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, 2:46 PM EST, 3 hours 37 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
346 PM EDT Fri Aug 27 2021
.SYNOPSIS...
A weak cold front will slide into the region tonight before
becoming stationary over or just south by tomorrow. The front
may lift north as a warm front Sunday night. Another cold front
could move through the region Monday into Monday night. The
remnant low of Hurricane Ida may progress along that frontal
boundary during the middle to later half of the week.
&&
.NEAR TERM /THROUGH SATURDAY/...
Convection has blossomed across the area this afternoon. As
expected, it has been a weakly forced, chaotic evolution with fairly
widespread coverage but a lack of organization. Numerous sea breeze,
bay breeze, and outflow boundaries have developed and are
contributing to storm development in a very warm and moist air mass.
So far, storms motions have worked out such that hydro issues have
been fairly limited. However, torrential rainfall rates have been
observed, and the situation certainly remains favorable for flash
flooding. No changes have been made to the area of the Flash Flood
Watch. In addition, there have been several storms that have
produced downbursts, and at least a marginal threat for damaging
winds will continue through the evening with the strongest storm
cores. Towards sunset, we should transition to a hydro-only threat.
The evolution for the overnight period and into tomorrow remains
uncertain. The vort max we have been tracking remains to our west,
and will cause forcing to increase over the area tonight. And PWATs
remain very high over the area as the frontal boundary we have been
tracking remains to our north, at least early in the night. These
factors could help yield additional rounds of convection. However,
given a good deal of convection has already occurred, it is unclear
how much the atmosphere has been overturned. And the degree of
overturning will vary from place to place. For example, the Poconos
appear quite stable after earlier storms. However, a thunderstorm
affected portions of Philadelphia, and temperatures fell from the
low 90s to the 70s, then recovered back to near 90 within an hour or
two, indicating plenty of instability remains there. Overall, it
will likely remain a messy and low predictability event through the
night, but I do not expect we will be entirely done with convection
until at least late tonight. And with that will come a continued
risk for flash flooding.
By Saturday, the front will work southward through most of the area.
This and the overturning from prior convection should overall limit
the convective potential on Saturday. Higher PWATs and better
instability will be towards the coast and down south, so PoPs are
highest in those areas. Up north, a better chance for mainly dry
weather. There will also probably be a lot of stratus around in
areas north of the front, which will significantly limit
temperatures. Many areas will not get out of the 70s, and overall it
will probably not be a very "nice" day. But forecast confidence for
Saturday is quite low, pending the evolution of the next 12 to 18
hours. As such, will forego much detail until we get a little more
clarity with ongoing convection.
&&
.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
Depending on how close the front stalls to our region, some
chances for showers and thunderstorms could continue Saturday
night and Sunday. Even with the front south of our region,
overnight fog will continue to be possible as dew points should
remain in the 60s for much of the region.
Chances for showers and thunderstorms start to increase
considerably on Monday as the next cold front approaches the
region.
With the front south of our region on Sunday, highs should once
again be in the 70s and 80s. By Monday, assuming that the next
cold front won't arrive until later in the day, highs near 90
will once again be possible especially across the coastal
plains.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Unsettled conditions on tap for most of the week. The big
question is how the remnant low of Hurricane Ida interacts with
the front and the ultimate impacts for our region. If the front
is still near our region, tropical moisture associated with the
remnant could lift 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, possibly stronger, cold front may pass through the
region towards the end of next week with a cooler and dryer
airmass.
&&
.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Through 06z... At least periodic, localized VSBY restrictions are
likely due to widespread showers and tstms, though prevailing
conditions may remain VFR at most of the terminals. All of the
terminals will be at risk for restrictions, though some will no
doubt be affected more than others. Winds will be mostly light and
variable, but will be erratic due to the tstms. Some briefly higher
gusts are also possible due to tstms. Any tstms could produce
torrential rain. Moderate confidence overall but details will remain
uncertain.
Later tonight-Saturday... By later tonight, CIG and VSBY
restrictions become more likely due to low stratus and fog. There
may also still be showers or isolated tstms in the area. Widespread
MVFR seems probable, and a period of IFR for many of the terminals
appears likely late tonight into Saturday morning. From there, low
stratus will probably linger well into Saturday with continued
restrictions to at least MVFR levels. Some gradual improvement is
possible through the day. The light and erratic winds will become
more steady from the northeast by late tonight, and remain northeast
through Saturday with speeds 10 to 15 kt and gusts locally to 20 kt.
Moderate confidence.
Outlook...
Saturday night...Conditions may start VFR, but there is a good
set up for either low stratus or fog with persistent onshore
flow. E-NE winds less than 10 kt. Low 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 and Wednesday...Generally VFR. Scattered afternoon and
evening SHRA/TSRA possible. NW winds less than 10 kt, then
LGT/VRB Monday night. Moderate confidence.
&&
.MARINE...
Through tonight... Sub-SCA conditions are expected. Showers and
tstms are possible. Winds shifting from southwest to northeast at 10
to 15 kt, but winds may be erratic at times due to tstms. Seas
around 2 ft.
Saturday-Saturday night... Winds and seas will increase, especially
for the Atlantic coastal waters of northern and central New Jersey.
A Small Craft Advisory has been issued for the waters off Monmouth
and Ocean County, where northeast winds will likely gust near to
above 25 kt for much of the day and into the night. Seas will also
gradually build to 4 to 6 ft especially by evening and through the
night. Elsewhere, wind gusts should remain mostly 20 kt or less with
seas remaining 2 to 4 ft.
Outlook...
Sunday through Wednesday...Once seas subside below 5 ft either
late Saturday night or Sunday morning, winds and seas should
stay below SCA criteria for the remainder of the period.
Several wind shifts likely. Showers and thunderstorms likely
at times.
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 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 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 through late Saturday night for DEZ001.
MD...None.
MARINE...Small Craft Advisory from 8 AM Saturday to 6 AM EDT Sunday for
ANZ450-451.
&&
Synopsis...Johnson
Near Term...CMS/O'Brien
Short Term...Johnson/MPS
Long Term...Johnson/MPS
Aviation...Johnson/O'Brien
Marine...Johnson/O'BrienHazardous Weather Outlook National Weather Service Mount Holly NJ 0702 PM EDT Fri Aug 27 2021 DEZ001-282302- New Castle- 0702 PM 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. DEZ002-282302- Kent- 0702 PM 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. DEZ003-282302- Inland Sussex- 0702 PM 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. DEZ004-282302- Delaware Beaches- 0702 PM 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. PAZ054-282302- Carbon- 0702 PM 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. PAZ055-282302- Monroe- 0702 PM 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. PAZ060-282302- Berks- 0702 PM 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. PAZ061-282302- Lehigh- 0702 PM 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. PAZ062-282302- Northampton- 0702 PM 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. PAZ070-282302- Delaware- 0702 PM 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. PAZ071-282302- Philadelphia- 0702 PM 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. PAZ101-282302- Western Chester- 0702 PM 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. PAZ102-282302- Eastern Chester- 0702 PM 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. PAZ103-282302- Western Montgomery- 0702 PM 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. PAZ104-282302- Eastern Montgomery- 0702 PM 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. PAZ105-282302- Upper Bucks- 0702 PM 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. PAZ106-282302- Lower Bucks- 0702 PM 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. NJZ001-282302- Sussex- 0702 PM 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. NJZ007-282302- Warren- 0702 PM 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. NJZ008-282302- Morris- 0702 PM 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. NJZ009-282302- Hunterdon- 0702 PM 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. NJZ010-282302- Somerset- 0702 PM 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. NJZ012-282302- Middlesex- 0702 PM 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. NJZ013-282302- Western Monmouth- 0702 PM 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. NJZ014-282302- Eastern Monmouth- 0702 PM 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. NJZ015-282302- Mercer- 0702 PM 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. NJZ016-282302- Salem- 0702 PM 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. NJZ017-282302- Gloucester- 0702 PM 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. NJZ018-282302- Camden- 0702 PM 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. NJZ019-282302- Northwestern Burlington- 0702 PM 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. NJZ020-282302- Ocean- 0702 PM 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. NJZ021-282302- Cumberland- 0702 PM 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. NJZ022-282302- Atlantic- 0702 PM 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. NJZ023-282302- Cape May- 0702 PM 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. NJZ024-282302- Atlantic Coastal Cape May- 0702 PM 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. NJZ025-282302- Coastal Atlantic- 0702 PM 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. NJZ026-282302- Coastal Ocean- 0702 PM 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. NJZ027-282302- Southeastern Burlington- 0702 PM 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. MDZ012-282302- Kent MD- 0702 PM 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. Scattered severe thunderstorms are possible. 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. MDZ015-282302- Queen Annes- 0702 PM 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. Scattered severe thunderstorms are possible. 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. MDZ019-282302- Talbot- 0702 PM EDT Fri Aug 27 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...Saturday through Thursday. Hot conditions could result in heat exhaustion with prolonged exposure on Monday. 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. MDZ020-282302- Caroline- 0702 PM 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. ANZ430-282302- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- 0702 PM 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. ANZ431-282302- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 0702 PM 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. ANZ450-282302- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- 0702 PM 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. ANZ451-282302- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- 0702 PM 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. ANZ452-282302- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- 0702 PM 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. ANZ453-282302- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- 0702 PM 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. ANZ454-282302- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- 0702 PM 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. ANZ455-282302- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 0702 PM 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.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
556 PM EDT FRI AUG 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0205 PM TSTM WND DMG 1 NNW CALN TWP 40.01N 75.76W
08/27/2021 CHESTER PA 911 CALL CENTER
SEVERAL TREES REPORTED DOWN AROUND CALN
TOWNSHIP. TIME ESTIMATED FROM RADAR.
0210 PM TSTM WND DMG 1 NW CALN TWP 40.01N 75.76W
08/27/2021 CHESTER PA 911 CALL CENTER
SEVERAL LARGE BRANCHES DOWN BLOCKING
TRAFFIC. TIME ESTIMATED FROM RADAR.
0220 PM TSTM WND DMG 2 SE EAST BRANDYWINE TW 40.02N 75.74W
08/27/2021 CHESTER PA 911 CALL CENTER
TREE AND POLE DOWN IN THE 900 BLOCK OF
HORSESHOE PIKE. TIME ESTIMATED FROM RADAR.
0230 PM TSTM WND DMG 1 NNE COATESVILLE 40.00N 75.81W
08/27/2021 CHESTER PA 911 CALL CENTER
MULTIPLE TREES DOWN AT ROUTE 30 BYPASS AND
MOORE ROAD. TIME ESTIMATED.
0230 PM TSTM WND DMG 1 N COATESVILLE 39.99N 75.83W
08/27/2021 CHESTER PA PUBLIC
TREES DOWN ALONG ROUTE 84 BETWEEN 30 BYPASS
AND 30 BUSINESS JUST NORTH OF COATESVILLE.
TIME ESTIMATED FROM RADAR.
0250 PM TSTM WND DMG GREAT MEADOWS 40.87N 74.92W
08/27/2021 WARREN NJ TRAINED SPOTTER
SMALL AREA OF LIMBS DOWN JUST WEST OF GREAT
MEADOWS ALONG US 46. TIME ESTIMATED FROM
RADAR.
0259 PM TSTM WND DMG 1 SW GREAT MEADOWS 40.86N 74.92W
08/27/2021 WARREN NJ PUBLIC
AN MPING REPORT OF DOWNED TREE LIMBS.
0455 PM TSTM WND DMG MONROE TWP 39.67N 74.97W
08/27/2021 GLOUCESTER NJ PUBLIC
STRONG WINDS SNAPPED AN OLD TREE TRUNK. TIME
ESTIMATED FROM RADAR.
0455 PM HAIL MONROE TWP 39.67N 74.97W
08/27/2021 E0.70 INCH GLOUCESTER NJ PUBLIC
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
600 PM EDT FRI AUG 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0555 PM FLASH FLOOD SAYREVILLE 40.46N 74.35W
08/27/2021 MIDDLESEX NJ PUBLIC
WATER RESCUE REPORTED ON WASHINGTON ROAD IN
SAYREVILLE. TIME ESTIMATED.
&&
SFJPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
604 PM EDT FRI AUG 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0505 PM TSTM WND DMG MONROE TWP 39.67N 74.97W
08/27/2021 GLOUCESTER NJ PUBLIC
CORRECTS PREVIOUS TSTM WND DMG REPORT FROM
MONROE TWP. STRONG WINDS SNAPPED AN OLD TREE
TRUNK. TIME ESTIMATED FROM RADAR.
&&
SFJPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT FRI AUG 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0205 PM TSTM WND DMG 1 NNW CALN TWP 40.01N 75.76W
08/27/2021 CHESTER PA 911 CALL CENTER
SEVERAL TREES REPORTED DOWN AROUND CALN
TOWNSHIP. TIME ESTIMATED FROM RADAR.
0210 PM TSTM WND DMG 1 NW CALN TWP 40.01N 75.76W
08/27/2021 CHESTER PA 911 CALL CENTER
SEVERAL LARGE BRANCHES DOWN BLOCKING
TRAFFIC. TIME ESTIMATED FROM RADAR.
0220 PM TSTM WND DMG 2 SE EAST BRANDYWINE TW 40.02N 75.74W
08/27/2021 CHESTER PA 911 CALL CENTER
TREE AND POLE DOWN IN THE 900 BLOCK OF
HORSESHOE PIKE. TIME ESTIMATED FROM RADAR.
0230 PM TSTM WND DMG 1 NNE COATESVILLE 40.00N 75.81W
08/27/2021 CHESTER PA 911 CALL CENTER
MULTIPLE TREES DOWN AT ROUTE 30 BYPASS AND
MOORE ROAD. TIME ESTIMATED.
0230 PM TSTM WND DMG 1 N COATESVILLE 39.99N 75.83W
08/27/2021 CHESTER PA PUBLIC
TREES DOWN ALONG ROUTE 84 BETWEEN 30 BYPASS
AND 30 BUSINESS JUST NORTH OF COATESVILLE.
TIME ESTIMATED FROM RADAR.
0250 PM TSTM WND DMG GREAT MEADOWS 40.87N 74.92W
08/27/2021 WARREN NJ TRAINED SPOTTER
SMALL AREA OF LIMBS DOWN JUST WEST OF GREAT
MEADOWS ALONG US 46. TIME ESTIMATED FROM
RADAR.
0259 PM TSTM WND DMG 1 SW GREAT MEADOWS 40.86N 74.92W
08/27/2021 WARREN NJ PUBLIC
AN MPING REPORT OF DOWNED TREE LIMBS.
0455 PM HAIL MONROE TWP 39.67N 74.97W
08/27/2021 E0.70 INCH GLOUCESTER NJ PUBLIC
0510 PM TSTM WND DMG MONROE TWP 39.67N 74.97W
08/27/2021 GLOUCESTER NJ PUBLIC
CORRECTS PREVIOUS TSTM WND DMG REPORT FROM
MONROE TWP. CORRECTS PREVIOUS TSTM WND DMG
REPORT FROM MONROE TWP. STRONG WINDS SNAPPED
AN OLD TREE TRUNK. TIME ESTIMATED FROM
RADAR.
0555 PM FLASH FLOOD SAYREVILLE 40.46N 74.35W
08/27/2021 MIDDLESEX NJ PUBLIC
WATER RESCUE REPORTED ON WASHINGTON ROAD IN
SAYREVILLE. TIME ESTIMATED.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
632 PM EDT FRI AUG 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0320 PM TSTM WND GST BERKELEY TWP 39.93N 74.30W
08/27/2021 M49 MPH OCEAN NJ MESONET
49 MPH MEASURED WIND GUST AT BERKELEY NJ
MESONET SITE.
&&
BAHSpecial Weather Statement
National Weather Service Mount Holly NJ
641 PM EDT Fri Aug 27 2021
PAZ060-272315-
Berks PA-
641 PM EDT Fri Aug 27 2021
...A strong thunderstorm will impact portions of central Berks County
through 715 PM EDT...
At 640 PM EDT, Doppler radar was tracking a strong thunderstorm over
Spring Ridge, or near Reading, moving northeast at 10 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Reading, Wyomissing, Kutztown, Fleetwood, Sinking Spring, Laureldale,
Wernersville, Leesport, Shoemakersville, Bernville, Lyons, Spring
Ridge, Fairview Hgts, Shillington, West Reading, Mount Penn, Mohnton,
Kenhorst, St. Lawrence and Centerport.
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 41 and 42.
Interstate 176 in Pennsylvania between mile markers 10 and 11.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4027 7603 4045 7619 4059 7579 4030 7566
TIME...MOT...LOC 2240Z 246DEG 10KT 4038 7597
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
GorseThe Dover AFB radar (KDOX), 77 km away, was scanning. The volume nearest the first event began at 23:21 UTC.
3 thunderstorm wind. Local standard time, as filed.
A tree fell into a residence on Cloverfields Dr. No injuries were reported.
Tree limbs and wires were downed near Grace St. Time estimated from radar.
Wires were downed near Perry Cabin Dr. Time estimated from radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2021Every state in 2021This day in weather historyWarnings in Maryland, 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: 972201, 972203, 972204.