Area forecast discussion 
National Weather Service Mount Holly New Jersey 
952 PM EDT Monday may 30 2016 


Synopsis... 
tropical moisture remained over eastern New Jersey and the Delmarva 
Monday afternoon. This moisture will shift off the coast this 
evening as a cold front approaches from the west. The cold front 
will track through the region late Monday night into early Tuesday. 
High pressure will follow for the middle of the week. A cold front, 
attached to low pressure moving across eastern Canada, will slide 
across the mid Atlantic region on Friday or Saturday. The remainder 
of the forecast period looks to be unsettled due to another 
approaching low pressure system. 


&& 


Near term /until 6 am Tuesday morning/... 
not many changes with the 930 PM update. The band of showers that 
has been over the shore all day is finally starting to full shift 
off shore. A few showers have developed behind the main band 
across south NJ, but those should be mostly light and likely won't 
last much past midnight. An additional line of showers and 
thunderstorms was over the western half of the region, just ahead 
of the cold front. This line is starting to fall apart as the 
cooler outflow takes over. Thus, we should see decreasing chances 
for rain through the overnight hours. Pops were adjusted to match 
current radar trends. Otherwise no major changes with this 
update. 


The cold front is still on track to slowly slide east over the 
region through the overnight hours. 


Despite lower dew points behind the front, fog should develop 
across most areas tonight given the very wet ground. However, 
given the drier air moving in, do not expect widespread dense fog 
on land. Low tonight...mild with mid/upper 60s in most areas. 


&& 


Short term /6 am Tuesday morning through 6 PM Tuesday/... 
weak high pressure will arrive across the area Tuesday. Skies will 
be mostly sunny across most of the region with some cloudiness 
across the Delmarva and extreme srn New Jersey. We will continue with slgt 
chance or low chance pops across these areas...since some of the 
low level moisture from mondays system will not yet have exited 
these areas. It will be a warm day with highs in the low/mid 80s 
across the region. 


&& 


Long term /Tuesday night through Monday/... 
overview...the period starts with a cold front exiting stage right 
in the Atlantic, with another weak cold front well to our north 
situated west to east from the Great Lakes east to Maine. This front 
will eventually lift north away from the region as surface high 
pressure and mid-level ridging builds in. High pressure will be the 
main story Wednesday through at least Thursday, maybe into Friday. A 
cold front is forecast to cross the area on Friday or Saturday. For 
the remainder of the weekend and into early next week, a deep trough 
is forecast to settle over the east as strong ridging develops over 
The Rockies. 


Temperatures...for reference, normals for phl are in the upper 70s 
and upper 50s. For the period, temperatures will be near or above 
normal. Depending on how deep and fast the East Coast trof becomes 
established, the end of the period could transition into the below 
normal range. 


Precipitation...small pop showers have been been painted in the 
grids for Tuesday night across the southern zones. Currently, dry 
conditions are expected Wednesday into Thursday, but keep an eye 
open over the ocean to see if any stratus and/or fog develops and 
gets pushed onshore. Scattered thunderstorms are expected late in 
the week with the cold front. Then the mid-level trof is forecast to 
take over and provide the region with unsettled weather. 


Winds...winds will become northeast Tuesday night and go east on 
Wednesday and then southeast before the frontal passage. Winds will 
go northwest behind the late week cold front, then southwest as the 
trof settles in. It could be a bit gusty on Wednesday and Thursday, 
especially near the coast. 


Impacts...the probability for widespread hazardous weather is low. 


&& 


Aviation /02z Tuesday through Saturday/... 
the following discussion is for kphl, kpne, kttn, kabe, krdg, kilg, 
kmiv, kacy and surrounding areas. 


Many taf sites will start this evening VFR, but expect areas of 
fog to develop across much of the region, reducing visibilities to 
at least MVFR and possibly IFR (especially for locations that have 
seen heavy rain over the last 24 hours such as kilg, kphl, and 
kpne). The fog should continue through much of the night. 
Visibilities should begin to improve between 10 and 15z. 


Winds will be southerly or southwesterly to begin the taf period, 
shifting to northwesterly by 12z as a cold front moves through the 
region. However, wind speeds through out the taf period should be 
near or below 10kt. There is a chance that a sea breeze could 
develop tomorrow afternoon, shifting the winds at kacy and 
possibly kmiv to southeasterly. 


Outlook... 
Tuesday night through Thursday...mainly VFR. Few showers psbl far 
south Tuesday night. 


Thursday through Saturday...mainly VFR, except MVFR conditions in 
scattered showers and thunderstorms. 


&& 


Marine... 
the only significant hazard for the waters continues to the the 
areas of dense fog. The dense fog advisory continues over night 
for the coastal waters and the lower Delaware Bay. The moisture 
enriched atmosphere and the chilly sea temps will provide the 
favorable conditions for this sea fog. Conditions will improve 
Tuesday once a cold front crosses the waters and drier air 
arrives. Winds and seas should remain sub-sca thru the period. 
Showers are expected tonight decreasing in coverage late. 


Outlook... 
Tue night through Saturday...sub-Small Craft Advisory conditions 
expected through the period, although a persistent and solid 3 to 4 
sea on the ocean seems likely through much of the period. East winds 
could get gusty on Wednesday and Thursday. Isolated showers are 
possible across the southern waters on Tuesday night. No precip 
expected Wednesday into Thursday. Scattered showers and 
thunderstorms are possible Friday and Saturday. 


&& 


Hydrology... 
most of the heaviest rain has ended, however we continue to 
monitor for Hydro concerns as even moderate rain over the areas 
that had the heaviest rain earlier today could cause flooding 
primarily in poor drainage areas. However, with the cold front 
entering the western portions of our region, the flooding threat 
will be decreasing through the overnight hours. 


&& 


Phi watches/warnings/advisories... 
PA...none. 
New Jersey...none. 
Delaware...none. 
Maryland...none. 
Marine...dense fog advisory until 6 am EDT Tuesday for anz431-450>455. 


&& 


$$ 
Synopsis...kruzdlo 
near term...Johnson/O'Hara 
short term...O'Hara 
long term...drag/kruzdlo/O'Hara 
aviation...Johnson/kruzdlo/O'Hara 
marine...Johnson/kruzdlo/O'Hara 
hydrology...Johnson 






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