A strong backdoor cold front moved from northeast to southwest across the area late Saturday afternoon April 15th into Sunday morning April 16th. Not only was there a significant drop in temperature coinciding with the passage of the front, but also a stark difference between high temperatures on Saturday and Sunday.
Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
A strong backdoor cold front moved from northeast to southwest across the area late Saturday afternoon April 15th into Sunday morning April 16th. Not only was there a significant drop in temperature coinciding with the passage of the front, but also a stark difference between high temperatures on Saturday and Sunday. On Saturday, high temperatures ranged from the mid-70s to mid-80s, but only made it to the mid-30s to mid-40s on Sunday. In general, there was a 40 degree temperature drop from Saturday to Sunday!
The backdoor front became stationary south of the region then moved northward as a warm front Sunday night into Monday morning. Meanwhile, a strong cold front approached from the west and swept across the area Monday afternoon and evening, along with an attendant area of low pressure. This robust storm system tapped large amounts of moisture, which was lifted along the warm front as overrunning precipitation, and along the cold front as a line of showers and thunderstorms.
As a result, heavy rainfall occurred across the region. A widespread 1 to 3 inches of rainfall occurred, with localized amounts over 4 inches. This lead to flooding across portions of the area. Meanwhile, it was cold enough in the higher elevations of the Southern Poconos of Northeast Pennsylvania for freezing rain on Sunday. In particular, the Pocono Mountains Airport ASOS recorded 0.19 inches of ice accretion, and there was tree damage and power outages reported in Tobyhanna Pennsylvania.
Along the coast, an extended period of onshore flow occurred, beginning with east-northeast winds Saturday Night, which then shifted to the southeast on Sunday Night into Monday Morning April 16th. By Monday morning and afternoon, tidal flooding made its way up the Delaware River to Philadelphia as a result of the onshore flow.
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 Apr 15, 11:40 PM EST, 50 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
1240 AM EDT Mon Apr 16 2018
.SYNOPSIS...
A strong low pressure system and its associated fronts will
affect the region tonight and Monday. The low will move away
allowing high pressure to build over the area for Monday night
and through Tuesday. A low pressure system and its associated
fronts will affect the area Wednesday through Thursday. An upper
low will remain over the region into Friday. High pressure will
build down across the area from Canada beginning Friday night
and remaining into next weekend.
&&
.NEAR TERM /UNTIL 6 AM THIS MORNING/...
1230 AM Update....For 1230 AM updated, we dropped temps slightly
for the next couple hours as the colder air continues to hold on
over much of the area. Freezing rain continues to be ongoing at
Mount Pocono and based on this and other reports we received we
have issued a Winter Weather Advisory until 8z for Carbon,
Monroe, and Sussex Counties. Expect freezing rain to be most
prevalent above 1500 ft. By late tonight, temps should finally
warm above freezing as the warm front moves north.
930 PM Update...For the 930 PM update, made some minor
adjustments to the hourly temperature and dew point grids
(increased the winds a bit more). A low-level jet above the low-
level wedge of colder air is assisting in lift resulting in
quite a bit of shower activity. This is expected to continue,
then we await the arrival of the frontal forcing very late
tonight from the west and southwest. A mesoanalysis shows a
little bit of instability spreading northward across parts of
Delmarva and south/eastern New Jersey. This is indicated on the
MUCAPE analysis thus far and therefore not enough to result in
lightning production. We therefore removed the thunder for this
evening, and focused it more with the incoming frontal forcing
late tonight and more toward morning.
Some light freezing rain is being reported at Mount Pocono
where the temperature is down to 31 degrees. It appears this
near or slightly below freezing air is above 1800 feet in
elevation, therefore rather localized. No advisory or
statements issued at this time as any light icing should be in
the highest elevations and given the gusty winds any accretion
may be limited (roads should be just wet). Temperatures are
expected to slowly rise from south to north overnight as the
low-level jet works its magic and starts to dislodge the colder
air currently stuck at the surface (surface winds start to veer
from east-northeast to southeast).
Otherwise, high-resolution models place the front in portions
of Delmarva and far southern New Jersey toward daybreak, but do
not have a lot of confidence on this placement. Models tend to
progress these fronts too far northward, and suspect this is the
case here as well. Did slow its progress somewhat from hi-res
model consensus (HRRR/RAP, NAM Nest, WRF-ARW/NMM, RGEM), but not
a whole lot from the previous forecast (not enough confidence
to do that yet). Low-CAPE/high-shear setups are always a
challenge, and the placement of the front and the quite marginal
surface-based instability are certainly adding to the
challenge. Nevertheless, with shear profiles exceptionally good
(given the pronounced veering in the low levels downstream of
the front and resultant very large low-level SRH), sufficient
instability would lead to potential for locally severe storms
toward daybreak.
QPF looks quite substantial during the 06Z to 12Z period, especially
near/northwest of the urban corridor, where 6-hour totals of
0.75-1.5 inches are likely, with locally higher totals probable
with the strongest convective cores and with any training
convection that occurs. See the hydrology section below for more
details.
&&
.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM TUESDAY/...
Front moves through the area early in the day, which is not entirely
favorable for generation of surface-based instability and a more
appreciable severe threat as the strongly-forced convection moves
through. Nevertheless, the degree of shear is large (0-6 km bulk
shear in excess of 60 kts and 0-3 km SRH in excess of 300 J/kg)
near/south of the retreating warm front. Certainly cannot rule out
damaging gusts or even a tornado (though the threat of tornadoes
seems low given the marginal surface-based instability). Main
convective line should move out of the area by late morning.
Threat of training convection and locally heavy rain exists, with an
isolated instance of flash flooding plausible. Flash flood watch
continues through 6 pm, though the threat will likely be over before
then. Main threat appears to be with small streams and in urban
areas, and the timing is concerning given the Monday morning
commute. For these reasons, decided a watch was prudent despite the
somewhat marginal setup. See the hydrology section for more details.
As the surface low scoots to the northeast near/west of the I-95
corridor during the morning, cold air aloft will move into the area
as the midlevel low approaches the region. Instability showers
(perhaps even with thunder) will likely develop upstream of the
convective line by afternoon, as depicted in most all of the
guidance. Maintained chances of this along/northwest of the I-95
corridor in particular, given this area's closer proximity to the
midlevel vort max.
Temperatures will probably begin to fall during the afternoon as
colder air filters in upstream of the cold front. Used solely hi-res
guidance for temperatures during this period, as precipitation
effects, frontal placement, and potential for rapidly changing sky
conditions in the afternoon warrant little use of statistically-
derived guidance.
&&
.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
The strong low which brought the significant weather in the near
and short term portions of the forecast will be N/NE of the region
Monday night. While the fronts will have passed through the area
and all organized precip will be done, there is still the possibility
for some scattered showers under the upper low. We therefore have
slgt chc or low chc pops for the much of the area Monday night and
Tuesday. This scenario is being shown by both the GFS and EC models.
Below normal temperatures are expected this period with lows in the
30s and highs Tuesday only in the mid/upper 40s (north) and low 50s
for the Delaware Valley, srn NJ and Delmarva. Gusty winds 15 to 25
mph expected.
Fair weather is expected from Tuesday night into Wednesday as high
pressure arrives across the area. It will be a bit warmer than
Monday/Tuesday, but still slightly below normal for mid-April.
Highs will generally be in the mid/upper 50s north/west and
low/mid 60s south/east. These values will be 2 o 4 degrees below
normal.
Another low pressure system will approach the area later Wednesday
and last into Thursday evening. The system will be progressive,
so even though the low is depicted by the models as being
rather strong, it will not have alot of moisture to work with.
We therefore have mostly chc pops in the fcst for Wed night/Thu
and slgt chc pops into Thu night. Temperatures will remain
mostly at or a little below normal this period. The warmest day
will be Thursday (near normal) with mid/upper 50s for highs
across the north and low/mid 60s over Delmarva and srn NJ.
High pressure from Canada builds in for late this week and into the
weekend. Mostly fair weather is expected with a continuation of below
normal temperatures.
&&
.AVIATION /06Z MONDAY THROUGH FRIDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.
Tonight through Monday morning...MVFR/IFR (possibly LIFR) with
low clouds and showers. Winds east-northeast 15-20 knots with
gusts near 30 knots, becoming southeasterly early Monday morning.
Southeasterly low-level wind shear (40-55 knots) overnight and
part of Monday morning.
A line of heavy showers and some thunderstorms moves through
the area between about 09Z and 14Z Monday with LIFR conditions,
torrential rain and erratic winds likely as the heaviest
portion of the line moves through. Lightning is anticipated
however the coverage is less certain and therefore a VCTS was
included for now. Conditions are expected to improve slowly to
MVFR after the heavy showers/storms pass. Moderate confidence.
Monday afternoon...Improvement to VFR, though scattered showers may
develop near/northwest of PHL. Winds becoming southwest or west
around 10 knots with gusts to 20 knots. Potential for some erratic
winds/gusts around showers. Moderate confidence.
Outlook...
Mon night thru Wed...VFR. Few showers psbl N/W Mon night/Tue.
Wed night and Thu...Mostly VFR. Sct showers.
Thu night/Fri...VFR expected.
&&
.MARINE...
Gale Warning continues, however winds may remain lighter near buoy
44009.
Models show a relative minimum in wind gusts later this evening
before winds turn southeasterly/southerly and strengthen
overnight through Monday morning. Widespread gales are expected
in advance of a line of heavy showers and storms moving through
the area between 4 AM and noon. Erratic/severe wind gusts and
torrential downpours are possible with these storms.
After the line of storms passes, winds should gradually diminish
from south to north, with small craft advisory conditions likely
during the afternoon on Delaware Bay and the Atlantic Delaware
coastal waters. Gale conditions may linger on the New Jersey coastal
waters for most of the afternoon before conditions improve by
evening.
Outlook...
Monday night/Tuesday morning...Low end SCA conditions.
Tuesday thru Friday...Sub-SCA most of the time. Near SCA seas and
a few showers possible Thursday.
&&
.HYDROLOGY...
QPF looks quite substantial during the 06Z to 12Z period, especially
near/northwest of the urban corridor, where 6-hour totals of 0.75-
1.5 inches are likely, with locally higher totals probable with the
strongest convective cores and with any training convection that
occurs. Flash flood guidance is high, and our thinking is that any
flash flooding threat would be isolated. However, nuisance/urban
flooding is probable, and the timing of the main line of convection
moving through the area (generally after 4 AM) means that impacts to
the morning rush may occur. In coordination with WFOs BGM/OKX,
hoisted a flash flood watch from the Philly metro northward into the
southern Poconos and northern New Jersey from 2 AM to 6 PM Monday,
with the main threat being associated with the primary convective
line moving through late tonight and Monday morning.
Flash flood guidance is on the high side (about 1-2 inches in an
hour) in most of the area (lowest in the urban corridor); however,
with anomalous precipitable water, considerable moisture convergence
via a very strong low-level jet impinging upon the approaching cold
front, and contributions from upslope flow, should any training
convection occur within the main line, 1-hr FFG could be met in
spots.
One of the primary concerns is the timing. With the main convective
line moving through just before or during the morning commute, heavy
rainfall may cause some traffic headaches. The nature of this event
suggests flood issues would be with flashy small streams and in poor-
drainage urban areas. Mainstem river flooding is not anticipated at
this time.
Total forecast rainfall accumulations in the watch area are
generally 1.5-3 inches, with 1-2 inches expected elsewhere (possibly
somewhat lower in the far southern portions of the county warning
area).
&&
.TIDES/COASTAL FLOODING...
Increasing astronomical tides associated with the approaching
new moon in combination with increasing anomolies as the result of
an established onshore flow will be the primary drivers for minor
to moderate flooding along the Mid-Atlantic coast into Monday
afternoon. An offshore wind shift later Monday is then expected
to end the threat of coastal flooding across the area.
A Coastal Flood Warning is in effect for the northern NJ coast
(Middlesex, Monmouth, and Ocean Counties) for the high tide this
evening and the high tide Monday morning. It may turn out that
the inlet areas and coastal streams experience slightly higher
water levels with this system, but the ocean front areas should
approach or exceed established moderate flooding levels as well.
Heading south,anomolies are expected to decrease slightly, so
coastal sections in the southern portions of Ocean County may
only see minor flooding, depending on how all the components of
this weather system play out.
Further south, a Coastal Flood Advisory is in effect for the
remainder of the New Jersey coast (Atlantic and Cape May Counties),
the Delaware coast, and all of Delaware Bay, for the high tides
this evening and Monday morning.
There is also the potential of minor flooding along the Delaware
River and upper Chesapeake Bay. For these locals, there is a
greater concern for the Monday morning high tide cycle, given an
increasing southeasterly flow regime between now and then. We will
continue to monitor this situation and issue later Advisories, if
necessary.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch through this afternoon for PAZ054-055-061-
062-070-071-103>106.
Winter Weather Advisory until 4 AM EDT early this morning for
PAZ054-055.
NJ...Flash Flood Watch through this afternoon for NJZ001-007>010-
012-015-017>019.
Coastal Flood Advisory until 1 PM EDT this afternoon for
NJZ021>025-027.
Coastal Flood Warning until 1 PM EDT this afternoon for
NJZ012>014-020-026.
Coastal Flood Advisory until 2 PM EDT this afternoon for
NJZ016.
Winter Weather Advisory until 4 AM EDT early this morning for
NJZ001.
DE...Coastal Flood Advisory until 1 PM EDT this afternoon for
DEZ002>004.
Coastal Flood Advisory until 2 PM EDT this afternoon for
DEZ001.
MD...None.
MARINE...Gale Warning until 5 PM EDT this afternoon for ANZ450>453.
Gale Warning until 11 AM EDT this morning for ANZ430-431-454-
455.
&&
Synopsis...O'Hara
Near Term...CMS/Fitzsimmons/Gorse
Short Term...CMS
Long Term...O'Hara
Aviation...CMS/Gorse/O'Hara
Marine...CMS/O'Hara
Hydrology...
Tides/Coastal Flooding...Hazardous Weather Outlook National Weather Service Mount Holly NJ 1238 AM EDT Mon Apr 16 2018 NJZ007>010-015-017>019-PAZ061-062-070-071-103>106-170445- Warren-Morris-Hunterdon-Somerset-Mercer-Gloucester-Camden- Northwestern Burlington-Lehigh-Northampton-Delaware-Philadelphia- Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- 1238 AM EDT Mon Apr 16 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON... This Hazardous Weather Outlook is for central New Jersey, northern New Jersey, northwest New Jersey, southern New Jersey, east central Pennsylvania and southeast Pennsylvania. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. MDZ008-012-015-019-020-PAZ101-102-170445- Cecil-Kent MD-Queen Annes-Talbot-Caroline-Western Chester- Eastern Chester- 1238 AM EDT Mon Apr 16 2018 This Hazardous Weather Outlook is for northeast Maryland and southeast Pennsylvania. .DAY ONE...Tonight. A storm system will be affecting the region with showers, gusty winds and possibly a thunderstorms early this morning. Locally heavy rains may cause urban and small stream flooding at times. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ001-PAZ054-055-170445- Sussex-Carbon-Monroe- 1238 AM EDT Mon Apr 16 2018 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM EDT EARLY THIS MORNING... ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON... This Hazardous Weather Outlook is for northern New Jersey and northeast Pennsylvania. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Winter Weather Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ001-NJZ016-170445- New Castle-Salem- 1238 AM EDT Mon Apr 16 2018 ...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for northern Delaware and southern New Jersey. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Advisory. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ013-014-020-026-170445- Western Monmouth-Eastern Monmouth-Ocean-Coastal Ocean- 1238 AM EDT Mon Apr 16 2018 ...COASTAL FLOOD WARNING IN EFFECT UNTIL 1 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for central New Jersey and southern New Jersey. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Warning. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ012-170445- Middlesex- 1238 AM EDT Mon Apr 16 2018 ...COASTAL FLOOD WARNING IN EFFECT UNTIL 1 PM EDT THIS AFTERNOON... ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON... This Hazardous Weather Outlook is for northern New Jersey. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Warning. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ002>004-NJZ021>025-027-170445- Kent-Inland Sussex-Delaware Beaches-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Southeastern Burlington- 1238 AM EDT Mon Apr 16 2018 ...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 1 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for central Delaware, southern Delaware and southern New Jersey. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Advisory. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ060-170445- Berks- 1238 AM EDT Mon Apr 16 2018 This Hazardous Weather Outlook is for east central Pennsylvania. .DAY ONE...Tonight. A storm system will be affecting the region with showers, gusty winds and possibly a thunderstorms early this morning. Locally heavy rains may cause urban and small stream flooding at times. .DAYS TWO THROUGH SEVEN...Monday through Saturday. For rural areas of Berks county, low temperatures will range from the lower to middle 30s on Tuesday night. There is the potential for frost, which may impact sensitive plants. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ430-431-454-455-170445- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 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- 1238 AM EDT Mon Apr 16 2018 ...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING... This Hazardous Weather Outlook is for Atlantic coastal waters and Delaware Bay Waters. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Gale Warning. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ450>453-170445- 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- 1238 AM EDT Mon Apr 16 2018 ...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Gale Warning. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
Special Weather Statement National Weather Service Mount Holly NJ 1018 PM EDT Sun Apr 15 2018 NJZ001-PAZ054-055-160430- Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 1018 PM EDT Sun Apr 15 2018 ...Freezing Rain Possible Through Midnight in the Higher Elevations of the Southern Poconos and Northwest New Jersey... Freezing rain has developed in the highest elevations of the southern Poconos and Northwest New Jersey. This could result in a light coating of ice on elevated surfaces. The temperature is expected to increase late tonight, changing the freezing rain over to rain. Ice accumulation should be mainly confined to elevated surfaces, but spotty ice will be possible on untreated bridges and overpasses as well. Johnson
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1022 PM EDT SUN APR 15 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1005 PM FREEZING RAIN 3 N WANTAGE 41.32N 74.64W
04/15/2018 E0.00 INCH SUSSEX NJ TRAINED SPOTTER
LIGHT COATING ON ELEVATED SURFACES OBSERVED.
&&
EVENT NUMBER PHI1800600
SFJPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1026 PM EDT SUN APR 15 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0257 PM FREEZING RAIN COOLBAUGH TWP 41.18N 75.49W
04/15/2018 E0.00 INCH MONROE PA TRAINED SPOTTER
MINOR ICE IN TREES AND POWER LINES. ELEVATION 1964 FT.
&&
EVENT NUMBER PHI1800601
SFJThe Binghamton radar (KBGM), 138 km away, was scanning. The volume nearest the first event began at 11:32 UTC.
4 flash flood, 3 coastal flood, 1 winter weather, 1 flood. Local standard time, as filed.
The Pocono Mountains Airport recorded 0.29 inches of radial ice accretion due to freezing rain. Radial conversion (0.90 planar accretion). In Tobyhanna, tree damage and multiple power outages were reported due to the ice accretion.
Water rescues took place in the vicinity of Cobbs Creek. A number of small streams and creeks left their banks, including Cobbs Creek and Frankford Creek. The gauge on Cobbs Creek reached 7.09 feet, exceeding its flood stage of 7 feet. The gauge on Frankford Creek reached 7.89 feet, exceeding its flood stage of 7 feet.
Water rescues took place where Mount Alverno Road crosses Chester Creek between Middletown Township and Aston Township. A number of creeks left their banks, including Crum Creek and Chester Creek. The Crum Creek gauge near Newtown Square reached 8.05 feet, exceeding its flood stage of 6 feet. The Chester Creek gauge at Chester reached 10.78 feet, exceeding its flood stage of 8 feet.
A number of small streams and creeks left their banks, including the Wissahickon Creek. The gauge on the Wissahickon Creek peaked at 6.07 feet, exceeding its flood stage of 5 feet.
A number of small streams and creeks left their banks, including Wissahickon Creek. The gauge on the Wissahickon Creek at Fort Washington peaked at 10.93 feet, exceeding its flood stage of 10 feet.
The Neshaminy Creek At Langhorne rose above flood stage of 9.0 feet. The maximum height was 10.29 feet.
Moderate coastal flooding along the tidal Delaware River and its tidal tributaries. Flooding occurred in the Croydon section of Bristol Township with water covering Bank Street, Minot Avenue and Sixth Avenue. Peak tide was 10.61 feet MLLW at Burlington (Burlington County, New Jersey) and 11.37 feet MLLW at Newbold Island.
Moderate coastal flooding along the tidal Delaware River and its tidal tributaries. Flooding occurred along Christopher Columbus Boulevard from Spring Garden Street to below the Ben Franklin Bridge. Peak tide was 9.47 feet MLLW at Philadelphia.
Moderate coastal flooding along the tidal Delaware River and its tidal tributaries. Peak tide was 9.47 feet MLLW at Philadelphia.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2018Every state in 2018This day in weather historyWarnings in Pennsylvania, April 2018
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: 746462, 741926, 741925, 741927, 741928, 746455, 741663, 741664, 741665.