Small Craft Advisory 66, NWS Philadelphia/Mount Holly

401 
WHUS71 KPHI 011112
MWWPHI

URGENT - MARINE WEATHER MESSAGE
National Weather Service Mount Holly NJ
712 AM EDT Wed Jul 1 2026

ANZ450>455-020000-
/O.CON.KPHI.SC.Y.0066.260701T1600Z-260702T0400Z/
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out
20 NM-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out
20 NM-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM-
712 AM EDT Wed Jul 1 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO
MIDNIGHT EDT TONIGHT...

* WHAT...South winds 15 to 25 kt with gusts up to 30 kt and seas 
  3 to 5 ft expected.

* WHERE...Portions of Atlantic coastal waters. 

* WHEN...From noon today to midnight EDT tonight.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

Staarmann

169 
WHUS71 KPHI 011716
MWWPHI

URGENT - MARINE WEATHER MESSAGE
National Weather Service Mount Holly NJ
116 PM EDT Wed Jul 1 2026

ANZ450>455-020400-
/O.CON.KPHI.SC.Y.0066.000000T0000Z-260702T0400Z/
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out
20 NM-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out
20 NM-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM-
116 PM EDT Wed Jul 1 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

* WHAT...South winds 15 to 25 kt with gusts up to 30 kt and seas 
  3 to 6 ft.

* WHERE...Portions of Atlantic coastal waters. 

* WHEN...Until midnight EDT tonight.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

581 
WHUS71 KPHI 020358
MWWPHI

URGENT - MARINE WEATHER MESSAGE
National Weather Service Mount Holly NJ
1158 PM EDT Wed Jul 1 2026

ANZ450>455-020500-
/O.EXP.KPHI.SC.Y.0066.000000T0000Z-260702T0400Z/
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out
20 NM-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out
20 NM-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM-
1158 PM EDT Wed Jul 1 2026

...SMALL CRAFT ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...

Seas will remain near 3 to 4 feet, but will generally diminish
some overnight.

$$

Staarmann

Area Forecast Discussion
National Weather Service Mount Holly NJ
739 PM EDT Tue Jun 30 2026

.WHAT HAS CHANGED...
The Aviation section has been updated for the 00Z TAFs and Key
Message 1 has also been updated.

&&

.KEY MESSAGES...
1. An isolated shower or thunderstorm remains possible for
areas mainly near and north of I-78 this evening. There is
another chance for isolated thunderstorms across much of the
area on Wednesday.

2. Dangerous heat and humidity will build over the Northeast
and Mid Atlantic Wednesday through Saturday. All time record
high temperatures could be challenged Thursday and Friday.

3. There is the potential for additional and more widespread
afternoon and evening thunderstorms starting on Friday and
lasting into the holiday weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...An isolated shower or thunderstorm remains
possible for areas mainly near and north of I-78 this evening.
There is another chance for isolated thunderstorms across much
of the area on Wednesday.

Earlier this afternoon, an MCS was located well to the north in
New York State. As this activity has evolved, it has decreased
in coverage. There is an instability axis off to our north and
west currently. For our area, the instability quickly drops off
and the environment is not as supportive of the convection
maintaining itself. Currently, there are still some isolated
showers and thunderstorms off to our north. For the remainder of
this evening, an isolated shower and thunderstorm will remain
possible mainly near and north of I-78. In terms of the severe
threat, this looks to be diminishing for our area.

For Wednesday, instability is forecast to be high (potentially
3000 J/kg or greater) across the area, especially along and
northwest of I-95 by the afternoon hours. Due to the strong
subsidence and ridging building in from the west, there will
also be a lot of mid level dry air contributing to high DCAPE
(1000-1500 J/kg). Latest CAMs continue hinting at potential for
some convective initiation within this environment, despite the
strong subsidence. While coverage of any thunderstorms would be
relatively isolated, any storms that do form could be capable
of producing strong microbursts with damaging winds. SPC has
highlighted our northern half of our CWA in a MARGINAL (level 1
out of 5) risk for severe thunderstorms, with a SLIGHT (level 2
out of 5) in the far north.

KEY MESSAGE 2...Dangerous heat and humidity will build over the
Northeast and Mid Atlantic Wednesday through Saturday. All time
record high temperatures could be challenged Thursday and
Friday.

Strong mid-level ridging is developing across the Mississippi
Valley, Great Lakes, and Ohio Valleys early this week. Ridging
will then build eastward into the Northeast and Mid Atlantic by
Wednesday and persist into the holiday weekend. A west to
southwest flow on Wednesday will shift more west to northwest by
Friday. The ridge will finally start to break and retreat some
starting Saturday into Sunday.

High temperatures will climb into the mid and upper 90s on
Wednesday, and then from 100 to 105 degrees on Thursday and
Friday. With a south to southwest flow on Wednesday, dewpoints
are less likely to mix out significantly in the afternoon.
Resulting heat indices are forecast to range mainly from around
100-105 degrees. By Thursday and especially Friday, the shift to
a more west or northwest flow will allow for better mixing out
of dewpoints during the afternoon, and also a component of
downsloping (adiabatic warming) from the Appalachians. This will
support temperatures climbing above 100 degrees as dewpoints
mix out into the mid 60s during the afternoon hours. Resulting
forecast heat indices are mostly in the 105-110 degree range.
This is indeed the type of synoptic pattern that could challenge
all time record high temperatures in our region. See the
Climate section below for more information on record
temperatures.

Temperatures will abate somewhat on Saturday as the ridge
begins to break and retreat to the southwest. However, high
temperatures will still be in the mid 90s to near 100 degrees.
The prevailing flow direction will dictate how much mixing out
of dewpoints occur on Saturday. Currently, we have upper 60s to
near 70 degree dewpoints, which results in 100-105 degree heat
indices. Highs will remain in the low to mid 90s Sunday and
Monday as well, with heat indices still in the mid 90s to low
100s. So we certainly could see heat related impacts continuing
beyond Saturday despite a slight improvement in temperatures.

Given the increasing confidence in significant impacts from the
3 to 4 day excessive heat and humidity with heat indices
reaching into the 100-110 degree range each day, the Extreme
Heat Watch was previously upgraded to an Extreme Heat Warning
for all of southeastern Pennsylvania, northern Delaware, and
portions of New Jersey. This includes all areas where the
previous watch was effective beginning Wednesday afternoon
through Saturday. While heat indices may fall shy of warning
criteria by Saturday, impacts will likely be worsened by the
multiple days of heat and busy outdoor holiday festivities.

Elsewhere across far southern New Jersey, the New Jersey barrier
islands, and Delmarva, the Extreme Heat Watch remains in
effect beginning Thursday afternoon through Saturday. Within the
remaining watch area, heat indices up to 100 degrees are
possible on Wednesday, but the more notable heat won't begin
until Thursday, and the highest heat indices are more probable
on Friday.

The mid-level ridge will break and retrograde back towards the
south and west beginning Saturday, and a mid-level trough will
try to slide down into the Northeast. This pattern change will
begin to favor slightly cooler temperatures and a break in the
extreme heat by Sunday and Monday, as well as the potential for
showers and thunderstorms for the holiday weekend (see Key
Message 3 below).

KEY MESSAGE 3...There is the potential for additional and more
widespread afternoon and evening thunderstorms starting on
Friday and lasting into the holiday weekend.

The mid-level ridge looks to break down and retrograde back to
the south and west starting on Friday, and this will allow mid-
level troughiness to develop over the Northeast. With several
shortwaves riding over the top of the ridge and into the local
area, this may support more widespread afternoon and evening
showers and thunderstorms starting on Friday, but especially on
Saturday and Sunday. Currently, PoPs are around 10-20% on
Friday and 30-50% on Saturday and Sunday.

While details of this activity won't become clear until later
this week, it is important to point out that any holiday weekend
festivities could be impacted by thunderstorms (in addition to
the extreme heat). The environmental setup would be favorable
for strong to severe thunderstorms, if any storms do develop.
We'll continue to monitor this potential.

&&

.AVIATION /00Z WEDNESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Tonight...VFR. Very low risk of a shower or t-storm, for the
northern terminals. South to southwest winds remaining near
5-10 kts overnight. High confidence.

Wednesday...VFR. Very low risk of a shower or t-storm in the
afternoon. South to southwest winds remaining near 5-10 kts with
gusts upwards of 20 kt for KMIV/KACY in the afternoon. High
confidence.

Outlook...

Wednesday night through Saturday...VFR. Low chance (20%) of a
thunderstorm Wednesday night and Friday, better chance (30-40%)
Saturday, otherwise no significant weather.

&&

.MARINE...
Southerly winds increasing to 15-20 kts. Winds as high as 25
kts north of Barnegat Light. Seas increasing to 3-5 feet by
evening. A Small Craft Advisory in effect thru midnight for the
northern ocean zones. Winds and seas diminish late tonight but
may increase again later Wednesday, with another SCA potential.

Outlook...

Thursday through Friday...There is potential for marginal
advisory criteria to be met with winds increasing to near 20-25
kts with seas nearing 5 feet Thursday afternoon and evening,
mainly north of Atlantic City.

Rip Currents...

For the rest of today, southerly winds will continue around 15
to 25 mph with breaking waves in the surf zone around 1-3 feet.
There are also multiple swell groups and we're only one day
removed from yesterday's Full Moon. For these reasons, we'll
continue with a MODERATE risk of dangerous rip currents for
coastal Ocean County south through Cape May County along the NJ
shore. For coastal Monmouth County and the Delaware Beaches
we'll continue with a LOW risk.

For Wednesday, breaking wave heights in the surf zone will be
increasing to around 3 to 4 feet with S/SW winds around 25 mph.
There will also be multiple swell groups and we'll still only be 2
days removed from the Full Moon. Given these factors, the latest
indications are that shore areas in Cape May and Atlantic Counties
in NJ will have a HIGH risk for the development of dangerous
rip currents. For our remaining NJ shore zones as well as the
Delaware Beaches, we'll continue with a MODERATE risk.

For Thursday, conditions look similar except both wind and wave
heights look to come down some and we'll also be another day removed
from Monday's Full Moon. For these reasons we're forecasting a
MODERATE risk for the development of dangerous rip currents for our
NJ shore zones and a LOW risk for the Delaware beaches.

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

&&

.CLIMATE...
Record breaking heat is forecast from Wednesday through
Saturday. Temperature records for our climate sites are listed
below:

All Time Record High Temperatures

Site                  Record / Date
Allentown (ABE)          105 / July 3, 1966
AC Airport (ACY)         106 / June 28, 1969
AC Marina (55N)          104 / August 7, 1918
Georgetown (GED)         104 / July 22 & 23, 2011
Mount Pocono (MPO)       103 / July 3, 1911
Philadelphia (PHL)       106 / August 7, 1918
Reading (RDG)            106 / July 22, 2011
Trenton (TTN)            106 / July 9, 1936 & July 22, 2011
Wilmington (ILG)         107 / August 7, 1918

All Time Record Warmest Low Temperatures

Site                  Record / Date
Allentown (ABE)           79 / July 15, 1995
AC Airport (ACY)          84 / July 23, 2011
AC Marina (55N)           82 / July 21, 2019
Georgetown (GED)          84 / July 23, 2011
Mount Pocono (MPO)        76 / July 12, 1952
Philadelphia (PHL)        83 / July 24, 2010 & July 23, 2011
Reading (RDG)             81 / August 7, 1918
Trenton (TTN)             84 / August 11, 1895
Wilmington (ILG)          84 / August 7, 1918

Record Number of Consecutive 100+ Degree Days

Site                  Record / Date
Allentown (ABE)       3 days / July 9-11, 1936 & July 2-4, 1966
AC Airport (ACY)      3 days / July 2-4, 1966 & July 22-24, 2011
AC Marina (55N)        1 day / Occurred multiple times
Georgetown (GED)      2 days / Most recent June 24-25, 2025
Mount Pocono (MPO)     1 day / July 3, 1911
Philadelphia (PHL)    3 days / July 2-4, 1966 & July 8-10, 1993
Reading (RDG)         3 days / Most recent July 21-23, 2011
Trenton (TTN)         3 days / Most recent July 21-23, 2011
Wilmington (ILG)      3 days / Most recent July 9-11, 1936

Record High Temperatures
                          July 1
Site                  Record / Year
Allentown (ABE)           98 / 2018
AC Airport (ACY)          99 / 1968
AC Marina (55N)           98 / 1968
Georgetown (GED)          99 / 2012
Mount Pocono (MPO)        88 / 1963, 1964, 1968, & 2018
Philadelphia (PHL)       102 / 1901
Reading (RDG)            101 / 1901
Trenton (TTN)             98 / 1898, 1901, & 1945
Wilmington (ILG)          97 / 1931 & 1963

Record Warmest Low Temperatures
                          July 1
Site                  Record / Year
Allentown (ABE)           74 / 1930
AC Airport (ACY)          77 / 1945
AC Marina (55N)           79 / 1945
Georgetown (GED)          76 / 1945
Mount Pocono (MPO)        67 / 1946, 1971, 2013, 2017, 2025
Philadelphia (PHL)        82 / 1901
Reading (RDG)             76 / 1968
Trenton (TTN)             77 / 1945
Wilmington (ILG)          75 / 2013

Record High Temperatures
                          July 2
Site                  Record / Year
Allentown (ABE)          102 / 1966
AC Airport (ACY)         100 / 1966
AC Marina (55N)           97 / 1968
Georgetown (GED)          99 / 1953
Mount Pocono (MPO)        93 / 1911
Philadelphia (PHL)       103 / 1901
Reading (RDG)            102 / 1966
Trenton (TTN)            100 / 1901
Wilmington (ILG)          98 / 1941 & 1966

Record Warmest Low Temperatures
                          July 2
Site                  Record / Year
Allentown (ABE)           75 / 2013
AC Airport (ACY)          79 / 2002
AC Marina (55N)           76 / 2012
Georgetown (GED)          77 / 1959
Mount Pocono (MPO)        70 / 1903
Philadelphia (PHL)        82 / 1901
Reading (RDG)             79 / 1901
Trenton (TTN)             79 / 1901
Wilmington (ILG)          75 / 1941 & 2014

Record High Temperatures
                          July 3
Site                  Record / Year
Allentown (ABE)          105 / 1966
AC Airport (ACY)         104 / 1966
AC Marina (55N)           99 / 1919
Georgetown (GED)         101 / 1954
Mount Pocono (MPO)       103 / 1911
Philadelphia (PHL)       104 / 1966
Reading (RDG)            103 / 1898 & 1966
Trenton (TTN)            102 / 1966
Wilmington (ILG)         102 / 1966

Record Warmest Low Temperatures
                          July 3
Site                  Record / Year
Allentown (ABE)           75 / 2018
AC Airport (ACY)          78 / 2018
AC Marina (55N)           76 / 1983, 2002, & 2018
Georgetown (GED)          79 / 1953
Mount Pocono (MPO)        69 / 2013
Philadelphia (PHL)        77 / 1876, 1901, &2002
Reading (RDG)             76 / 2018
Trenton (TTN)             76 / 1901 & 1966
Wilmington (ILG)          76 / 2002

Record High Temperatures
                          July 4
Site                  Record / Year
Allentown (ABE)          102 / 1949
AC Airport (ACY)         102 / 1966
AC Marina (55N)           99 / 1966
Georgetown (GED)         100 / 1966
Mount Pocono (MPO)        99 / 1911
Philadelphia (PHL)       103 / 1966
Reading (RDG)            100 / 1911 & 1966
Trenton (TTN)             99 / 1919, 1999, & 2010
Wilmington (ILG)         102 / 1966

Record Warmest Low Temperatures
                          July 4
Site                  Record / Year
Allentown (ABE)           75 / 1999
AC Airport (ACY)          75 / 1974, 1983, 1999, & 2002
AC Marina (55N)           79 / 2002
Georgetown (GED)          75 / 1999 & 2012
Mount Pocono (MPO)        70 / 2002 & 2013
Philadelphia (PHL)        79 / 1919
Reading (RDG)             78 / 1966
Trenton (TTN)             78 / 1966
Wilmington (ILG)          76 / 1999

Annual temperature extremes
For Trenton (TTN), this may be the first year with temperatures
both below zero and 100+ since 1988. The low so far this year
was -1 on 1/21.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Extreme Heat Warning from noon Wednesday to 8 PM EDT Saturday
     for PAZ054-055-060>062-070-071-101>106.
     Air Quality Alert until midnight EDT tonight for PAZ060>062.
NJ...Extreme Heat Warning from noon Wednesday to 8 PM EDT Saturday
     for NJZ001-007>010-012>020-027.
     Extreme Heat Watch from Thursday afternoon through Saturday
     evening for NJZ021>026.
     High Risk for Rip Currents from Wednesday morning through Wednesday
     evening for NJZ024-025.
DE...Extreme Heat Warning from noon Wednesday to 8 PM EDT Saturday
     for DEZ001.
     Extreme Heat Watch from Thursday afternoon through Saturday
     evening for DEZ002>004.
MD...Extreme Heat Watch from Thursday afternoon through Saturday
     evening for MDZ012-015-019-020.
MARINE...Small Craft Advisory until midnight EDT tonight for ANZ450-451.

&&

DISCUSSION...Guzzo/RCM/Staarmann
AVIATION...Guzzo/RCM/Staarmann
MARINE...Fitzsimmons/RCM/Staarmann

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
529 AM EDT Tue Jun 30 2026

MDZ012-015-019-020-010930-
Kent MD-Queen Annes-Talbot-Caroline-
529 AM EDT Tue Jun 30 2026

...EXTREME HEAT WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
SATURDAY EVENING...

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Extreme Heat Watch.

In addition to the extreme heat, severe thunderstorms are possible
Friday through Sunday.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

Staarmann