat wave ...
Heat - a form of energy transferred between objects or systems as a result of a difference in temperature; not the same as temperature ...
Heat Index Apparent Temperature: More commonly known as the Heat Index, the Heat Index Apparent Temperature is the accepted measure of thermal discomfort in the United States.
Heat Advisory
Issued within 12 hours of the onset of the following conditions: heat index of at least 105?Ǭ?F but less than 115?Ǭ?F for less than 3 hours per day, or nighttime lows above 80?Ǭ?F for 2 consecutive days.
Heat Exhaustion ...
Heat Advisory- Issued when heat index is expected to reach at least 100F but less than 105F, or when nighttime lows are expected to remain above 80F.
HEAT INDEX: An index that combines air temperature and humidity to give an apparent temperature (eg. how hot it "feels"). Here is a heat index formula originally from Weatherwise magazine. It gives valid results above 70 deg. F. (-42.379+2.
Heat: A form of energy transferred between systems because of the temperature differences between them.
Heat advection: The transfer of energy through the horizontal movements of the air.
Heat Index: temperature that describes how hot it feels taking into account high air temperatures and high humidity levels.
HEAT INDEX - The HI is the temperature the body feels when the heat and humidity are combined.
HEAT LOW - The thermal induced surface low pressure trough that develops during the warm season in the lee of the Cascades.
Heat Capacity Is the ratio of the amount of heat energy absorbed by a substance compared to its corresponding temperature rise.
Heat Budget - The balance of incoming and outgoing radiation.
Heating Degree - Day Each degree of temperature of the daily mean below 65°F is counted as one heating degree- day.
Heat Stress Index
A four-step index, based on the Temperature-Humidity Index or "Humuture" Index expressing the likelihood of heat stroke, sunstroke, or other acute symptoms of bodily stress.
Heat The total kinetic energy of the atoms or molecules composing a substance.
Heat equator The latitude (about 10 degrees N) of highest mean annual surface air temperature.
Heat Index The National Weather Service provides public advisories and warnings when the combination of temperature and humidity becomes high enough to pose a health risk.
Heat Capacity Mapping Mission (HCMM) A two-channel radiometer launched by NASA to measure the thermal properties of the terrestrial surface. It had an application to identify and locate rocks and minerals.
Urban Heat Island The increased air temperatures in urban areas in contrast to cooler surrounding rural areas.
latent heat of freezing-latent heat of melting
water molecules absorb 80 calories per gram to change from the solid (ice) to the liquid (water) state at 0 °C ...
LATENT HEAT The energy released or absorbed during a change of state. Related terms: condensation and sublimation ...
Latent heat - The heat either released or absorbed as a result of a change of state.
LCL - Lifting Condensation Level. The level at which lifted air will saturate.
Latent heat - heat given off by condensation, or absorbed by evaporation, of water.
Lightning - a giant electrical spark jumping between clouds or between a cloud and the ground.
Latent Heat- the heat energy that must be absorbed when a substance changes from solid to liquid and liquid to gas, and which is released when a gas condenses and a liquid solidifies.
latent heat—The amount of heat absorbed (converted to kinetic energy) during the processes of change of liquid water to water vapor, ice to water vapor, or ice to liquid water; or the amount released during the reverse processes.
Heat- The energy transferred from a hotter object to a cooler one
Humidity- A measure of the amount of water vapor in the air.
Hurricane- A tropical storm that has winds of 119 kilometers per hour or higher; typically about 600 kilometers across.
HEAT ADVISORY: Issued when the Heat Index is expected to exceed 105 during the day and 80 during the night for at least two consecutive days.
Heat Index- This index is a measure of the contribution that high humidity makes with abnormally high temperatures in reducing the body's ability to cool itself.
Heat Lightning- Lightning that can be seen, but is too far away to be heard.
Heat exhaustion: a mild form of heat stroke, characterized by faintness, dizziness, and heavy sweating.
Heat Index - It's the ‘feel like' temperature on a hot day. The heat index is a number that expresses the warming effect of humidity at different temperatures. Only air temperature and relative humidity are used in the calculation of heat index.
Heat/Sunstroke HIGHLY LIKELY with continued exposure
III
Very Hot
105°F - 130°F ...
Heat Stroke or Sunstroke imminent
Approaching Severe Levels: A thunderstorm which contains winds of 35 to 49 knots (40 to 57 mph), or hail 1/2 inch or larger but less than 3/4 inch in diameter. See Severe Thunderstorm.
Heat Island - A dome of elevated temperatures over an urban area caused by the heat absorbed by structures and pavement.
Heat Lightning - Lightning that can be seen, but is too far away for the thunder to be heard.
Heat capacity(6)
The ratio of the heat absorbed (or released) by a system to the corresponding temperature rise (or fall).
Heat index ((HI))(6) ...
HEAT ENERGY - Stored kinetic energy of any matter as a function of temperature. In water, heat energy is stored as one calorie per gram of water for each degree (Celsius).
The heat absorbed or released by a substance that undergoes a change of phase i.e. ice to water and water to water vapour or vice versa.
Layer Cloud
Clouds that form in sheets or layers often associated with weather fronts.
Latent heat is simply heat released or absorbed by a substance (in this case, water vapor) as it changes its state. When water vapor condenses into liquid, it releases this heat into the surrounding atmosphere.
specific heat capacity
1.84 kJ/(kg·K)
Water vapor or water vapour, also aqueous vapour, is the gas phase of water. On the Earth, water vapor is one state of the water cycle within the hydrosphere.
Excessive Heat Outlook - This CPC product, a combination of temperature and humidity over a certain number of days, ...
latent heatThe heat that is either released or absorbed by a unit mass of a substance when it undergoes a change of state (e.g., during evaporation, condensation, or sublimation).
latent heat Energy transferred from the earth's surface to the atmosphere through the evaporation and condensation processes.
ConvectionThe transfer of heat within the air by its movement. The term is used specifically to describe vertical transport of heat and moisture, especially by updrafts and downdrafts in an unstable atmosphere.
CALORIE In meteorology, it is the amount of heat required to raise the temperature of one (1) gram of water one (1) degree Celsius. It is a unit of heat energy.
Stable Boundary LayerThe stably-stratified layer that forms at the surface and grows upward, usually at night or in winter, as heat is extracted from the atmosphere's base in response to longwave radiative heat loss from the ground.
The ice is relatively transparent, as opposed to rime ice, because of large drop size, rapid accretion of liquid water, or slow dissipation of latent heat of fusion.
At night, the Earth suffers a net heat loss to space due to terrestrial cooling. This is more pronounced when you have a clear sky.
Calorie A unit of heat originally defined as the amount of heat required to raise the temperature of water through one degree centigrade (the gram-calorie or small calorie), but this proved to be insufficiently precise.
temperature during specified periods of timeADDSAviation Digital Data ServiceAdiabatA line on a thermodynamic chart relating the pressure and temperature of a substance (such as air) that is undergoing a transformation in which no heat is ...
On a windy day with overcast sky, the heat exchange between ground and air is an example of forced convection. On a sunny day with a little wind where the ground temperature rises, both kinds of convection take place. 2.
If more heat is pumped into the system (system=earth) then more water vapour will be put into the atmosphere.
Before it arrives there, it is caught up in the vortex and rises in the eye wall, releasing its latent heat to drive the upward flow.
Thermodynamics - In general, the relationships between heat and other properties (such as temperature, pressure, density, etc.) In forecast discussions, ...
Convection - The transport of heat (and moisture) by the movement of a fluid. In meteorology, the term is used most often to describe the vertical transport of heat and moisture, especially by updrafts and downdrafts in an unstable atmosphere.
Once formed, a tropical cyclone is maintained by the extraction of heat energy from the ocean at high temperature and heat export at the low temperatures of the upper troposphere.
Sea fogs are always advection fogs, because the oceans don't radiate heat in the same way as land and so never cool sufficiently to produce radiation fog.
without transfer of heat or mass) to a pressure of 1000 millibars. Theta-e, which typically is expressed in degrees Kelvin, is directly related to the amount of heat present in an air parcel. Thus, it is useful in diagnosing atmospheric instability.
The more heat energy in the air, the higher the temperature. As the surface warms in reaction to the sun's heat, it also warms the air above it. Also the degree of hotness or coldness as measured on some definite temperature scale.
 See also: Temperature, Air, Weather, Surface, Water
|
