Alert archive / New Jersey / Areal Flood Advisories in 2019

Areal Flood Advisory 45, NWS Philadelphia/Mount Holly

May 8, 2019Camden County, Gloucester County, New Jersey; Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 8, 2019, 1:06 AM EDT for Camden County, Gloucester County, New Jersey; Chester County, Delaware County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 8, 2019, 1:06 AM EDT (05:06 UTC)
Expired: May 8, 2019, 5:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Camden County, NJ, Gloucester County, NJ, Chester County, PA, Delaware County, PA

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 5.1 hours before the alert went out and 236 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, 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 this areal flood advisory went out at May 7, 9:30 PM EDT, 3 hours 36 minutes earlier.

Area forecast discussion, May 7, 9:30 PM EDT, 3 hours 36 minutes before

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Hazardous weather outlook, May 7, 3:02 PM EDT, 10 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
302 PM EDT Tue May 7 2019

DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-
060>062-070-071-101>106-081915-
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-
Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-
Camden-Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-Carbon-Monroe-Berks-Lehigh-Northampton-
Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
302 PM EDT Tue May 7 2019

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

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

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

ANZ430-431-450>455-081915-
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-
302 PM EDT Tue May 7 2019

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, May 7, 7:45 PM EDT, 5 hours 21 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
745 PM EDT Tue May 7 2019

PAZ060>062-080015-
Lehigh-Northampton-Berks-
745 PM EDT Tue May 7 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN BERKS...LEHIGH AND
WEST CENTRAL NORTHAMPTON COUNTIES...

At 744 PM EDT, a strong thunderstorm was located over Wanamakers, or
11 miles southeast of Tamaqua, moving east at 30 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Allentown, Bethlehem, Emmaus, Northampton, Slatington, Bath,
Walnutport, Neffs, Wanamakers, Coffeetown, New Tripoli, Jordan
Valley, Ancient Oaks, Emerald, Schnecksville, Claussville,
Catasauqua, Coplay, Macungie and North Catasauqua.

LAT...LON 4068 7590 4069 7587 4070 7583 4076 7572
      4072 7537 4043 7555 4066 7591
TIME...MOT...LOC 2344Z 291DEG 24KT 4068 7582

PO

Special weather statement, May 7, 8:12 PM EDT, 4 hours 54 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
812 PM EDT Tue May 7 2019

NJZ007-009-010-PAZ060>062-103-105-106-080100-
Hunterdon-Somerset-Warren-Lower Bucks-Upper Bucks-Lehigh-Western
Montgomery-Northampton-Berks-
812 PM EDT Tue May 7 2019

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT HUNTERDON...
SOUTHWESTERN WARREN...SOUTHWESTERN SOMERSET...NORTHEASTERN BERKS...
NORTHWESTERN MONTGOMERY...SOUTHERN LEHIGH...NORTHWESTERN BUCKS AND
SOUTHEASTERN NORTHAMPTON COUNTIES...

At 811 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Pleasant Valley to Lehigh University
to near Hamburg. Movement was southeast at 40 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Allentown, Easton, Somerville, Somerset, Bethlehem, Bridgewater,
Middlesex, Emmaus, Bound Brook, Manville, Quakertown, Perkasie,
Byram, Wilson, Bedminster, Hellertown, Kutztown, Flemington, Hamburg
and Fleetwood.

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

LAT...LON 4057 7602 4060 7601 4062 7543 4075 7501
      4059 7450 4056 7453 4052 7449 4039 7488
      4035 7569 4056 7609
TIME...MOT...LOC 0011Z 298DEG 33KT 4072 7507 4061 7540 4058 7602

PO

Special weather statement, May 7, 8:51 PM EDT, 4 hours 15 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
851 PM EDT Tue May 7 2019

NJZ009-010-012>015-080115-
Hunterdon-Eastern Monmouth-Western
Monmouth-Somerset-Middlesex-Mercer-
851 PM EDT Tue May 7 2019

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN
HUNTERDON...MERCER...SOMERSET...CENTRAL MONMOUTH AND MIDDLESEX
COUNTIES...

At 850 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Martinsville to Frenchtown. Movement was
southeast at 30 mph.

Pea size hail is possible with these storms. Wind gusts up to 35 mph
are also possible.

Locations impacted include...
Trenton, New Brunswick, Perth Amboy, Long Branch, Somerville,
Somerset, Edison, Middletown, Old Bridge, East Brunswick,
Bridgewater, South Brunswick, Sayreville, North Brunswick, Marlboro,
Manalapan, Ewing, Tinton Falls, Holmdel and Middlesex.

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

LAT...LON 4014 7462 4019 7470 4015 7472 4033 7494
      4040 7496 4043 7507 4054 7507 4068 7453
      4062 7442 4060 7446 4060 7439 4051 7425
      4046 7426 4045 7415 4038 7404 4035 7407
      4035 7400 4032 7403 4033 7397 4031 7397
TIME...MOT...LOC 0050Z 316DEG 27KT 4063 7457 4051 7503

PO

Special weather statement, May 7, 8:54 PM EDT, 4 hours 12 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
854 PM EDT Tue May 7 2019

PAZ060-071-101-103>106-080200-
Lower Bucks-Upper Bucks-Eastern Montgomery-Western Montgomery-Western
Chester-Berks-Philadelphia-
854 PM EDT Tue May 7 2019

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN BERKS...
MONTGOMERY...BUCKS...NORTHEASTERN CHESTER AND NORTHEASTERN
PHILADELPHIA COUNTIES...

At 853 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Erwinna to near Quakertown to near
Fleetwood. Movement was southeast at 25 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Philadelphia, Trenton, Bensalem, Ewing, Norristown, Pottstown,
Phoenixville, Lansdale, West Norriton, East Norriton, Quakertown,
Perkasie, Doylestown, Byram, Hatboro, Souderton, Bedminster, Ambler,
Collegeville and Royersford.

LAT...LON 4052 7596 4046 7555 4042 7549 4045 7545
      4044 7540 4053 7507 4042 7506 4040 7496
      4033 7494 4030 7487 4024 7483 4022 7477
      4015 7472 4007 7502 4017 7566
TIME...MOT...LOC 0053Z 320DEG 21KT 4049 7507 4041 7538 4048 7584

PO

Local storm report, May 7, 9:04 PM EDT, 4 hours 2 minutes before

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The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 8:12 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	48 min
May 7, 8:24 PM EDT	Small Craft Advisory	PHI		31 hr
May 7, 8:51 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	24 min
May 7, 8:54 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	66 min

Nearby

Areal Flood Advisories in New Jersey, 2019 Areal Flood Advisories in Pennsylvania, 2019 Every areal flood advisory in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.