A flood watch is in effect for the Lehigh Valley due to a coastal storm.
According to the National Weather Service, the heaviest rain will focus around Sunday night, then taper off on Monday.
The National Weather Service says to be prepared for localized urban and small-stream flooding around Sunday night, possibly early Monday.
The National Weather Service also said, "Given the recent heavy rainfall, at least 'minor' river flooding will be more likely in portions of our area than with the last system, unless the current forecast rainfall lowers substantially".
Residents along the immediate coast will also want to prepare for more substantial coastal flooding than the last storm. Sunday night's high tide in particular.
Widespread minor coastal flooding is anticipated (localized moderate flooding around Delaware Bay), according to the NWS.
Flood Watch
National Weather Service Mount Holly NJ
253 PM EST Sat Dec 16 2023
DEZ001>004-MDZ012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-
060>062-070-071-101>106-170930-
/O.CON.KPHI.FA.A.0011.231217T2300Z-231218T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-
Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Southeastern Burlington-Carbon-Monroe-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Jackson, Washington, Newton, Bethlehem,
Media, Pottstown, Centreville, Honey Brook, Lansdale, Chalfont,
Chestertown, Millville, Pennsville, Perkasie, Ocean City,
Philadelphia, Cape May Court House, Flemington, Glassboro,
Morrisville, New Brunswick, Rehoboth Beach, Sandy Hook, Dover,
Wilmington, Trenton, Stroudsburg, Allentown, Somerville,
Morristown, Mount Holly, Norristown, Collegeville, Freehold, Jim
Thorpe, Camden, Reading, Hammonton, Long Beach Island, Easton,
Oxford, Georgetown, Cherry Hill, Moorestown, West Chester,
Atlantic City, Kennett Square, Denton, Doylestown, and Wharton
State Forest
253 PM EST Sat Dec 16 2023
...FLOOD WATCH REMAINS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
AFTERNOON...
* WHAT...Flooding caused by excessive rainfall continues to be
possible.
* WHERE...Portions of Delaware, including the following areas,
Delaware Beaches, Inland Sussex, Kent, and New Castle. Portions of
northeast Maryland, including the following areas, Caroline, Kent
MD, Queen Annes, and Talbot. Portions of New Jersey, including the
following areas, Atlantic, Atlantic Coastal Cape May, Camden, Cape
May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern
Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris,
Northwestern Burlington, Ocean, Salem, Somerset, Southeastern
Burlington, Sussex, Warren, and Western Monmouth. Portions of
Pennsylvania, including the following areas, Berks, Carbon,
Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower
Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western
Chester, and Western Montgomery.
* WHEN...From Sunday evening through Monday afternoon.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Creeks and streams may rise out of their banks. Flooding may occur
in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Rainfall totals of 1.5 to 3.0 inches are forecast across the
watch area Sunday into Monday, with the heaviest falling
overnight Sunday night. The ground is more saturated due to
heavier rain over the last couple of weeks. A period of
higher hourly rainfall rates will be possible later Sunday
night into early Monday morning, and this can locally enhance
the flooding especially in some urban areas.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.