Phoenix picks up first measurable rainfall in nearly 4 months. A Winter Weather Advisory is similar to significant weather advisory, but a winter weather advisory is an official product. Winter Storm Warning A Flood Warning is issued when flooding is imminent or occurring. An Extreme Wind Warning is issued for surface winds of 100 knots (115 MPH) or greater associated with non-convective, downslope, derecho (NOT associated with a tornado), or sustained hurricane winds are expected to occur within one hour. A Winter Weather Advisory for wet snow means periods of wet snow will cause primarily travel difficulties. A Freeze Watch is issued in the autumn until the end of the growing season (marked by the occurrence of first widespread freeze). A Tropical Storm Watch is issued when a tropical cyclone containing winds of 34 to 63 kt (39 to 73 mph) or higher poses a possible threat, generally within 48 hours. Also, the generic term, Winter Weather Advisory, may be used on its own, typically to indicate that, This page was last edited on 18 December 2019, at 16:21. $$ All NOAA, Definitions of Weather Watch, Warnings and Advisories. Coastal Flood Advisories are issued for coastal areas along the Tidal Potomac River and areas along the Chesapeake Bay. Sorry, the location you searched for was not found. that present a hazard, but does not meet warning criteria. The starting point for official government weather forecasts, warnings, meteorological products for forecasting the weather, and information about meteorology. Satellite Images A Winter Weather Advisory is issued by the National Weather Service of the United States when a low pressure system produces a combination of winter weather (snow, freezing rain, or sleet) that presents a hazard, but does not meet warning criteria. Each segment of the HWO will contain 3 sections: short term through Day 1, long term for Days 2-7, and spotter information. A warning is the most serious of the winter weather messages and indicates that action should be taken immediately to get ready for the storm. NWS Winter Weather Advisories are issued for accumulations of snow, freezing rain, freezing drizzle, and sleet which will cause significant inconveniences and, if caution is not exercised, could lead to life-threatening situations. Prior to the 2008-09 winter storm season, there was the Snow Advisory, specific for when snow was the only hazard expected in the advised area, the Sleet Advisory, specific for when sleet was the only hazard expected in the advised area, the Blowing Snow Advisory, specific for when blowing snow was the only hazard expected in the advised area, and the Snow and Blowing Snow Advisory, specific for when snow and blowing snow were the only hazards expected in the advised area. The snow/sleet criteria for a Winter Storm Watch for the five westernmost counties (Allegany, Mineral, Grant, Pendleton, and Highland) is higher (6 inches or more within a 12-hour period; 8 inches or more within a 24-hour period). At other times, a weather situation may develop very quickly which could mean you'll go from having no weather alert at all, and a warning issued. The normal end of the growing season is mid to late October west of the Blue Ridge and early November east of the Blue Ridge. A Tropical Storm Warning is issued when sustained winds of 34 to 63 kt (39 to 73 mph) or higher associated with a tropical cyclone are expected in 36 hours or less. Winter Weather Advisory This product is issued by the National Weather Service when a low pressure system produces a combination of winter weather (snow, freezing rain, sleet, etc.) A synoptic scale storm producing a combination of winter weather that presents a hazard, and does not meet warning criteria. 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