Tonight:
Rain showers likely before 10pm, then a chance of rain between 10pm and midnight, then patchy fog. Partly cloudy, with a low around 44. North wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.

Monday:
Patchy fog before 9am. Mostly sunny, with a high near 65. Northeast wind around 6 mph.

Monday Night:
Mostly cloudy, with a low around 50. Southeast wind around 7 mph.

Tuesday:
Rain showers after 8am. Cloudy, with a high near 62. Southeast wind around 8 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Tuesday Night:
Rain showers. Mostly cloudy, with a low around 46. Southwest wind 2 to 7 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Wednesday:
A slight chance of rain showers before 8am. Mostly sunny, with a high near 59. Chance of precipitation is 20%.

Wednesday Night:
Mostly clear, with a low around 40.

Thursday:
Sunny, with a high near 64.

Extended Forecast

Thursday Night Mostly Clear	Friday Chance Rain Showers	Friday Night Chance Rain Showers	Saturday Chance Rain Showers	Saturday Night Chance Rain Showers	Sunday Chance Rain Showers
Lo 45 °F	Hi 63 °F	Lo 46 °F	Hi 58 °F	Lo 42 °F	Hi 57 °F
	PoP 30%	PoP 40%	PoP 30%	PoP 30%	PoP 30%

AREA FORECAST DISCUSSION
National Weather Service Mount Holly NJ
740 PM EDT Sun Oct 20 2019

Weather Synopsis:
A low pressure area will track offshore tonight. High pressure will build in Monday and crest over the area Tuesday morning before weakening. A cold front attached to low pressure in Canada will cross the area later Tuesday and Tuesday night. Another high will affect the weather for Wednesday and into Friday. Late during the week, another disturbance will move towards the area.

Near Term:
UNTIL 6 AM MONDAY MORNING - Wind gusts around 45 mph will be possible through late this evening along the coasts and shore lines of Cape May County New Jersey and Sussex County Delaware. Therefore, have issued a wind advisory for those locations through 11 PM. Otherwise no significant changes with the forecast at this time.

We are starting to see the back edge of the rain, though there has been some redevelopment behind the initial clearing line, so haven`t made any changes to the PoPs at this time. Rain should move out of the area overnight as the remnant low moves further off shore.

Dew point depressions are already quite low, and although we will see a wind shift to northerly overnight, significant dry air advection is not expected until late tonight at the earliest. This, combined with the wet ground and clearing skies could lead to patchy fog development. The one factor working against fog development is wind speeds, which will still be quite breezy along the coast until very late tonight. given all the factors in favor of fog, I don`t think it will be enough to completely preclude fog development, though it may limit the fog from becoming dense and/or widespread.

Because of the low dew point depressions, we are not expecting temperatures to drop off too much overnight from Sunday afternoon. Lows tonight are expected to be in the 40s and lower 50s across the region.

Short Term:
6 AM MONDAY MORNING THROUGH 6 PM MONDAY - Monday will be a brief respite from the active weather pattern as a surface high propagates directly over the region leading to tranquil and dry weather for the region. Once the fog dissipates in the morning, we should have mostly sunny conditions through the day. Thus, despite northerly low level flow, temperatures are expected to recover into the 60s for most locations, with highs near normal.

Long Term:
MONDAY NIGHT THROUGH SUNDAY - An upper air pattern featuring faster flow and more energy develops across the CONUS with a large broad trough moving into the Plains and then weakening as it slides east. A ridge tries to develop across the East coast late week before another trough deepens across the Great Lakes.

Temperatures...During the week, temperatures will not vary from normal readings by very much. Normals for the Delaware Valley this time of year feature highs in the mid 60s with lows in the upper 40s. Across the N/W areas, normals are 6 to 8 degrees cooler than the Delaware Valley normals. Friday will probably be the warmest day with highs 2 or 3 degrees above normal. The overnight period Wednesday will be cool with mid/upper 30s across the north and low/mid 40s elsewhere. More frost across the N/W areas is possible then.

Precipitation...There are two periods during the long range which will have the greatest chances for rain. First, a slow moving cold front will cross the Middle Atlantic later Tuesday and into Tuesday night. This should bring some light rains across most areas during the period. A weak low may form along the front across Delmarva. If so, this could delay the ending time somewhat. Either way Wednesday will be nice after perhaps some morning clouds.

Another system may arrive at the end of the work week and persist into Saturday. The 12Z runs of the EC and GFS differ quite a bit with the details of the system. Nonetheless, it`s possible that this could bring another opportunity for some rains across the area. The GFS shows that the low could tap into some Gulf of Mexico moisture, so the potential for a soaker exits during the first part of next weekend. Chc pops in the fcst at this point.

Click for full NWS PHI Office Area Forecast Discussion