The 0 C isotherm should be forecast according to the roles set forth in the section treating this particular phase. The moisture lines may be advected with the winds. The 0 C isotherm should also be moved with rules stated previously in this chapter. The area of maximum snowfall can be forecast for 12 hours with considerable accuracy, and for 24 hours with fair accuracy, provided a reasonable amount of care is exercised according to rules and subjective ideas mentioned previously. Analyze synoptic features in determining temperature forecasts.
Temperature ranks among the most important forecast elements.
Temperatures are not only important in the planning and execution of operational exercises, but also are of keen interest to all of us in everyday life. Many factors are involved in the forecasting of temperatures. These factors include air mass characteristics, frontal positions and movement, amount and type of cloudiness, season, nature and position of pressure systems, and local conditions. Temperature, which is subject to marked changes from day to night, is not considered a conservative property of an air mass. Too, it does not always have a uniform lapse rate from the surface up through the atmosphere.