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Tropical storm warning TRW – Tropical storm conditions (gale- and storm-force sustained winds of 34 to 63 knots [39 to 72 mph; 63 to 117 km/h]) are expected within the specified coastal or inland area within 36 hours (24 hours for Guam, as locally defined by the NWS Forecast Office in Barrigada) in advance of the forecast onset of tropical ...
Aviation Area Forecast (FA or ARFOR) Also simply called an area forecast. A former message product of the U.S. National Weather Service issued to provide information to pilots and aviation routes about weather conditions across a large regional area within the United States. FAs were issued three times daily, valid for 18 hours, and covered an ...
Watches are issued 36 hours prior to a tropical cyclone making landfall. Warnings are issued 24 hours prior to the tropical cyclone making landfall. If sustained winds 70 km/h and/or gusts 90 km/h or stronger are predicted, a conventional wind warning will be issued along with the tropical cyclone watches and warnings.
TAFs are issued at least four times a day, every six hours, for major civil airfields: 0000, 0600, 1200 and 1800 UTC, [4] and generally apply to a 24- or 30-hour period, and an area within approximately five statute miles (8.0 km) (or 5 nautical miles (9.3 km) in Canada) from the center of an airport runway complex. TAFs are issued every three ...
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In 1991, advisory timing shifted back to every six hours starting at 03:30 UTC every day. [41] In 1992, advisory timing changed to every six hours starting at 03:00 UTC each day. [42] The length of time used for watches and warnings changed again in 2010, with watches using a 48‑hour time frame and warnings using a 36-hour time frame. [43]
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The forecasting of the weather for the following six hours is often referred to as nowcasting. [70] In this time range it is possible to forecast smaller features such as individual showers and thunderstorms with reasonable accuracy, as well as other features too small to be resolved by a computer model.