Weather Word of the Day | weatherology°

Weather Word of the Day

October 15, 2019

Advection Fog - Advection fog often looks like radiation fog and is also the result of condensation. However, the condensation in this case is caused not by a reduction in surface temperature, but rather by the horizontal movement of warm moist air over a cold surface. This is very common during the winter when warm moist winds blow over cold snowcover. Advection fog may also form when moist maritime air masses drift over a cold inland area. This usually happens at night when the temperature of the land drops due to radiational cooling.

October 14, 2019

Isobars - Isobars are lines on a weather map joining points that have the same air pressure at a given altitude. Isobars are typically drawn in for surface plots. When isobars are tightly packed, windy conditions can be expected.

October 13, 2019

Blue Jet - An upper-level atmospheric electrical discharge, usually blue or bluish-white in color, that occur high above thunderstorms. Similar to sprites. This phenomenon is believed to connect the tops of thunderstorms with the ionosphere.

October 12, 2019

Perihelion - The point on the annual orbit of a body (about the sun) that is closest to the sun; at present, the earth reaches this point on about 5 January. Opposite of aphelion.

October 11, 2019

Transpiration - Process by which water vapors escapes from plants through leaf pores

October 10, 2019

Back-building Thunderstorm - A thunderstorm in which new development takes place on the upwind side of the storm. Upwind refers to the west or southwest side of the storm. In situations where back-building storms occur, the storm can seem to remain stationary or even move backwards against the mean wind flow. Meteorologists often call these types of storms training thunderstorms.

October 9, 2019

Solstice - Time of year when sun is at its maximum poleward location