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Philadelphia Office of Emergency Management
Wednesday May 16th, 2018 :: 03:42 p.m. EDT


Flood Watch

Flood Watch from Thursday Evening until Late Friday Night. Be prepared to take action in the event that flooding develops.

* Periods of light to moderate rain will continue this afternoon 
  through tomorrow. A brief break in the rain is expected early 
  tomorrow evening before it once again intensifies and becomes more 
  widespread tomorrow night. Periods of moderate to heavy rain are 
  then expected to persist into at least Friday, possibly into the 
  weekend. General rainfall amounts of 2 to 4 inches are expected 
  the next 72 hours with the highest totals along and south of the 
  Interstate 78 corridor. Locally higher amounts are possible across 
  the same area as thunderstorms are expected to periodically 

* A variety of flooding types are all possible within the Flood
  Watch area. First, low-lying and poor drainage flooding is the
  most likely type of flooding to develop. Second, flash flooding
  will be possible under the stronger thunderstorms. Flash
  flooding occurs quicker than other types flooding due to the
  torrential rain thunderstorms can produce in a short amount of
  time. Flash flooding is most likely to occur across urban areas
  where rainfall runoff is maximized and where small creeks and
  streams respond quickly. The rain has to go somewhere and
  eventually leads to larger streams and rivers. This is where the
  third type of flooding is possible. If you live across the 
  Passaic, Raritan, and Rancocas basins in New Jersey or the 
  Neshaminy, Schuylkill, and Brandywine basins across Pennsylvania
  and Delaware, keep an eye on later forecasts. These forecasts, 
  as well as all of our hydrologic forecasts, can be accessed via 
  our advanced hydrologic prediction service website.

For additional updates and weather information, visit  
For all current NWS Watches, Warnings, or Advisories, visit
For further information on emergency preparedness, visit

Philadelphia Office of Emergency Management
240 Spring Garden St
Philadelphia, PA 19123

Emergency: 9-1-1

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