Heat Advisory 8, NWS Philadelphia/Mount Holly

489 
WWUS71 KPHI 271844
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
244 PM EDT Sun Jul 27 2025

DEZ003-MDZ019-020-280000-
/O.CON.KPHI.HT.Y.0008.000000T0000Z-250728T0000Z/
Inland Sussex-Talbot-Caroline-
Including the cities of Denton, Easton, and Georgetown
244 PM EDT Sun Jul 27 2025

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 105.

* WHERE...In Delaware, Inland Sussex County. In Maryland, Caroline 
  and Talbot Counties.

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of 
the sun, and check up on relatives and neighbors.

&&

$$

PO

389 
WWUS71 KPHI 271942
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
342 PM EDT Sun Jul 27 2025

DEZ003-MDZ019-020-272045-
/O.CAN.KPHI.HT.Y.0008.000000T0000Z-250728T0000Z/
Inland Sussex-Talbot-Caroline-
Including the cities of Denton, Easton, and Georgetown
342 PM EDT Sun Jul 27 2025

...HEAT ADVISORY IS CANCELLED...

Dangerous temperatures are no longer expected today. 

$$

PO

Area Forecast Discussion
National Weather Service Mount Holly NJ
152 AM EDT Sun Jul 27 2025

.SYNOPSIS...
A front remains situated off to our south and west with high
pressure over New England today. This front will lift back north as
a warm front on Sunday, ahead of a weak cold front that will pass
through Sunday night. High pressure returns for Monday and Tuesday,
before another cold front passes through Wednesday into Thursday.
High pressure returns for Friday into next weekend.

&&

.NEAR TERM /THROUGH TODAY/...
Earlier reductions in visibility have reduced due to Canadian
wildfire smoke has decreased as winds have turned to the
southeast ahead of showers and storms moving through our region from
the west. The chances for rains decrease for the coast of New
Jersey as well as Delmarva as some of the activity will
diminish as it moves through. PoPs range from chance/slight
chance for SE most areas to Likely for areas near and northwest
of the I-95 corridor. Lows tonight will only drop into the
low/mid 70s most spots with maybe some upper 60s for north NJ
and the southern Poconos.

The daytime hours Sunday will certainly not be the ideal
weekend day with low pressure passing well to the north and the
warm/cold front combo expected to move through. Plenty of clouds
expected and occasional showers and tstms thru the day. Likely
and categorical pops will continue in the fcst. Heavy rains are
possible with the high PWAT air across the Ohio Valley being
imported into the area. There is a Marginal risk for Severe
tstms too with gusty winds with primary threat. The clouds and
rains will keep temps from going above normal with mid/upper 80s
S/E and low 80s N/W expected for highs on Sunday.

&&

.SHORT TERM /TONIGHT THROUGH TUESDAY/...
Convection from Sunday afternoon will begin to wane into Sunday
evening with the loss of diurnal heating. The weak surface cold
front will move through from north to south, pushing off the coast
by Monday morning. Skies will clear out behind the front with lows
falling into the upper 60s to mid 70s.

Monday and Tuesday will feature dry conditions with mostly sunny
skies both days as broad high pressure builds into the region from
the south. Perhaps a spotty shower or storm is possible on Tuesday,
but not expecting anything of significance. Behind the front, there
won't be much of a push of cooler or drier air though, as
temperatures and dew points are expected to gradually increase
through the period. Highs on Monday will mainly be in the upper 80s
to low 90s with highs on Tuesday in the low to mid 90s. Dew points
will also be in the 70s both days, so it'll feel quite uncomfortable
outside once again. This will result in heat indicies around the
region in the 95-102 degree range on Monday and 100-105+ degree
range on Tuesday. Likely will need at least some sort of heat
headlines for Monday and Tuesday in the coming days.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
Little changes have been made to the long term period as Wednesday
will still feature one more hot & humid day with thunderstorm
potential, before a much more refreshing airmass moves in for the
end of the week into next weekend.

Greatest attention to the long term period will be on Wednesday as a
strong cold front will approach the area, crossing through the area
either Wednesday night or Thursday morning. This should bring a more
widespread opportunity for thunderstorms to the area -- some of
which may be strong to severe as indicated by some of the machine
learning guidance in the mid-range. However, the biggest issue is
that most of the guidance continues to delay the arrival of the
front, meaning that any convection may not move into the area until
late afternoon or even as late as the evening hours. If this were
this case, this would diminish chances for severe weather. This will
continued to be monitored over the coming days. Otherwise,
Wednesday will feature heat indicies in excess of 100 degrees.

By Thursday, the depending on the timing and forward progression of
the cold front, there will likely be some lingering shower and
thunderstorm activity around through Thursday night. For Friday and
into next weekend, we should see some drastic improvements across
the area as the cold front moves away and strong high pressure
builds over the Great Lakes. This will result in dry conditions
where our temperatures are expected to be as much as 5-10 degrees
below average through next weekend.

&&

.AVIATION /06Z SUNDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Tonight... Prevailing VFR with lowering CIGS then VSBYs from
West to east as showers and a few tstms arrive with the
approaching front. IFR conditions, mainly due to lower
visibility with heavier showers and storms. MVFR CIGs may
linger even as showers and storms dissipate/depart. East to
Southeast winds 5 to 10 knots. Medium confid overall.

Sunday... Low clouds and lower vsbys in showers and fog look to
prevail across the region much of Sunday. We'll go along with
the guidance which suggests that high-end IFR or low-end MVFR
conditions will be across the region. Low confid in when/if
improvements will take place, but for now have mostly placed
VCTS during 18-21Z period most terminals. South winds mostly
around 10 knots. Low Confid.

Outlook...

Sunday night...Sub-VFR conditions possible with a chance of showers
and thunderstorms.

Monday through Wednesday...VFR. No significant weather expected.

Wednesday night through Thursday...Sub-VFR conditions possible with
a chance of showers and thunderstorms.

&&

.MARINE...
The East to Southeast onshore flow looks to weaken overnight.
Winds will become mostly South on Sunday, Winds and seas will
remain below SCA levels thru the period. There will be showers
and a few tstms across the waters tonight and Sunday. Higher
winds and seas near tstms are expected.

Outlook...

Sunday night through Thursday...No marine headlines expected as
winds will largely remain below 20 kt and seas around 2 feet or
less. A chance of showers and thunderstorms expected on Sunday night
with fair weather expected for Monday through Wednesday. Another
chance of showers and storms are possible for Wednesday night into
Thursday.

Rip Currents...

For Sunday, winds be southerly around 5 to 10 MPH. Breakers of
around 1 to 2 feet are expected. Period will be 5 to 8 seconds.
As a result, a LOW risk for rip currents is in place at all
beaches.

For Monday, winds turn northerly and then easterly around 5 to
10 MPH. Breakers decrease slightly to around 1 foot. Period
will remain 5 to 8 seconds. As a result, a LOW risk for rip
currents is in place at all beaches.

For specific beach forecasts, visit weather.gov/beach/phi

&&

.TIDES/COASTAL FLOODING...
Due to the new moon occuring on July 24, some spotty minor coastal
flooding may occur again with the high tide tonight into Sunday.
The most likely locations for any spotty minor tidal flooding
are along the Delaware Bay, as well as around Cape May. No coastal
flooding is anticipated along the northeastern portion of Chesapeake
Bay.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...None.

&&

SYNOPSIS...AKL/DeSilva
NEAR TERM...AKL/OHara/RCM
SHORT TERM...AKL/DeSilva
LONG TERM...AKL/DeSilva
AVIATION...AKL/DeSilva/OHara/RCM
MARINE...DeSilva/OHara/RCM
TIDES/COASTAL FLOODING...WFO PHI

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
456 AM EDT Sat Jul 26 2025

MDZ012-015-019-020-270900-
Kent MD-Queen Annes-Talbot-Caroline-
456 AM EDT Sat Jul 26 2025

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Heat index values over 100 will be possible by Tuesday and Wednesday
of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.