Delaware, 2017

Damaging Winds in Delaware, April 6, 2017

April 6, 2017 · NWS PHI · 6 events in 1 county or zone

Low pressure tracked from the Ohio Valley into the Western Great Lakes with a warm front surging northward ahead of the low which was followed by a cold front. Moisture and instability was drawn northwest ahead of the front which led to locally heavy showers and thunderstorms.

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
2
Property damage
None recorded
Crop damage
None recorded
Events
6

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.

Low pressure tracked from the Ohio Valley into the Western Great Lakes with a warm front surging northward ahead of the low which was followed by a cold front. Moisture and instability was drawn northwest ahead of the front which led to locally heavy showers and thunderstorms. Some of thunderstorms were strong to severe with gusty winds.

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 Apr 6, 1:07 PM EST, 50 minutes earlier.

Area forecast discussion, Apr 6, 1:07 PM EST, 50 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
207 PM EDT Thu Apr 6 2017

.SYNOPSIS...
A rapidly deepening surface low in eastern Maryland early this
afternoon, moving into central New York by Friday morning and
into the Maritime Provinces of Canada by Saturday. A broad
surface high builds along the Eastern Seaboard Sunday before
slowly moving into the western Atlantic Monday and Tuesday. A
cold front moves through the Mid- Atlantic region during the
middle of next week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A Severe Thunderstorm Watch has been issued for the eastern
shore of Maryland, Delaware, parts of NJ (Burlington County and
points south), and southeastern PA (Philly metro area including
Chester, Montgomery and Bucks counties). The watch is in effect
until 5 PM EDT, with the greatest threat being damaging winds.
Please stay weather aware and seek shelter if caught in a storm.
When Thunder Roars, Go Indoors!

The warm front associated with low pressure moving north through
the mid-Atlantic region is the dividing line between
temperatures in the upper 60s in southern Delaware and
temperatures in the mid-40s in southeast PA and central NJ.
Temperatures have been adjusted during this update to match
current and near-term expected conditions, but as always the
case with these warm fronts moving north, the timing and
magnitude of these temperatures in any given location is very
difficult.

To the north of the warm front...winds are easterly. To the
south of the warm front, winds are southerly. As the low, and
the warm front, move further north this afternoon, winds are
expected to change from easterly to southerly, then westerly
late as the low moves north. Thunderstorms are now expected
north of the Mason-Dixon line but how far north into the Lehigh
Valley and central NJ remains to be seen. A severe thunderstorm
watch remains in effect until 5 pm for areas along and south of
I-95, including part of the Philadelphia metro area.

Conditions are expected to improve from south to north during
the late afternoon and early evening hours as the low and
associated warm front move north.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM FRIDAY/...
The chances for precipitation drop considerably overnight. A
weak trough will dig southeast along the back side of the
departing low overnight, providing some lift for additional
showers, but not expecting much. One thing of note in this
period is that across the southern Poconos, temperatures will be
cold enough to support a rain/snow mix, but not expecting any
accumulating snow at this point.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
At 12Z Friday, the system bringing us the active weather today will
be decaying as it becomes vertically stacked. The surface low
(located in central/eastern New York) will slowly progress
northeastward into far southeast Canada by 12Z Saturday. Several
perturbations in the midlevel flow will pivot around the large
cyclonic vortex in the Northeast. These vorticity maxima will induce
weak ascent, and with decent boundary-layer mixing in northwest
flow, suspect instability showers will occur, particularly northwest
of the I-95 corridor. However, think the coverage will be fairly
scattered and the precipitation amounts quite light. Thus, I lowered
the inherited PoPs Friday and Friday night to the slight chance to
chance range. Continued to include rain/snow chances in the southern
Poconos, where thermal profiles will be favorable for the white
stuff. Surface temperatures should remain warm enough so that
accumulations would be negligible. With stout cold air advection in
place, temperatures will be below seasonal averages - generally
about 5-10 degrees below climatological means. Winds are around 40
kts at 925 mb Friday afternoon, and the aforementioned mixing should
be able to transport some of this fast flow to the surface.
Increased winds/gusts during the day, and I may still be
underplaying it. Gusts of 25-35 mph will be common. A raw/blustery
spring day is on tap.

The influence of the Northeast low will wane this weekend, and a
sprawling surface high will take over the Eastern Seaboard as high-
amplitude upper-level ridging progresses to the eastern half of the
country. After a cold night Friday, a dry period with warming
temperatures is in store. Saturday highs will be near to slightly
below average, but Sunday through Tuesday will be well above
average, with potential for record highs to be approached early next
week.

The next midlevel vort max approaches the northern plains of the
U.S. by 00Z Tuesday. Operational models are in poor agreement, with
the 12Z ECMWF a southern outlier and the 00Z CMC exhibiting its
usual slow bias. Meanwhile, there are at least some indications of a
cutoff/subtropical low developing upstream of the developing western
Atlantic ridging, though model agreement here (as usual) is abysmal.

As the northern plains vort max continues east in the high-amplitude
ridging in the western Atlantic, the attendant cold front begins to
slow and decay as the dynamical support becomes displaced northeast
of the front.  The 00Z CMC aggressively diminishes the precipitation
as it moves to the East Coast, whereas the 00Z GFS/12Z ECMWF depict
a wetter midweek scenario for the Mid-Atlantic region. However,
phasing differences are profound, with the GFS/ECMWF about 24 hours
off with the frontal passage in our CWA. As such, broadened mention
of PoPs from late Tuesday through Thursday, but kept them mainly
confined to the slight chance to low-end chance range.  Model
consensus places the precipitation here on Wednesday, so this is
where the highest PoPs exist at the moment, but confidence is low.

Two other items of note: Yesterday, I mentioned that this pattern
tends to develop surface lows on the stalling boundary to the south
of the vort max. Notably, the 12Z CMC develops such a low and gives
the East Coast a soaking late next week. The 00Z CMC provides subtle
hints of this as well, albeit considerably weaker. Meanwhile, the
12Z ECMWF has the midweek system picking up the aforementioned
cutoff low near/east of the Bahamas and just missing the East Coast.
Both scenarios seem low probability at this point, but are worth
keeping an eye on in the coming days.

&&

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

IFR conditions expected to continue at most TAF sites with
thunderstorms, gusty winds, and low vsbys until about 21Z at
which time winds are expected to shift to more westerly
direction. VFR or MVFR conditions are then expected after that.
will be adjusted accordingly.

Outlook...

Friday...VFR ceilings are likely (perhaps 4000-7000 feet) with
scattered showers. Winds northwest 15 to 25 kts with gusts up to 35
kts possible. Gusty/erratic winds near showers. Confidence average.

Friday night and Saturday...VFR with northwest winds 10 to 20 kts
with gusts to 25 kts. Confidence above average.

Saturday night through Monday...VFR with winds around or below 10
kts. Confidence well above average.

&&

.MARINE...

Seas will continue to range from 6 to 7 feet tonight and on Friday.
Gale force gusts continue to be possible over the next few hours,
so the gale warning will continue in the Lower Bay and on the NJ
coastline. This will likely need to be converted to a SCA tonight
which will run through Friday. Peak wind gusts from 30 to 35 knots
will be late this afternoon from the east and southeast then winds
will shift to southwest tonight. Another stronger period of
southwesterly SCA gusts is likely tomorrow afternoon around
25-30 knots.

Outlook...

Friday and Friday night...Strong northwest winds (20+ kts) with
gusts to gale-force possible.

Saturday...Small craft advisory winds/seas expected.

Saturday night through Monday...Sub-advisory conditions expected.

&&

.HYDROLOGY...
Flood potential: Widespread showers develop through the morning
hours. Heavy rain is possible for 3 to 6 hours ahead of the
985-988 mb triple point low that develops east of the parent
main low. That triple point low is currently forecast to track
just west of I-95 during the day. That pattern favors southeast
flow east of I-95 with a reduction in potential rainfall in
coastal NJ there but enhancement along and west of the path of
the surface low where 1-2" of rain should fall in 6-9 hours with
isolated 3 inch possible, especially where thunderstorms occur.
That will result in spotty small stream flash flooding
depending on the axis of heaviest rain, but for now we
anticipate se PA and NNJ are the targets of greatest flood
threat.

1. Still forecasting mostly 1 to 2 inches across the watch area.
However, with the convective potential, there could be locally
much higher amounts. Details such as the location of the highest
amounts remain uncertain at this time.

2. The Passaic and Millstone Rivers are the prime large basins
of concern with the Raritan following. Note: if the Passaic
floods as anticipated, it will be the first time May 2, 2014.
For the Millstone, the first time since January 19, 2015.

3. Minor flooding along streams that empty into the Atlantic and the
DE waters may occur near high tide due to strong inflow and rainfall
runoff.

4. The potential for flooding can be broken down into three
different types. Low lying and poor drainage flooding would occur
first during the day Thursday soon after the rain begins. The runoff
will drain and potentially produce flooding midday Thursday into
Thursday night along smaller creeks and streams. Lastly, some larger
rivers and mainstems will rise and could flood Thursday night into
Friday. The river flooding could easily last into or through the
weekend, depending on the magnitude of the rainfall. So for the
southern half of the watch, the threat looks to diminish by
tonight. For east central PA and Northern NJ, the flood watch
continues through mid day tomorrow to account for residual
runoff that by 18z Friday should have a known trend to flood or
not.

5. Please refer to AHPS web page for the latest. Confidence is
higher that a number of forecast points will hit their Flood Stage.
But confidence remains lower on the severity of the flooding.

6: Antecedent conditions: since the 22nd of March, water
equivalent precipitation has been generally 1 to 2 inches above
normal. In fact, during the last week or so, amounts have been
200-400 percent of normal with only near normal temps in a
cooler less evapotranspiration time of year. Since rivers have
not had a chance to return to their base flow, its easier for
the rivers to respond to flood stage or exceed. Checking the
USGS stream flow this morning, many rivers in northern NJ and
east central PA were 75 to 95% above their historical norm.

&&

.TIDES/COASTAL FLOODING...
Overall, the tides this afternoon/evening without factoring
anything additional than astronomical will run slightly lower,
a half foot in spots. This will already decrease the tidal
flooding threat some when compared to the morning cycle. The low
pressure system will be departing to our north by late
afternoon which will cause winds to switch direction from
easterly to northwesterly from south to north. Based on the wind
direction change and later high tide times further south the
risk of minor tidal flooding is minimal along the Delaware
beaches. Tidal levels at high tide are likely to be about a foot
short of advisory threshold.

Further north, along the New Jersey coastline for both Cape May
and Atlantic City the risk minor tidal flooding is also
expected to be minimal with high tide up to a foot short of
advisory threshold. However, Sandy Hook is currently expected to
be near the minor tidal flooding threshold around high tide due
to the continued easterly flow lasting longer. Tides are
currently expected to stay under advisory threshold for the
afternoon/evening cycle at Sandy Hook as well.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch through Friday afternoon for PAZ054-055-062.
     Flood Watch until 11 PM EDT this evening for PAZ060-061-070-
     071-101>106.
NJ...Flood Watch through Friday afternoon for NJZ001-007>010-012-
     013-015.
     Wind Advisory until 5 PM EDT this afternoon for NJZ014-020>027.
     Flood Watch until 11 PM EDT this evening for NJZ016>019.
DE...Wind Advisory until 5 PM EDT this afternoon for DEZ002>004.
     Flood Watch until 11 PM EDT this evening for DEZ001.
MD...Wind Advisory until 5 PM EDT this afternoon for MDZ012-015-019-
     020.
     Flood Watch until 11 PM EDT this evening for MDZ008.
MARINE...Gale Warning until 6 PM EDT this evening for ANZ431-450>454.
     Small Craft Advisory until 5 AM EDT Friday for ANZ430-455.

&&

Synopsis...CMS
Near Term...Johnson/Meola/Miketta
Short Term...Johnson/Miketta
Long Term...CMS
Aviation...CMS/Johnson/Miketta
Marine...CMS/Gaines
Hydrology...
Tides/Coastal Flooding...
Hazardous weather outlook, Apr 6, 11:59 AM EST, 1 hour 58 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
1259 PM EDT Thu Apr 6 2017

PAZ060-061-071700-
Berks-Lehigh-
1259 PM EDT Thu Apr 6 2017

...FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for east central Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

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

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

NJZ001-007>010-015-PAZ054-055-062-071700-
Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Carbon-Monroe-
Northampton-
1259 PM EDT Thu Apr 6 2017

...FLOOD WATCH IN EFFECT THROUGH FRIDAY AFTERNOON...

This Hazardous Weather Outlook is for central New Jersey, northern
New Jersey, northwest New Jersey, east central Pennsylvania and
northeast Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

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

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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

   Flood Watch.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
 conditions according to Standard Operating Procedures.

NJZ012-013-071700-
Middlesex-Western Monmouth-
1259 PM EDT Thu Apr 6 2017

...FLOOD WATCH IN EFFECT THROUGH FRIDAY AFTERNOON...

This Hazardous Weather Outlook is for central New Jersey and
northern New Jersey.

.DAY ONE...This Afternoon and Tonight.

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

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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

   Flood Watch.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
 conditions according to Standard Operating Procedures.

NJZ014-020-026-071700-
Eastern Monmouth-Ocean-Coastal Ocean-
1259 PM EDT Thu Apr 6 2017

...WIND ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

This Hazardous Weather Outlook is for central New Jersey and
southern New Jersey.

.DAY ONE...This Afternoon and Tonight.

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

   Wind Advisory.

The risk for flooding due to heavy rain increases today. Poor
drainage areas, including urban areas, are especially vulnerable.
Additionally, minor tidal flooding is possible with the Thursday
afternoon high tide.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

DEZ002>004-MDZ012-015-019-020-NJZ021>025-027-071700-
Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen Annes-Talbot-
Caroline-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-
Coastal Atlantic-Southeastern Burlington-
1259 PM EDT Thu Apr 6 2017

...WIND ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...
...SEVERE THUNDERSTORM WATCH 133 IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON...

This Hazardous Weather Outlook is for central Delaware, southern
Delaware, northeast Maryland and southern New Jersey.

.DAY ONE...This Afternoon and Tonight.

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

   Wind Advisory.
   Severe Thunderstorm Watch.

The risk for flooding due to heavy rain increases today. Poor
drainage areas, including urban areas, are especially vulnerable.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

DEZ001-MDZ008-NJZ016>019-PAZ070-071-101>106-071700-
New Castle-Cecil-Salem-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
1259 PM EDT Thu Apr 6 2017

...FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 133 IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON...

This Hazardous Weather Outlook is for northern Delaware, northeast
Maryland, southern New Jersey and southeast Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

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

   Flood Watch.
   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

ANZ455-071700-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
1259 PM EDT Thu Apr 6 2017

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This Afternoon and Tonight.

A period of gale force gusts is possible today, especially with
thunderstorms.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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>454-071700-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
1259 PM EDT Thu Apr 6 2017

...GALE WARNING IN EFFECT UNTIL 6 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This Afternoon and Tonight.

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

   Gale Warning.

Thunderstorms could cause strong winds today, as well.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

ANZ431-071700-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
1259 PM EDT Thu Apr 6 2017

...GALE WARNING IN EFFECT UNTIL 6 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 133 IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON...

This Hazardous Weather Outlook is for Delaware Bay Waters.

.DAY ONE...This Afternoon and 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.
   Gale Warning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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.

ANZ430-071700-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
1259 PM EDT Thu Apr 6 2017

...SEVERE THUNDERSTORM WATCH 133 IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON...

This Hazardous Weather Outlook is for Delaware Bay Waters.

.DAY ONE...This Afternoon and 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.

A period of gale force gusts is possible today.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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

Special weather statement, Apr 6, 10:59 AM EST, 2 hours 58 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1159 AM EDT THU APR 6 2017

DEZ002-003-MDZ015-019-020-061630-
Inland Sussex-Kent-Queen Anne's-Talbot-Caroline-
1159 AM EDT THU APR 6 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN SUSSEX...
SOUTHWESTERN KENT...TALBOT...CENTRAL QUEEN ANNE'S AND CAROLINE
COUNTIES...

At 1158 AM EDT, a strong thunderstorm was located over Cambridge,
moving north at 65 mph.

Wind gusts up to 40 mph and pea size hail are possible with this
storm.

This storm will be near...
  Hambleton, Windyhill and Choptank around 1205 PM EDT.
  Easton, Preston and Tanyard around 1210 PM EDT.
  Matthews and Harmony around 1215 PM EDT.
  Denton, Queen Anne, Griffin, Cordova and Skipton around 1220 PM
  EDT.
  Greensboro, Oakland, Ridgely, Jumptown, Hope and Starr around 1225
  PM EDT.
  Goldsboro and Sandtown around 1230 PM EDT.

Other locations impacted by this storm include Hillsboro, Henderson
and Felton.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3859 7606 3860 7606 3863 7608 3862 7612
      3864 7613 3864 7615 3869 7618 3916 7602
      3902 7557 3870 7582 3871 7584 3868 7594
      3863 7598 3860 7599 3857 7604
TIME...MOT...LOC 1558Z 201DEG 60KT 3857 7608

33
Special weather statement, Apr 6, 12:00 PM EST, 1 hour 57 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
100 PM EDT THU APR 6 2017

DEZ001>003-MDZ008-012-015-019-020-NJZ016-017-021-061800-
Inland Sussex-Kent-New Castle-Queen
Anne's-Talbot-Cecil-Kent-Caroline-Salem-Cumberland-Gloucester-
100 PM EDT THU APR 6 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SUSSEX...SOUTHWESTERN
NEW CASTLE...KENT...NORTHEASTERN TALBOT...EASTERN QUEEN ANNE'S...
CAROLINE...NORTHEASTERN KENT...SOUTHEASTERN CECIL...WESTERN
CUMBERLAND...CENTRAL SALEM AND SOUTHWESTERN GLOUCESTER COUNTIES...

At 1259 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Oakland to Preston to 14 miles south
of Cambridge to near Deal Island. Movement was northeast at 60 mph.

Wind gusts up to 50 mph and pea size hail are possible with these
storms.

These storms will be near...
  Federalsburg, Greensboro, Oakland, Preston, Goldsboro, Harmony and
  Sandtown around 105 PM EDT.
  Sudlersville, Agner, Smithville and Griffin around 110 PM EDT.
  Denton, Hartly and Hazlettville around 115 PM EDT.
  Andrewsville around 125 PM EDT.
  Dover, Harrington, Clayton, Cheswold, Green Spring and Dover
  Speedway around 130 PM EDT.
  Smyrna around 135 PM EDT.
  Woodside, Viola and Woodland Beach around 140 PM EDT.
  Seaford, Camden and Delmar around 145 PM EDT.

Other locations impacted by these storms include Barclay, Blades,
Wyoming, Kent Acres, Templeville, Highland Acres, Bethel, Kenton,
Leipsic and Chambersville.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A severe thunderstorm watch remains in effect until 500 PM EDT for
central, northern and southern Delaware...eastern and northeastern
Maryland...and southern New Jersey.

LAT...LON 3846 7569 3865 7571 3869 7577 3868 7580
      3871 7584 3868 7594 3928 7597 3970 7516
      3924 7519 3928 7525 3925 7541 3907 7541
      3901 7533 3891 7531 3882 7520 3846 7520
      3845 7523
TIME...MOT...LOC 1659Z 225DEG 36KT 3904 7587 3872 7589 3836 7603 3813
7602

33
Special weather statement, Apr 6, 1:07 PM EST, 50 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
207 PM EDT THU APR 6 2017

DEZ001>004-MDZ020-NJZ008>010-012>027-PAZ070-071-102>106-061900-
New Castle-Delaware Beaches-Inland Sussex-Kent-Caroline-Coastal
Atlantic-Salem-Camden-Coastal Ocean-Mercer-Northwestern
Burlington-Ocean-Atlantic Coastal Cape May-Atlantic-Southeastern
Burlington-Morris-Hunterdon-Eastern Monmouth-Cumberland-Western
Monmouth-Somerset-Middlesex-Cape May-Gloucester-Lower Bucks-Eastern
Montgomery-Upper Bucks-Western Montgomery-Delaware-Eastern
Chester-Philadelphia-
207 PM EDT THU APR 6 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SUSSEX...EASTERN NEW
CASTLE...KENT...SOUTHEASTERN CAROLINE...OCEAN...CAMDEN...MERCER...
SOMERSET...ATLANTIC...CUMBERLAND...SALEM...SOUTH CENTRAL MORRIS...
SOUTHEASTERN HUNTERDON...GLOUCESTER...CAPE MAY...BURLINGTON...
MONMOUTH...MIDDLESEX...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN
BUCKS...EASTERN CHESTER...PHILADELPHIA AND DELAWARE COUNTIES...

At 205 PM EDT, radar indicated thunderstorms located along a line
extending from Hatboro to near Alloway to near Delmar.
Movement was northeast at 60 mph.

Wind gusts up to 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Philadelphia, Toms River, Trenton, Camden, Wilmington, Vineland, New
Brunswick, Perth Amboy, Plainfield, Atlantic City, Dover, Millville,
Bridgeton, Somerville, Ocean City, Gloucester City, Georgetown,
Somerset, Cumberland and Edison.

Frequent cloud to ground lightning is occurring with these storms.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3974 7419 3976 7410 3975 7410 3954 7440
      3956 7441 3939 7438 3933 7468 3929 7455
      3893 7496 3846 7505 3846 7569 3944 7556
      3937 7540 3959 7555 4021 7541 4080 7456
      4059 7420 4046 7426 4044 7398
TIME...MOT...LOC 1805Z 217DEG 31KT 4017 7513 3953 7530 3851 7562

33
Special weather statement, Apr 6, 1:13 PM EST, 44 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
213 PM EDT THU APR 6 2017

DEZ001-002-MDZ008-012-015-019-020-061900-
Kent-New Castle-Queen Anne's-Talbot-Cecil-Kent-Caroline-
213 PM EDT THU APR 6 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN NEW
CASTLE...WEST CENTRAL KENT...TALBOT...QUEEN ANNE'S...NORTHERN
CAROLINE...KENT AND SOUTHEASTERN CECIL COUNTIES...

At 213 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Shady Side to 7 miles east of Breezy
Point. Movement was northeast at 60 mph.

Wind gusts up to 50 mph and dime size hail are possible with these
storms.

Locations impacted include...
Easton, Centerville, Talbot, Chestertown, Centreville, Greensboro,
Oakland, Ridgely, Rock Hall, St. Michaels, Church Hill, Cecilton,
Oxford, Millington, Sudlersville, Betterton, Goldsboro, Queen Anne,
Hartly and Old Town.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3886 7626 3886 7625 3879 7620 3879 7619
      3894 7621 3889 7629 3896 7631 3885 7637
      3884 7637 3885 7638 3894 7636 3897 7635
      3904 7631 3900 7617 3917 7628 3958 7592
      3908 7559 3866 7616 3878 7629 3867 7634
TIME...MOT...LOC 1813Z 221DEG 54KT 3884 7655 3859 7639

33
Special weather statement, Apr 6, 1:56 PM EST, 1 minute before
Special Weather Statement
National Weather Service Mount Holly NJ
256 PM EDT THU APR 6 2017

DEZ001>003-MDZ008-012-015-019-020-NJZ016>019-021>023-027-PAZ060-070-
071-101>104-062000-
Inland Sussex-Kent-New Castle-Queen
Anne's-Talbot-Cecil-Kent-Caroline-Salem-Camden-Atlantic-Southeastern
Burlington-Northwestern Burlington-Cumberland-Cape
May-Gloucester-Eastern Montgomery-Western
Chester-Philadelphia-Western Montgomery-Delaware-Eastern
Chester-Berks-
256 PM EDT THU APR 6 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN SUSSEX...
NEW CASTLE...KENT...NORTHEASTERN TALBOT...EASTERN QUEEN ANNE'S...
CAROLINE...KENT...CECIL...CAMDEN...WESTERN ATLANTIC...CUMBERLAND...
SALEM...GLOUCESTER...NORTHWESTERN CAPE MAY...WEST CENTRAL
BURLINGTON...MONTGOMERY...BERKS...CHESTER...PHILADELPHIA AND DELAWARE
COUNTIES...

At 255 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Jarrettsville to near Betterton to
near Goldsboro to near Sharptown. Movement was northeast at 60 mph.

Wind gusts up to 50 mph and pea size hail are possible with these
storms.

Locations impacted include...
Philadelphia, Reading, Camden, Wilmington, Vineland, Dover, Newark,
Millville, Bridgeton, Middletown, West Chester, Elkton, Gloucester
City, Cumberland, Calvert, Evesham, Mount Laurel, Norristown, Chester
and Deptford.

Frequent cloud to ground lightning is occurring with these storms.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4057 7602 4065 7598 3988 7470 3952 7472
      3919 7497 3918 7515 3946 7554 3972 7551
      3971 7552 3963 7561 3885 7532 3848 7569
      3865 7571 3870 7589 3933 7616 3952 7598
      3972 7623 3976 7606 4014 7588 4049 7643
TIME...MOT...LOC 1855Z 247DEG 56KT 3965 7650 3940 7603 3910 7585 3849
7568

33

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

6 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, New Castle

When
April 6, 1:57 PM EST
Where
New Castle County, 1.6 mi W of Glasgow
Measured
52 kt (60 mph) estimated gust
Reported by
Trained Spotter
Coordinates
39.600, -75.780

Powerlines taken down due to thunderstorm winds.

Thunderstorm Wind, New Castle

When
April 6, 2:06 PM EST
Where
New Castle County, 0.87 mi SE of Townsend
Measured
52 kt (60 mph) estimated gust
Reported by
State Official
Coordinates
39.390, -75.690

Powerlines down due to thunderstorm winds.

NWS Note: Some meso circulations were noted in the area, a small probability of a tornado based on radar. No direct information to suggest this.

Thunderstorm Wind, New Castle

When
April 6, 2:16 PM EST
Where
New Castle County, 0.53 mi W of Newark
Measured
52 kt (60 mph) estimated gust
Reported by
911 Call Center
Coordinates
39.680, -75.760

Trees and wires downed due to thunderstorm winds.

Thunderstorm Wind, New Castle

When
April 6, 2:21 PM EST
Where
New Castle County, 0.87 mi NE of Harmony
Measured
52 kt (60 mph) estimated gust
Reported by
Newspaper
Coordinates
39.730, -75.670

A tree fell onto a car due to thunderstorm winds.

Thunderstorm Wind, New Castle

When
April 6, 2:25 PM EST
Where
New Castle County, 0.87 mi SE of Hagley
Measured
52 kt (60 mph) estimated gust
Reported by
Newspaper
Coordinates
39.760, -75.570

A large tree fell down due to thunderstorm winds in the Highlands neighborhood leading to power outages and road closures.

Thunderstorm Wind, New Castle

When
April 6, 3:00 PM EST
Where
New Castle County, 1.06 mi W of Greenville
Measured
52 kt (60 mph) estimated gust
Injuries
2 direct, 0 indirect
Reported by
Broadcast Media
Coordinates
39.780, -75.600

A tree fell onto a car due to thunderstorm winds, Two people were injured in the car.

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

More

Every storm in Delaware in 2017Every state in 2017This day in weather historyWarnings in Delaware, April 2017

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: 678775, 678776, 678778, 678779, 678780, 678777.