Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
504 PM EDT Thu Jul 09 2020
Day 2
Valid 12Z Fri Jul 10 2020 - 12Z Sat Jul 11 2020
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL FOR PORTIONS OF
THE MID ATLANTIC/NORTHEAST...
...Mid Atlantic/New England...
...20Z Update...
Pretty big QPF/ERO changes at this update as the newly formed
Tropical Storm Fay will track a bit closer to the coast and into
inland New England than was previous forecast. This then brings
the axis of heaviest rain farther inland; along and east of the
I-95 corridor across portions of DE, eastern PA, into NY and
points east. As precipitable water values of over 2.25 inches
work inland aided by easterly low level flow with the track
orienting NNE over the period, expect efficient rain rates and
training (as the propagation vectors and mean wind align) not only
across much of Delaware, eastern PA (Poconos), NJ and into update
NY associated with northern quadrants but with thunderstorms
moving across Long Island and points north into CT/RI and MA.
Areal average precipitation is around 1-3+ inches with locally
higher amounts possible. Given much of this region has received
an abundance of rain over the past several days, especially
eastern PA/NJ and update NY, feel soils are sensitive to
additional rainfall. Therefore, a Slight Risk was introduced
based on the latest QPF/model trends. A Moderate Risk may be
needed, especially for the urban sector, if the QPF continues to
highlight this region and trend upward.
https://www.wpc.ncep.noaa.gov/qpf/ero.php?opt=curr&day=2