The nighttime images showed high and significant correlations with ground level air temperatures for an average 13-h period surrounding the image time 10.42pm, from 6 pm to 4 8 am the next day.
These indices are unitless indicators of fire potential that are calculated based on the daily noon observation of fire weather, namely the screen-level air temperature and relative humidity, 10-m open wind speed, and 24-h accumulated precipitation collected at solar noon (in Canada this observation time is standardized at 1300 h local Daylight Savings Time).
Parameters measured include: subjects' height, weight, and age, oxygen and carbon dioxide levels, air temperature, heart rate, arterial oxygen saturation, and Borg Ratio Scale value on breathing exertion.
When the sky is overcast, low-level air temperatures vary much less between day and night, and turbulence remains nearly constant.
Upper-level air temperatures were generally warm, and a minimal anticyclone was situated over the Gulf.
Atmospheric concentrations of greenhouse gases such as CO2, CH4, and N2O have increased dramatically since the beginning of the industrial revolution due to fossil fuel combustion, deforestation and land development; together, these probably led to a rise in ground-level air temperatures at an unprecedented rate over the past three decades [ 1, 2].
Sea-level pressure (hPa) (geopotential height (m) at the 500 hPa pressure level) and air temperature distribution (°C).
At the 500 hPa level, the air temperature averages −7 °C (18 °F) within the tropics, but air in the tropics is normally dry at this level, giving the air room to wet-bulb, or cool as it moistens, to a more favorable temperature that can then support convection.
Thanks to this setup, dew formation conditions such as relative humidity level and air temperature can be chosen and studied.
