Damaging Winds in Maryland, July 21, 2021

Name: Damaging Winds in Maryland, July 21, 2021
Start: 2021-07-21T13:47
End: 2021-07-21T15:05
Location: Maryland

July 21, 2021 · NWS PHI · 3 events in 3 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 3

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.

What happened

The episode as NWS PHI wrote it up.

A strong cold front moved through the mid-Atlantic on July 21. Ahead of the front, an environment of moderate wind shear and seasonably warm and humid conditions promoted widespread thunderstorm development. Storms mainly took the form of multi-cell clusters and quasi-linear segments. A number of storms became severe, posing a threat for both damaging winds and, thanks to cold air aloft, large hail as they moved towards the coast. With the front moving through during the mid to late afternoon hours, most of the storm activity was offshore by early evening, with cooler and drier weather behind the front.

What forecasters said that day

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 Jul 21, 1:03 PM EST, 44 minutes earlier.

Area forecast discussion, Jul 21, 1:03 PM EST, 44 minutes before

Area Forecast Discussion
National Weather Service Mount Holly NJ
203 PM EDT Wed Jul 21 2021

.SYNOPSIS...
A cold front will move through the region today before moving
offshore tonight. High pressure will build across the region for
Thursday and Friday moving offshore over the weekend. Another
cold front will move through the area Monday night into Tuesday,
stalling to our south.

&&

.NEAR TERM /THROUGH THURSDAY/...
Severe Thunderstorm Watch 385 remains in effect until 8 pm for
the majority of the forecast area. Only Carbon and Monroe
counties are not included in the Watch.

Cold front over central Pennsylvania and into central New York
continues to approach. A pre-frontal trough has developed ahead
of it and is working its way through New Jersey. With outflow
boundary that was over the area late last night into this
morning having washed out, temperatures rose into the 80s and
dew points rose well into the 60s and low 70s. CIN is gone. As a
result, SB CAPE values range from 1000-1500 J/kg across the
southern Poconos and far northwest New Jersey, and from
2500-3500 J/kg across the rest of New Jersey, southeast
Pennsylvania, and Delmarva. Highest downdraft CAPE values are
along southeast New Jersey and into Delmarva, ranging from
800-100 J/kg, and even portions of southeast Pennsylvania are
over 500 J/kg. Mid-level lapse rates are around 6C, and low
level lapse rates are over 7C, even approaching 8C towards
Delmarva. Even PWATs are over 1.5 inches, indicating threat for
heavy rain.

With steep lapse rates, once storms develop, updrafts will
intensify. Wet bulb zero heights are on or around 1000 feet,
which are fairly low for this time of the year.

Convection has initiated with the strongest storms over
southeast New Jersey, and another area of storms moving into
the Lehigh Valley and Berks county. Focus should be on portions
of New Jersey mainly south of the Fall Line, and towards the
coast. Another area of storms likely towards the Delaware
Valley, including Philadelphia.

Damaging winds and large hail primary threats, with locally
heavy rain and frequent lightning also expected.

Cold front moves through the region this evening. Behind the
immediate passage of the cold front, there may be some northwest
winds gusting 20-25 mph for an hour or so. The storms and the
passage of the cold front will allow for much of the smoke and
haze to dissipate. Thereafter, northwest winds diminish to
nearly calm levels for the overnight. Skies become clear.
Surface dew points drop into the 50s by daybreak.

Thursday features what will likely be the nicest day of July, if
not the whole year. High pressure builds into the Ohio Valley
and 850 mb temps will be around 10C. High temps will generally
be in the lower 80s, except for the upper 70s in the southern
Poconos and northwest New Jersey. A drying northwest wind both
at the surface and aloft will allow for mixing, and surface dew
points will drop into the low 50s.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
High pressure continues to build east Thursday night. Lows once
again in the 50s to the north and in the 60s elsewhere.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
The trough aloft moves offshore on Saturday as the surface high
starts to settle over the western Atlantic and we see a surface
trough develop over the Mid-Atlantic. Low pressure will pass to the
north of the area on Monday, dragging a cold front through our area
Monday night into Tuesday. The front may then stall nearby or just
to the south of area.

Several shortwaves will cross the region through the early part of
the week, keeping us unsettled with chances for showers and
thunderstorms. While there will be a chance for storms each day, the
majority of the time it will be dry and we are not expecting it to
be a total washout.

Temperatures will be more seasonable with highs in the mid to upper
80s (cooler to the north). As we head into the early part of the
week, the 90s may start creeping back in and dew points will be on
the rise, returning us to a slightly muggier air mass. Behind the
front, we should see dew points drop back down a little bit.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Rest of this afternoon (18Z-00Z)...MVFR VSBY in HZ will
dissipate, and VSBY will become VFR. SHRA/TSRA with brief sub-
VFR conditions in +RA, hail, and potentially damaging winds.
Will carry TEMPO groups for convection until 21Z-22Z. W-NW winds
less than 10 kt, except higher in TSRA over terminals. Gusts to
20 kt possible for a few hours behind immediate passage of cold
front. High confidence in overall pattern, low confidence on
timing of TSRA passing over a given terminal.

Tonight (00Z-12Z)...VFR/becoming SKC. NW winds 5 kt or less.
High confidence.

Thursday (12Z-00Z)...VFR. NW winds less than 10 kt. High
confidence.

Outlook...

Thursday...Mostly VFR. West to northwest winds around 5 to 10 knots.
High confidence.

Friday...Mostly VFR. Sub-VFR conditions possible in isolated showers
and thunderstorms. Light west to northwest winds. High confidence
with low confidence on storms reaching the terminals.

Saturday...Mostly VFR. Sub-VFR conditions possible in showers and
thunderstorms. Southerly winds around 5 to 10 knots. High confidence
with low confidence on storms reaching the terminals.

Sunday...Mostly VFR. Sub-VFR conditions possible in scattered
showers and thunderstorms. Southwest winds around 10 to 15 knots.
Moderate confidence.

&&

.MARINE...
Tonight through Thursday...In generally, sub-SCA conditions.
Showers and thunderstorms into early this evening will result in
VSBY restrictions in heavy rain, hail, and damaging winds.
Storms end between 8pm-10pm. Winds turns NW tonight at 15-20 kt,
but not expecting 25 kt gusts. NW winds diminish Thursday
morning, and there is the potential for afternoon sea breezes
Thursday afternoon. Seas 2-4 feet.

Outlook...

Thursday night through Sunday...Sub-Small Craft Advisory
conditions are expected across the area waters. Scattered
showers and thunderstorms on Saturday and Sunday may produce
locally higher winds and waves.

Rip Currents...

This afternoon through Thursday...There is a LOW risk for the
development of dangerous rip currents.

&&

.TIDES/COASTAL FLOODING...
There is the potential that high tide tonight on the tidal
Delaware River may hit minor flooding again but should remain
below advisory levels.

Going into the Thursday and Friday evening high tides, some
coastal areas could approach at least minor flood thresholds.
The full moon is on Friday which will lead to higher
astronomical tides Thursday and Friday, but there may also be
enough of a down-shore component to the wind to push enough
water back toward land to increase tidal levels, especially on
Thursday.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...None.

&&

Synopsis...Meola
Near Term...MPS
Short Term...Meola
Long Term...Meola
Aviation...MPS
Marine...MPS
Tides/Coastal Flooding...WFO PHI

Hazardous weather outlook, Jul 21, 11:03 AM EST, 2 hours 44 minutes before

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
1203 PM EDT Wed Jul 21 2021

DEZ001-221603-
New Castle-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Friday.

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.

DEZ002-221603-
Kent-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Kent 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

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.

DEZ003-221603-
Inland Sussex-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for inland portions of Sussex 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ004-221603-
Delaware Beaches-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal portions of
Sussex 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ054-221603-
Carbon-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Carbon County in Pennsylvania.

.DAY ONE...Through tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ055-221603-
Monroe-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Monroe County in Pennsylvania.

.DAY ONE...Through tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ060-221603-
Berks-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Berks County in Pennsylvania.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

PAZ061-221603-
Lehigh-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Lehigh County in Pennsylvania.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

PAZ062-221603-
Northampton-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Northampton County in
Pennsylvania.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

PAZ070-221603-
Delaware-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ071-221603-
Philadelphia-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ101-221603-
Western Chester-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ102-221603-
Eastern Chester-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ103-221603-
Western Montgomery-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ104-221603-
Eastern Montgomery-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ105-221603-
Upper Bucks-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ106-221603-
Lower Bucks-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

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.

NJZ001-221603-
Sussex-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Sussex County in New Jersey.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

NJZ007-221603-
Warren-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Warren County in New Jersey.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

NJZ008-221603-
Morris-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Morris County in New Jersey.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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.

NJZ009-221603-
Hunterdon-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ010-221603-
Somerset-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ012-221603-
Middlesex-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

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.

NJZ013-221603-
Western Monmouth-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ014-221603-
Eastern Monmouth-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ015-221603-
Mercer-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ016-221603-
Salem-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Friday.

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.

NJZ017-221603-
Gloucester-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ018-221603-
Camden-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ019-221603-
Northwestern Burlington-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

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.

NJZ020-221603-
Ocean-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ021-221603-
Cumberland-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ022-221603-
Atlantic-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ023-221603-
Cape May-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Cape May County excluding the
Atlantic coast in New Jersey.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ024-221603-
Atlantic Coastal Cape May-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal portions of
Cape May County in New Jersey.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

Please go to weather.gov/phi/ehwo for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ025-221603-
Coastal Atlantic-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for coastal 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ026-221603-
Coastal Ocean-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor coastal flooding is possible on Thursday.
Minor coastal flooding is possible on Friday.

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.

NJZ027-221603-
Southeastern Burlington-
1203 PM EDT Wed Jul 21 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.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ012-221603-
Kent MD-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Kent County in Maryland.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ015-221603-
Queen Annes-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Queen Annes County in Maryland.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ019-221603-
Talbot-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Talbot County in Maryland.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ020-221603-
Caroline-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for Caroline County in Maryland.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ430-221603-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for upper Delaware Bay.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ431-221603-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for lower Delaware Bay.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ450-221603-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Monmouth County out 20 nm.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ451-221603-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Ocean County out 20 nm.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ452-221603-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Atlantic County out 20 nm.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ453-221603-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Cape May County out 20 nm.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ454-221603-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
1203 PM EDT Wed Jul 21 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.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ455-221603-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
1203 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Sussex County out 20 nm.

.DAY ONE...Through tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Local storm report, Jul 21, 1:29 PM EST, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
229 PM EDT WED JUL 21 2021

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

0200 PM     HAIL             TEMPLE                  40.41N 75.93W
07/21/2021  E1.00 INCH       BERKS              PA   TRAINED SPOTTER

&&

Local storm report, Jul 21, 1:31 PM EST, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
231 PM EDT WED JUL 21 2021

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

0220 PM     HAIL             DEPTFORD TWP            39.84N 75.12W
07/21/2021  E0.25 INCH       GLOUCESTER         NJ   TRAINED SPOTTER

&&

Local storm report, Jul 21, 1:32 PM EST, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
232 PM EDT WED JUL 21 2021

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

0215 PM     TSTM WND DMG     1 WSW ALLENTOWN         40.60N 75.49W
07/21/2021                   LEHIGH             PA   911 CALL CENTER

            WIDESPREAD TREE DAMAGE IN WEST ALLENTOWN.

&&

Local storm report, Jul 21, 1:41 PM EST, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
241 PM EDT WED JUL 21 2021

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

0205 PM     HAIL             2 WNW ALLENTOWN         40.62N 75.51W
07/21/2021  E0.75 INCH       LEHIGH             PA   TRAINED SPOTTER

            SOUTH WHITEHALL TOWNSHIP.

&&

Special weather statement, Jul 21, 1:41 PM EST, 6 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
241 PM EDT Wed Jul 21 2021

PAZ060-070-071-101>104-211930-
Eastern Montgomery-Western Montgomery-Delaware-Western
Chester-Eastern Chester-Berks-Philadelphia-
241 PM EDT Wed Jul 21 2021

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN BERKS...
MONTGOMERY...NORTHEASTERN CHESTER...NORTHWESTERN PHILADELPHIA AND
NORTHEASTERN DELAWARE COUNTIES...

At 241 PM EDT, strong thunderstorms were clustered over Pottstown, or
18 miles east of Reading, moving southeast at 30 mph.

Wind gusts up to 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Philadelphia, Norristown, Pottstown, Phoenixville, Lansdale, West
Norriton, East Norriton, Conshohocken, Hatboro, Souderton, Ambler,
Swarthmore, Birdsboro, Collegeville, Royersford, Narberth, Trappe,
Hatfield, Schwenksville and Bryn Athyn.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 301 and 306, and between
mile markers 311 and 345.
 Northeast Extension between mile markers 21 and 36.
 Interstate 76 in Pennsylvania between mile markers 327 and 338.
 Interstate 476 in Pennsylvania between mile markers 3 and 19.
 Interstate 176 in Pennsylvania between mile markers 3 and 5.

LAT...LON 4043 7559 4022 7515 4017 7507 3990 7535
      4020 7594
TIME...MOT...LOC 1841Z 304DEG 27KT 4024 7559

NC

Local storm report, Jul 21, 1:46 PM EST, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
246 PM EDT WED JUL 21 2021

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

0115 PM     HAIL             MANAHAWKIN              39.70N 74.26W
07/21/2021  E1.00 INCH       OCEAN              NJ   PUBLIC

&&

The radar

The Dover AFB radar (KDOX), 79 km away, was scanning. The volume nearest the first event began at 18:48 UTC.

Open the radar archive at this moment

Event by event

3 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Talbot

When: July 21, 1:47 PM EST
Where: Talbot County, Bar Neck
Measured: 56 kt (64 mph) measured gust
Reported by: Mesonet
Coordinates: 38.680, -76.330

Measured at the Blackwalnut Harbor Weatherflow site (xbwh).

Thunderstorm Wind, Caroline

When: July 21, 2:55 PM EST
Where: Caroline County, 0.54 mi W of Hillsboro
Measured: 50 kt (58 mph) estimated gust
Reported by: Public
Coordinates: 38.920, -75.940

A tree was downed across alternate Maryland Route 404.

Thunderstorm Wind, Queen Anne'S

When: July 21, 3:05 PM EST
Where: Queen Anne'S County, 1.11 mi ENE of Queenstown
Measured: 55 kt (63 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 38.988, -76.152

Trees were downed along US-301 at Del Rhodes Ave.

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Maryland in 2021 Every state in 2021 This day in weather history Warnings in Maryland, July 2021

Sources

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: 965147, 965145, 965146.