Slow moving low pressure tracked through the Great Lakes region on April 30. As it did so, an associated cold front began to approach the coastal mid-Atlantic.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Slow moving low pressure tracked through the Great Lakes region on April 30. As it did so, an associated cold front began to approach the coastal mid-Atlantic. A couple waves of low pressure developed along the front. High pressure to the northeast helped contribute to a tight pressure gradient over the region, and a strong southerly low level jet developed. As temperatures warmed during the late morning and afternoon, increased mixing led to strong wind gusts. In some cases, winds were strong enough to produce tree and utility damage.
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 30, 10:12 AM EST, 1 hour 38 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
1112 AM EDT Thu Apr 30 2020
.SYNOPSIS...
An area of low pressure over the Great Lakes will weaken today
while an area of low pressure over the southeast US will
gradually move northeastward and strengthen. This low will push
a warm front north into the region today and then push a cold
front through the region late tonight into Friday morning.The
low will linger nearby or just to our east Friday before weak
high pressure builds in for Saturday. Another storm system then
approaches from the west late Sunday into Monday. High pressure
looks to then briefly move in next Tuesday before another system
could affect the region by the middle of next week.
&&
.NEAR TERM /THROUGH TONIGHT/...
920 AM Update: south-north oriented plume of heavy rain is just
off to our west but will be moving in within the next couple
hours as it gradually translates eastward. No changes in
rainfall thinking at this time. However big change with this
update was to increase the wind/gust forecast and upgrade to
High Wind warning for all of southern NJ, Philly and Delaware
Counties in PA and all of Delaware. Based on latest obs, trends,
and examining forecast soundings think we should be able to mix
down S/SE winds within the lowest 1500 feet within the warm
sector and this would indicate from the profiles that 40-50+
knot wind gusts will be doable for the aformentioned
zones...especially near the Delaware Bay due to funneling
affects. The Wind Advisory buffers zones to the north as far as
Berks County east through Montgomery and Bucks Counties in PA
and then through Mercer and Middlesex Counties in NJ.
Previous Discussion: A highly amplified mid-lvl low centered
near Michigan will slowly progress eastward during the day
today, while the primary surface low will begin to decay and a
secondary low over the southern Appalachians will gradually
intensify and slowly move northeastward. This storm system will
present multiple hazards, including the potential for strong
wind gusts and the potential for heavy rainfall and associated
hydrology impacts.
Winds...
A strong low level jet will continue to develop as the surface
cyclone deepens over the Great Lakes region. The pressure
gradient will rapidly tighten this morning and 925mb winds
increase to 60 to 70kts just ahead of a frontal boundary. The
jet maximum sets up over DelMarVa and wanes further inland. So
keeping this in mind, models continue to suggest that we'll see
a decently mixed boundary layer. This means that areas over
DelMarVa and adjacent to Delaware Bay will be in for a very
gusty day. Latest trends in the hires guidance point to a low
probably but high impact wind event with gusts potentially as
high as 60-65kts along the Delaware Bay. I suspect that NAMnest
is overmixing the gusts but even reducing the explicit wind gust
from the NAMnest by 10 kts still results in 50kts along the
land-sea interface of DE and southeastern NJ. Lapse rates in the
1000-925mb layer steepen up to 8-9C just ahead of the front
which is when the highest winds will be expected to mix down.
Unfortunately this also corresponds to when the jet max is
located over the region.
Looking at the HREF probabilities there's a 90% contour of
sustained winds in excess of 30kts for Sussex DE and southeast
NJ with and ensemble max sustained wind between 35-45kts.
Considering the chance for sustained winds nearly reaching the
advisory criteria for wind gusts and the strong mixing
potential, I've opted to upgrade the Wind Advisory to a High
Wind Warning for the coastal locations in Sussex DE, Cape May
County and coastal Atlantic county. The highest wind gusts will
likely peak between 2 to 6 pm this afternoon just ahead of
convective line. Winds gusts will be higher on land than the
waters as the cooler sea surface temps will promote just enough
stability to not see a 3-4 hour duration of Storm Force winds
however a few brief storm force gusts right on shore can't be
ruled out.
Further inland the winds do not appear to be quite a strong,
and so the Wind Advisory still remains in place. As the evening
crew mentioned however, with the strong low level jet in place,
its certainly possible that a few of the stronger convective
storms could have the potential to mix down stronger winds
potentially leading to severe thunderstorms.
Winds will start to relax this evening behind the front as an
abrupt shift from southeast to southwest occurs behind the front
and mixing ends quickly.
Heavy Rainfall...
Regarding the heavy rain threat, early morning guidance
continues to depict an area of fairly widespread heavy rainfall
slowly progressing eastward into our area this afternoon ahead
of the system's cold front. Although the actual front will
become a bit less defined thermodynamically as the northern
(primary) low weakens, the precipitation shield is expected to
intensity as moisture streams northward via the LLJ and
continued strong dynamic lift occurs ahead of the mid-lvl
system. High-resolution guidance has trended slightly slower
with bringing the heavier precipitation into our area and
consequently it may not nose into western areas until mid (or
even late) afternoon. Prior to the heavier rainfall this
afternoon there may be some lighter precipitation near the
increasingly diffuse warm front, however this rainfall is
expected to be light and largely focused over the usual
southerly upslope areas. This evening the heavier rainfall will
progress eastward and is largely expected to have cleared the
area by early Friday AM (although some showery precipitation may
remain).
There are still discrepancies on both the forward progression
and intensity of the heavier rainfall today/tonight and
consequently precipitation amounts vary widely across the board
with lower end guidance (e.g. the GFS/00Z HRRR) depicting areal
averages in the 0.75-1.5 inch range while on the higher end
(e.g. the HRW NMMB and the EC) paint a wide swath of 2-3+ inch
amounts. Generally went with a middle ground solution in line
with the NAM 3km/RGEM which forecasts 1.5-2.5 inches over the
bulk of the area with an area of lower amounts (nearer to an
inch) along the NJ Coastal Plain and an area of nearly 3 inches
over the Poconos. Admittedly there will almost certainly be
convective elements and mesoscale features which will make the
actual rainfall field much messier than what is forecast. With
these numbers being very similar to the previous forecast, saw
no reason to modify the existing Flood Watch.
&&
.SHORT TERM /FRIDAY/...
The Mid-lvl low will move overhead on Friday but will be
filling as it does so. Although we will be certainly drier than
Thursday, there will be enough lingering moisture to support
continued showery precipitation through much of the day. Given
cold air advection aloft, the latest guidance indicates that
instability may be sufficient to generate convective
precipitation and potentially even some thunder. Consequently
added a slight chance of thunder to the forecast for Friday
afternoon, and bumped up QPF amounts slightly (although with
precipitation having a convective texture these are highly
uncertain). Fortunately the wind fields calm down considerably
on Friday so any severe threat looks limited, however moderate
rainfall in any convective cells could exacerbate any lingering
hydro issues from Thursday nights rainfall. Otherwise expect
mostly cloudy skies with highs in the mid to upper 60s.
&&
.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
For the long range, there will be a brief reprieve in the
active weather for Saturday as weak ridging builds in to the
south. There could still be a couple lingering showers early in
the day but otherwise it should be mostly dry with variable
cloud cover and seasonable temperatures.
Tranquil weather should continue at least into the first half
of Sunday before the next low pressure system with its
associated cold front approaches from Ontario. This could bring
some showers into mainly eastern PA zones by late day. Ahead of
this system temperatures will warm with highs in the low 70s for
most areas except cooler for the coast and the southern
Poconos.
The aformentioned system will move through with some showers
and even a few possible storms Sunday night into early Monday
before we should get another reprieve by late day Monday as the
system moves away. High pressure looks to move in for next
Tuesday before the next system could affect the region by the
middle of next week.
&&
.AVIATION /15Z THURSDAY THROUGH MONDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Today...Generally MVFR conditions in the morning, lowering to a
mix of MVFR/IFR in the afternoon. Rain showers will overspread
the region from the west between about 15Z and 18Z. The rain
will become heavy in the afternoon with isolated thunderstorms.
Southeast wind 15 to 20 knots with gusts of 25 to 35 knots
inland with gusts up to 40kts anticipated at ILG/ACY/MIV. The
low level jet intensifies during the morning with low level wind
shear and turbulence expected. Medium to high confidence on the
wind, and medium confidence on the flight categories.
Tonight...Generally IFR conditions in rain showers. The rain
will be heavy at times in the evening with isolated thunder
storms. Southeast wind 10 to 15 knots with gusts around 20
knots, becoming southwest 5 to 10 knots. Medium confidence.
Outlook...
Friday...MVFR/IFR conditions improving to MVFR. Rain showers
likely with some isolated thunderstorms possible. West to
northwest wind 5 to 10 knots. Medium confidence.
Friday night...Generally VFR. Showers will be clearing the
region. A chance of showers. West wind around 10 knots. Medium
confidence.
Saturday...Mainly VFR. Northwest wind 10 to 15 knots. Medium
confidence.
Saturday night...Mainly VFR. Northwest to west wind 5 to 10
knots. Medium confidence.
Sunday...Mainly VFR. A chance of showers in the afternoon.
Southwest wind around 10 knots. Medium confidence.
Sunday night...VFR/MVFR conditions with a chance of showers.
Southwest wind around 10 knots , becoming northwest. Medium
confidence.
Monday...VFR/MVFR conditions with a chance of showers.
Northwest wind 10 to 15 knots. Medium confidence.
&&
.MARINE...
Gale conditions are expected as winds increase out of the
southeast 20 to 30 kts with gusts to 40 across most of Atlantic
Waters with the winds being slightly higher across the southern
Waters adjacent to DE and southern NJ with gusts potentially
approaching storm force. Seas will continue to build under a
southeast fetch with wave heights developing to 8 to 11 feet on
the ocean and 5 to 7 feet at the mouth of the Delaware Bay.
Showers with isolated thunderstorms are expected late in the
day and some of these storms could transport strong winds gusts
down causing winds gusts to be in excess of 45-50kts.
Winds should veer from southeast to southwest behind the cold
front and drop to 5-10 kts. SCA will go into effect as soon as
the Gale Warning is dropped due to seas remaining 5-7 feet
through much of Friday
Outlook...
Friday...Southwest winds 10 to 15 knots. Seas initially 7-10
ft.
Friday night...West winds 10 to 15 knots with gusts up to 20
knots. Waves on our ocean waters should decrease to 5 to 7 feet.
Saturday...Seas decreasing below SCA criteria during the day on
Saturday with NW winds 10-15 kts gusting to 20kts.
Saturday night through Monday...Sub SCA conditions.
&&
.HYDROLOGY...
A heavy rainfall event is expected over the area starting this
afternoon and potentially lingering into Friday morning. At this
time forecast precipitation totals are forecast to be in the
1.5 to 3.0 inch range with amounts generally increasing with
westward extent (e.g. the lowest totals in the coastal plain and
highest totals in the Poconos). Locally higher amounts are
possible particularly in the higher terrain of the Poconos and
NW NJ, while lower amounts (e.g. nearer to 1 inch are possible
in the NJ Coastal Plain).
A flood watch is in effect for the forecast area, apart from
the NJ coastal plain, from Thursday afternoon to Friday
afternoon. At this time the greatest threat for small stream and
urban flooding looks to be over the urban corridor and
locations in eastern PA. However there will also be significant
rises on the main stem rivers with many points expected to get
into at least action stage within the Flood Watch. Currently,
Pine Brook is the only point forecast to go over flood stage.
&&
.TIDES/COASTAL FLOODING...
The strong southeast to south flow will continue to push water
up Chesapeake Bay, and also into Delaware Bay and the tidal
Delaware River.
A Coastal Flood Advisory remains in effect for the upper
eastern shore of Chesapeake Bay to cover the high tide into this
afternoon. Water levels are expected to get particularly high
in some of the tidal areas of Kent County and Cecil County where
they may approach the moderate flooding threshold. Chesapeake
Bay may not be allowed to drain much for tonight's high tide, so
there could be one more round of minor flooding tonight.
A Coastal Flood Advisory has been issued for the late afternoon
and evening high tide on the far upper Delaware Bay and on the
tidal Delaware River. Similar to Chesapeake Bay, another round
of minor flooding is possible with the next high tide that
occurs on Friday morning, especially taking into account the
contribution of runoff for the expected heavy rainfall.
Also, we have issued a Coastal Flood Statement for localized
minor flooding along Barnegat Bay due to the persistent south to
southeast flow. It is in effect from this afternoon into this
evening.
&&
.CLIMATE...
Rainfall records for April 30 and May 1.
April 30 May 1
Mount Pocono PA 2.60 in 2014 2.00 in 1921
Allentown PA 3.13 in 2014 0.95 in 1976
Reading PA 3.00 in 2014 1.84 in 1932
Philadelphia PA 4.42 in 2014 1.77 in 1976
Trenton NJ 4.03 in 2014 2.09 in 1976
Atlantic City NJ 2.44 in 2014 1.47 in 1976
Wilmington DE 3.89 in 2014 2.29 in 1976
Georgetown DE 1.20 in 1989/1990 0.99 in 1963
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch from 2 PM EDT this afternoon through Friday
afternoon for PAZ054-055-060>062-070-071-101>106.
High Wind Warning until 8 PM EDT this evening for PAZ070-071.
Coastal Flood Advisory from 6 PM to 11 PM EDT this evening for
PAZ070-071-106.
Wind Advisory until 8 PM EDT this evening for PAZ060-101>106.
NJ...Flood Watch from 2 PM EDT this afternoon through Friday
afternoon for NJZ001-007>010-012-015>019.
High Wind Warning until 8 PM EDT this evening for NJZ013-014-
016>027.
Coastal Flood Advisory from 3 PM this afternoon to 7 PM EDT
this evening for NJZ016.
Coastal Flood Advisory from 6 PM to 11 PM EDT this evening for
NJZ017>019.
Wind Advisory until 8 PM EDT this evening for NJZ012-015.
DE...Flood Watch from 2 PM EDT this afternoon through Friday
afternoon for DEZ001>004.
High Wind Warning until 8 PM EDT this evening for DEZ001>004.
Coastal Flood Advisory from 3 PM this afternoon to 7 PM EDT
this evening for DEZ001.
MD...Flood Watch from 2 PM EDT this afternoon through Friday
afternoon for MDZ008-012-015-019-020.
Wind Advisory until 8 PM EDT this evening for MDZ008-012-015-
019-020.
Coastal Flood Advisory until 6 PM EDT this evening for MDZ008-
012.
Coastal Flood Advisory until 2 PM EDT this afternoon for
MDZ015-019-020.
MARINE...Gale Warning until 2 AM EDT Friday for ANZ430-431-450>455.
&&
Synopsis...Fitzsimmons
Near Term...Carr/Deal/Fitzsimmons
Short Term...Carr
Long Term...Fitzsimmons
Aviation...Deal/Fitzsimmons
Marine...Deal/Fitzsimmons
Hydrology...Staff
Tides/Coastal Flooding...Iovino
Climate...StaarmannHazardous Weather Outlook National Weather Service Mount Holly NJ 1002 AM EDT Thu Apr 30 2020 NJZ012-015-PAZ060-101>105-011415- Middlesex-Mercer-Berks-Western Chester-Eastern Chester- Western Montgomery-Eastern Montgomery-Upper Bucks- 1002 AM EDT Thu Apr 30 2020 ...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... This Hazardous Weather Outlook is for central New Jersey, northern New Jersey, east central Pennsylvania and southeast Pennsylvania. .DAY ONE...Today 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. 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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ001-007>010-PAZ054-055-061-062-011415- Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Lehigh- Northampton- 1002 AM EDT Thu Apr 30 2020 ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... This Hazardous Weather Outlook is for northern New Jersey, northwest New Jersey, east central Pennsylvania and northeast Pennsylvania. .DAY ONE...Today 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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. MDZ008-012-011415- Cecil-Kent MD- 1002 AM EDT Thu Apr 30 2020 ...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today 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. Coastal Flood Advisory. 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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. PAZ106-011415- Lower Bucks- 1002 AM EDT Thu Apr 30 2020 ...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 PM TO 11 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast Pennsylvania. .DAY ONE...Today 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. Flood Watch. Coastal Flood Advisory. .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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. MDZ015-019-020-011415- Queen Annes-Talbot-Caroline- 1002 AM EDT Thu Apr 30 2020 ...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON... ...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today 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. Coastal Flood Advisory. 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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ017>019-PAZ070-071-011415- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- 1002 AM EDT Thu Apr 30 2020 ...HIGH WIND WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 PM TO 11 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southern New Jersey and southeast Pennsylvania. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. High Wind Warning. Flood Watch. Coastal Flood Advisory. .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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. DEZ001-NJZ016-011415- New Castle-Salem- 1002 AM EDT Thu Apr 30 2020 ...HIGH WIND WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for northern Delaware and southern New Jersey. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. High Wind Warning. Flood Watch. Coastal Flood Advisory. .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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ013-014-020>027-011415- Western Monmouth-Eastern Monmouth-Ocean-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean- Southeastern Burlington- 1002 AM EDT Thu Apr 30 2020 ...HIGH WIND WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central New Jersey and southern New Jersey. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. High Wind Warning. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. DEZ002>004-011415- Kent-Inland Sussex-Delaware Beaches- 1002 AM EDT Thu Apr 30 2020 ...HIGH WIND WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH FRIDAY AFTERNOON... This Hazardous Weather Outlook is for central Delaware and southern Delaware. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. High Wind Warning. 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... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. ANZ430-431-450>455-011415- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- 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- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 1002 AM EDT Thu Apr 30 2020 ...GALE WARNING IN EFFECT UNTIL 2 AM EDT FRIDAY... This Hazardous Weather Outlook is for Atlantic coastal waters and Delaware Bay Waters. .DAY ONE...Today 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. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1144 AM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1135 AM NON-TSTM WND GST CARVILLE 39.05N 76.01W
04/30/2020 M53 MPH QUEEN ANNE'S MD MESONET
MDDOT SENSOR; US-301 AT MD-305.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1148 AM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1126 AM NON-TSTM WND DMG 1 NNW SKIPTON 38.90N 76.06W
04/30/2020 TALBOT MD DEPT OF HIGHWAYS
US-50 EASTBOUND CLOSED PRIOR TO SKIPTON
LANDING RD DUE TO TREE DEBRIS.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1152 AM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1105 AM NON-TSTM WND DMG EAST COVENTRY TWP 40.21N 75.61W
04/30/2020 CHESTER PA PUBLIC
MPING REPORT OF 3 INCH TREE LIMBS OR POWER
POLES BROKEN; POWER OUTAGES REPORTED IN THE
AREA.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1221 PM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1215 PM NON-TSTM WND GST 2 SSE GREENWOOD 38.78N 75.58W
04/30/2020 M54 MPH SUSSEX DE PUBLIC
CWOP SITE.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1236 PM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1157 AM NON-TSTM WND DMG 1 WSW TROOPER 40.14N 75.43W
04/30/2020 MONTGOMERY PA TRAINED SPOTTER
LARGE TREE LIMB DOWN IN WIRES ON EAGLEVILLE
RD NEAR DENISE CT. FIRE DEPARTMENT CALLED TO
SCENE.
&&
JEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1243 PM EDT THU APR 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1230 PM NON-TSTM WND DMG NETHER PROVIDENCE TWP 39.90N 75.37W
04/30/2020 DELAWARE PA FIRE DEPT/RESCUE
SEVERAL FIRE DEPARTMENT CALLS FOR DOWNED
TREES AND TREE LIMBS INTO POWER LINES
INCLUDING IN THORNBURY TWP, EDDYSTONE, AND
NETHER PROVIDENCE TWP.
&&
JEOThe national radar mosaic for the moment the first event began.
3 high wind. Local standard time, as filed.
Several reports of downed trees and wires were received including in the Dagsboro, Frankford, and Selbyville areas. A CWOP station near Greenwood also measured a 54 mph wind gust.
Multiple reports of downed trees and wires were received including near Felton and near Houston.
The New Castle County Airport (KILG) ASOS measured a 58 mph wind gust. Several reports of downed trees and power lines were received, including a tree blown into a house in Newport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Delaware in 2020Every state in 2020This day in weather historyWarnings in Delaware, April 2020
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: 882643, 882642, 882640.