Foehn wind there is no precipitation, implies there must be other mechanisms. 2) Isentropic draw-down (the draw-down of warmer, drier air from aloft): When the approaching winds are insufficiently strong to propel the low-level air up and over the mountain barrier, the airflow is said to be 'blocked' by the mountain and only air higher up near mountain-top level is able to pass over and down the lee slopes as foehn winds. These higher source regions provide foehn air that becomes warmer and drier on the leeside after it is compressed with descent due to the increase in pressure towards the surface.
Weather warning [increasing] significantly, but its occurrence, location, and/or timing is still uncertain"" and a warning as ""hazardous weather or hydrologic event [that] is occurring, is imminent, or has a very high probability of occurring"" . Additionally, the NWS breaks down weather warnings and watches based upon the specific type of hazardous weather. These warnings and watches include, but are not limited to, flooding, severe local storms, tropical cyclones, and winter storms. In Canada, governmental weather warnings and watches are issued by the Environment Canada. Non-governmental alerts, not watches or warnings, such as a "rotation detected" or "tornado reported" are issued by