Scattered thunderstorms producing heavy rain developed across the area on the afternoon of May 14.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PHI wrote it up.
Scattered thunderstorms producing heavy rain developed across the area on the afternoon of May 14.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at May 14, 1:50 PM EST, 10 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
250 PM EDT Wed May 14 2025
.SYNOPSIS...
Low pressure will linger across the Mid Atlantic through the
Thursday, resulting in mild, humid, and showery conditions.
Brief period of ridging comes in Thursday Night, with a warm
front coming through on Friday morning. Unsettled weather
continues through Saturday until a strong cold front comes
through on Saturday Night. Drier high pressure will settle into
the region by Sunday into early next week.
&&
.NEAR TERM /THROUGH THURSDAY/...
Cloudy, mild, showery, and humid conditions persisting through
Thursday.
A decaying upper low over the Midwest will slowly push a
negatively tilted trough axis slowly through our region locally
through Thursday. Weak surface low pressure will remain across
the Mid Atlantic through this period as well.
The main round of moderate to heavy rain showers will continue
to impact portions of central and northern New Jersey and far
eastern Pennsylvania through the remainder of the afternoon. For
these areas, an additional 0.5-1" of rainfall is possible,
potentially leading to localized minor flooding. Elsewhere, a
few isolated showers/storms are possible. Temperatures remaining
mainly in the upper 50s and 60s, and in the 70s across Delmarva.
A lull in shower activity is expected overnight, however areas
of fog are anticipated to develop across much of the area along
with continued low clouds and light winds. Humid with lows in
the mid 50s (north) to mid 60s (south).
For Thursday, the low clouds and fog will dissipate as the
morning progresses, and some breaks of sun may even occur by
afternoon, especially across Delmarva. With the mid level
trough axis remaining in the vicinity and the weak surface low
nearby as well, some diurnal instability should result in some
isolated to scattered showers/storms into the afternoon. With
PWats around 1.25-1.50", heavy downpours will be possible as
well as gusty winds and small hail. Severe thunderstorms are
unlikely, but can't totally rule one out. High temperatures will
be mainly in the 70s and a bit muggy.
&&
.SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
A brief period of quiet weather comes Thursday night as a brief
period of ridging moves overhead. Skies may actually clear out
some Thursday evening into the first half of Thursday Night
before a warm front moves in late Thursday/early Friday morning.
Mainly dry through Thursday Night though but still mild, with
lows in the upper 50s/low 60s.
A warm front lifts through Friday morning, bringing some light
showers as warm air advection ramps up. This will allow
temperatures to climb into the 80s on Friday, with more
instability in place as well. Forcing looks rather weak though
with ridging not far away and only a weak shortwave coming in
and no advancing cold front until Saturday. Thus, thinking it
will be just unsettled with scattered showers, primarily in the
afternoon with a few thunderstorms mixed in. It's possible a
decaying MCS impacts the region in the morning sometime Friday,
but the severe threat with this would be low. Showers diminish
in coverage with the loss of daytime heating on Friday Night,
but still cannot rule out some light sprinkles through the
night. Mild pattern continues with low to mid 60s for lows.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
Saturday looks to be the day to monitor for any severe weather.
Forcing strengthens with an incoming potent shortwave digging
from the Great Lakes. At the surface, an area of low pressure
slides by to the north Saturday into Saturday Night, with a cold
front advancing towards and eventually through the region.
Temperatures will climb into the 80s and it will feel quite
muggy ahead of the front. Instability looks to be on the order
of around 1000 J/kg with relatively favorable shear. Thinking
any showers and thunderstorms will come in the afternoon and
evening as the front arrives. Main concern would be damaging
wind gusts and heavy downpours, but still a good amount of
uncertainty being a few days out. Coverage in showers and
thunderstorms diminishes into the night with the loss of daytime
heating and passage of the front.
Sunday and beyond actually looks pretty nice for now. With the
front coming through, it should result in dry conditions and
seasonable weather to close out the weekend and start next week.
Perhaps a little gusty on Sunday, but nothing that looks too
significant.
&&
.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Through 00Z...Mainly prevailing IFR ceilings with some MVFR
possible at times. MVFR visibility possible in BR. A few
isolated showers possible. East to northeast winds near 10 kts.
High confidence on MVFR to IFR prevailing, but low confidence
in details.
Tonight...IFR conditions expected with LIFR likely developing.
East to northeast winds 5 kts or less. High confidence in
prevailing IFR.
Thursday...IFR and LIFR early. Visibility improvement by 15-18Z,
with ceilings scattering out to VFR by 18-21Z. ENE winds 5 kts
or less early, shifting southerly around 5-10 kts as conditions
improve. Isolated SHRA/TSRA after 18Z. Low confidence on timing
of improvement.
Outlook...
Restrictions possible Thursday night. Conditions expected
improve for Friday and Saturday with prevailing VFR likely
during the day, aside from any showers and thunderstorms move
in. VFR conditions look to come Saturday Night and beyond.
&&
.MARINE...
A Small Craft Advisory remains in effect for all Atlantic coastal
waters through tonight, and through Thursday morning north of
Ocean City, NJ. The Delaware Bay advisory expired at noon.
Winds will diminish considerably this afternoon, however seas
will remain elevated near 4-7 feet through tonight into early
Thursday morning. Areas of fog possible tonight, with visibility
near 1 NM. Some isolated showers/storms possible Thursday
afternoon.
Outlook...
Sub-SCA conditions should then take hold by Thursday evening
and continue through Sunday However, showers and spotty
thunderstorms may continue to be a risk through Saturday,
especially during the afternoon and evening hours.
&&
.TIDES/COASTAL FLOODING...
A new Coastal Flood Advisory was issued for the tidal Delaware
River for the high tide late tonight into early Thursday
morning. Elsewhere, no additional coastal flooding is expected.
Minor coastal flooding is forecast with the overnight high
tides Thursday night and Friday night as well, especially along
the upper reaches of the tidal Delaware River. Additional
advisories may be needed.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Coastal Flood Advisory from 2 AM to 7 AM EDT Thursday for
PAZ070-071-106.
NJ...Coastal Flood Advisory from 2 AM to 7 AM EDT Thursday for
NJZ017>019.
DE...None.
MD...None.
MARINE...Small Craft Advisory until noon EDT Thursday for ANZ450>452.
Small Craft Advisory until 6 AM EDT Thursday for ANZ453>455.
&&
SYNOPSIS...Hoeflich/Staarmann
NEAR TERM...Staarmann
SHORT TERM...Hoeflich/Staarmann
LONG TERM...Hoeflich/Staarmann
AVIATION...Hoeflich/Staarmann
MARINE...Hoeflich/Staarmann
TIDES/COASTAL FLOODING...StaarmannPreliminary Local Storm Report
National Weather Service Mount Holly NJ
1257 PM EDT Wed May 14 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1220 PM Rain Delran 40.02N 74.95W
05/14/2025 M3.00 Inch Burlington NJ Public
rainfall since midnight.
1210 PM Rain Northeast Philadelphia 40.09N 75.02W
05/14/2025 M3.00 Inch Philadelphia PA Public
rainfall since midnight.
&&Preliminary Local Storm Report
National Weather Service Mount Holly NJ
105 PM EDT Wed May 14 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1200 PM Rain Maple Shade 39.96N 75.00W
05/14/2025 M2.00 Inch Burlington NJ Trained Spotter
24 hour total.
&&
SFJPreliminary Local Storm Report
National Weather Service Mount Holly NJ
231 PM EDT Wed May 14 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0215 PM Rain 2 ESE Tabernacle 39.83N 74.67W
05/14/2025 M3.44 Inch Burlington NJ Mesonet
Mesonet station CW0992 Tabernacle.
0218 PM Rain 2 NW Skillman 40.44N 74.74W
05/14/2025 M3.19 Inch Somerset NJ Mesonet
Mesonet station GW4041 HILLSBOROUGH.
0218 PM Rain Skillman 40.42N 74.70W
05/14/2025 M3.17 Inch Somerset NJ Mesonet
Mesonet station EW0478 Skillman.
0215 PM Rain 1 NW Willow Grove 40.15N 75.13W
05/14/2025 M3.13 Inch Montgomery PA Mesonet
Mesonet station FW1161 Willow Grove.
0223 PM Rain 1 W Bristol 40.10N 74.87W
05/14/2025 M2.80 Inch Bucks PA Mesonet
Mesonet station DCBPA Bristol.
0215 PM Rain 2 S Blue Bell 40.13N 75.27W
05/14/2025 M2.78 Inch Montgomery PA AWOS
AWOS station KLOM Philly Wings Field.
0210 PM Rain 2 ENE Somerville 40.58N 74.59W
05/14/2025 M2.77 Inch Somerset NJ Mesonet
Mesonet station FW7617 Bridgewater.
0215 PM Rain 2 W Belle Mead 40.47N 74.72W
05/14/2025 M2.76 Inch Somerset NJ Mesonet
Mesonet station NESN4 2.2 W Belle Mead.
0220 PM Rain 1 SSE Northeast Philade 40.07N 75.00W
05/14/2025 M2.73 Inch Philadelphia PA Mesonet
Mesonet station 9068D 1 SE Northeast
Philadelphia.
0217 PM Rain 3 E Atco 39.77N 74.84W
05/14/2025 M2.69 Inch Camden NJ Mesonet
Mesonet station FW9968 Atco.
0216 PM Rain 1 ESE Lumberton Twp 39.96N 74.79W
05/14/2025 M2.68 Inch Burlington NJ Mesonet
Mesonet station GW2630 Lumberton.
0215 PM Rain 1 E Willow Grove 40.14N 75.11W
05/14/2025 M2.67 Inch Montgomery PA Mesonet
Mesonet station EW1527 Willow Grove.
0216 PM Rain 1 E Holmesburg 40.04N 75.02W
05/14/2025 M2.66 Inch Philadelphia PA Mesonet
Mesonet station DW8567 Philadelphia.
0215 PM Rain 1 NW Berlinsville 40.78N 75.59W
05/14/2025 M2.63 Inch Northampton PA Mesonet
Mesonet station GW5621 WALNUTPORT.
0215 PM Rain 1 SE Turnersville 39.76N 75.05W
05/14/2025 M2.60 Inch Gloucester NJ Mesonet
Mesonet station EW0923 Turnersville.
0216 PM Rain Center Valley 40.53N 75.40W
05/14/2025 M2.57 Inch Lehigh PA Mesonet
Mesonet station GW6050 CENTER VALLEY.
0218 PM Rain 2 WNW Shamong 39.79N 74.75W
05/14/2025 M2.55 Inch Burlington NJ Mesonet
Mesonet station CW5292 Shamong.
0221 PM Rain 1 SE South Jersey Regio 39.93N 74.83W
05/14/2025 M2.54 Inch Burlington NJ ASOS
ASOS station KVAY Mount Holly.
0215 PM Rain 1 SSW Cedarville 40.21N 75.69W
05/14/2025 M2.50 Inch Chester PA Mesonet
Mesonet station EW5860 Pottstown.
&&
GorsePreliminary Local Storm Report
National Weather Service Mount Holly NJ
247 PM EDT Wed May 14 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0145 PM Rain Lansdale 40.24N 75.28W
05/14/2025 M2.05 Inch Montgomery PA Public
&&
GorseThe Philadelphia radar (KDIX), 57 km away, was scanning. The volume nearest the first event began at 19:01 UTC.
4 flash flood. Local standard time, as filed.
Main street was flooded in some areas with up to one foot of water deep estimated. A few cars stalled in the flood waters.
Video showed deep flood waters flowing down Amboy Avenue.
US 22 Westbound was closed due to high water.
The Passaic River at Chatham went into minor flood stage. This results in portions of Shepard Kolluck Park flooding and River Road near Henry Drive flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Jersey in 2025Every state in 2025This day in weather historyWarnings in New Jersey, May 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1263623, 1263626, 1263631, 1263632.