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A Short-Term Forecast NOW (alt., NOWcast) is an event-driven narrative outlook of near-term weather conditions within the Weather Forecast Office’s area of responsibility, typically valid for a three- to seven-hour period. The product outlines any ongoing or recently occurring conditions—based on radar analysis, satellite imagery and other ...
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
Local Weather Forecast Offices (WFO) of the National Weather Service may issue a Special Weather Statement to alert of a specified hazard that is approaching or below warning or advisory criteria, that does not have a specific alert product code of their own (such as for widespread funnel clouds with limited to no threat of complete tornadogenesis, the likelihood of landspouts, or strong ...
Special Weather Statements are free form statements that are typically used to describe weather hazards that cannot be described by another watch, warning, or advisory; is not hazardous enough to warrant issuing a watch or warning; or to warn the public of a potentially hazardous weather event in the long term forecast.
A meteorologist is a scientist who studies and works in the field of meteorology aiming to understand or predict Earth's atmospheric phenomena including the weather. [1] Those who study meteorological phenomena are meteorologists in research, while those using mathematical models and knowledge to prepare daily weather forecasts are called weather forecasters or operational meteorologists.
The rates of change predict the state of the atmosphere a short time into the future. The equations are then applied to this new atmospheric state to find new rates of change, which predict the atmosphere at a yet further time into the future. This time stepping procedure is continually repeated until the solution reaches the desired forecast time.
PDS tornado warnings are currently issued on an experimental basis by the 38 National Weather Service Weather Forecast Offices within the Central Region. [17] The criteria for a PDS warning are when a tornado on the ground has been spotted or confirmed, or a significant tornado is expected based on radar signatures.
A thesaurus or synonym dictionary lists similar or related words; these are often, but not always, synonyms. [15] The word poecilonym is a rare synonym of the word synonym. It is not entered in most major dictionaries and is a curiosity or piece of trivia for being an autological word because of its meta quality as a synonym of synonym.