Thunderstorms brought heavy rain to southeastern Pennsylvania on the afternoon of June 8. Rainfall totals of 3 to 7 inches were reported in the Brandywine Creek basin of Chester County.
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.
Thunderstorms brought heavy rain to southeastern Pennsylvania on the afternoon of June 8. Rainfall totals of 3 to 7 inches were reported in the Brandywine Creek basin of Chester County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Jun 8, 2:29 PM EST, 21 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
329 PM EDT Tue Jun 8 2021
.SYNOPSIS...
High pressure remains centered over the western Atlantic through
Wednesday with a surface trough over our area. A cold front will
slowly move through our area Wednesday night into Thursday, and may
stall over southern parts of the area by Thursday night and Friday.
One or two waves of low pressure may track along this boundary
Friday into Saturday. High pressure should then generally dominate
the weather over most of the weekend.
&&
.NEAR TERM /THROUGH WEDNESDAY/...
An upper-level ridge responsible for the ongoing heat and humidity
will continue to flatten along its northern periphery through
Wednesday. This is in response to a shortwave trough sliding across
the Northeast. A surface trough will also be present with a cold
front approaching from the north.
For the remainder of this afternoon, hot and very humid conditions
are being tempered in some areas due to convection cooling things
down. Heat indices prior to the convection reached the mid to upper
90s for many areas with some locations touching 100 degrees.
Convection is producing torrential rainfall given precipitable water
values very near 2 inches across the area along with slow storm
motions. A mesoanalysis indicated 2000-4000 J/kg of SBCAPE with
MLCAPE up to 2500 J/KG. The very moist environment combined with
warm cloud depths is resulting in excessive rainfall rates with the
strongest cores, and therefore local flash flooding is the main
threat into this evening. A local wet microburst cannot be ruled out
with stronger pulse cores and the water-loaded updraft collapses.
Outflow is also getting ahead of some of the convection with gusty
winds with it. Freezing levels are just above 14000 feet (via both
12z Dulles and Upton RAOBs), therefore any hail should be small and
limited.
Another very warm and muggy night tonight as convection is expected
to dissipate through the evening with the loss of heating and as a
shortwave exits to our northeast. Given how hot/humid the airmass is
however, instability will linger for awhile. Some fog is possible
during the night, especially where downpours occurred during the day
as winds go light to even calm. However at least some residual cloud
cover may temper fog development. Low temperatures are not expected
to get below 70 for much of the area.
For Wednesday, a thermal trough will be in place once again while a
couple of shortwaves move across the area. Meanwhile, the
precipitable water values will remain near 2.00 inches and MLCAPE
values increase to 1500-2500 J/kg. Given the rather unstable
environment with no organized/strong forcing, convective development
should initiate west of the fall line with the help of terrain. The
flow is weak and therefore storm motions will be slow again,
therefore locally very heavy rain will occur with the potential for
localized flash flooding. We are not anticipating severe
thunderstorms, although a few wet microbursts could occur given
water-loaded updrafts that can collapse (outflow) especially within
any areas of higher DCAPE. Frequent lightning will occur with the
strongest cores. Despite some more cloud cover and convection
around, temperatures should still top out right at 90 especially for
the I-95 corridor eastward and inland from the coast. The dew points
should remain in the lower 70s, and when combined with temperatures
near 90 yields peak heat indices in the mid 90s. This is marginal
regarding meeting the advisory criteria, however given the
cumulative effect on the body we opted to extend the Heat Advisory
through Wednesday (heat index criteria is 96-100 degrees here). Weak
flow should result in an offshore wind turning more southerly and
therefore offering some cooling along the coast.
&&
.SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
Above normal temperatures and unsettled weather will continue
through the short term period.
On Wednesday night, a cold front will slowly sag southwestward
into the area. The frontal system will be the trigger to
generate another rounds of scattered showers and isolated
thunderstorms across the Mid Atlantic as the short wave finally
crosses the area overnight as well. Severe weather is not
expected, but any showers or thunderstorms will likely heavy
rain.
By Thursday, the cold front is expected to stall across the Mid
Atlantic region, before an area of low pressure develops along
the front to or west overnight Thursday. With the front stalled
near the area, as instability develops during the day, chances
rapidly increase for showers and thunderstorms. As the low
pressure develops along the front overnight and moves eastward,
along with a couple of short wave/vorticity impulses, showers
and thunderstorms will likely remain a threat into the overnight
hours. PW values will range from 1.75-2.25 inches, so the heavy
rain will continue to be a concern.
Given the low FFG values because of the all the recent
rainfall, flooding can not be ruled out, and much of SEPA, NJ,
and DelMarVa remain in a Marginal Risk for WPC's Excessive
Rainfall Outlook.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
Overview...
A pattern change looms large for the long term as eastern US ridging
collapses and a backdoor cold frontal passage brings a return to
onshore flow and cooler temperatures. We begin the period with the
backdoor cold front still in the vicinity as it comes to a near
stall over the southern portion of the area. A wave of low pressure
associated with an approaching shortwave is likely to track along
the front and bring a round of rain to at least portions of the area
on Friday. The departure of the surface wave will push the backdoor
front well south of us. This should lead to mainly dry weather for
the weekend in an onshore flow regime. By early next week, a highly
amplified pattern looks to set up over the CONUS, with strong
ridging in the West and troughing in the East. This will keep
any hot weather at bay heading into next week, but confidence is
low regarding additional rain chances.
Dailies...
Friday-Friday night... The backdoor cold front will remain stalled
over southern portions of the area. As a shortwave trough approaches
from the west, a wave of low pressure is likely to develop and track
along the front, bringing rain to the area. Some of the 08.12z
guidance made a significant southward shift with this system, which
if it comes to fruition would leave at least northern parts of the
area dry on Friday. Alternatively, a more northern track could
essentially bring an all day washout of light to moderate rain. Have
carried high chc to low lkly PoPs over the area (lowest to the
north) due to track uncertainty. With onshore flow and the
expectations for rain or at least a lot of cloud cover, Friday is
forecast to be the coolest day of the next 7. Highs only in the low
70s are expected. That surface wave will steadily depart out to sea
on Friday night, and as it does so, the frontal boundary will be
pushed to our south with dry weather returning.
Saturday-Sunday... By Saturday morning, low pressure will likely be
departing the area with mainly dry weather in its wake. In between
weather systems and with weak high pressure in the area, dry weather
is expected to prevail for most of the weekend. The big difference
from the prior weekend will be the temperatures. Onshore flow is
expected both days, keeping temperatures in the 70s, and only upper
60s to low 70s along the coast. Lows will be in the upper 50s to
near 60, near normal. Another cold front, this one moving in from
the northwest, will approach on Sunday. With limited instability due
to the marine air mass, this front looks unlikely to be a big
rainfall producer. A shower cannot be ruled out late Sunday and
Sunday night, especially to the west.
Monday-Tuesday... Behind the cold front, a shift to an offshore flow
pattern is expected, which should actually cause temperatures to go
up instead of down behind the front. With falling heights over the
East, hot weather is not expected, but we will probably be close to
normal. Rain chances are very much uncertain by early next week.
Guidance disagrees on whether coastal low pressure will form
downstream of the eastern trough. For now have kept PoPs fairly low,
but some adjustments are likely.
&&
.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
This afternoon...VFR overall. Some showers and thunderstorms will
result in local but significant restrictions at times. Southwest to
west-southwest winds 5-10 knots, potentially more southerly at KILG
and KACY due to a sea/bay breeze. Gusty northwest winds will occur
with some thunderstorms. Moderate confidence.
Tonight...Mostly VFR as any showers and thunderstorms dissipate in
the evening. Some fog however is possible overnight especially at
any terminals that had earlier downpours. Southwesterly winds around
5 knots, becoming light and variable. Low confidence on the extent
and timing of any fog.
Wednesday...Generally VFR. Showers and thunderstorms mainly in the
afternoon, resulting in local significant restrictions at times.
West to northwest winds 5-10 knots, except becoming southwest or
south mainly at KACY. Moderate confidence.
Outlook...
Wednesday night...Generally VFR. Showers and thunderstorms
diminish. West to northwest winds 5-10 knots from around I-95
corridor northward, west to southwest south of I-95 corridor.
Wind shift to north to northeast overnight. Moderate confidence.
Thursday...Mostly VFR conditions expected. Showers and
thunderstorms likely which could temporarily lead to lower
conditions. East to northeast winds 5-10 knots. Moderate
confidence.
Thursday night...Conditions lower to MVFR with IFR possible overnight.
Showers and thunderstorms likely. East to northeast winds 5-10
knots. Moderate confidence.
Friday-Friday night... Most indications are for MVFR or IFR due to
rain. However, latest model guidance suggests some potential for VFR
especially north of PHL. Best chance of MVFR/IFR will be from PHL
southward. By late Friday night, all terminals should trend
towards VFR. East or northeast wind 5 to 10 kt. Low confidence.
Saturday-Saturday night... Mainly VFR. Northeast wind 5 to 10 kt,
becoming easterly at 5 kt or less overnight. Moderate confidence.
Sunday-Sunday night... Mainly VFR. Southeast wind 5 to 10 kt
becoming light and variable overnight. Moderate confidence.
&&
.MARINE...
The conditions are anticipated to remain below Small Craft Advisory
criteria through Wednesday. Some fog/haze is possible very late
tonight and Wednesday morning.
Outlook...
Wednesday night-Thursday night...Sub Advisory conditions
anticipated. Daily chances for showers and thunderstorms could
lead to locally higher winds and waves.
Friday-Sunday...On the Atlantic coastal waters, seas may
approach marginal SCA levels (5 ft) by late Friday and remain 4
to 5 ft through the period. On Delaware Bay, continued sub-SCA
conditions are expected. Easterly or northeasterly winds are
expected to gust 20 kt or less.
Rip Currents...
A LOW risk for the development of dangerous rip currents continues
through Wednesday for the New Jersey and Delaware beaches, with just
modest southerly flow and waves around 2 feet in the surf zone. A
LOW risk may continue for Thursday despite onshore flow
starting.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT Wednesday for PAZ070-071-102-104-
106.
NJ...Heat Advisory until 8 PM EDT Wednesday for NJZ015-017>019.
DE...Heat Advisory until 8 PM EDT Wednesday for DEZ001.
MD...None.
MARINE...None.
&&
Synopsis...O'Brien
Near Term...Gorse
Short Term...Deal
Long Term...O'Brien
Aviation...Deal/Gorse/O'Brien
Marine...Deal/Gorse/O'BrienHazardous Weather Outlook National Weather Service Mount Holly NJ 0321 PM EDT Tue Jun 08 2021 DEZ001-091921- New Castle- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. DEZ002-091921- Kent- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Kent County in Delaware. .DAY ONE...Through tonight. There is a low probability of widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Wednesday through 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. DEZ003-091921- Inland Sussex- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. DEZ004-091921- Delaware Beaches- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. PAZ054-091921- Carbon- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Carbon County in Pennsylvania. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ055-091921- Monroe- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Monroe County in Pennsylvania. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ060-091921- Berks- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Berks County in Pennsylvania. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ061-091921- Lehigh- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Lehigh County in Pennsylvania. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ062-091921- Northampton- 0321 PM EDT Tue Jun 08 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. Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ070-091921- Delaware- 0321 PM EDT Tue Jun 08 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. Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ071-091921- Philadelphia- 0321 PM EDT Tue Jun 08 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. Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ101-091921- Western Chester- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for western Chester County in Pennsylvania. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ102-091921- Eastern Chester- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ103-091921- Western Montgomery- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for western Montgomery County in Pennsylvania. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ104-091921- Eastern Montgomery- 0321 PM EDT Tue Jun 08 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. Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. PAZ105-091921- Upper Bucks- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for upper Bucks County in Pennsylvania. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. PAZ106-091921- Lower Bucks- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ001-091921- Sussex- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Sussex County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ007-091921- Warren- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Warren County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ008-091921- Morris- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Morris County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ009-091921- Hunterdon- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Hunterdon County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ010-091921- Somerset- 0321 PM EDT Tue Jun 08 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. Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ012-091921- Middlesex- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Middlesex County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ013-091921- Western Monmouth- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for western Monmouth County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ014-091921- Eastern Monmouth- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for eastern Monmouth County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ015-091921- Mercer- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ016-091921- Salem- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Salem County in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ017-091921- Gloucester- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ018-091921- Camden- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ019-091921- Northwestern Burlington- 0321 PM EDT Tue Jun 08 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. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. NJZ020-091921- Ocean- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for inland portions of Ocean County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through 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. NJZ021-091921- Cumberland- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Cumberland County in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ022-091921- Atlantic- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for inland portions of Atlantic County in New Jersey. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. NJZ023-091921- Cape May- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. NJZ024-091921- Atlantic Coastal Cape May- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. NJZ025-091921- Coastal Atlantic- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. NJZ026-091921- Coastal Ocean- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for coastal portions of Ocean County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through 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. NJZ027-091921- Southeastern Burlington- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for southeastern Burlington County in New Jersey. .DAY ONE...Through tonight. Please go to weather.gov/phi/ehwo for more information on potential weather hazards. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. MDZ012-091921- Kent MD- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Kent County in Maryland. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. MDZ015-091921- Queen Annes- 0321 PM EDT Tue Jun 08 2021 This Hazardous Weather Outlook is for Queen Annes County in Maryland. .DAY ONE...Through tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. 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. MDZ019-091921- Talbot- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. MDZ020-091921- Caroline- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ430-091921- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ431-091921- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ450-091921- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ451-091921- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ452-091921- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ453-091921- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ454-091921- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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. ANZ455-091921- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 0321 PM EDT Tue Jun 08 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...Wednesday through Monday. 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
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
254 PM EDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0156 PM TSTM WND DMG 1 SE LOWER GWYNEDD TWP 40.18N 75.21W
06/08/2021 MONTGOMERY PA FIRE DEPT/RESCUE
A DOWNED TREE BLOCKED BETHLEHEM RD. TIME
ESTIMATED FROM RADAR.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
257 PM EDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0110 PM LIGHTNING 2 SW ANALOMINK 41.04N 75.25W
06/08/2021 MONROE PA FIRE DEPT/RESCUE
LIGHTNING STRUCK A HOUSE ON SOMSERSET DR.
FIRE DEPARTMENT RESPONDED FOR SMOKE IN
BASEMENT. TIME ESTIMATED FROM RADAR AND
DISPATCH REPORT.
&&
JEOSpecial Weather Statement
National Weather Service Mount Holly NJ
313 PM EDT Tue Jun 8 2021
NJZ009-010-012-015-PAZ105-106-081945-
Hunterdon-Somerset-Middlesex-Mercer-Lower Bucks-Upper Bucks-
313 PM EDT Tue Jun 8 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN HUNTERDON...
NORTHWESTERN MERCER...SOMERSET...NORTHWESTERN MIDDLESEX AND NORTHERN
BUCKS COUNTIES...
At 312 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Martinsville to Cloverhill to
Pipersville. Movement was east at 20 mph.
Wind gusts up to 45 mph and half inch hail are possible with these
storms.
Locations impacted include...
New Brunswick, Somerville, Somerset, Edison, East Brunswick,
Bridgewater, South Brunswick, North Brunswick, Middlesex, Princeton,
Bound Brook, Manville, Quakertown, Byram, Bedminster, Flemington,
Tinicum, Pennington, New Hope and Dublin.
This includes the following highways...
New Jersey Turnpike between exits 10 and 11.
Interstate 78 in New Jersey between mile markers 28 and 42.
Interstate 287 in New Jersey between mile markers 0 and 22.
Garden State Parkway between mile markers 130 and 134.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4040 7448 4030 7488 4040 7531 4052 7536
4057 7497 4066 7466 4066 7452 4065 7451
4066 7450 4066 7440 4063 7442 4060 7446
4060 7424
TIME...MOT...LOC 1912Z 272DEG 19KT 4060 7454 4049 7476 4044 7514
StaarmannSpecial Weather Statement
National Weather Service Mount Holly NJ
315 PM EDT Tue Jun 8 2021
PAZ060-101>103-105-081945-
Upper Bucks-Western Montgomery-Western Chester-Eastern Chester-Berks-
315 PM EDT Tue Jun 8 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN BERKS...
NORTHWESTERN MONTGOMERY...WEST CENTRAL BUCKS AND NORTH CENTRAL
CHESTER COUNTIES...
At 315 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near East Greenville to near Glenmoore.
Movement was east at 15 mph.
Wind gusts up to 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
Pottstown, Coatesville, Downingtown, Royersford, East Greenville,
Schwenksville, Elverson, Bally, Bechtelsville, Green Lane, Pughtown,
Spring Mount, Lionville-Marchwood, Glenmoore, Chester Springs,
Geryville, Lionville, Gilbertsville, Cedarville and Stowe.
This includes the following highways...
Pennsylvania Turnpike between mile markers 302 and 315.
Northeast Extension between mile markers 36 and 43.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4046 7557 4045 7553 4042 7549 4044 7545
4042 7530 3992 7574 4005 7592
TIME...MOT...LOC 1915Z 287DEG 11KT 4038 7553 4006 7581
StaarmannPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
332 PM EDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1230 PM TSTM WND DMG 2 W UWCHLAN TWP 40.05N 75.67W
06/08/2021 CHESTER PA FIRE DEPT/RESCUE
THREE TREES FELL ON A VACANT VEHICLE ON
DOWLIN FORGE RD, PULLING LIVE WIRES DOWN ON
THE VEHICLE. TIME ESTIMATED FROM RADAR.
&&
JEOSpecial Weather Statement
National Weather Service Mount Holly NJ
343 PM EDT Tue Jun 8 2021
PAZ101>103-082015-
Western Montgomery-Western Chester-Eastern Chester-
343 PM EDT Tue Jun 8 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WEST CENTRAL MONTGOMERY
AND CHESTER COUNTIES...
At 343 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Royersford to near West Grove.
Movement was southeast at 10 mph.
Wind gusts up to 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Downingtown,
Kennett Square, Collegeville, Oxford, Royersford, Trappe, West Grove,
Cochranville, Pughtown, Marshallton, Lionville-Marchwood, Glenmoore,
Chester Springs, Lionville, Ladenberg and Kemblesville.
This includes Pennsylvania Turnpike between mile markers 306 and 321.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways. A Flash Flood Warning remains in effect.
LAT...LON 4024 7569 4023 7538 3972 7578 3972 7583
3978 7600
TIME...MOT...LOC 1943Z 292DEG 9KT 4019 7560 3980 7589
StaarmannThe Philadelphia radar (KDIX), 125 km away, was scanning. The volume nearest the first event began at 19:51 UTC.
7 flash flood. Local standard time, as filed.
Widespread roadway flooding occurred in Valley Township, Coatesville and South Coatesville. There were numerous water rescues. Minor flooding occurred along the West Branch of the Brandywine Creek in and around Coatesville and South Coatesville.
Widespread roadway flooding occurred in East Brandywine Township and Caln Township. There were numerous water rescues.
Widespread roadway flooding occurred in Parkesburg and Sadsburyville. There were numerous water rescues.
A water rescue took place at the intersection of Jefferson Avenue and Green Street in Downingtown.
The bridge over Harvey Run on Ring Road in Chadds Ford Township was overtopped by flood waters.
Moderate flooding occurred along the West Branch of the Brandywine Creek in Modena and East Fallowfield Township.
Major flooding occurred along the East Branch of the Brandywine Creek below Downingtown in West Bradford Township and East Bradford Township.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2021Every state in 2021This day in weather historyWarnings in Pennsylvania, June 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 953735, 953734, 953736, 953739, 953737, 953741, 953742.