There is only one region within the Northeast. How this region is made and how we define the 14-day extreme precipitation periods can be found in ************

Key Information:

  • There are 43 precipitation periods in the Northeast from 1918 to 2018.
  • The typical wet season for the Northeast occurs from May to October.
  • Northeast precipitation periods occur throughout the year with a maximum during the dry season in December and January.
  • Typical storm reports during Northeast periods include Flood, Winter Storm, Flash Flood and Heavy Snow.

When do Northeast Extreme Periods occur?

Seen to the left, 14-Day periods within both Northeast regions are counted, based on month, from 1915 to 2018.

The typical wet season of the Northeast is from May to October. Yet, 14 day precipitation periods can happen throughout the year. The maximum of 14-day periods occurs during the dry season, during DJF (winter).

What are typical storm reports of Northeast Extreme Periods?

Using NCEI storm reports typical impacts of our 14-day extreme periods, past 1996, can be estimated. Beginning in 1996, 48 event types were recorded into the storm events database. Every report was recorded based on the county of occurrence by a National Weather Service forecast office (WFO) and then passed onto NCEI. Therefore, reports within 14-day extreme periods from 1996-2018 within Northeast states included in the region are counted as Northeast 14-day extreme periods reports. Definitions of all storm reports can be found within the NWSI, Appendix A.

The average number of storm reports during a wet season or a dry season extreme period, within the Northeast, from 1996 to 2018 are seen to the right. “Flood”, “Flash Flood” and “Winter Storm” are the most frequent reports seen during periods.

Wet and dry season 14-day extreme periods have similar averages of storm reports, but very differing type of reports. Common reports during a wet season period are “Flood”, average of 183 and “Flash Flood”, average of 165. Common reports during a dry season period are “Winter Storm”, average of 163, “Winter Weather”, average of 111, and “Flood”, average of 101. Therefore, wet season events have more convective style reports, while dry season events have more frozen precipitation.