DISCUSSION: As the upcoming Nor'easter begins to gradually develop in the vicinity of the Gulf of Mexico as well as across portions of the North-Central United States, many areas across and to the east of the New York City Metropolitan area are already under a Blizzard Watches or Winter Storm Warnings. It is worth noting that as the current forecast situation comes into better view through the course of the morning to afternoon hours tomorrow, many of these areas currently placed under Blizzard Watches will likely be upgraded to Blizzard Warnings. This is a consequence of the formal definition (and associated criteria) for a Blizzard Warning.
A Blizzard Warning means that the following conditions are occurring or expected within the next 12 to 18 hours.
1) Snow and/or blowing snow reducing visibility to 1/4 mile or less for 3 hours or longer
2) Sustained winds of 35 mph or greater or frequent gusts to 35 mph or greater.
There is no temperature requirement that must be met to achieve blizzard conditions.
Thus, the combination of projected strong winds along with falling and/or blowing snow which is expected across many of the areas currently placed under a Blizzard Watch indicates that these areas will be shifted into Blizzard Warnings. This is because of the fact that by tomorrow early/mid-afternoon, that will be within 12 to 18 hours of the expected period of blizzard conditions.
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©2017 Meteorologist Jordan Rabinowitz