A hot and humid air mass remained in place over the mid-Atlantic on August 27. A slow moving cold front began dropping southward into the region during the afternoon.
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 hot and humid air mass remained in place over the mid-Atlantic on August 27. A slow moving cold front began dropping southward into the region during the afternoon. This helped scattered to widespread convection develop in a strongly unstable air mass. Shear was weak over the region, but thanks to the strong instability, a number of storms became strong to severe with a threat for damaging downburst winds, in addition to locally heavy rain. Convection continued into the late evening hours before gradually waning in coverage as instability was lost.
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 Aug 27, 8:32 AM EST, 3 hours 1 minute earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
932 AM EDT Fri Aug 27 2021
.SYNOPSIS...
High pressure remains off the Mid-Atlantic coast. A cold front
approaches from the north and west later today. It passes south
through the region tonight through Saturday, then becomes
stationary over the Mid-Atlantic. Another area of high pressure
builds in from the north and parks over the Canadian Maritimes.
That front lifts north as a warm front Sunday night, and then
another cold front passes through the region Monday night. The
remnant low of what is currently Tropical Storm Ida may affect
the region by the middle of next week.
&&
.NEAR TERM /THROUGH TONIGHT/...
9:30 AM Update...
Little change to the forecast this morning and will reevaluate PoPs
for the midday update once morning satellite trends become a little
more established and 12z hi res guidance arrives. Some truly
impressive dew point/RH values so far this morning, with more in the
way of mid to upper 70s (locally 80) dew points than we just about
ever see in this area. Hard to imagine we will not see at least
locally significant hydro impacts by late afternoon/evening as
convection blossoms. Previous discussion follows...
A rather interesting meteorological setup exists today for the
Mid-Atlantic region. A large-scale midlevel ridge initially
centered in the western Atlantic will retrogress slowly to the
Carolina coast by 12z Saturday as it aligns with transient
ridging in southeast Canada, which will promote a southward push
of a cold front in place across the Northeast. Meanwhile, a
convectively-augmented vort max will migrate slowly clockwise
on the northern periphery of the ridge, generally from the
eastern Ohio Valley and central Appalachians this morning to the
northern Mid-Atlantic coast by Saturday morning. Large-scale
lift in advance of the meandering vort max will likely prove
sufficient to generate scattered to numerous storms during the
afternoon in our CWA via diurnal destabilization.
Although there is subtle synoptic forcing as addressed above, as
well as a slowly sagging frontal boundary from the Northeast,
subsynoptic lifting mechanisms will be rather weak and/or chaotic
today. These include orographic lift, sea/bay breezes, differential
heating, etc. As a result, convection-allowing models are
unsurprisingly variable in today's convective evolution. There
are, however, some similar characteristics among the guidance:
(1) greater coverage versus previous days, (2) some semblance of
convective propagation southward and westward, in association
with ambient instability and (weak) low-level trajectories, (3)
slow storm motions via weak tropospheric winds, and (4) multiple
rounds of convection, with the evening/overnight rounds tied
more closely to the larger-scale vort max. The greatest
variability with the convective simulations is with the
coverage/location of the overnight storms, with some models
effectively stabilizing a large portion of the northern Mid-
Atlantic from the daytime storms (becoming the effective front
alluded to earlier). Others are more aggressive in maintaining
convection or developing new storms in close proximity to the
vort max. Current thinking is that both scenarios will likely
play out to some degree. Given the convectively-enhanced nature
of the vort max (potentially exhibiting some warm-core
characteristics via MCV-related processes and attendant
thermodynamic profiles), it would not be surprising to see more
widespread convection during the afternoon/evening become more
closely aligned with the track of the mid-/low-level circulation
during the overnight hours, with potential enhancement via the
southward-shifting frontal boundary. The result is that storm
chances will likely persist well into the overnight hours, but
confidence is not particularly high on where these storms will
be/track. Think this will be determined to some degree by the
evolution of the daytime convection. The bottom line here is
that the forecast through tonight becomes more uncertain with
time, with chances for storms apparent but occurrence, locations,
and coverage not obvious at this time.
There is higher confidence in the potential impacts of any
storms, however. With weak tropospheric flow, high (2+ inch)
PWs, and peak preconvective CAPE exceeding 2000 J/kg, slow-
moving pulse-like storms producing torrential downpours and
isolated microbursts are expected. Convection will likely be
disorganized, with individual cells lasting around an hour or
less and regeneration tied to the production and propagation of
outflow boundaries. Training storms are likely in this regime,
so localized flash flooding is certainly a possibility. No
changes to the flash flood watch were made this morning.
Before convection occurs, it will become quite hot and humid
once again, with temperatures and dew points likely quite
similar to those seen yesterday. Made no changes to the heat
advisory.
Finally, temperatures tonight will likely remain warm, with
muggy conditions continuing. Patchy fog is probable once again,
though this will be modulated by coverage and movement of
convection. There will likely be infiltration of lower stratus
as onshore flow develops poleward of the effective front,
augmented by any predecessor convection. This will also tend to
promote subtly increased cooling in northern portions of the
CWA.
&&
.SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/...
Cold front continues to work its way south through the region
during the day Saturday. Weak low pressure will hover over
Delmarva, and showers and thunderstorms will likely continue
throughout the day. There will be abundant low level moisture
with dew points in the 70s and resulting PWATs will be over 2
inches. Instability shifts south, and SB CAPE values will be
1500-2000 J/kg, mainly over southern New Jersey, the Delaware
Valley, and Delmarva. 0-6 km Bulk Shear values will be less than
20 kt, so although some damaging winds are possible, the main
threat continues to be for flooding. Storm motion of storms that
develop will be slow. FFG remains low, especially given how
much rain has fallen over the last week or so. Flood Watch
remains in effect through Saturday.
Although dew points remain high, the cold front will continue
to pass south through the region, and showers and thunderstorms
will result in cooler temperatures on Saturday. Highs will be in
the 70s and 80s, with temperatures possibly approaching 90 in
southern Delmarva.
Convection tapers off Saturday night as the cold front sags
south of the region. Patchy fog possible given the abundant low
level moisture over the area.
&&
.LONG TERM /SUNDAY THROUGH THURSDAY/...
Unsettled conditions on tap for most of the week. Stationary front
remains south of the region on Sunday, but it begins to lift back
north as a warm front late Sunday and Sunday night. A mid-level
ridge will be near the area, but some weak shortwave energy will
pass through the region. Not expecting widespread convection Sunday,
but cannot rule out scattered afternoon showers and thunderstorms.
The warm front lifts north through the region Monday morning, and
highs warm backup to the upper 80s to around 90 along with surface
dew points in the mid 70s.
A cold front approaches and passes through the region late Monday
and Monday night. More widespread showers and thunderstorms develop
with its passage, and given the abundant low level moisture over
the area, another round of heavy rain and flooding is possible.
By the middle of next week, what is currently Tropical Storm Ida
should be a Tropical Depression somewhere over the Gulf Coast or
Tennessee Valley, and will make a run at the Mid-Atlantic.
Tropical moisture associated with it lifts towards the area and
may bring another round of showers and thunderstorms with heavy
rain to the region sometime late Tuesday through Wednesday. It
depends on its track, and it is quite uncertain right now, as it
could pass well south of the region.
Another cold front may pass through the region towards the end
of next week with a cooler and dryer airmass.
&&
.AVIATION /14Z FRIDAY THROUGH TUESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Through this morning...Morning fog has mostly lifted but reduced
CIGs and VSBYs may continue to affect MIV and ACY through near 15z.
VFR thereafter. Light and variable winds. Moderate confidence.
This afternoon...Greater coverage of convection is expected
this afternoon, with impacts probable at most of the terminals
during the 18z to 00z time window. Storms will be capable of
frequent lightning, torrential downpours, and strong/erratic
wind gusts. Pinpointing exact timing terminal to terminal is
impossible at this point, but given the expected coverage, a
rather broad window of TS mention in the TAFs seems appropriate
currently. Will hopefully be able to narrow down the timing in
subsequent TAF updates. Winds generally light and variable
outside of storms, with local sea/bay breeze effects likely at
ILG/ACY. Low confidence on timing the impacts to the terminals.
Tonight...Chances for showers/storms continue through the
overnight, though precise timing/location are unknown at this
stage. CIGs will likely worsen gradually overnight, with sub-VFR
conditions becoming more likely at most sites after 06z. Light
and variable winds, though there may be a tendency for winds to
become primarily northeasterly late. Low confidence.
Outlook...
Saturday through Saturday night...Sub-VFR conditions in
SHRA/TSRA. Rain may be heavy at times. Fog likely to develop at
night. E-NE winds less than 10 kt. Moderate confidence.
Sunday through Sunday night...Mostly VFR. Scattered SHRA/TSRA
will result in localized sub-VFR conditions. Fog possible
Sunday night. E winds less than 10 kt, becoming SE, then S
Sunday night. Moderate confidence.
Monday through Monday night...Generally VFR. Afternoon and
evening SHRA/TSRA will result in localized restrictions. SW
winds less than 10 kt, becoming NW Monday night. Moderate
confidence.
Tuesday...Generally VFR. Scattered afternoon and evening
SHRA/TSRA possible. NW winds less than 10 kt, then LGT/VRB
Monday night. Moderate confidence.
&&
.MARINE...
Sub-advisory conditions are expected through tonight. Winds
will generally be south or southwest from 5 to 15 kt through
this evening, becoming more easterly tonight. Seas primarily
below 3 feet.
There is a chance of thunderstorms this afternoon through
tonight, with erratic winds and locally higher waves possible.
Outlook...
Saturday through Saturday night...SCA conditions possible,
mainly along the NJ ocean waters, with E winds gusting to 25 kt
and seas building to 5 ft. Generally sub-SCA over DE ocean
waters and DE Bay. Showers and thunderstorms likely.
Sunday through Tuesday...Generally sub-SCA conditions. Several
wind shifts likely. Showers and thunderstorms likely through the
period.
Rip Currents...
There is a LOW risk of rip currents today. Onshore flow is
expected to occur on Saturday, which may increase the risk of
dangerous rip currents somewhat. For now, have maintained a low
risk for Saturday, but subsequent forecasts may require raising
the threat level, especially if onshore flow is stronger than
currently forecast.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT this evening for PAZ070-071-
102>106.
Flash Flood Watch from 2 PM EDT this afternoon through late
Saturday night for PAZ060>062-070-071-101>106.
NJ...Heat Advisory until 8 PM EDT this evening for NJZ008>010-
012>015-017>020-026-027.
Flash Flood Watch from 2 PM EDT this afternoon through late
Saturday night for NJZ007>010-012>022-026-027.
DE...Heat Advisory until 8 PM EDT this evening for DEZ001.
Flash Flood Watch from 2 PM EDT this afternoon through late
Saturday night for DEZ001.
MD...None.
MARINE...None.
&&
Synopsis...MPS
Near Term...CMS/O'Brien
Short Term...MPS
Long Term...MPS
Aviation...CMS/MPS/O'Brien
Marine...CMS/MPSHazardous Weather Outlook National Weather Service Mount Holly NJ 1058 AM EDT Fri Aug 27 2021 DEZ001-281458- New Castle- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for New Castle County in Delaware. .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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. DEZ002-281458- Kent- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Kent County in Delaware. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. DEZ003-281458- Inland Sussex- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for inland portions of Sussex County in Delaware. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. DEZ004-281458- Delaware Beaches- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for the Atlantic coastal portions of Sussex County in Delaware. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. PAZ054-281458- Carbon- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Carbon County in Pennsylvania. .DAY ONE...Through tonight. 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...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. PAZ055-281458- Monroe- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Monroe County in Pennsylvania. .DAY ONE...Through tonight. 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...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. PAZ060-281458- Berks- 1058 AM EDT Fri Aug 27 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ061-281458- Lehigh- 1058 AM EDT Fri Aug 27 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ062-281458- Northampton- 1058 AM EDT Fri Aug 27 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ070-281458- Delaware- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Delaware 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ071-281458- Philadelphia- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Philadelphia 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ101-281458- Western Chester- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for western Chester 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ102-281458- Eastern Chester- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for eastern Chester 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ103-281458- Western Montgomery- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for western Montgomery 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ104-281458- Eastern Montgomery- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for eastern Montgomery 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ105-281458- Upper Bucks- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for upper Bucks 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. PAZ106-281458- Lower Bucks- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for lower Bucks 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ001-281458- Sussex- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Sussex County in New Jersey. .DAY ONE...Through tonight. 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...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. NJZ007-281458- Warren- 1058 AM EDT Fri Aug 27 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ008-281458- Morris- 1058 AM EDT Fri Aug 27 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ009-281458- Hunterdon- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Hunterdon 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ010-281458- Somerset- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Somerset 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ012-281458- Middlesex- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Middlesex 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ013-281458- Western Monmouth- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for western Monmouth 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ014-281458- Eastern Monmouth- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for eastern Monmouth 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ015-281458- Mercer- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Mercer 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ016-281458- Salem- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Salem 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ017-281458- Gloucester- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Gloucester 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ018-281458- Camden- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Camden 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ019-281458- Northwestern Burlington- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for northwestern Burlington 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ020-281458- Ocean- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for inland portions of Ocean 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ021-281458- Cumberland- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Cumberland 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ022-281458- Atlantic- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for inland portions of Atlantic 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. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ023-281458- Cape May- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Cape May County excluding the Atlantic coast in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. NJZ024-281458- Atlantic Coastal Cape May- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for the Atlantic coastal portions of Cape May County in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. NJZ025-281458- Coastal Atlantic- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for coastal portions of Atlantic County in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. NJZ026-281458- Coastal Ocean- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for coastal portions of Ocean 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. NJZ027-281458- Southeastern Burlington- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for southeastern Burlington 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. Heat Advisory. Flash Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. MDZ012-281458- Kent MD- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Kent County in Maryland. .DAY ONE...Through tonight. 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...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. MDZ015-281458- Queen Annes- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Queen Annes County in Maryland. .DAY ONE...Through tonight. 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...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. MDZ019-281458- Talbot- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Talbot County in Maryland. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. MDZ020-281458- Caroline- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for Caroline County in Maryland. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. ANZ430-281458- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for upper Delaware Bay. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. ANZ431-281458- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for lower Delaware Bay. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. ANZ450-281458- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- 1058 AM EDT Fri Aug 27 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...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. ANZ451-281458- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- 1058 AM EDT Fri Aug 27 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...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. ANZ452-281458- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- 1058 AM EDT Fri Aug 27 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...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. ANZ453-281458- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Cape May County out 20 nm. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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. ANZ454-281458- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- 1058 AM EDT Fri Aug 27 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. The probability for widespread hazardous weather is low. .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. ANZ455-281458- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 1058 AM EDT Fri Aug 27 2021 This Hazardous Weather Outlook is for the Atlantic coastal waters adjacent to Sussex County out 20 nm. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .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.
Special Weather Statement National Weather Service Mount Holly NJ 641 AM EDT Fri Aug 27 2021 NJZ020>023-027-271200- Ocean-Cumberland-Atlantic-Cape May-Southeastern Burlington- Including the cities of Jackson, Millville, Hammonton, Cape May Court House, and Wharton State Forest 641 AM EDT Fri Aug 27 2021 ...Patchy dense fog expected through early morning... Surface observations and webcams indicate patchy dense fog has developed in portions of eastern and southern New Jersey. The fog is expected to dissipate rapidly after 8 am; however, if driving early this morning, expect rapidly changing visibilities. Reduce speed, use low-beam headlights, and maintain extra distance from other vehicles. CMS
The Binghamton radar (KBGM), 122 km away, was scanning. The volume nearest the first event began at 16:31 UTC.
20 thunderstorm wind. Local standard time, as filed.
Tree limbs and wires were downed near Country Place Dr. Time estimated from radar and utility company reports.
Wires were downed near Maple Dr. Time estimated from radar.
Wires were downed near PA-115. Time estimated from radar.
Multiple trees were downed on Osborne Rd. Time estimated from radar.
Several trees were reported down around Caln Twp. Time estimated from radar.
Several large branches were downed and blocked traffic. Time estimated from radar.
Multiple trees were downed on Hurley Rd. Time estimated from radar.
Several trees were downed in the area of Pratts Dam Rd. Time estimated from radar.
A tree and utility pole were downed in the 900 block of Horseshoe Pike. Time estimated from radar.
A tree was downed into wires on Molasses Valley Rd. Time estimated from radar.
Multiple trees were downed at Route 30 Bypass and Moore Rd. Time estimated from radar.
Trees were downed along Route 84 between Route 30 Bypass and Business Route 30 just north of Coatesville. Time estimated from radar.
Tree limbs and wires were downed near Blackberry Ln. Time estimated from radar.
A tree was downed on Rainbow Rd near W Lincoln Hwy. Time estimated from radar.
Tree limbs and wires were downed west of Reider Rd. Time estimated from radar.
Trees and wires were downed near Steely Rd and Church Rd. Time estimated from radar.
Trees and wires were downed near Station Rd. Time estimated from radar.
Trees and wires were downed near Plum Rd. Time estimated from radar.
There were multiple reports of trees down between Penn Twp and Centerport. Time estimated from radar.
There were a few reports of downed trees and wires in Centre Twp. 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, August 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: 972252, 972251, 972249, 972257, 972233, 972237, 972258, 972260, 972234, 972242, 972239, 972241, 972248, 972259, 972247, 972254, 972245, 972263, 972261, 972244.