![]() A dam or levee failure, or water released from an ice jam is also consideredĮxpected overflow or inundation by water which causes or will cause damage and/or a threat to life Rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a predetermined flood level, beginning within a short timeframe from the onset of heavy rain. Likelihood of a tornado within the given area based on radar or actual sighting usually accompanied by conditions indicated above for "Severe Thunderstorm Warning"Įxpected inundation of some low lying and poor drainage areas, resulting in a nuisance to the public but not a threat to life and property. Thunderstorms with wind gusts ≥ 58 mph (50 kts) AND/OR hail ≥1" in diameter Sustained winds 40-73 mph (≥35 kts) for at least 1 hour OR any gusts ≥ 58 mph (≥50 kts) Sustained winds 31-39 mph (27-34 kts) for at least 1 hour OR any gusts to 46-57 mph (40-49 kts) Winter weather event having more than one predominant hazard meeting or exceeding warning criteria for at least one of the precipitation elements.īrief quick hitting white-out conditions in heavy snow and blowing snow.Wind chill index less than -35☏ for at least 3 hours with a sustained wind of at least 10 mph.½ inch or greater accretion of freezing rain in any zone.Snowfall >= 8 inches in one event (36 hrs total, but must fall within 12) for the area north of a line from Dexter to Indian Township.Snowfall >= 6 inches in one event for Bangor region and Downeast.Sustained winds or frequent gusts > 35 mph AND considerable falling and/or blowing snow frequently reducing visibility 3 hours (Blizzard conditions need to be the predominant condition over a 3 hour period).When any of the following is expected within the next 12 to 36 hours: Wind chill index between -20☏ and -34☏ for at least 3 hours with a sustained wind speed of at least 10 mph.4 inches snowfall averaged over a forecast zone in 12 hours with visibility substantially reduced over a wide area due to wind-driven snow with winds less than 35 mph.4 inches averaged over a forecast zone in 12 hours.Winter weather event having more than one predominant hazard (ie., snow and ice, snow and sleet, or snow, ice & sleet) meeting or exceeding advisory criteria for at least one of the precipitation elements, but remaining below warning criteria.Any accretion of freezing rain or freezing drizzle on road surfaces.Usually NOT issued for localized occurrences. Visibility substantially reduced over a wide area due to wind-driven snow with winds less than 35 mph.When any of the following is expected within the next 12 to 24 hours:
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