AFTAfterAfterbayIn hydrologic terms, the tail race of a hydroelectric power plant at the outlet of the turbines. The term may be applied to a short stretch of stream or conduit, or to a pond or reservoir.AFTNAfternoonAFTRafterDowndraft(Abbrev. DWNDFT) - A small-scale column of air that rapidly sinks toward the ground, usually accompanied by precipitation as in a shower or thunderstorm. A downburst is the result of a strong
downdraft.Forward Flank DowndraftThe main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is.
Ground Water OverdraftPumpage of ground water in excess of safe yield.Marine Small Craft Thunderstorm AdvisoryA marine warning issued by Environment Canada
Atmospheric Environment Branch when the possibility of thunderstorms is greater than 40
percent.Marine Small Craft Wind WarningA marine warning issued by Environment Canada
Atmospheric Environment Branch for winds which are forecasted to be in the 20-33 knot range
inclusive.Rear Flank DowndraftA region of dry air subsiding on the back side of, and wrapping around, a mesocyclone. It often is visible as a clear slot wrapping around the wall cloud. Scattered large precipitation particles (rain and hail) at the interface between the clear slot and wall cloud may show up on radar as a hook or pendant; thus the presence of a hook or pendant may indicate the presence of an RFD.Small CraftThere is no precise definition for small craft. Any vessel that may be adversely affected by Small Craft Advisory criteria should be considered a small craft. Other considerations include the experience of the vessel operator, and the type, overall size, and sea worthiness of the vessel. See Small Craft Advisory.Small Craft Advisory(SCA) - An advisory issued by coastal and Great Lakes Weather Forecast Offices (WFO) for areas included in the Coastal Waters Forecast or Nearshore Marine Forecast (NSH) products. Thresholds governing the issuance of small craft advisories are specific to geographic areas. A Small Craft Advisory may also be issued when sea or lake ice exists that could be hazardous to small boats. There is no precise definition of a small craft. Any vessel that may be adversely affected by Small Craft Advisory criteria should be considered a small craft. Other considerations include the experience of the vessel operator, and the type, overall size, and sea worthiness of the vessel.
Exact thresholds may be found in NWSI 10-303:https://www.nws.noaa.gov/directives/sym/pd01003003curr.pdf.
For a list of NWS Weather Offices by Region, refer to the following website: http://www.nws.noaa.gov/organization.php Small Craft Should Exercise CautionPrecautionary statement issued to alert mariners with small, weather sensitive boats. Sustained OverdraftIn hydrologic terms, long-term withdrawal from the aquifer of more water than is being recharged.Tilted UpdraftA thunderstorm updraft which is not purely vertical but instead exhibits a slanted or tilted character. It is a sign of vertical wind shear, a favorable condition for severe storm development.UpdraftA small-scale current of rising air. If the air is sufficiently moist, then the moisture condenses to become a cumulus cloud or an individual tower of a towering cumulus or Cb.
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