A near record warm air mass was in place over the mid-Atlantic on June 30. Combined with fairly high humidity, moderate to strong instability built over the region.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PHI wrote it up.
A near record warm air mass was in place over the mid-Atlantic on June 30. Combined with fairly high humidity, moderate to strong instability built over the region. An approaching surface trough acted to trigger scattered thunderstorms over the area during the afternoon and evening hours. Shear was not very strong, which limited overall storm organization. However, some storms did become strong to severe and produced instances of damaging winds. Convective activity diminished during the later evening hours with the loss of daytime heating.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Jun 30, 6:18 PM EST, 54 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
718 PM EDT Wed Jun 30 2021
.SYNOPSIS...
A surface trough will remain across the east coast through
Thursday, before a cold front settles into the area Thursday
night and shifts offshore by Friday. Several waves of low
pressure will develop along this front and impact the area as it
settles across the area and moves offshore. Several surface
troughs may impact the Mid Atlantic region into early next week,
while high pressure builds across the southeast states. Another
cold front is forecast to impact the area around the middle of
next week.
&&
.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
The Excessive Heat Warning and the Heat Advisory will be
allowed to expire at 8:00 PM as temperatures slowly decrease.
This is the final day of this stretch of excessive heat.
A Severe Thunderstorm Watch remains in effect until 10:00 PM
and it includes the Pennsylvania counties of Berks, Lehigh,
Northampton, Carbon and Monroe, and the New Jersey counties of
Sussex, Warren and Morris.
A positive tilt upper-level trough from eastern Canada to the
Great Lakes is forecast to gradually shift south and eastward
through tonight. The airmass ahead of this feature over our area
is rather unstable with surface-based CAPE (SBCAPE) in the
2000-3000 J/kg range. A zone of 40-50 knots of effective bulk
shear is just to our north, however 30-40 knots now extends
across northeast Pennsylvania and far northern New Jersey. Some
lines of convection are ongoing and will move into our counties
shortly. The low-level convergence is not all that strong,
however strong instability and greater shear is helping to
organize convection to our west. This should hold together in a
linear or clustered fashion, with damaging winds the main threat
especially given the steep low-level lapse rates and higher
DCAPE values into our region. The greatest severe thunderstorm
risk looks to be along or north of I-78.
The convection will be moving fairly quickly given the tendency
for downwind propagation, however it is not as clear how far
south and east the storms get through the evening. Overall, any
convection should be on the decrease late this evening and
beyond owing to nocturnal stabilization. Given the rather
unstable environment and somewhat elevated near-surface winds,
storms may persist longer though than currently expected and
therefore did not lower the PoPs as fast into the overnight. It
will be another very warm and muggy night as we remain ahead of
a cold front.
&&
.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
Summary...The breakdown of the excessive heat starts Thursday,
however increasing showers and thunderstorms with some corridors
of very heavy rain are expected with even flash flooding
possible. Some thunderstorms Thursday afternoon could be severe
with damaging winds the severe main hazard.
As an upper-level trough swings across the Great Lakes and
adjacent Canada, it is forecast to close off. In advance of this
feature, weak surface low pressure tracks to our north with a
cold front slowly arriving into and across our area. A very
moist airmass with precipitable water values near 2 inches will
be in place. This combined with enough instability will result
in showers and thunderstorms quickly developing during the day.
These are expected to become more numerous during the afternoon
and evening as large scale forcing starts to overspread our area
along with an increase in the mid-level flow.
The combination of strengthening low to mid level flow ahead of
the upper-level trough and sufficient instability could result
in a few strong to severe thunderstorms in the afternoon and
evening. As of now, the greatest chance of severe thunderstorms
appears to be across our southern zones where better heating may
take place. Forecast soundings show a mixed boundary layer
resulting in steepening low-level lapse rates. The instability
profile may be skinnier, however there is some potential for
local wet microbursts due to water-loaded downdrafts. Convection
may tend to organize in a linear fashion, which would increase
the local damaging wind potential.
The mid to upper-level flow will be nearly parallel to the cold
front for a while, and given the vertical wind profiles the
convection may train over some areas. Given the high
precipitable water values and strengthening convection with
time, very efficient rainfall rates (around 2 inches per hour)
are quite possible. This would result in at least a local flash
flood threat especially within the urban areas. Given the
potential including more than one round of convection, opted to
issue a Flash Flood Watch for the urban I-95 corridor for
Thursday afternoon through Thursday night. The convection is
expected to gradually be on the decrease during Thursday night
as the airmass stabilizes in the wake of the convection and also
behind the cold front. However, given the continued large scale
forcing, at least some convection may continue through the
entire night. Given cloud cover and increasing convection, heat
indices will be well below advisory/warning criteria Thursday.
&&
.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Unsettled weather will continue into the long term period with
a chance of showers and thunderstorms, especially Friday and
Saturday.
The cold front that moves across the area later on Thursday
will be offshore of the east coast on Friday and slowly shift
eastward into the weekend. Meanwhile, several areas of low
pressure will develop near the area and move along this frontal
boundary Friday into Saturday. As these low pressure systems
move along the front, a couple of surface troughs may develop on
the backside of the lows and move across the Mid Atlantic
region Friday into Saturday. As the mid/upper trough swings into
the region, several short wave/vorticity impulses will move
across the area as well, which will interact with some enhanced
moisture associated with the surface trough across the area.
By Sunday, the low will be pulling farther away from the area,
however, the unsettled weather potential will continue into next
week. The flow aloft will turn to the northwest on Sunday and
Monday, before shifting to the west and become more zonal on
Tuesday. However, with the northwest flow and westerly flow,
several short wave/vorticity impulses will move across the area
each day, which could help contribute to a chance of isolated to
scattered showers and thunderstorms each day as a lee-
side/thermal trough may develop and provide a focus for storms
to form.
By Wednesday, another cold front is forecast to approach the
area from the west and northwest, which could provide another
chance of showers and thunderstorms.
While a cool down is expected Friday, and especially Saturday
with below normal temperatures, temperatures will rebound
Sunday, and return to above normal for Monday through Wednesday.
&&
.AVIATION /23Z WEDNESDAY THROUGH MONDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
This evening...Mainly VFR. However, scattered showers and
thunderstorms through about 04Z may briefing reduce conditions
to MVFR/IFR. Southwest to west wind 5 to 10 knots. Medium
confidence.
Overnight...Mainly VFR with some local visibility and ceiling
restrictions developing. Variable wind 5 knots or less. Medium
confidence.
Thursday...Some early morning visibility and ceiling
restrictions are possible, then mainly VFR for the morning.
Conditions are expected to deteriorate in the afternoon with the
arrival of showers and thunderstorms from the west and
northwest. Wind mainly from the west around 5 to 10 knots.
Medium confidence.
Outlook...
Friday-Friday night...MVFR or IFR conditions expected with
showers and thunderstorms likely, especially during the day
Friday. West winds 5-10 knots, becoming variable during the
evening, then northwest overnight. Locally higher winds near
near thunderstorms. Low confidence.
Saturday-Saturday night...MVFR or IFR conditions with a chance
of showers and thunderstorms, especially during the day. North
to northwest winds 5-10 knots, becoming light and variable
overnight. Locally higher winds near near thunderstorms. Low
confidence.
Sunday-Sunday night...Conditions improve to VFR during the
morning hours Sunday and continue into Sunday night. A chance of
showers and thunderstorms. West to northwest winds 5-10 knots,
with occasional gusts around 15-20 knots during the afternoon,
becoming light and variable overnight. Locally higher winds near
near thunderstorms. Low confidence.
Monday-Monday night...VFR conditions expected. A slight chance
of showers and thunderstorms in the afternoon. West to northwest
winds 5-10 knots early, shifting to southwest during the day.
Locally higher winds near near thunderstorms. Low confidence.
&&
.MARINE...
The conditions are anticipated to be below Small Craft Advisory
criteria through Thursday. Southwesterly winds will increase
for a time through this evening, However gusts should remain
below 25 knots given the hot airmass in place. As a result, kept
seas at 4 feet or less. Showers and thunderstorms will increase
Thursday afternoon and evening.
OUTLOOK...
Friday-Monday...Conditions expected to remain mostly below
advisory levels with wind gusts remaining below 25 knots.
However, seas will linger around 3-4 feet, and may approach 5
feet at times, especially Saturday. There is a chance of showers
and thunderstorms, which may lead to locally higher winds and
waves.
Rip Currents...
South to southwest winds 10 to 20 mph in the surf zone into
this evening with low-to-medium period swell. The more favorably
oriented central/southern New Jersey coast has a MODERATE risk
for rip currents into this evening, while a LOW risk remains for
Delaware and for the Monmouth County coast. Conditions will
likely be quite similar again on Thursday.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Excessive Heat Warning until 8 PM EDT this evening for PAZ070-
071-102-104-106.
Flash Flood Watch from Thursday afternoon through Friday
morning for PAZ070-071-101>106.
Heat Advisory until 8 PM EDT this evening for PAZ054-055-
060>062-101-103-105.
Flash Flood Watch until 11 PM EDT this evening for PAZ071-104.
NJ...Excessive Heat Warning until 8 PM EDT this evening for
NJZ008>010-012-013-015-017>019.
Flash Flood Watch from Thursday afternoon through Friday
morning for NJZ009-010-012-013-015>019.
Heat Advisory until 8 PM EDT this evening for NJZ001-007-014-
016-020-027.
DE...Excessive Heat Warning until 8 PM EDT this evening for DEZ001.
Flash Flood Watch from Thursday afternoon through Friday
morning for DEZ001.
MD...Heat Advisory until 8 PM EDT this evening for MDZ012-015-019-
020.
MARINE...None.
&&
Synopsis...Robertson
Near Term...Gorse/Iovino
Short Term...Gorse
Long Term...Robertson
Aviation...Iovino/Robertson
Marine...Gorse/RobertsonHazardous Weather Outlook National Weather Service Mount Holly NJ 0803 PM EDT Wed Jun 30 2021 DEZ001-020003- New Castle- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for New Castle County in Delaware. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ002-020003- Kent- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Kent County in Delaware. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ003-020003- Inland Sussex- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for inland portions of Sussex County in Delaware. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ004-020003- Delaware Beaches- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal portions of Sussex County in Delaware. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ054-020003- Carbon- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Carbon County in Pennsylvania. .DAY ONE...Through 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...Thursday through Tuesday. 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. PAZ055-020003- Monroe- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Monroe County in Pennsylvania. .DAY ONE...Through 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...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ060-020003- Berks- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Berks County in Pennsylvania. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ061-020003- Lehigh- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Lehigh County in Pennsylvania. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ062-020003- Northampton- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Northampton County in Pennsylvania. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ070-020003- Delaware- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Delaware County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ071-020003- Philadelphia- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Philadelphia County in Pennsylvania. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Several instances of flooding are possible, especially in urban and poor-drainage areas and near vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ101-020003- Western Chester- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for western Chester County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ102-020003- Eastern Chester- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for eastern Chester County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ103-020003- Western Montgomery- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for western Montgomery County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ104-020003- Eastern Montgomery- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for eastern Montgomery County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Several instances of flooding are possible, especially in urban and poor-drainage areas and near vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ105-020003- Upper Bucks- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for upper Bucks County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ106-020003- Lower Bucks- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for lower Bucks County in Pennsylvania. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ001-020003- Sussex- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Sussex County in New Jersey. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ007-020003- Warren- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Warren County in New Jersey. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ008-020003- Morris- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Morris County in New Jersey. .DAY ONE...Through 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...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ009-020003- Hunterdon- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Hunterdon County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ010-020003- Somerset- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Somerset County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ012-020003- Middlesex- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Middlesex County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ013-020003- Western Monmouth- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for western Monmouth County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ014-020003- Eastern Monmouth- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for eastern Monmouth County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ015-020003- Mercer- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Mercer County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ016-020003- Salem- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Salem County in New Jersey. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ017-020003- Gloucester- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Gloucester County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ018-020003- Camden- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Camden County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ019-020003- Northwestern Burlington- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for northwestern Burlington County in New Jersey. .DAY ONE...Through tonight. Dangerously hot conditions could result in heat exhaustion or heat stroke with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ020-020003- Ocean- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for inland portions of Ocean County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ021-020003- Cumberland- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Cumberland County in New Jersey. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ022-020003- Atlantic- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for inland portions of Atlantic County in New Jersey. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ023-020003- Cape May- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Cape May County excluding the Atlantic coast in New Jersey. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ024-020003- Atlantic Coastal Cape May- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal portions of Cape May County in New Jersey. .DAY ONE...Through tonight. There is a moderate risk of rip currents. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. There is a moderate risk of rip currents on Thursday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ025-020003- Coastal Atlantic- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for coastal portions of Atlantic County in New Jersey. .DAY ONE...Through tonight. There is a moderate risk of rip currents. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. There is a moderate risk of rip currents on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ026-020003- Coastal Ocean- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for coastal portions of Ocean County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. There is a moderate risk of rip currents. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. There is a moderate risk of rip currents on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ027-020003- Southeastern Burlington- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for southeastern Burlington County in New Jersey. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. MDZ012-020003- Kent MD- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Kent County in Maryland. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. MDZ015-020003- Queen Annes- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Queen Annes County in Maryland. .DAY ONE...Through tonight. Hot conditions could result in heat exhaustion with prolonged exposure. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. MDZ019-020003- Talbot- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Talbot County in Maryland. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. MDZ020-020003- Caroline- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Caroline County in Maryland. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Several instances of flooding are possible on Thursday, especially in urban and poor-drainage areas and near particularly vulnerable small creeks and streams. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ430-020003- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for upper Delaware Bay. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ431-020003- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for lower Delaware Bay. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ450-020003- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Monmouth County out 20 nm. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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. ANZ451-020003- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Ocean County out 20 nm. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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. ANZ452-020003- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Atlantic County out 20 nm. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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. ANZ453-020003- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Cape May County out 20 nm. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ454-020003- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to the mouth of Delaware Bay out 20 nm. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. ANZ455-020003- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 0803 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Sussex County out 20 nm. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered severe thunderstorms are possible on Thursday. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
Special Weather Statement
National Weather Service Mount Holly NJ
703 PM EDT Wed Jun 30 2021
PAZ060-302345-
Berks-
703 PM EDT Wed Jun 30 2021
...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT BERKS COUNTY...
At 702 PM EDT, strong thunderstorms were clustered over Myerstown,
moving northeast at 40 mph.
Wind gusts up to 35 mph are possible with these storms.
Locations impacted include...
Reading, Wyomissing, Kutztown, Hamburg, Fleetwood, Sinking Spring,
Laureldale, Womelsdorf, Wernersville, Topton, Robesonia, Leesport,
Shoemakersville, Bernville, Lyons, Strausstown, Lenhartsville, Spring
Ridge, Fairview Hgts and Shillington.
This includes Interstate 78 in Pennsylvania between mile markers 10
and 43.
If outdoors, consider seeking shelter inside a building.
LAT...LON 4052 7634 4052 7625 4056 7609 4058 7606
4057 7602 4063 7600 4067 7591 4045 7555
4025 7606 4036 7621 4037 7623 4049 7643
TIME...MOT...LOC 2302Z 242DEG 34KT 4038 7636
POSpecial Weather Statement
National Weather Service Mount Holly NJ
753 PM EDT Wed Jun 30 2021
NJZ008-010030-
Morris-
753 PM EDT Wed Jun 30 2021
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MORRIS COUNTY...
At 752 PM EDT, a strong thunderstorm was located over Morris Plains,
or over Morristown, moving northeast at 25 mph. Downpours and wind
gusts up to 35 mph are possible.
Locations impacted include...
Morristown, Dover, Madison, Florham Park, East Hanover, Lincoln Park,
Kinnelon, Boonton, Butler, Wharton, Rockaway, Morris Plains, Mountain
Lakes, Riverdale, Victory Gardens, Parsippany, Pequannock Township,
Succasunna-Kenvil, White Meadow Lake and Hanover Township.
This includes the following highways...
Interstate 80 in New Jersey between mile markers 36 and 48.
Interstate 287 in New Jersey between mile markers 31 and 54.
LAT...LON 4091 7434 4088 7434 4086 7432 4082 7434
4079 7437 4076 7437 4071 7452 4087 7463
4101 7435 4100 7430 4097 7428 4092 7429
4090 7427
TIME...MOT...LOC 2352Z 240DEG 24KT 4082 7450
POThe Philadelphia radar (KDIX), 94 km away, was scanning. The volume nearest the first event began at 00:12 UTC.
14 thunderstorm wind. Local standard time, as filed.
Trees and wires were downed near Harrisburg School Rd. Time estimated from radar.
Trees and wires were downed near Sterner Mill Rd. Time estimated from radar.
Trees and wires were downed near Thatcher Rd. Time estimated from radar.
A tree was downed on Kriebel Rd near Bustard Rd. Time estimated from radar.
Several reports of downed trees and wires near North Ridge Rd. Time estimated from radar.
Trees and wires were downed near Dublin Pike and 5th St. Time estimated from radar.
Trees and wires were downed near Old New Rd. Time estimated from radar.
Trees and wires were downed near Carter Place. Time estimated from radar.
Trees and wires were downed near Dublin Rd. Time estimated from radar.
Trees and wires were downed near Cheyney Rd. Time estimated from radar.
Trees and wires were downed near Atwood Rd. Time estimated from radar.
A tree was downed on Taylorsville Rd. Time estimated from radar.
Downed wires and power outages were reported near Miller St. Time estimated from radar.
Tree limbs were downed near Cobalt Ridge Dr. Time estimated from radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2021Every state in 2021This day in weather historyWarnings in Pennsylvania, June 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 957529, 957528, 957530, 957534, 957521, 957531, 957522, 957523, 957532, 957524, 957525, 957533, 957526, 957527.