Alert archive / Pennsylvania / Areal Flood Warnings in 2018

Areal Flood Warning 127, NWS Philadelphia/Mount Holly

December 21, 20185 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Dec 21, 2018, 12:15 PM EST for 5 counties in Pennsylvania. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Dec 21, 2018, 12:15 PM EST (17:15 UTC)
Expired
Dec 21, 2018, 3:59 PM EST
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Binghamton radar (KBGM), 149 km from the middle of the area, began a volume at 17:17 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.3 hours before the alert went out and 240 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2018-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2018-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 720 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
437 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
720 m²/s²
0-3 km storm-relative helicity
801 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

875 
WGUS41 KPHI 211715
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1215 PM EST FRI DEC 21 2018

PAC011-025-077-089-095-212115-
/O.NEW.KPHI.FA.W.0127.181221T1715Z-181221T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
1215 PM EST FRI DEC 21 2018

The National Weather Service in Mount Holly NJ has issued a

* Flood Warning for...
  Northwestern Berks County in eastern Pennsylvania...
  Northwestern Lehigh County in eastern Pennsylvania...
  Carbon County in northeastern Pennsylvania...
  Monroe County in northeastern Pennsylvania...
  West central Northampton County in eastern Pennsylvania...

* Until 415 PM EST.

* At 1214 PM EST, Doppler radar indicated the moderate to heavy rain 
  was moving out of the region. Although the widespread rain is 
  coming to an end, more than three inches fell across portions of 
  the warned area. It will take time for this water to drain. As a 
  result, the flood warning has been extended through 415 this 
  afternoon.

* Some locations that could experience flooding include...
  Lehighton, Mount Pocono, East Stroudsburg, Tobyhanna, Palmerton,
  Jim Thorpe, Hamburg, Slatington, Nesquehoning, Womelsdorf,
  Weatherly, Newmanstown, Walnutport, Leesport, Shoemakersville,
  Bernville, Strausstown, Lenhartsville, Stormville and Neffs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means that flooding is imminent or occurring. All
interested parties should take necessary precautions immediately.

&&

LAT...LON 4049 7643 4057 7602 4065 7598 4074 7576
      4091 7599 4101 7573 4109 7577 4112 7564
      4123 7554 4125 7513 4115 7515 4108 7503
      4109 7497 4031 7614

$$

Kruzdlo
1 follow-up statement
355 
WGUS81 KPHI 212059
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
359 PM EST FRI DEC 21 2018

PAC011-025-077-089-095-212108-
/O.CAN.KPHI.FA.W.0127.000000T0000Z-181221T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
359 PM EST FRI DEC 21 2018

...THE FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN BERKS...
NORTHWESTERN LEHIGH...CARBON...MONROE AND WEST CENTRAL NORTHAMPTON
COUNTIES...

The heavy rain has ended. The flood warning has been cancelled.

LAT...LON 4049 7643 4057 7602 4065 7598 4074 7576
      4091 7599 4101 7573 4109 7577 4112 7564
      4123 7554 4125 7513 4115 7515 4108 7503
      4109 7497 4031 7614

$$

Kruzdlo

What forecasters said that day

The local office's own words before this areal flood warning went out, 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 this areal flood warning went out at Dec 21, 9:33 AM EST, 2 hours 42 minutes earlier.

Area forecast discussion, Dec 21, 9:33 AM EST, 2 hours 42 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
933 AM EST Fri Dec 21 2018

.SYNOPSIS...
Low pressure stretched along the Appalachians this morning will move
northward through tonight. An associated cold front will cross our
area by daybreak Saturday. High pressure will build into the region
Saturday into Sunday, then two weak clipper systems may track near
our region Sunday night and Tuesday night. High pressure then builds
in especially for Wednesday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Radar trends and high-res models suggest heavy rainfall will be
confined to the New Jersey coastal areas for the rest of the
morning. Rain will taper to scattered showers from west to east
during the course of the day, and some instability later this
afternoon may support isolated thunder. A rather warm start to the
day with many areas experiencing temperatures into the 60s.

From the 351 AM discussion...
A full-latitude trough from the Midwest to the Gulf of Mexico will
gradually shift eastward today. An intense wind field is associated
with this feature, with a 120-knot 500 mb jet rounding the base of
the trough and starting to lift up the eastern side. The combination
of the robust wind field and strong low-level warm air advection and
short wave energy is resulting in large scale ascent and therefore
periods of rain this morning. An analysis early this morning shows
an axis of precipitable water nearing 2 inches advecting across much
of our region. This will result in times of heavy rain, especially
within any convective elements. There is some weak instability
working northward across Delmarva, and therefore some embedded
thunder is possible this morning especially near and east of I-95.
As the main low-level jet and associated strong warm air advection
lifts north of our area, the rain is expected to lessen and become
more showery by midday especially as a dry slot arrives this
afternoon. The heavy rain can lead to some flooding with some
impacts for the morning commute. Given the strength of the wind
field, the rain/showers are moving quite rapidly therefore this may
lessen the heavy rain threat and reduce any persistent training.
Some training though of heavier cells will result in locally heavier
rain with an enhanced flood threat, and this may be closer to the
coast through about midday.

As we go through the afternoon, some additional showers are expected
however this may shift westward some as the midlevel feature
approaches and the dry slot moves through. Some cooling aloft may
also result in some low-topped convection to our west or southwest
that could arrive into parts of our region later this afternoon into
the early evening. It is not all that clear how much instability
could develop and whether or not it will be enough to result in some
lightning.

The strong wind field coupled with a much warmer boundary layer
across much of the area is resulting in gusty winds. The strongest
winds have been mostly from the Philadelphia metro on south and
eastward, with some gusts to around 50 mph noted earlier. While all
areas within the wind advisory area may not technically reach
criteria, given the robust wind field and mixing we will maintain
the advisory through mid-morning.

As for the temperatures, a rather mild day is expected. A model
blend including the LAMP guidance was used for the hourly
temperatures, and high temperatures are mainly a MOS blend.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/...
The upper-level trough will move across the East tonight and start
to lift out as a 120-knot 500 mb jet lifts up its east side. This
will take deepening surface low pressure into eastern Canada, with
its trailing cold front crossing our area late tonight and early
Saturday morning. Associated with the trough axis and a ribbon of
lift, showers should be more active across the western areas in the
evening then taper off through the night. Cold enough air may not
arrive into the Poconos until after the showers end.

As for Saturday, low pressure moves farther away however a tight
pressure gradient will be present. Some cooling occurs and this will
allow more efficient mixing especially as the boundary layer warms
some. The forecast soundings show about 30 knots of wind present to
mix down, therefore have peak wind gusts very near this. Given the
cyclonic flow and residual moisture, there may be a fair amount of
clouds around until some drier air arrives toward evening. High
temperatures are a multi-model/continuity blend.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
Winds will diminish quickly Saturday evening and into the overnight
hours. Flow aloft turns zonal through the beginning of the week,
however a couple shortwave troughs are forecast to pass quickly
across our region amid this flow regime, one being Sunday night and
the other being Tuesday night. These are expected to bring couple of
clipper systems across the region. At this time, guidance varies on
the intensity and placement of these features and therefore how much
precipitation, if any, they produce. That being said, even the
higher end of the guidance is not very robust with accumulations.
Therefore, kept PoPs considerably low for both systems given lack of
confidence at this point. Thermal profiles will support mostly snow
toward the north and mostly rain toward the south with a rain/snow
mix somewhere along I-95. Sensible weather will remain seasonable
and fair between these systems.

High pressure builds in Wednesday under a ridge amplifying across
the eastern US. This will clear things out for our area and bring in
some colder and drier air. Another shortwave approaches the area
Thursday bringing an increasing chance for showers throughout the
day and the potential for widespread rainfall again by Thursday
night into Friday. Temperatures will remain largely around normal
through the entire extended period.

&&

.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Today...MVFR/IFR ceilings with visibilities varying from VFR to IFR
at times this morning with periods of rain at varying intensity. The
rain becomes more showery through the day and should tend to
decrease in coverage. Some thunder possible this morning and then
again later this afternoon, however the coverage looks to be limited
and therefore not included in the TAFs. Southeast to south winds 10-
15 knots with gusts up to 30 knots (highest especially closer to the
coast), then diminishing by later this morning and through the
afternoon.

Tonight...MVFR/IFR ceilings may improve to VFR for a time with
showers ending. South to southwest winds around 10 knots, becoming
west and increasing some toward daybreak Saturday. Low confidence
regarding the ceiling heights.

Saturday...Mainly VFR and drying out. West-northwest winds winds 15-
20 knots with gusts to around 30 knots.

OUTLOOK... Saturday night...VFR. West-northwest winds diminishing to
10 knots or less.

Sunday and Monday...Mainly VFR. However, some rain and/or snow
showers possible Sunday night into Monday.

Tuesday...VFR expected. However, some light rain and/or snow showers
will be possible Tuesday night.

&&

.MARINE...
A Small Craft Advisory is now in effect for Delaware Bay and the
adjacent Atlantic Coastal waters. The advisory goes through tonight
for now, as there is some potential for some gales during Saturday.

From the 351 AM discussion... Despite a robust wind field, strong
low-level warm air advection is reducing the depth of mixing. Some
coastal wind gusts have been to gale force while farther offshore
the mixing thus far has been less. We will keep the Gale Warning
going for now, expiring from south to north starting at 7 AM.
Locally stronger winds are possible with heavier showers or a
thunderstorm. A Small Craft Advisory will then be needed following
the gales, however there may be a period of low- end gale force
gusts Saturday afternoon.

OUTLOOK... Saturday night...SCA conditions expected through the
evening hours with winds and seas subsiding to below SCA conditions
through the overnight hours.

Sunday and Sunday night...Sub-SCA conditions are expected.

Monday and Monday night...SCA conditions possible later in the
afternoon and evening hours.

Tuesday and Tuesday night...Sub-SCA conditions expected with winds
diminishing through the day.

&&

.HYDROLOGY...
On average, the heaviest precipitation is expected to fall through
early this afternoon. Regardless of model, they all show tropical
connectivity, a convective contribution, and well above normal PW's
for this time of year.

Total rainfall amounts of 1.5-3.0 inches are expected. Locally
higher amounts are possible, especially if any thunderstorms and
training occur. These amounts can be broken down further...1.50 to
2.50 inches south of the PA Turnpike and I-195 in NJ and 2.0 to 3.0
inches to the north.

Rainfall across specific basins...

Passaic - 2.50 to 3.00" Raritan - 2.00 to 3.00" Delaware north of
Trenton - 2.00 to 3.00" Delaware south of Trenton - 1.75 to 2.75"
Schuylkill and the rest of SE PA - 1.75 to 2.00"

Even without thunderstorms, a long duration rainfall event is
expected to lead to significant rises on many local creeks and
streams and even the larger rivers. The latest forecasts from MARFC
indicate that around 15 forecast points/gauges will reach at least
caution stage and a few (namely, Pine Brook, Macopin Dam, Boonton
below the dam, Pemberton, and Blackwells Mills) will reach flood
stage.

The Flood Watch continues. Nuisance poor drainage/low lying flooding
first followed by stream/river flooding, assuming the expected
rainfall comes to fruition. And if river flooding does occur, it
could likely last into the next week.

We fielded questions yesterday regarding our mainstem rivers.
Assuming the expected rainfall comes to fruition, portions of the
Passaic are the most likely to exceed flood stage followed by
portions of the Raritan. As of this afternoon, the heaviest rain is
forecast across the Passaic basin. As a result, moderate to major
flooding is possible. The last time portions of the Passaic River
experienced major flooding was during 2011 with Irene and Lee. The
flooding threat isn't as high for the Schuylkill or Delaware rivers.
At the moment, we are not seeing water levels reaching flood stage
on either river, but we can't rule out some locations getting as
high as action/caution stage.

A bit more regarding the Delaware...although water levels are not
expected to rise to flood stage at this time (signifying widespread
minor flooding), some nuisance flooding would be possible if some
gauges reach caution stage. When the Delaware runs high, it could
hinder/slow down flow on the Lehigh causing water levels to run a
bit higher. This could cause spotty minor flooding near and around
Easton. Further south, River Road in Pohatcong Township on the NJ
side is a low spot that can see some water as could PA 32 in Yardley
Borough.

The main message here is to keep an eye on future forecasts. Our
crests our dependent on rainfall. So if there is a shift in the
heavy rain, flooding will be worse in different locations that we
are currently highlighting (e.g. - the more significant flood
concerns in NJ attm could shift west if the axis of heavier rain
shifts west).

&&

.TIDES/COASTAL FLOODING...
The latest model forecasts continue to show minor to moderate
flooding for most locations on the Atlantic coast, Delaware Bay, and
tidal Delaware River around the time of high tide today. We remain
concerned that models are generally underforecasting tidal levels
during the high tide, as a result of a typical low bias models
exhibit in these regimes and the lack of accounting for expected
rainfall.
The ESTOFS continues to trend higher than the ETSS, and the forecast
remains slightly higher than the ESTOFS because of the above-
mentioned concerns.

The most likely locations to reach moderate flooding are coastal
portions of Middlesex and Monmouth Counties, where a coastal Flood
Warning remains in effect this mornings high tide. Other locations
may require warnings should confidence increase in moderate
flooding; locations of greatest concern are Cape May and Delaware
Bay, given the favorable southeasterly surface flow. For now,
though, a Coastal Flood Advisory remains in effect for the
central/southern New Jersey coast, the Delaware Atlantic coast,
Delaware Bay, and the tidal Delaware River for the Friday daytime
high tide.

For the eastern shores of Chesapeake Bay, minor flooding is still a
possibility, but most models remain under advisory levels during the
high tide Friday.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch through late tonight for PAZ054-055-060>062-070-
     071-101>106.
     Coastal Flood Advisory until 2 PM EST this afternoon for
     PAZ070-071-106.
NJ...Flood Watch through late tonight for NJZ001-007>010-012>027.
     Coastal Flood Advisory until 10 AM EST this morning for
     NJZ020>027.
     Coastal Flood Advisory until 11 AM EST this morning for NJZ016.
     Coastal Flood Advisory until 2 PM EST this afternoon for
     NJZ015-017>019.
     Coastal Flood Warning until 11 AM EST this morning for
     NJZ012>014.
DE...Flood Watch through late tonight for DEZ001>004.
     Coastal Flood Advisory until 10 AM EST this morning for
     DEZ002>004.
     Coastal Flood Advisory until 11 AM EST this morning for DEZ001.
MD...Flood Watch through late tonight for MDZ008-012-015-019-020.
MARINE...Small Craft Advisory until 6 AM EST Saturday for ANZ430-431-
     450>455.

&&

Synopsis...Franklin
Near Term...Franklin
Short Term...Gorse
Long Term...Staarmann
Aviation...Gorse/MPS/Staarmann
Marine...Franklin/Gorse/MPS
Hydrology...
Tides/Coastal Flooding...
Hazardous weather outlook, Dec 21, 11:01 AM EST, 1 hour 14 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
1101 AM EST Fri Dec 21 2018

NJZ001-007>010-PAZ054-055-060>062-101>105-221615-
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks-Lehigh-
Northampton-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-
1101 AM EST Fri Dec 21 2018

...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for northern New Jersey,
northwest New Jersey, east central Pennsylvania, northeast
Pennsylvania and southeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

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

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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.

NJZ015-017>019-PAZ070-071-106-221615-
Mercer-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Lower Bucks-
1101 AM EST Fri Dec 21 2018

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 2 PM EST THIS AFTERNOON...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for central New Jersey, southern
New Jersey and southeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

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

   Flood Watch.
   Coastal Flood Advisory.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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-NJZ016-221615-
New Castle-Salem-
1101 AM EST Fri Dec 21 2018

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL NOON EST TODAY...
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for northern Delaware and
southern New Jersey.

.DAY ONE...This afternoon and tonight.

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

   Flood Watch.
   Coastal Flood Advisory.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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-NJZ012>014-020>027-221615-
Kent-Inland Sussex-Delaware Beaches-Middlesex-Western Monmouth-
Eastern Monmouth-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-
1101 AM EST Fri Dec 21 2018

...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for central Delaware, southern
Delaware, central New Jersey, northern New Jersey and southern New
Jersey.

.DAY ONE...This afternoon and tonight.

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

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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.

MDZ008-012-015-019-020-221615-
Cecil-Kent MD-Queen Annes-Talbot-Caroline-
1101 AM EST Fri Dec 21 2018

...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...This afternoon and tonight.

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

   Flood Watch.

Some minor coastal flooding is possible today.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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>453-221615-
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-
1101 AM EST Fri Dec 21 2018

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This afternoon and tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Gale force wind gusts are possible on Saturday.

.SPOTTER INFORMATION STATEMENT...

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

ANZ430-431-454-455-221615-
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-
1101 AM EST Fri Dec 21 2018

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...This afternoon and tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Gale force wind gusts are possible on Saturday.

.SPOTTER INFORMATION STATEMENT...

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

CMS

In the hours before

Local storm report, Dec 21, 11:21 AM EST, 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1121 AM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1115 AM     FLOOD            2 ESE ROXBOROUGH        39.99N 75.19W
12/21/2018                   PHILADELPHIA       PA   PUBLIC

            KELLY DRIVE EASTBOUND CLOSED BETWEEN
            STRAWBERRY MANSION DRIVE AND FOUNTAIN GREEN
            DRIVE DUE TO FLOODING. REPORT VIA SOCIAL
            MEDIA.

&&

CMS
Local storm report, Dec 21, 11:26 AM EST, 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1126 AM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1115 AM     FLOOD            1 ESE BRANCHBURG TWP    40.56N 74.69W
12/21/2018                   SOMERSET           NJ   OTHER FEDERAL

            THE NORTH BRANCH RARITAN RIVER GAUGE IN
            SOUTH BRANCH REACHED FLOOD STAGE.

&&

CMS
Local storm report, Dec 21, 11:43 AM EST, 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1143 AM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 AM     HEAVY RAIN       2 NNW NEFFS             40.72N 75.63W
12/21/2018  M1.65 INCH       LEHIGH             PA   TRAINED SPOTTER

&&

CMS
Local storm report, Dec 21, 11:46 AM EST, 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1146 AM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1124 AM     FLOOD            1 SSW ANCIENT OAKS      40.54N 75.59W
12/21/2018                   LEHIGH             PA   TRAINED SPOTTER

            SPRING CREEK ROAD CLOSED FROM FLOODING OF
            THE LITTLE LEHIGH CREEK. STORM TOTAL 2.35
            INCHES.

&&

CMS
Local storm report, Dec 21, 12:04 PM EST, 11 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1204 PM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1048 AM     FLOOD            1 ESE MONTEREY FARMS    39.62N 75.63W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            RIVER ROAD CLOSED DUE TO FLOODING BETWEEN
            RTE 72 AND GRANTHAM LN.

1040 AM     COASTAL FLOOD    1 SSW WASHINGTON PARK   39.65N 75.59W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            RIVER ROAD CLOSED BETWEEN CARROLL DRIVE AND
            CLYMER STREET OWING TO TIDAL FLOODING.

1037 AM     FLOOD            ODESSA                  39.45N 75.66W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            ROUTE 299 CLOSED NEAR THE APPOQUINIMINK
            RIVER OWING TO A COMBINATION OF FRESHWATER
            AND TIDAL FLOODING.

1037 AM     FLOOD            3 W WEST WINDSOR TWP.   40.31N 74.68W
12/21/2018                   MERCER             NJ   LAW ENFORCEMENT

            QUAKER ROAD CLOSED FROM FLOODING.

1030 AM     HEAVY RAIN       SOMERS POINT            39.31N 74.60W
12/21/2018  M1.50 INCH       ATLANTIC           NJ   PUBLIC

            VIA SOCIAL MEDIA.

1016 AM     FLOOD            1 SSE WILMINGTON        39.74N 75.55W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            COMBINATION OF FRESHWATER AND TIDAL FLOODING
            IS INUNDATING PORTIONS OF ROUTE 13 AT THE
            WALNUT STREET BRIDGE. LANE RESTRICTIONS IN
            PLACE.

1013 AM     FLOOD            1 SW HAYDEN PARK        39.69N 75.62W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            COMBINATION OF FRESHWATER AND TIDAL FLOODING
            HAS CLOSED AIRPORT ROAD BETWEEN INTERSTATE
            95 AND MCARTHUR DRIVE.

1005 AM     FLOOD            1 WSW ASBURY PARK       40.21N 74.03W
12/21/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            FLOODING ON STATE HIGHWAY 35 NORTH OF STATE
            HIGHWAY 33. ALL LANES CLOSED.

1004 AM     FLOOD            WARETOWN                39.78N 74.20W
12/21/2018                   OCEAN              NJ   DEPT OF HIGHWAYS

            FLOODING ON U.S. HIGHWAY 9 NEAR MAIN STREET.
            LANE RESTRICTIONS IN PLACE.

1002 AM     FLOOD            2 NNW WALL TWP          40.18N 74.07W
12/21/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            FLOODING ON STATE HIGHWAY 18 SOUTHBOUND
            NORTH OF EXIT 6. LANE RESTRICTIONS IN PLACE.

1000 AM     FLOOD            DEAL                    40.25N 74.00W
12/21/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            COMBINATION OF FRESHWATER AND COASTAL
            FLOODING HAS CLOSED STATE HIGHWAY 71 NORTH
            OF BRIGHTON AVENUE.

0930 AM     HEAVY RAIN       EXTON                   40.03N 75.63W
12/21/2018  M1.63 INCH       CHESTER            PA   PUBLIC

0930 AM     FLOOD            CHADDS FORD TWP         39.87N 75.59W
12/21/2018                   DELAWARE           PA   OTHER FEDERAL

            BRANDYWINE CREEK AT CHADDS FORD EXCEEDED
            MINOR FLOOD STAGE OF 9 FEET.

0920 AM     HEAVY RAIN       4 SW WANTAGE            41.20N 74.68W
12/21/2018  M1.10 INCH       SUSSEX             NJ   TRAINED SPOTTER

0850 AM     HEAVY RAIN       SOUTH ALLENTOWN         40.59N 75.48W
12/21/2018  M1.38 INCH       LEHIGH             PA   OFFICIAL NWS OBS

            VIA SOCIAL MEDIA.

0845 AM     FLOOD            1 SE MANAYUNK           40.02N 75.20W
12/21/2018                   PHILADELPHIA       PA   OTHER FEDERAL

            WISSAHICKON CREEK EXCEEDED MINOR FLOOD STAGE
            OF 5 FEET.

0840 AM     HEAVY RAIN       POCONO SUMMIT           41.11N 75.39W
12/21/2018  M3.30 INCH       MONROE             PA   TRAINED SPOTTER

            24 HOUR TOTAL.

0823 AM     FLOOD            1 WSW TIOGA             40.00N 75.19W
12/21/2018                   PHILADELPHIA       PA   PUBLIC

            KELLY DR. BETWEEN FOUNTAIN GREEN DR. AND
            STRAWBERRY MANSION DR. CLOSED DUE TO
            FLOODING.

0818 AM     FLOOD            WESTVILLE               39.87N 75.13W
12/21/2018                   GLOUCESTER         NJ   DEPT OF HIGHWAYS

            FLOODING ON U.S. HIGHWAY 130 NEAR STATE
            HIGHWAY 45. LANE RESTRICTIONS IN PLACE.

0755 AM     FLOOD            1 N HOLMESBURG          40.05N 75.03W
12/21/2018                   PHILADELPHIA       PA   OTHER FEDERAL

            PENNYPACK CREEK AT PHILADELPHIA EXCEEDED
            MINOR FLOOD STAGE OF 7 FEET.

0750 AM     FLOOD            1 N RITTENHOUSE SQUARE  39.96N 75.17W
12/21/2018                   PHILADELPHIA       PA   DEPT OF HIGHWAYS

            FLOODING ON INTERSTATE 676 NEAR BEN FRANKLIN
            PARKWAY. LANE RESTRICTIONS IN PLACE.

0737 AM     FLOOD            1 SW ANCIENT OAKS       40.53N 75.60W
12/21/2018                   LEHIGH             PA   DEPT OF HIGHWAYS

            SPRING CREEK RD. BETWEEN PA-100 AND
            TREXLERTOWN RD. CLOSED DUE TO FLOODING.

0735 AM     FLOOD            1 ENE PAULSBORO         39.83N 75.22W
12/21/2018                   GLOUCESTER         NJ   DEPT OF HIGHWAYS

            FLOODING ON STATE HIGHWAY 44 NEAR PARADISE
            ROAD IN WEST DEPTFORD TWP. LANE RESTRICTIONS
            IN PLACE.

0734 AM     FLOOD            2 SSW MARTINSVILLE      40.58N 74.57W
12/21/2018                   SOMERSET           NJ   DEPT OF HIGHWAYS

            FLOODING ON U.S. HIGHWAY 22 NEAR THE
            INTERSTATE 287 JUNCTION. LANE RESTRICTIONS
            IN PLACE.

0732 AM     FLOOD            1 SSW EDDINGTON         40.07N 74.95W
12/21/2018                   BUCKS              PA   DEPT OF HIGHWAYS

            FLOODING NEAR STATION AVENUE AND STATE ROAD
            IN BENSALEM TWP. SEVERAL ROADS CLOSED.

0725 AM     FLOOD            2 NNE ROCKLEDGE         40.10N 75.08W
12/21/2018                   MONTGOMERY         PA   PUBLIC

            RED LION RD. BETWEEN PINE RD. AND HUNTINGDON
            PIKE CLOSED DUE TO FLOODING.

0712 AM     FLOOD            1 WNW KING OF PRUSSIA   40.09N 75.39W
12/21/2018                   MONTGOMERY         PA   DEPT OF HIGHWAYS

            FLOODING ON INTERSTATE 76 EASTBOUND NEAR
            EXIT 328. LANE RESTRICTIONS IN PLACE.

0642 AM     FLOOD            1 SSE DORCHESTER        39.25N 74.97W
12/21/2018                   CUMBERLAND         NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 47 SOUTHBOUND SOUTH OF CR
            740/MACKEYS LANE.

0637 AM     COASTAL FLOOD    1 ESE BRIELLE           40.10N 74.04W
12/21/2018                   MONMOUTH           NJ   EMERGENCY MNGR

            MINOR FLOODING ON SOUTH RIVERSIDE DRIVE AND
            SOUTH CONCOURSE IN NEPTUNE TWP.

0634 AM     NON-TSTM WND DMG 3 SSE HARMONY           40.71N 75.11W
12/21/2018                   WARREN             NJ   PUBLIC

            TREE DOWN ON LOWS HOLLOW ROAD. REPORT VIA
            SOCIAL MEDIA.

0627 AM     FLOOD            1 SSE PLEASANTVILLE     39.39N 74.52W
12/21/2018                   ATLANTIC           NJ   DEPT OF HIGHWAYS

            FLOODING ON US 40 BOTH DIRECTIONS EAST OF CR
            608/FRANKLIN AVE TO EAST OF DORSET AVE.

0622 AM     FLOOD            1 SSW HEATHCOTE         40.38N 74.58W
12/21/2018                   MIDDLESEX          NJ   DEPT OF HIGHWAYS

            FLOODING ON U.S. HIGHWAY 1 SOUTHBOUND AT
            RAYMOND ROAD. LANE RESTRICTIONS IN PLACE.

0608 AM     COASTAL FLOOD    WILDWOOD                38.99N 74.83W
12/21/2018                   CAPE MAY           NJ   DEPT OF HIGHWAYS

            FLOODING ON STATE HIGHWAY 47 NEAR WEST RIO
            GRANDE AVENUE IN LOWER TWP. LANE
            RESTRICTIONS IN PLACE.

0600 AM     FLOOD            1 S UPPER HANOVER TWP   40.39N 75.52W
12/21/2018                   MONTGOMERY         PA   OTHER FEDERAL

            THE RIVER GAUGE ON PERKIOMEN CREEK IN EAST
            GREENVILLE REACHED FLOOD STAGE.

0545 AM     FLOOD            1 N VILLANOVA           40.05N 75.35W
12/21/2018                   DELAWARE           PA   DEPT OF HIGHWAYS

            FLOODING ON I-476 NORTHBOUND 0.6 MILES NORTH
            OF EXIT 13.

0528 AM     FLOOD            3 NE RIO GRANDE         39.04N 74.84W
12/21/2018                   CAPE MAY           NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 147 WESTBOUND AT MARYLAND
            AVE.

0526 AM     FLOOD            EGG HARBOR CITY         39.53N 74.64W
12/21/2018                   ATLANTIC           NJ   DEPT OF HIGHWAYS

            FLOODING ON US 30 EASTBOUND EAST OF NJ 50/CR
            563.

0523 AM     FLOOD            1 SSW WASHINGTON PARK   39.65N 75.58W
12/21/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            ROUTE 9 CLOSED IN THE DOBBINSVILLE AREA FROM
            FLOODING.

0522 AM     FLOOD            1 NNW WHITE HOUSE STATI 40.63N 74.78W
12/21/2018                   HUNTERDON          NJ   LAW ENFORCEMENT

            U.S. HIGHWAY 22 CLOSED NEAR MERCK DRIVE DUE
            TO FLOODING.

0510 AM     FLOOD            2 SE HONEY BROOK TWP    40.07N 75.86W
12/21/2018                   CHESTER            PA   EMERGENCY MNGR

            WATER RESCUE AT INTERSECTION OF BEAVER DAM
            ROAD AND BIRDELLS ROAD.

0500 AM     FLOOD            3 WSW CLOVERHILL        40.47N 74.83W
12/21/2018                   HUNTERDON          NJ   OTHER FEDERAL

            RIVER GAUGE ON THE NESHANIC RIVER AT
            REAVILLE REACHED FLOOD STAGE.

0451 AM     FLOOD            1 NW BOUND BROOK        40.58N 74.55W
12/21/2018                   SOMERSET           NJ   DEPT OF HIGHWAYS

            FLOODING ON U.S. HIGHWAY 22 WEST OF
            VOSSELLER AVENUE IN BRIDGEWATER TWP. LANE
            RESTRICTIONS IN PLACE.

0445 AM     FLOOD            1 SSW EAST VINCENT TWP  40.15N 75.60W
12/21/2018                   CHESTER            PA   OTHER FEDERAL

            THE RIVER GAUGE ON FRENCH CREEK AT
            PHOENIXVILLE REACHED FLOOD STAGE.

0436 AM     FLOOD            1 SW ANCIENT OAKS       40.53N 75.60W
12/21/2018                   LEHIGH             PA   DEPT OF HIGHWAYS

            FLOODING ON MAIN STREET AND FRANKLIN STREET
            NEAR MILL CREEK ROAD IN LOWER MACUNGIE TWP.
            SEVERAL ROADS IN THE AREA CLOSED.

0430 AM     FLOOD            2 WSW NEWTOWN TWP       39.98N 75.43W
12/21/2018                   DELAWARE           PA   OTHER FEDERAL

            RIVER GAUGE ON CRUM CREEK AT NEWTOWN SQUARE
            REACHED FLOOD STAGE.

0233 AM     FLOOD            1 NNE MARSHALLTON       39.97N 75.67W
12/21/2018                   CHESTER            PA   OTHER FEDERAL

            THE RIVER GAUGE ON THE EAST BRANCH
            BRANDYWINE CREEK AT DOWNINGTOWN REACHED
            FLOOD STAGE.

0136 AM     NON-TSTM WND DMG 2 NE WARREN GROVE       39.78N 74.34W
12/21/2018                   OCEAN              NJ   DEPT OF HIGHWAYS

            DOWNED TREE ON STATE HIGHWAY 72 EAST OF
            WARREN GROVE ROAD IN BARNEGAT TWP. LANE
            RESTRICTIONS IN PLACE.

1253 AM     NON-TSTM WND DMG 1 NNW TROOPER           40.16N 75.41W
12/21/2018                   MONTGOMERY         PA   DEPT OF HIGHWAYS

            DOWNED TREE ON PIKE ROAD NEAR LEVEL ROAD.
            ALL LANES CLOSED.

&&

JEO/CMS
Local storm report, Dec 21, 12:08 PM EST, 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1208 PM EST FRI DEC 21 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1134 AM     FLOOD            1 SE ROXBOROUGH         39.99N 75.21W
12/21/2018                   PHILADELPHIA       PA   PUBLIC

            FLOODING ON MARTIN LUTHER KING JR. DRIVE
            BETWEEN MONTGOMERY DRIVE AND FALLS BRIDGE.
            ROAD CLOSED.

&&

CMS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 21, 3:44 AM ESTRiver Flood WarningPHIChester9 hr
Dec 21, 4:02 AM ESTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia4 hr
Dec 21, 4:09 AM ESTAreal Flood WarningPHIBucks, Lehigh, Northampton16 hr
Dec 21, 4:27 AM ESTAreal Flood WarningPHIBerks, Carbon, Lehigh, Monroe, Northampton8 hr
Dec 21, 4:36 AM ESTAreal Flood WarningPHIBucks, Montgomery, Philadelphia7 hr
Dec 21, 5:10 AM ESTRiver Flood WarningPHIDelaware5 hr
Dec 21, 5:20 AM ESTRiver Flood WarningPHIChester, Delaware14 hr
Dec 21, 8:04 AM ESTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia7 hr
Dec 21, 8:51 AM ESTRiver Flood WarningPHIBucks6 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2018Every areal flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.