Alert archive / New Jersey / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

August 18, 2018Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 18, 2018, 3:34 PM EDT for Sussex County, New Jersey. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 18, 2018, 3:34 PM EDT (19:34 UTC)
Expired
Aug 18, 2018, 4:15 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 19:34 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, 7.6 hours before the alert went out and 138 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 2018-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1148 joules per kilogram.LCLLFCEL10008507005003002001001 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 2018-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.193958Sfc1 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
1148 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
752 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted.

052 
WWUS81 KPHI 181934
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT SAT AUG 18 2018

NJZ001-008-182015-
Morris-Sussex-
334 PM EDT SAT AUG 18 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN MORRIS AND
NORTHEASTERN SUSSEX COUNTIES...

At 333 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Vernon Valley to Branchville. Movement
was east at 25 mph.

Winds up to 45 mph are possible with these storms.

Locations impacted include...
Franklin, Hamburg, Ogdensburg, Sussex, Branchville, Green Pond,
Pellettown, Highland Lake, Vernon Valley and Upper Greenwood Lake.

Brief torrential downpours are occurring with this storm, and may 
cause localized flooding in poor drainage areas. Do not drive your 
vehicle through flooded roadways.

Cloud to ground lightning is also occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe 
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4120 7437 4110 7449 4105 7449 4104 7450
      4105 7445 4102 7443 4103 7442 4101 7435
      4099 7454 4115 7482 4129 7454
TIME...MOT...LOC 1933Z 292DEG 20KT 4125 7450 4114 7474 

$$

JRK

What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 18, 1:46 PM EDT, 1 hour 48 minutes earlier.

Area forecast discussion, Aug 18, 1:46 PM EDT, 1 hour 48 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
146 PM EDT Sat Aug 18 2018

.SYNOPSIS...
A cold front will move into the region today and this evening,
stalling just south of our area Sunday. Several waves of low
pressure will move along the stalled boundary through the
weekend and into early next week. The stalled front will lift
northward as a warm front on Tuesday, followed by a cold front
on Wednesday. High pressure will build in from the west from
Thursday through the end of the week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Another day of potential heavy rainfall and flooding as several
rounds of showers and thunderstorms will move across the area.

Scattered showers and thunderstorms are starting to develop
across the region this afternoon as we are seeing more breaks in
the clouds and better surface heating taking place. There seems
to be decent flow at the surface at this time which is helping
to keep these cells moving and not hanging out for too long in
one place. Additionally, SPC has placed parts of our area in a
marginal risk for sever weather with the main threat being from
potentially damaging winds.

The main threat for heavy rainfall will begin this afternoon
into this evening as a cold front approaches the area from the
northwest. Showers and thunderstorms are expected to become more
widespread as the front approaches and moves across the area.
With PW values remaining around 2 inches, heavy rainfall will
likely occur. Those areas that received heavy rainfall on
Friday, as well as the more urbanized I-95 corridor will be
particularly susceptible to flash flooding. Therefore we have
issued a Flash Flood Watch for eastern Pennsylvania, much of New
Jersey, and northern Delaware and Maryland; basically along and
north of the I-95 corridor.

There will be plenty on instability for thunderstorms to
develop across the area through today. However, there is limited
shear and the flow aloft is fairly weak. So while there could
be a few strong thunderstorms, mainly due to the instability, we
do not expect much in the way of severe weather this afternoon.

Before the cold front and showers/thunderstorms approach later
this afternoon, temperatures will warm well into the mid-upper
80s, and low 90s for some areas. However, heat index values are
not expected to reach advisory levels at this time across the
area.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SUNDAY/...
Heavy showers and thunderstorms will be ongoing across the area
this evening as a cold front moves across the area. However, as
the cold front continues to move southward through the evening
and overnight, shower and thunderstorm activity is expected to
wane some. Therefore the Flash Flood Watch will remain in effect
through midnight. While the shower activity wanes overnight, it
showers may not completely drop off as there will continue to
be a couple of more short wave/vorticity impulses overnight. So
we will keep a chance of showers and thunderstorms through the
night, although the threat for flooding diminishes overnight.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
Sunday through Monday...The cold fronts forward progress starts
to slow down by Sunday and the front will stall over or just
south of our area. For now, the guidance keeps the front just
south of the region but there is potential for it to wobble a
bit as it remains nearby through Monday.

Several waves of low pressure will travel along the stalled boundary
on Sunday and Monday. This will keep us in a now very familiar and
unsettled pattern to end the weekend and start the week. A chance
for showers and thunderstorms will exist through Monday, with the
potential for heavy rainfall to occur as PWATs remain around 2
inches on Sunday. Expect PWATs to decrease some for Monday, down to
around 1.25-1.50 inches as some drier air pushes down from the north
in response to high pressure building across New England. Conditions
across the region remain fairly wet as we have not had very many
days where significant drying can occur. So this will once again
mean that there will be the potential for flooding across our
already saturated region.

An upper trough will dig down and move through the region late
Sunday through Monday. Some cooler air will be brought southward and
that should help to keep Sunday cooler than it has been of late.
However, it is short lived as the airmass will start to modify and
warm for Monday. Highs in the upper 70s to low 80s on Sunday, some
mid 80s possible in southern Delaware due to the proximity to the
stalled boundary. Generally expect highs in the lower 80s for
Monday.

Tuesday through Wednesday...An area of low pressure will start to
organize over the Midwestern states and track towards the Great
Lakes region early in the week. As this low makes its move towards
upstate New York/eastern Canada, it will start to push the stalled
boundary to the north as a warm front.

There is not a lot of instability on Tuesday as the front moves
through. However, PWATs remain high and the lift from the front may
be just enough to allow for some convection to develop. Will
continue to mention a slight chance for thunder through Tuesday.

The low continues to pull northward into eastern Canada and as it
moves along, it will drag a cold front towards and then through our
region on Wednesday. A secondary front may push through the region
later on Wednesday. The bulk of the moisture looks to be tied to the
primary cold front so not expecting much precipitation to occur with
the second frontal passage.

Thursday and Friday...High pressure will start to push eastward and
into our area on Thursday. Expect conditions to dry out for the end
of the week. However, the only fly in the ointment is the location
of the front that moved through the area on Wednesday. Guidance
shows the boundary stalling offshore which could keep the chance for
some showers mainly across our southern and coastal areas.

&&

.AVIATION /17Z SATURDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

This afternoon through tonight...Mainly VFR conditions will
continue into the early afternoon before showers and
thunderstorms develop as cold front approaches from the west.
The majority of showers and storms will be along or just ahead
of the front as it cross the region this evening. Best timing
for storms at the terminals will be 18-22Z (KABE, KRDG), 21-02Z
(KTTN, KPNE, KPHL, KILG), and 00-04Z (KMIV, KACY). Conditions in
showers and thunderstorms will drop to MVFR, possibly IFR at
times, as they cross the terminals.

Winds today will generally be out of the southwest around 10
knots through this afternoon, turning more westerly into this
evening.

Overnight...Generally VFR conditions are expected behind the
cold front and once showers and thunderstorms have come to an
end. Ceilings will start to lower becoming MVFR, possibly IFR,
by early morning. Winds turn more to the northwest then north
before becoming light overnight. The light overnight winds will
help to contribute to fog development overnight.

Sunday...MVFR/IFR conditions expected through much of Sunday.
Easterly flow around 5 to 10 knots with gusts up to 20 knots
possible. A chance for more showers through the day with
isolated thunderstorms possible, mainly from KPHL and south.
Winds will start off light out of the northeast before turning
more to the east through the day.

Outlook...
Sunday night through Monday...Chance for showers and
thunderstorms with MVFR/IFR conditions possible. Light winds
through the overnight period with northeast around 5 to 10
knots through Monday.

Tuesday...Chance for showers and isolated thunderstorms with
MVFR/IFR conditions possible. East to southeast winds around 5 to 10
knots.

Wednesday...Chance for showers and thunderstorms with MVFR/IFR
conditions possible. West to southwest winds around 5 to 10 knots
with gusts up to 20 knots possible.

&&

.MARINE...
Conditions expected to remain below advisory levels today and
tonight across the area. Multiple rounds of showers and
thunderstorms will occur through today and tonight which will
lead to locally higher winds and waves.

A cold front will move across the area this evening and tonight
which will shift winds to the northwest then northeast
overnight with gusts around 20 knots possible.

Outlook...

Sunday...Seas and winds will increase as a boundary remains
stalled south of the area waters. Winds may gust near 25 knots
Sunday afternoon. Seas will rise to near 5 feet by mid morning
on Sunday. A Small Craft Advisory may be needed. Additionally, a
chance for showers and thunderstorms will produce locally
higher winds and waves.

Monday...Seas are expected to subside early and remain below 5 feet
through Monday. Winds will remain below Small Craft Advisory
criteria.

Tuesday through Wednesday...Conditions expected to remain below
Small Craft Advisory Criteria. Winds may gust around 20 knots
through the afternoons on each day.

Rip Currents...

A low risk for the formation of dangerous rip currents is expected
to continue today. However, lightning will be a concern through
the day as well.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch until midnight EDT tonight for PAZ054-055-
     060>062-070-071-101>106.
NJ...Flash Flood Watch until midnight EDT tonight for NJZ001-
     007>010-012>020-026-027.
DE...Flash Flood Watch until midnight EDT tonight for DEZ001.
MD...Flash Flood Watch until midnight EDT tonight for MDZ008.
MARINE...None.

&&

Synopsis...Meola
Near Term...Robertson/Meola
Short Term...Robertson
Long Term...Meola
Aviation...Meola
Marine...Robertson/Meola
Hazardous weather outlook, Aug 18, 3:56 AM EDT, 11 hours 38 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
356 AM EDT Sat Aug 18 2018

DEZ001-MDZ008-NJZ001-007>010-012>020-026-027-PAZ054-055-060>062-070-
071-101>106-190800-
New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Coastal Ocean-Southeastern Burlington-
Carbon-Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia-
Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
356 AM EDT Sat Aug 18 2018

...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
THIS EVENING...

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

.DAY ONE...Today and 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...Sunday through Friday.

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-MDZ012-015-019-020-NJZ021>025-190800-
Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen Annes-Talbot-
Caroline-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-
Coastal Atlantic-
356 AM EDT Sat Aug 18 2018

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

.DAY ONE...Today and Tonight.

Heavy showers and thunderstorms are possible later this afternoon and
this evening which could lead to some localized flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

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.

ANZ430-431-450>455-190800-
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 Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
356 AM EDT Sat Aug 18 2018

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

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

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.

In the hours before

Local storm report, Aug 18, 9:48 AM EDT, 5 hours 46 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
948 AM EDT SAT AUG 18 2018

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

0600 PM     TSTM WND DMG     BATH                    40.73N  75.39W
08/17/2018                   NORTHAMPTON        PA   TRAINED SPOTTER

            TWO TREES DOWNED.

0600 PM     TSTM WND GST     BATH                    40.73N  75.39W
08/17/2018  M62 MPH          NORTHAMPTON        PA   TRAINED SPOTTER

0600 PM     TSTM WND DMG     MOORE TWP               40.78N  75.43W
08/17/2018                   NORTHAMPTON        PA   SOCIAL MEDIA

            SEVERAL REPORTS OF DOWNED TREES AND POWER LINES IN
            MOORE TWP...ALLEN TWP...AND CHAPMAN. TIME ESTIMATED FROM
            RADAR.

0603 PM     TSTM WND DMG     ROSS COMMON             40.87N  75.30W
08/17/2018                   MONROE             PA   DEPT OF HIGHWAYS

            TREES DOWNED IN WIRES. TIME ESTIMATED FROM RADAR.

0603 PM     TSTM WND DMG     BUSHKILL TWP            40.79N  75.34W
08/17/2018                   NORTHAMPTON        PA   TRAINED SPOTTER

            MULTIPLE REPORTS OF TREES AND WIRES DOWN IN BUSHKILL
            TOWNSHIP

0611 PM     TSTM WND DMG     1 ESE ROSS COMMON       40.86N  75.29W
08/17/2018                   NORTHAMPTON        PA   DEPT OF HIGHWAYS

            DOWNED UTILITY ON BROADWAY STREET BETWEEN THE MONROE
            COUNTY LINE AND ROUTE 33 NORTH. ALL LANES CLOSED. TIME
            ESTIMATED FROM RADAR.

0618 PM     TSTM WND DMG     1 WNW HARMONY           40.75N  75.15W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            SEVERAL REPORTS OF TREE DAMAGE NEAR AND NORTHWEST OF
            HARMONY NEAR THE DELAWARE RIVER. TIME ESTIMATED FROM
            RADAR.

0630 PM     TSTM WND DMG     UPPER MOUNT BETHEL TWP  40.90N  75.17W
08/17/2018                   NORTHAMPTON        PA   SOCIAL MEDIA

            SEVERAL TREES DOWN IN UPPER MOUNT BETHEL TWP AND EAST
            BANGOR. TIME ESTIMATED FROM RADAR.

0634 PM     TSTM WND DMG     BELVIDERE               40.83N  75.07W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            REPORTS OF A FEW TREES AND LARGE BRANCHES DOWN IN
            BELVIDERE. TIME ESTIMATED FROM RADAR.

0645 PM     TSTM WND DMG     1 S NORTH HEIDELBERG    40.38N  76.14W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN - SNYDER DR. AND QUARRY RD.

0649 PM     TSTM WND DMG     1 SSW BERNVILLE         40.42N  76.12W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN ON CHRISTMAS VILLAGE ROAD NEAR FAIRWAY DRIVE.
            TIME ESTIMATED FROM RADAR.

0649 PM     TSTM WND DMG     TILDEN TWP              40.53N  76.04W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            SEVERAL REPORTS OF DOWNED TREES AND MALFUNCTIONING
            TRAFFIC LIGHTS IN TILDEN TWP. TIME ESTIMATED FROM RADAR.

0650 PM     TSTM WND DMG     SHILLINGTON             40.30N  75.97W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN BLOCKING TRAFFIC. TIME ESTIMATED FROM RADAR.

0652 PM     TSTM WND DMG     SPRING TWP              40.30N  76.03W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE FELL ONTO HOUSE - JEFFERSON ST.

0657 PM     TSTM WND DMG     PERRY TWP               40.51N  75.94W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN - BELLEVUE AVE.

0657 PM     TSTM WND DMG     PERRY TWP               40.51N  75.94W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            SEVERAL REPORTS OF TREES DOWN IN PERRY TWP...INCLUDING
            NEAR SCHAPPELL ROAD AND MERKEL LANE AND ON GRANDVIEW
            ROAD.

0659 PM     TSTM WND DMG     1 SSW RIVER VIEW PARK   40.39N  75.97W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            DOWNED TREE AT INTERSECTION OF ARNOLD ROAD AND LEISCZS
            BRIDGE ROAD.

0702 PM     TSTM WND DMG     ALSACE TWP              40.39N  75.86W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN OLEY RD.

0712 PM     TSTM WND DMG     REXTOWN                 40.75N  75.65W
08/17/2018                   LEHIGH             PA   FIRE DEPT/RESCUE

            TREE DOWN ON EAST GRANT STREET IN WASHINGTON TWP,
            FORCING THE TEMPORARY CLOSURE OF THE ROAD. TIME
            ESTIMATED FROM RADAR.

0722 PM     TSTM WND DMG     1 WNW HEREFORD          40.45N  75.57W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN AT SEISHOLTZVILLE ROAD AND CHICKADEE LANE.

0737 PM     TSTM WND DMG     1 SSE KIRCHBERG         40.58N  75.31W
08/17/2018                   NORTHAMPTON        PA   SOCIAL MEDIA

            REPORT OF TREES DOWN IN LOWER SAUCON TWP. TIME
            ESTIMATED FROM RADAR.

0742 PM     TSTM WND DMG     1 WNW BROOKVIEW         40.35N  75.67W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            TREE DOWN AT SAWMILL ROAD AND HAUSEMAN ROAD IN
            COLEBROOKDALE TWP. TIME ESTIMATED FROM RADAR.

0750 PM     TSTM WND DMG     EASTON                  40.69N  75.22W
08/17/2018                   NORTHAMPTON        PA   SOCIAL MEDIA

            TREE AND WIRES DOWN IN EASTON. TIME ESTIMATED FROM
            RADAR.

0802 PM     FLOOD            1 SSE BERKLEY           40.42N  75.93W
08/17/2018                   BERKS              PA   SOCIAL MEDIA

            LEESPORT AVENUE FLOODED.

0807 PM     TSTM WND DMG     1 NE BELVIDERE          40.84N  75.06W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            DOWNED TREE NEAR INTERSECTION OF RT. 46 AND MANUNKA
            CHUNK RD. TIME ESTIMATED FROM RADAR.

0817 PM     TSTM WND DMG     1 NE PENWELL            40.79N  74.90W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            TREE DOWN NEAR INTERSECTION OF RT 57 AND WATTERS RD.
            TIME ESTIMATED FROM RADAR.

0819 PM     TSTM WND DMG     1 NE BEATTYESTOWN       40.83N  74.84W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            DOWNED TREE NEAR INTERSECTION OF ALLEN ROAD AND
            SUNNYVIEW AVENUE IN MANSFIELD TWP. ANOTHER DOWNED TREE
            AT ROUTE 57 NEAR WATTERS ROAD. TIME ESTIMATED FROM
            RADAR.

0819 PM     TSTM WND DMG     WASHINGTON              40.76N  74.98W
08/17/2018                   WARREN             NJ   SOCIAL MEDIA

            SEVERAL REPORTS OF LARGE TREES DOWN IN WASHINGTON
            TWP...INCLUDING ON BRASS CASTLE ROAD AND ON BARTELY
            ROAD. TIME ESTIMATED FROM RADAR.

0823 PM     TSTM WND DMG     HAMPTON JUNCTION        40.71N  74.95W
08/17/2018                   HUNTERDON          NJ   SOCIAL MEDIA

            TREES DOWN ONTO WIRES. WIRES DOWNED.

0835 PM     TSTM WND GST     LEBANON                 40.64N  74.84W
08/17/2018  E65 MPH          HUNTERDON          NJ   TRAINED SPOTTER

0850 PM     TSTM WND DMG     FAR HILLS               40.69N  74.62W
08/17/2018                   SOMERSET           NJ   911 CALL CENTER

            REPORT OF TREES DOWN IN FAR HILLS AND BRIDGEWATER
            TOWNSHIP. TIME ESTIMATED FROM RADAR.

0905 PM     TSTM WND DMG     GREEN BROOK TWP         40.60N  74.48W
08/17/2018                   SOMERSET           NJ   911 CALL CENTER

            REPORT OF SOME TREES DOWN. TIME ESTIMATED FROM RADAR.

1145 PM     FLOOD            1 N PLUCKEMIN           40.66N  74.64W
08/17/2018                   SOMERSET           NJ   911 CALL CENTER

            REPORT OF MINOR FLOODING ON 287 NORTHBOUND AT MILE
            MARKER 22. TIME ESTIMATED FROM RADAR.

1200 AM     FLOOD            1 S PLUCKEMIN           40.63N  74.64W
08/18/2018                   SOMERSET           NJ   COCORAHS

            CONSIDERABLE STREAM, ROAD, AND FIELD FLOODING. CHAMBERS
            BROOK OVERFLOWING. MEASURED 2.34 INCHES IN 3.5 HOURS.

1200 AM     HEAVY RAIN       SOMERSET AIRPORT        40.62N  74.67W
08/18/2018  M2.38 INCH       SOMERSET           NJ   ASOS

            1.62 INCHES MEASURED BETWEEN 11 PM AND MIDNIGHT.

1200 AM     HEAVY RAIN       1 NE GREEN KNOLL        40.61N  74.59W
08/18/2018  M2.52 INCH       SOMERSET           NJ   MESONET

            HADS SENSOR AT MARTINSVILLE.

1208 AM     HEAVY RAIN       BASKING RIDGE           40.71N  74.55W
08/18/2018  M2.03 INCH       SOMERSET           NJ   TRAINED SPOTTER

0255 AM     TSTM WND GST     SEASIDE HEIGHTS         39.94N  74.08W
08/18/2018  M61 MPH          OCEAN              NJ   NJWXNET

0257 AM     TSTM WND GST     SEASIDE HEIGHTS         39.94N  74.08W
08/18/2018  M49 MPH          OCEAN              NJ   WEATHERFLOW

0359 AM     MARINE TSTM WIND TRIXIES                 39.87N  74.14W
08/18/2018  M55 MPH          OCEAN              NJ   WXFLOW

&&

EVENT NUMBER PHI1801363 PHI1801364 PHI1801383 PHI1801367 PHI1801371
PHI1801380 PHI1801376 PHI1801381 PHI1801382 PHI1801370 PHI1801384
PHI1801392 PHI1801366 PHI1801365 PHI1801369 PHI1801390 PHI1801389
PHI1801368 PHI1801375 PHI1801387 PHI1801379 PHI1801385 PHI1801391
PHI1801386 PHI1801388 PHI1801374 PHI1801377 PHI1801378 PHI1801372
PHI1801373 PHI1801400 PHI1801401 PHI1801402 PHI1801394 PHI1801395
PHI1801396 PHI1801393 PHI1801398 PHI1801397 PHI1801399

SFJ
Local storm report, Aug 18, 2:45 PM EDT, 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
245 PM EDT SAT AUG 18 2018

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

0213 AM     MARINE TSTM WIND 1 SSE WILMINGTON        39.71N  75.52W
08/18/2018  M39 MPH          ANZ430             DE   MESONET

            PORT OF WILMINGTON

0254 AM     MARINE TSTM WIND 1 NNE SEASIDE PARK      39.93N  74.08W
08/18/2018  M41 MPH          OCEAN              NJ   MESONET

0257 AM     MARINE TSTM WIND 1 ENE BARNEGAT LIGHT    39.76N  74.09W
08/18/2018  M39 MPH          ANZ451             NJ   WEATHERFLOW

0405 AM     TSTM WND GST     SEASIDE PARK            39.91N  74.08W
08/18/2018  M66 MPH          OCEAN              NJ   MESONET

&&

EVENT NUMBER PHI1801403
EVENT NUMBER PHI1801404
EVENT NUMBER PHI1801405
EVENT NUMBER PHI1801406

JRK
Special weather statement, Aug 18, 3:20 PM EDT, 14 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
320 PM EDT SAT AUG 18 2018

MDZ008-PAZ101-102-182000-
Cecil-Western Chester-Eastern Chester-
320 PM EDT SAT AUG 18 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN CECIL AND
SOUTHWESTERN CHESTER COUNTIES...

At 320 PM EDT, a strong thunderstorm was located over Quarryville, or
11 miles southeast of Willow Street, moving east at 25 mph.

Winds up to 45 mph are possible with this storm.

This storm will be near...
  Glen Roy around 330 PM EDT.
  Mount Vernon around 335 PM EDT.
  Oxford and Homeville around 340 PM EDT.
  Parkesburg and Cochranville around 345 PM EDT.
  West Grove around 355 PM EDT.
  Ladenberg and North Star around 400 PM EDT.

Other locations impacted by this storm include Toughkenamon, South
Coatesville, Modena, Avondale, Thorndale, Atglen and Christiana.

Torrential downpours are occurring with this storm, and may cause
localized flooding in poor drainage areas. Do not drive your vehicle
through flooded roadways.

Frequent cloud to ground lightning is also occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3974 7612 3973 7610 3976 7606 3981 7603
      3983 7604 3987 7599 3994 7598 3995 7600
      3999 7597 4003 7574 3979 7572 3972 7579
      3965 7582 3972 7612
TIME...MOT...LOC 1920Z 266DEG 23KT 3986 7614

JRK
Special weather statement, Aug 18, 3:34 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT SAT AUG 18 2018

NJZ001-008-182015-
Morris-Sussex-
334 PM EDT SAT AUG 18 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN MORRIS AND
NORTHEASTERN SUSSEX COUNTIES...

At 333 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Vernon Valley to Branchville. Movement
was east at 25 mph.

Winds up to 45 mph are possible with these storms.

Locations impacted include...
Franklin, Hamburg, Ogdensburg, Sussex, Branchville, Green Pond,
Pellettown, Highland Lake, Vernon Valley and Upper Greenwood Lake.

Brief torrential downpours are occurring with this storm, and may
cause localized flooding in poor drainage areas. Do not drive your
vehicle through flooded roadways.

Cloud to ground lightning is also occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4120 7437 4110 7449 4105 7449 4104 7450
      4105 7445 4102 7443 4103 7442 4101 7435
      4099 7454 4115 7482 4129 7454
TIME...MOT...LOC 1933Z 292DEG 20KT 4125 7450 4114 7474

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:17 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren43 min
Aug 17, 8:47 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex43 min
Aug 17, 8:48 PM EDTSpecial Weather StatementPHISussex27 min
Aug 17, 9:26 PM EDTSpecial Weather StatementPHIMercer, Middlesex, Somerset34 min
Aug 17, 10:59 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Morris, Somerset, Warren75 min
Aug 17, 11:25 PM EDTSpecial Weather StatementPHISomerset35 min
Aug 17, 11:30 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
Aug 17, 11:41 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Morris, Somerset34 min
Aug 17, 11:52 PM EDTSpecial Weather StatementPHIMiddlesex23 min
Aug 18, 12:56 AM EDTAreal Flood AdvisoryPHIGloucester, Salem4 hr
Aug 18, 2:37 AM EDTSpecial Weather StatementPHIOcean23 min
Aug 18, 2:38 AM EDTSpecial Marine WarningPHI52 min
Aug 18, 2:41 AM EDTSpecial Weather StatementPHIAtlantic, Cumberland34 min
Aug 18, 2:46 AM EDTSevere Thunderstorm WarningPHIOcean14 min
Aug 18, 3:15 AM EDTSpecial Marine WarningPHI30 min
Aug 18, 3:16 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more20 hr
Aug 18, 3:40 PM EDTSmall Craft AdvisoryPHI45 hr
Aug 18, 4:14 PM EDTSpecial Weather StatementPHISussex46 min
Aug 18, 4:33 PM EDTSpecial Weather StatementPHIGloucester42 min
Aug 18, 5:16 PM EDTSpecial Weather StatementPHIBurlington, Camden44 min
Aug 18, 5:44 PM EDTAreal Flood AdvisoryPHIBurlington, Camden98 min
Aug 18, 5:55 PM EDTSpecial Weather StatementPHIBurlington35 min
Aug 18, 6:17 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean43 min
Aug 18, 6:31 PM EDTSpecial Marine WarningPHI119 min
Aug 18, 6:44 PM EDTSevere Thunderstorm WarningPHIOcean29 min
Aug 17, 8:04 PM EDTSpecial Weather StatementPHIMonroe41 min
Aug 17, 8:54 PM EDTSpecial Weather StatementPHICarbon, Monroe36 min
Aug 18, 3:20 PM EDTSpecial Weather StatementPHIChester40 min
Aug 18, 4:54 PM EDTSpecial Weather StatementPHIPhiladelphia21 min

Nearby

Special Weather Statements in New Jersey, 2018Every special weather statement 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.