Alert archive / New Jersey / Special Marine Warnings in 2017

Special Marine Warning 87, NWS Philadelphia/Mount Holly

July 14, 2017

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 14, 2017, 4:25 PM EDT. It was in force for 95 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
Jul 14, 2017, 4:25 PM EDT (20:25 UTC)
Expired
Jul 14, 2017, 6:00 PM EDT
In force
95 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
40.0 mph

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 20:27 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.4 hours before the alert went out and 176 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, Wallops Is Stn, VA at 12:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 908 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, Wallops Is Stn, VA at 12:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.1939Sfc1 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
908 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
959 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

758 
WHUS51 KPHI 142025
SMWPHI
ANZ451>453-471>473-142200-
/O.NEW.KPHI.MA.W.0087.170714T2025Z-170714T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
425 PM EDT FRI JUL 14 2017

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
 
  COASTAL AND OUTER WATERS FROM MANASQUAN INLET TO CAPE MAY NJ...

* UNTIL 600 PM EDT

* AT 425 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED 9 NM NORTH OF
  GREAT EGG INLET...MOVING SOUTHEAST AT 20 KNOTS.

  HAZARD...WIND GUSTS TO 40 KNOTS AND LARGE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND 
           SUDDENLY HIGHER WAVES. LARGE HAIL COULD RESULT IN 
           STRUCTURAL DAMAGE. 

* LOCATIONS IMPACTED INCLUDE...
  ATLANTIC CITY...LITTLE EGG REEF...ATLANTIC CITY REEF...LITTLE EGG
  INLET...BUOY GE...GREAT EGG INLET...BRIGANTINE...GREAT EGG REEF AND
  OCEAN CITY REEF.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY UNTIL THIS STORM PASSES.
WIND GUSTS TO 40 KNOTS...LARGE HAIL...HIGH WAVES...DANGEROUS 
LIGHTNING... AND HEAVY RAIN ARE POSSIBLE WITH THIS STORM.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FOR
SOUTHERN NEW JERSEY.

LAT...LON 3893 7425 3926 7466 3927 7465 3932 7475
      3932 7472 3940 7475 3944 7470 3938 7470
      3935 7469 3933 7464 3938 7459 3937 7454
      3947 7446 3947 7443 3952 7446 3951 7451
      3954 7450 3957 7453 3941 7382
TIME...MOT...LOC 2025Z 297DEG 21KT 3944 7461 

HAIL...>.75IN
WIND...40KTS

$$

ROBERTSON

What forecasters said that day

The local office's own words before this special marine 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 special marine warning went out at Jul 14, 4:05 PM EDT, 20 minutes earlier.

Area forecast discussion, Jul 14, 4:05 PM EDT, 20 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
405 PM EDT Fri Jul 14 2017

.SYNOPSIS...
A cold front will move through the region late tonight into
Saturday morning. This front will stall off the Carolina coast
through this remainder of the weekend while high pressure builds
in from the Midwest. An area of low pressure develops along the
stalled boundary and starts to move northward into our area
late Monday and Tuesday. High pressure will build into the
region for Wednesday. Another cold front will slowly drop down
from the north on Thursday.

&&

.NEAR TERM /THROUGH TONIGHT/...
A 1012 mb surface low was analyzed near the eastern shore of
Lake Ontario in central NY. The frontal structure of this system
included a cold front that extended southwestward from the low
across the Ohio Valley a warm front that extended to the south
into central PA and curved to the east across near the PA-DE
border and adjacent southern NJ.

The focus for the active weather has shifted farther south than
yesterday by only about 50 miles, which includes far SE PA, S NJ and
Delmarva. The main concerns through this evening will be locally
heavy rainfall/flash flooding and severe thunderstorms although the
the heat will also be an issue in mid Delmarva until storms arrive
late in the day.

Severe Thunderstorm Watch #414 is in effect for SE PA, including
Philadelphia, as well as S NJ, E MD and DE through 9 PM. A line
of strong storms are already starting to organize near the
differential heating boundary/stationary front in southern PA.
Strong heating south of the front has resulted in a moderately
unstable airmass with MLCAPE ranging from around 1000 J/kg in
far SE PA and adjacent S NJ to 2000+ J/kg over the mid Delmarva,
per SPC mesoanalysis. It is these areas along and south of the
warm front that will be conducive for severe thunderstorms.
Expect to see pockets of damaging winds within the line segments
that move across the Watch area. Similar to yesterday, there may
be a brief spin up with storms that track along the stationary
front, where winds are backed out of the SE and E.

A Flash Flood Watch for portions of SE PA, S NJ, NE MD and DE
through midnight. These locations will be closest the frontal
boundary, where the focus for convection will be later this
afternoon and evening. An increasingly stable boundary layer
farther north into NE PA and N NJ will have a tough time
supporting deeper convective updrafts needed for heavy rainfall
rates and flash flooding. Poor drainage flooding is still a
possibility though.

A Heat Advisory is in effect for central and southern DE and
adjacent eastern Maryland. Temperatures are close to forecast
but dewpoints are several degrees higher (mid to upper 70s vs
forecast in the low to mid 70s). Observed heat indices are in
the 100-105F range as of 2 PM this afternoon.

Expect storm intensity to gradually diminish toward sunset this
evening. However, like yesterday, expect at least scattered
showers and storms to continue after dark, particularly where
the residual unstable airmass has not been worked over from
prior convection. Widely scattered leftover showers and isolated
thunderstorms were advertised along and east of I-95 for the
overnight.

Additional convection may reach NE PA and NW NJ close to
midnight. This is in association with a line of showers and
storms that has developed along the cold front in central NY
this afternoon. Hi-res CAM guidance are in general agreement
with these showers and storms weakening after dark and
eventually dissipating overnight before it the Fall Line.

Otherwise, low clouds will persist through much of the night
across eastern PA and much of NJ as a result of continued
onshore flow to the north of the front. Any breaks in the cloud
cover that occur where it has rained this afternoon could lead
to the development of fog tonight. Fog is currently expected to
be patchy in coverage.

Forecast low temperatures are in the middle 60s across NE PA and
NW NJ and lower 70s from Philadelphia southward.

&&

.SHORT TERM /SATURDAY/...
The frontal boundary that has been linger over the area for the
past few days will finally move off the coast on Saturday as
high pressure builds in from the Midwest. W-NW winds behind the
front will advect drier air into the region. This should result
in low clouds gradually clearing from west to east during the
day.

A delayed arrival of the drier air as well as the passage of a
mid-level shortwave trough could allow for isolated showers to
develop during the morning and possible early afternoon in the
coastal plain of S NJ and Delmarva.

Forecast high temperatures are in the 70s in the southern
Poconos and mid to upper 80s across the rest of the area.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
Saturday night and Sunday...The cold front drops stalls off the
Carolina coast, where it remains through the rest of the
weekend. Weak high pressure will build into our area for the
weekend, keeping us dry for at least a couple of days. Might be
a bit cloudy to start the weekend off but overall skies will
become mostly to partly sunny across the region. With drier air
in place, it should feel pretty comfortable outside even with
highs reaching into the mid to upper 80s.

Monday through Tuesday...A low pressure system will develop
along the stalled boundary to our south and will start to move
northward on Monday. The models continue to show the low moving
up through Virginia on Monday and then into Delmarva and through
southern New Jersey on Tuesday. The low then pushes to the
north and east of our area late Tuesday into Wednesday. A chance
for showers and thunderstorms will exist as the surface low
makes its way into our area. A surface trough also develops
across our area again and this would provide a good source of
lift, promoting convective activity. In addition, an upper level
trough will build across the Mid- Atlantic. This will help to
deepen the southerly flow into our region as the atmosphere
becomes more unstable. Best timing for convection, at this
juncture, looks to be mainly during the afternoon and evening
hours.

Wednesday through Thursday...High pressure will build in behind
the departing low with clearing expected for Wednesday. The
upper trough slides to the east during this time. A cold front
will start to drop down from the north on Thursday. As the high
builds in, we will see a return to more of a west to southwest
flow, ushering in some warmer, and moister, air to the region.
Highs will start to creep back up and into the upper 80s to
lower 90s by Wednesday and then into the l ow to mid 90s for
Thursday. Increasing moisture will also mean increased humidity
across the area. Seems reasonable that some showers and
thunderstorms may develop during the afternoon and evening on
both days but location of activity is too difficult to pinpoint
this far out.

&&

.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

IFR conditions with low clouds have held strong at PHL, PNE and
TTN with these terminals situated north of a stationary front.
Breaks in the clouds farther south have resulted in the
development of strong thunderstorms. Based on 1930Z radar, these
storms have a direct path through ILG-MIV-ACY over the next few
hours. Torrential downpours and strong winds with these storms
could bring a period of near zero visibility and peak wind
gusts of 30-50 kt.

It is expected that the low clouds and IFR CIGs will linger
into tonight from PHL northward. It is less clear if these low
clouds makes it into ILG, MIV or ACY as they should be situated
on the southern edge of the stratus deck near the stationary
front. Even if the stratus doesn't make it that far south, fog
could contribute to flight restrictions, especially overnight.

CIGs should lift during the mid to late morning on Saturday as
the front moves off the coast. There is still uncertainty
regarding how quickly they improve but latest thinking is
improvement to VFR occurs from west to east between 14Z and 18Z.

Winds 5-10 kt will vary from NE across the northern terminals to
SE across the southern terminals through sunset. An easterly
component to the winds is favored for tonight but they could
become light and variable in spots. Winds then shift out of the
west and northwest between 7 and 12 kt on Saturday in wake of a
cold fropa.

OUTLOOK...

Sunday...VFR conditions expected. Light northwest winds early,
becoming south to southeast around 10 knots or less.

Monday through Wednesday...Mainly VFR conditions expected.
Afternoon showers and thunderstorms with MVFR or lower
conditions possible. South to southeast winds around 10 knots.

&&

.MARINE...
A stalled frontal boundary is forecast will remain near the DE
Bay and adjacent coastal waters through tonight before a cold
front moves in from the NW on Saturday.

Anybody on the coastal Atlantic waters south of Little Egg
Inlet and in the Delaware Bay is strongly encouraged to pay
close attention to Special Marine Warnings that are issued.
These storms contain strong winds, hail and dangerous lightning,
which could threaten boaters that do not take shelter. Storms
should generally weaken after dark but the threat for at least
isolated storms will linger into the night.

Easterly winds 5-10 kt with gusts to 15 kt has allowed seas to
build to 3-4 ft with a few buoys approaching 5 ft. Winds should
back slightly out of the E-SE late tonight but remain at these
speeds.

A wind shift from the west will occur behind a cold front on
Saturday morning. Winds and seas will remain below SCA criteria.

OUTLOOK...
Saturday night through Wednesday...Sub-Small Craft Advisory
conditions are expected on the area waters. Locally strong
winds may accompany thunderstorms Monday through Wednesday,
especially during the afternoon and evening hours.

RIP CURRENTS...
There risk for the development of dangerous rip currents were
increased to moderate for this afternoon at the NJ shore, where
an onshore flow has lead to an increase in surf to 3 to 4 ft.
The risk is low for Delaware this afternoon.

A low risk is anticipated for Saturday along the NJ and DE
coasts.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch until midnight EDT tonight for PAZ060-070-
     071-101>104.
NJ...Flash Flood Watch until midnight EDT tonight for NJZ016>018-
     021>025.
DE...Flash Flood Watch until midnight EDT tonight for DEZ001-002.
     Heat Advisory until 8 PM EDT this evening for DEZ002-003.
MD...Flash Flood Watch until midnight EDT tonight for MDZ008-012-
     015.
     Heat Advisory until 8 PM EDT this evening for MDZ012-015-019-
     020.
MARINE...None.

&&

Synopsis...Meola/Klein
Near Term...Klein
Short Term...Klein
Long Term...Meola/Klein
Aviation...Klein/Meola
Marine...Klein/Meola
Hazardous weather outlook, Jul 14, 3:10 PM EDT, 1 hour 15 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
310 PM EDT Fri Jul 14 2017

PAZ060-103-104-151915-
Berks-Western Montgomery-Eastern Montgomery-
310 PM EDT Fri Jul 14 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

This Hazardous Weather Outlook is for east central 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.

   Flash 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.

NJZ001-007>010-012-013-015-PAZ054-055-061-062-105-106-151915-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Mercer-Carbon-Monroe-Lehigh-Northampton-Upper Bucks-Lower Bucks-
310 PM EDT Fri Jul 14 2017

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

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

DEZ002-MDZ012-015-151915-
Kent-Kent MD-Queen Annes-
310 PM EDT Fri Jul 14 2017

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for central Delaware and
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.

   Heat Advisory.
   Severe Thunderstorm Watch.
   Flash Flood Watch.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

DEZ001-MDZ008-NJZ016>018-021>023-PAZ070-071-101-102-151915-
New Castle-Cecil-Salem-Gloucester-Camden-Cumberland-Atlantic-
Cape May-Delaware-Philadelphia-Western Chester-Eastern Chester-
310 PM EDT Fri Jul 14 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for northern Delaware, northeast
Maryland, 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.

   Flash Flood Watch.
   Severe Thunderstorm 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.

DEZ003-MDZ019-020-151915-
Inland Sussex-Talbot-Caroline-
310 PM EDT Fri Jul 14 2017

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southern Delaware and
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.

   Heat Advisory.
   Severe Thunderstorm 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.

DEZ004-NJZ019-020-027-151915-
Delaware Beaches-Northwestern Burlington-Ocean-
Southeastern Burlington-
310 PM EDT Fri Jul 14 2017

...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southern 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.

   Severe Thunderstorm 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.

NJZ014-151915-
Eastern Monmouth-
310 PM EDT Fri Jul 14 2017

This Hazardous Weather Outlook is for central New Jersey.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter Activation is not expected.

NJZ026-151915-
Coastal Ocean-
310 PM EDT Fri Jul 14 2017

...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for 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.

   Severe Thunderstorm Watch.

There is a moderate risk of rip currents through this evening.

.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.

NJZ024-025-151915-
Atlantic Coastal Cape May-Coastal Atlantic-
310 PM EDT Fri Jul 14 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for 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.

   Flash Flood Watch.
   Severe Thunderstorm Watch.

There is a moderate risk of rip currents through this evening.

.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.

ANZ430-431-452>455-151915-
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 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-
310 PM EDT Fri Jul 14 2017

...SEVERE THUNDERSTORM WATCH 414 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

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

.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.

   Severe Thunderstorm 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.

ANZ450-451-151915-
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-
310 PM EDT Fri Jul 14 2017

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

In the hours before

Special weather statement, Jul 14, 4:00 PM EDT, 25 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
400 PM EDT FRI JUL 14 2017

MDZ015-019-020-142045-
Queen Anne's-Talbot-Caroline-
400 PM EDT FRI JUL 14 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN TALBOT...SOUTH
CENTRAL QUEEN ANNE'S AND CENTRAL CAROLINE COUNTIES...

At 400 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Romancoke to near Copperville.
Movement was northeast at 15 mph.

Winds up to 50 mph and half inch hail are possible with these storms.

These storms will be near...
  Copperville around 405 PM EDT.
  Skipton around 435 PM EDT.
  Wye Mills around 440 PM EDT.
  Queen Anne, Starr, Cordova and Jumptown around 445 PM EDT.

Other locations impacted by these storms include Hillsboro.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is 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 3886 7626 3883 7625 3881 7621 3879 7622
      3879 7619 3880 7620 3883 7619 3890 7620
      3891 7625 3891 7621 3893 7622 3905 7603
      3885 7578 3877 7625 3883 7629
TIME...MOT...LOC 2000Z 240DEG 14KT 3889 7626 3885 7622

Drag
Local storm report, Jul 14, 4:02 PM EDT, 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
402 PM EDT FRI JUL 14 2017

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

0345 PM     TSTM WND GST     MANNINGTON TWP          39.63N  75.41W
07/14/2017  M55 MPH          SALEM              NJ   MESONET

&&

EVENT NUMBER PHI1700988

SFJ
Special weather statement, Jul 14, 4:05 PM EDT, 20 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
405 PM EDT FRI JUL 14 2017

MDZ008-012-015-142045-
Queen Anne's-Cecil-Kent-
405 PM EDT FRI JUL 14 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN QUEEN
ANNE'S...KENT AND SOUTHEASTERN CECIL COUNTIES...

At 405 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Riverside to Newtown to North Point State
Park. Movement was east at 25 mph.

Winds up to 40 mph are possible with these storms.

These storms will be near...
  Newtown around 410 PM EDT.
  Betterton around 415 PM EDT.
  Kennedyville and Morgnec around 420 PM EDT.
  Crumpton around 430 PM EDT.
  Cecilton and Massey around 440 PM EDT.
  Chestertown, Hollywood Beach, Sassafras, Cayots, Warwick and
  Bohemias Mills around 445 PM EDT.

Other locations impacted by these storms include Chesapeake City,
Kingstown and Galena.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is 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 3926 7622 3929 7617 3932 7618 3934 7616
      3933 7614 3937 7611 3937 7606 3943 7599
      3946 7601 3952 7598 3954 7578 3929 7576
      3920 7606 3920 7625
TIME...MOT...LOC 2005Z 267DEG 23KT 3950 7623 3931 7613 3923 7645

Drag
Local storm report, Jul 14, 4:13 PM EDT, 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
413 PM EDT FRI JUL 14 2017

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

0245 PM     TSTM WND DMG     1 NW MAPLE GROVE        39.77N  75.95W
07/14/2017                   CHESTER            PA   BROADCAST MEDIA

            TREE DOWN BLOCKING HICKORY HILL ROAD. TIME ESTIMATED
            FROM RADAR.

&&

EVENT NUMBER PHI1700989

SFJ
Local storm report, Jul 14, 4:17 PM EDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
417 PM EDT FRI JUL 14 2017

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

0320 PM     FLOOD            LOWER OXFORD TWP        39.81N  75.99W
07/14/2017                   CHESTER            PA   911 CALL CENTER

            SEVERAL ROAD CLOSURES REPORTED IN THE AREA OF LOWER
            OXFORD TOWNSHIP

&&

EVENT NUMBER PHI1700990

SFJ
Local storm report, Jul 14, 4:20 PM EDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
420 PM EDT FRI JUL 14 2017

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

0245 PM     TSTM WND DMG     WEST CHESTER            39.96N  75.61W
07/14/2017                   CHESTER            PA   TRAINED SPOTTER

            DAMAGE TO CAR WINDOWS.

0245 PM     TSTM WND DMG     PHOENIXVILLE            40.13N  75.52W
07/14/2017                   CHESTER            PA   BROADCAST MEDIA

            WIRES DOWN ON STARR ROAD.

0245 PM     TSTM WND DMG     1 NW MAPLE GROVE        39.77N  75.95W
07/14/2017                   CHESTER            PA   BROADCAST MEDIA

            TREE DOWN BLOCKING HICKORY HILL ROAD. TIME ESTIMATED
            FROM RADAR.

0320 PM     FLOOD            LOWER OXFORD TWP        39.81N  75.99W
07/14/2017                   CHESTER            PA   911 CALL CENTER

            SEVERAL ROAD CLOSURES REPORTED IN THE AREA OF LOWER
            OXFORD TOWNSHIP

0345 PM     TSTM WND GST     MANNINGTON TWP          39.63N  75.41W
07/14/2017  M55 MPH          SALEM              NJ   MESONET

0346 PM     HAIL             BUENA VISTA TWP         39.54N  74.88W
07/14/2017  M1.00 INCH       ATLANTIC           NJ   CO-OP OBSERVER

            WITH A PEAK GUST TO 41 MPH.

0350 PM     MARINE TSTM WIND DELAWARE CITY           39.58N  75.60W
07/14/2017  M43 MPH          NEW CASTLE         DE   WEATHERFLOW

&&

EVENT NUMBER PHI1700984 PHI1700985 PHI1700989 PHI1700990 PHI1700988
PHI1700986 PHI1700987

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 8:17 PM EDTSpecial Weather StatementPHICamden43 min
Jul 13, 8:26 PM EDTSpecial Weather StatementPHICape May34 min
Jul 13, 8:27 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more4 hr
Jul 13, 8:49 PM EDTSpecial Weather StatementPHICumberland26 min
Jul 13, 8:51 PM EDTSpecial Weather StatementPHIAtlantic54 min
Jul 13, 9:07 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Gloucester, Salem53 min
Jul 13, 9:46 PM EDTSpecial Weather StatementPHIAtlantic14 min
Jul 13, 9:50 PM EDTSpecial Marine WarningPHI115 min
Jul 13, 9:57 PM EDTSpecial Weather StatementPHICape May33 min
Jul 13, 10:42 PM EDTSpecial Marine WarningPHI93 min
Jul 14, 7:21 AM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren3 hr
Jul 14, 11:40 AM EDTFlash Flood WatchPHIAtlantic, Camden, Cape May, Cumberland, Gloucester, Salem11 hr
Jul 14, 2:57 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more3 hr
Jul 14, 3:07 PM EDTSpecial Marine WarningPHI53 min
Jul 14, 3:18 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem12 min
Jul 14, 3:23 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem67 min
Jul 14, 3:25 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Cumberland, Gloucester, Ocean, Salem4 hr
Jul 14, 3:34 PM EDTFlash Flood WarningPHIGloucester, Salem3 hr
Jul 14, 3:35 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland, Gloucester55 min
Jul 14, 3:43 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Salem47 min
Jul 14, 3:47 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Ocean3 hr
Jul 14, 3:54 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem66 min
Jul 14, 4:12 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May63 min
Jul 14, 4:13 PM EDTFlash Flood WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more3 hr
Jul 14, 4:18 PM EDTSpecial Marine WarningPHI57 min
Jul 14, 4:44 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Gloucester, Salem61 min
Jul 14, 4:54 PM EDTSpecial Marine WarningPHI66 min
Jul 14, 5:47 PM EDTSpecial Weather StatementPHICape May13 min
Jul 14, 5:53 PM EDTSpecial Marine WarningPHI52 min
Jul 14, 6:32 PM EDTSpecial Marine WarningPHI88 min
Jul 14, 7:08 PM EDTSpecial Marine WarningPHI97 min
Jul 14, 7:28 PM EDTAreal Flood AdvisoryPHIAtlantic, Camden, Cape May, Cumberland, Gloucester, Salem3 hr
Jul 14, 12:30 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Montgomery, Northampton4 hr
Jul 14, 1:58 PM EDTSpecial Weather StatementPHIChester62 min
Jul 14, 2:14 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia3 hr
Jul 14, 2:31 PM EDTSevere Thunderstorm WarningPHIChester, Delaware59 min
Jul 14, 2:53 PM EDTFlash Flood WarningPHIChester, Delaware, Montgomery, Philadelphia3 hr
Jul 13, 10:03 PM EDTSpecial Weather StatementPHICaroline27 min
Jul 13, 10:15 PM EDTAreal Flood AdvisoryPHICaroline, Talbot4 hr
Jul 14, 9:23 AM EDTSpecial Weather StatementPHICecil37 min
Jul 14, 12:06 PM EDTHeat AdvisoryPHICaroline, Kent, Queen Anne's, Talbot7 hr
Jul 14, 2:46 PM EDTAreal Flood AdvisoryPHICecil3 hr
Jul 14, 3:10 PM EDTFlash Flood WarningPHICecil2 hr
Jul 14, 3:52 PM EDTFlash Flood WarningPHITalbot53 min
Jul 14, 3:57 PM EDTFlash Flood WarningPHICecil, Kent2 hr
Jul 14, 4:00 PM EDTSpecial Weather StatementPHICaroline45 min
Jul 14, 4:05 PM EDTSpecial Weather StatementPHIKent40 min
Jul 14, 4:48 PM EDTSpecial Weather StatementPHIQueen Anne's27 min
Jul 14, 4:59 PM EDTFlash Flood WarningPHIQueen Anne's4 hr
Jul 14, 5:27 PM EDTSpecial Weather StatementPHIQueen Anne's63 min
Jul 14, 5:40 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot65 min
Jul 14, 5:54 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot51 min
Jul 14, 5:58 PM EDTFlash Flood WarningPHITalbot3 hr
Jul 14, 6:10 PM EDTFlash Flood WarningPHICaroline3 hr
Jul 14, 6:20 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot40 min

Nearby

Special Marine Warnings in New Jersey, 2017Every special marine warning in 2017

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.