Small Craft Advisory 53, NWS Philadelphia/Mount Holly

535 
WHUS71 KPHI 190718
MWWPHI

URGENT - MARINE WEATHER MESSAGE
National Weather Service Mount Holly NJ
318 AM EDT Tue May 19 2026

ANZ450>453-192030-
/O.CON.KPHI.SC.Y.0053.260519T1600Z-260520T0400Z/
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-
318 AM EDT Tue May 19 2026

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

* WHAT...South winds 10 to 20 kt with gusts up to 25 kt and seas 
  3 to 5 ft expected.

* WHERE...Coastal waters from Sandy Hook to Cape May NJ out 20 
  NM.

* 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.

&&

$$

AKL

577 
WHUS71 KPHI 191827
MWWPHI

URGENT - MARINE WEATHER MESSAGE
National Weather Service Mount Holly NJ
227 PM EDT Tue May 19 2026

ANZ450>453-191930-
/O.CAN.KPHI.SC.Y.0053.000000T0000Z-260520T0400Z/
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-
227 PM EDT Tue May 19 2026

...SMALL CRAFT ADVISORY IS CANCELLED...

The conditions are now anticipated to remain below advisory 
criteria and therefore this advisory has been cancelled.

$$

Area Forecast Discussion
National Weather Service Mount Holly NJ
116 PM EDT Mon May 18 2026

.WHAT HAS CHANGED...
Aviation section updated for the 18z TAFs.

&&

.KEY MESSAGES...
1. Unusual and potentially record setting early season heat is
expected through Wednesday. High temperatures will generally be
upward of 10 to 20 degrees above normal, with low to mid 90s
expected for many areas today through Wednesday.

2. A cold front will bring some showers and thunderstorms to
the region Wednesday through Thursday, then much cooler
temperatures by the end of this week.

&&

.DISCUSSION...
KEY MESSAGE 1...Unusual and potentially record setting early
season heat is expected through Wednesday. High temperatures
will generally be upward of 10 to 20 degrees above normal, with
low to mid 90s expected for many areas today through Wednesday.

An upper level ridge will remain in place across the East Coast
through Tuesday then shift offshore and weaken into Wednesday.
This will bring a period of well above normal, summer-like
temperatures which could challenge monthly all time records for
May. At the surface, Bermuda high pressure will remain in place
offshore as a low pressure system develops across the Plain,
passing across the Great Lakes Tuesday and passing well to our
north by Wednesday. This will result in a very warm south to
southwesterly flow for several days.

The warming trend that began over the weekend will continue into
early this week. High temperature for inland areas today will be
generally in the upper 80s to mid 90s for eastern PA, inland NJ
and Delmarva. However, the flow be more out of the south to
even southeast, so there will be more of cooling influence near
the coast by the afternoon as the marine layer pushes inland.
This cooling will extend a bit farther inland compared to
Sunday given the surface flow direction. This will keep highs
in these areas near the coast mainly in the mid 70s to mid 80s,
occurring around midday before cooling off into the afternoon
and evening.

Dewpoints should mix out a bit this afternoon due to a lack of
deep moisture return, cool ocean temperatures, and low
evapotranspiration, but will still be mainly in the low to mid
60s. Not terribly humid, but certainly uncomfortable since we
aren't acclimated to it yet. The dewpoint values will translate
to heat indices being close to the air temperatures. With
temperatures getting into the mid 90s in the urban corridor,
we've opted to start the Heat Advisory at noon today, though
temperatures and heat indices will likely be hotter on Tuesday
(more on that below). Given the likely bay breeze developing in
Wilmington today, we've excluded New Castle County from the
advisory.

Mostly sunny skies today with scattered cirrus around. Can't
rule out an isolated shower/storm in our western zones this
afternoon, but this potential is low enough that we don't have
much in the way of precip mentioned in the forecast.

Temperatures tonight will be quite warm by mid May standards.
Lows will only be in the mid 60s to low 70s, which will
challenge daily warmest low temperature records for May 19th.

Confidence continues to increase that Tuesday will be the
hottest day across the region. Widespread temperatures in the
mid 90s are expected. Even with many of the aforementioned
factors keeping heat indicies close to air temperatures
will continue into Tuesday, the hotter air temperatures will
push heat indicies higher and exceed the early season criteria
in the urban areas. Thus, the Heat Advisory will continue
through Tuesday evening.

The heat forecast remains a bit more uncertain for Wednesday,
as a faster progression of an approaching front may bring more
clouds ahead of the showers and storms, and cap temps and heat
indices a bit lower. Regardless, it will still be abnormally
warm and keep portions of the area close to record high
temperatures, particularly near and southeast of I-95 where
skies will remain clear the longest.

The heat looks to break by Thursday following the cold frontal
passage late Wednesday. Temperatures will moderate closer to
normal for the remainder of the week and into next weekend.

KEY MESSAGE 2...A cold front will bring some showers and
thunderstorms to the region Wednesday through Thursday, then
much cooler temperatures by the end of this week.

As mentioned above, a cold front will approach the area Wednesday
and bring an end to the stretch of above normal temperatures by
Thursday. Showers and thunderstorms will accompany this front
as it passes through the region. Recent guidance trends continue
to show the front moving through during the second half of
Wednesday into Wednesday night. At this range there is still
uncertainties in timing, but if the front moves through during
the day Wednesday, then the potential for stronger storms
increases as there will be plenty of instability present.
Currently, the better forcing looks to be displaced to the north
of the front. All of this said, it remains still a bit early to
get very specific on the details and extent of the convection,
impacts, and hazards. The front then looks to linger nearby or
just south of the area on Thursday leading to more potential for
showers. By the end of the week and into next weekend, the
trend continues to show a more unsettled pattern.

&&

.AVIATION /18Z MONDAY THROUGH SATURDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

This afternoon...VFR. South to southwest winds around 10 knots
with some local gusts 15-20 knots at times (southeast winds
especially at KILG, KMIV and KACY. Moderate confidence.

Tonight...VFR. South to southwest winds 5-10 knots, becoming
locally light and variable. High confidence.

Tuesday...VFR. Southwesterly winds 5-8 knots increasing to 10-15
knots, with some afternoon gusts up to 20 knots. Moderate
confidence.

Outlook...

Tuesday night...VFR.

Wednesday through Thursday...Sub-VFR with rain showers and
thunderstorms Wednesday afternoon and evening. Rain showers may
continue into Thursday.

Friday...Sub-VFR possible with the chance for rain showers.

&&

.MARINE...
Southerly winds increase to around 10-15 kts, gusting up to 20
kts by this afternoon, but the conditions are expected to stay
below Small Craft Advisory levels. Seas around 3-4 feet. Winds
and seas lessening some overnight.

Outlook...

Tuesday through Wednesday...Southwest winds increase through
the day Tuesday with Small Craft Advisory conditions possible by
Tuesday afternoon as wind gusts reach near 25 kt. Seas look to
start to reach near 5 feet as well Tuesday evening. Seas lessen
by Wednesday morning but elevated winds out of the southwest
remain through the day Wednesday with gusts near 25 kt. Showers
and potentially some isolated thunderstorms move through
Wednesday afternoon into early Wednesday night.

Thursday...Conditions expected to be below Small Craft Advisory
criteria by this time but showers may linger.

Friday...Conditions are expected to be below Small Craft
Advisory criteria. There is the chance for some rain showers.

Rip Currents...

This afternoon, south-southeast winds will be 10 to 15 mph with
breaking waves of 1 to 2 feet. There will be a southeasterly
swell with a period of around 8 seconds. As a result, there is a
MODERATE risk for the development of dangerous rip currents at
the Jersey Shore and a LOW risk at Delaware Beaches where winds
will be more shore parallel.

Tuesday, south-southwesterly winds of 10-20 mph with breaking
waves of 2 to 3 feet. A southeasterly swell will remain, though
the period may be slightly shorter. For now, have opted for a
MODERATE risk for the development of dangerous rip currents for
all NJ and DE beaches.

Important to note that while surface temperatures inland will
be in the upper 80s to low 90s on Monday, and low to mid 90s
Tuesday, temperatures along the coasts will mainly be in the 70s
to near 80 due to ocean temperatures in the 50s. These cold
water temperatures can quickly cause hypothermia and physical
incapacitation to anyone suddenly immersed in the water.

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

&&

.CLIMATE...
Near record breaking temperatures are forecast from today through
Wednesday. High temperatures Tuesday and low temperatures
Wednesday morning could challenge monthly all time records for
May. Records for our climate sites are listed below:

Monthly Record High Temperatures for May

Site                  Record/Date
Allentown (ABE)           97/May 19, 1962
AC Airport (ACY)          99/May 29, 1969
AC Marina (55N)           95/May 31, 1895 & May 23, 1925
Georgetown (GED)          98/May 28, 1991
Mount Pocono (MPO)        94/May 22, 1911
Philadelphia (PHL)        97/May 30 & 31, 1991
Reading (RDG)             97/May 20, 1996
Trenton (TTN)             99/May 23, 1911 & May 31, 1986
Wilmington (ILG)          98/May 10, 1895 & May 30, 1895

Monthly Record Warmest Low Temperatures for May

Site                  Record/Date
Allentown (ABE)           71/May 31, 1975, May 28 & 31, 1991
AC Airport (ACY)          73/May 24, 2004 & May 19, 2017
AC Marina (55N)           73/May 30 & 31, 1987, & May 31, 1991
Georgetown (GED)          74/May 23, 1953 & May 20, 2019
Mount Pocono (MPO)        68/May 21, 1996
Philadelphia (PHL)        78/May 31, 1895
Reading (RDG)             72/May 28 & 31, 1939, & May 31, 1991
Trenton (TTN)             75/May 31, 1895
Wilmington (ILG)          75/May 30, 1895

Record High Temperatures
                           May 18
Site                  Record/Year
Allentown (ABE)           96/1962
AC Airport (ACY)          93/1987
AC Marina (55N)           90/1987
Georgetown (GED)          91/1974
Mount Pocono (MPO)        87/1962
Philadelphia (PHL)        94/1962
Reading (RDG)             96/1962
Trenton (TTN)             96/1986
Wilmington (ILG)          94/1962

Record Warmest Low Temperatures
                           May 18
Site                  Record/Year
Allentown (ABE)           65/2017
AC Airport (ACY)          70/2017
AC Marina (55N)           66/2017
Georgetown (GED)          72/2017
Mount Pocono (MPO)        61/2017
Philadelphia (PHL)        72/2017
Reading (RDG)             67/1900, 1943, & 2017
Trenton (TTN)             71/2017
Wilmington (ILG)          72/2017

Record High Temperatures
                           May 19
Site                  Record/Year
Allentown (ABE)           97/1962
AC Airport (ACY)          96/1962
AC Marina (55N)           92/1998
Georgetown (GED)          96/1962
Mount Pocono (MPO)        89/1962
Philadelphia (PHL)        96/1962
Reading (RDG)             96/1962
Trenton (TTN)             96/1962
Wilmington (ILG)          95/1962

Record Warmest Low Temperatures
                           May 19
Site                  Record/Year
Allentown (ABE)           65/2017
AC Airport (ACY)          73/2017
AC Marina (55N)           68/1998
Georgetown (GED)          73/2017
Mount Pocono (MPO)        60/1943
Philadelphia (PHL)        74/1877
Reading (RDG)             68/1962
Trenton (TTN)             70/2017
Wilmington (ILG)          70/2017

Record High Temperatures
                           May 20
Site                  Record/Year
Allentown (ABE)           92/1962 & 1996
AC Airport (ACY)          96/1996
AC Marina (55N)           93/1996
Georgetown (GED)          95/1962
Mount Pocono (MPO)        89/1996
Philadelphia (PHL)        94/1962 & 1996
Reading (RDG)             97/1996
Trenton (TTN)             94/1996
Wilmington (ILG)          96/1996

Record Warmest Low Temperatures
                           May 20
Site                  Record/Year
Allentown (ABE)           66/2019
AC Airport (ACY)          68/1996
AC Marina (55N)           69/1996
Georgetown (GED)          74/2019
Mount Pocono (MPO)        61/1959
Philadelphia (PHL)        71/2019
Reading (RDG)             69/1959 & 1996
Trenton (TTN)             68/1903, 1959, & 1962
Wilmington (ILG)          70/2019

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT Tuesday for PAZ070-071-104-106.
     Air Quality Alert until midnight EDT tonight for PAZ060>062-
     070-071-101>106.
NJ...Air Quality Alert until 11 PM EDT this evening for NJZ001-
     007>010-012-015-017>019.
     Air Quality Alert from 11 AM to 11 PM EDT Tuesday for
     NJZ012>021-026-027.
     Heat Advisory until 8 PM EDT Tuesday for NJZ015-017>019.
DE...None.
MD...None.
MARINE...None.

&&

DISCUSSION...AKL/Fitzsimmons/Staarmann
AVIATION...AKL/Gorse/Staarmann
MARINE...AKL/Staarmann

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
505 AM EDT Mon May 18 2026

MDZ012-015-019-020-190915-
Kent MD-Queen Annes-Talbot-Caroline-
505 AM EDT Mon May 18 2026

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...Tuesday through Sunday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Staarmann