![]() Issued for sustained winds or frequent gusts of 25 to 33 knots and/or hazardous seas with waves of 5 feet or higher. Issued for sustained winds or frequent gusts of 34 to 47 knots, not associated with a tropical system. Issued for sustained winds or frequent gusts of 48 to 63 knots, not associated with a tropical system. Issued when a non-tropical system is forecast to produce sustained winds or frequent gusts of 64 knots or greater. Marine Weather Watches, Warnings, and Advisories Issued when minor tidal flooding is forecast to occur along coastal areas. Issued when at least moderate tidal flooding is forecast to occur along coastal areas. Issued when flooding is forecast to occur, generally within the next 6 hours, but is not expected to substantially threaten life and property. Issued when widespread general flooding is forecast to occur throughout an identifiable geographic area. Issued when a river gauge is forecast to exceed a predetermined flood stage. This is usually issued based on observed heavy rainfall (measured or radar estimated) for dangerous small stream or urban flooding, but may also be issued for significant dam or levee failures that have occurred or are imminent. Issued when flash flooding is imminent, generally within the next 6 hours. A Red Flag Warning may or may not be preceded by a Fire Weather Watch. In the summer, the rainfall criteria is extended to five or more days, as well as a Keetch-Byram Drought Index above 300 which indicates at least the top three inches of the ground are sufficiently dry. Warning criteria typical for the spring and fall are winds sustained or frequently gusting above 25 mph, relative humidity less than 30%, and widespread rainfall less than 1/4 inch during the previous three or more days. Issued to indicate that the combination of dry fuels and weather conditions will support extreme fire danger and/or fire behavior, including the potential for widespread new ignitions or control problems with existing fires. Note: Watches and Warnings issued for Severe Thunderstorms, Tornadoes, and Flash Flooding have much shorter lead times, on the order of hours for Watches or even minutes for Warnings. Warnings and Advisories are issued up to 48 hours in advance with forecaster confidence of at least 80%. Advisories are issued if the weather event will lead to nuisance conditions, while Warnings are issued for significant weather events which will pose a risk to life and property. Indicates that a particular weather event is imminent or occurring. Watches are issued up to 48 hours in advance with forecaster confidence around 50%. Indicates that conditions are favorable for the particular weather event in and near the Watch area, and which may pose a risk to life and property. Indicates the potential for significant weather events up to 7 days in advance with a forecaster confidence around 30%. Important Note: The criteria listed below apply to the service area of the National Weather Service (NWS) Forecast Office in Upton, NY.Ĭlick to see NWS Eastern Region Winter Warning and Advisory Criteria General Definitions
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