Alert archive / New Jersey / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

August 16, 2010Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 16, 2010, 7:45 PM EDT for Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 16, 2010, 7:45 PM EDT (23:45 UTC)
Expired: Aug 16, 2010, 8:45 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly

Counties Gloucester County, NJ, Salem County, NJ, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 23:46 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.8 hours before the alert went out and 74 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: 501 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 538 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 16, 7:25 PM EDT, 20 minutes earlier.

Area forecast discussion, Aug 16, 7:25 PM EDT, 20 minutes before

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Hazardous weather outlook, Aug 16, 12:29 PM EDT, 7 hours 16 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1229 PM EDT MON AUG 16 2010

NJZ001-007>010-015-PAZ054-055-060>062-067>071-171630-
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MERCER-CARBON-MONROE-BERKS-
LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
1229 PM EDT MON AUG 16 2010

...SEVERE THUNDERSTORM WATCH 619 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...NORTHERN
NEW JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL
PENNSYLVANIA...NORTHEAST PENNSYLVANIA 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.

   SEVERE THUNDERSTORM WATCH.

SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON INTO EARLY THIS
EVENING ACROSS NORTHEAST PENNSYLVANIA AND NORTHWEST NEW JERSEY.
ELSEWHERE...THE BEST CHANCE FOR STRONG OR POSSIBLY SEVERE
THUNDERSTORMS IS LATER THIS AFTERNOON INTO LATE THIS EVENING...
ESPECIALLY SOUTHEAST PENNSYLVANIA...EASTERN MARYLAND...DELAWARE
AND SOUTHERN NEW JERSEY.

BRIEF POOR DRAINAGE FLOODING RAINS MAY OCCUR WITH SEVERAL STRONG
STORMS TODAY AS WELL AS POCKETS OF LIGHTNING STRIKE OR WIND DAMAGE.

AFTER MIDNIGHT THIS COMING MONDAY NIGHT...THUNDERSTORMS SHOULD
WEAKEN AND BE FOCUSED MOSTLY ACROSS DELMARVA INTO SOUTHERN NEW
JERSEY. ISOLATED POOR DRAINAGE FLOODING RAINS MAY STILL BE
OCCURRING IN THE PREDAWN HOURS ALONG THE DELAWARE COAST.

THE HEAT INDEX MAY APPROACH 100 DEGREES FOR AN HOUR 2 THIS AFTERNOON
IN METRO PHILADELPHIA WITH A MAXIMUM HEAT INDEX OF 100 TO
103 DEGREES
EXPECTED IN EASTERN MARYLAND AND MUCH OF DELAWARE AND PARTS OF FAR
SOUTHERN NEW JERSEY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS POTENTIAL FOR POOR DRAINAGE FLOODING RAINS WEDNESDAY
ALONG WITH THUNDERSTORMS....ESPECIALLY TO THE SOUTH AND EAST OF
PHILADELPHIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

DEZ001>003-MDZ008-012-015-019-020-NJZ012-013-016>023-027-171630-
NEW CASTLE-KENT-INLAND SUSSEX-CECIL-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-MIDDLESEX-WESTERN MONMOUTH-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
SOUTHEASTERN BURLINGTON-
1229 PM EDT MON AUG 16 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN
DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW
JERSEY...NORTHERN NEW JERSEY AND SOUTHERN NEW JERSEY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE LATER THIS AFTERNOON
INTO LATE THIS EVENING... ESPECIALLY SOUTHEAST PENNSYLVANIA...
EASTERN MARYLAND...DELAWARE AND SOUTHERN NEW JERSEY.

BRIEF POOR DRAINAGE FLOODING RAINS MAY OCCUR WITH SEVERAL STRONG
STORMS TODAY AS WELL AS POCKETS OF LIGHTNING STRIKE OR WIND DAMAGE.

AFTER MIDNIGHT THIS COMING MONDAY NIGHT...THUNDERSTORMS SHOULD
WEAKEN AND BE FOCUSED MOSTLY ACROSS DELMARVA INTO SOUTHERN NEW
JERSEY. ISOLATED POOR DRAINAGE FLOODING RAINS MAY STILL BE
OCCURRING IN THE PREDAWN HOURS ALONG THE DELAWARE COAST.

THE HEAT INDEX MAY APPROACH 100 DEGREES FOR AN HOUR 2 THIS AFTERNOON
IN METRO PHILADELPHIA WITH A MAXIMUM HEAT INDEX OF 100 TO
103 DEGREES
EXPECTED IN EASTERN MARYLAND AND MUCH OF DELAWARE AND PARTS OF FAR
SOUTHERN NEW JERSEY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS POTENTIAL FOR POOR DRAINAGE FLOODING RAINS WEDNESDAY
ALONG WITH THUNDERSTORMS....ESPECIALLY TO THE SOUTH AND EAST OF
PHILADELPHIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON OR EVENING.

ANZ430-431-450>455-171630-
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-
1229 PM EDT MON AUG 16 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND
DELAWARE BAY WATERS.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERAL THUNDERSTORMS STORMS MAY PRODUCE 30 TO 40 KNOT WESTERLY
WIND GUSTS THIS AFTERNOON OR EARLY TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

DEZ004-NJZ014-024>026-171630-
DELAWARE BEACHES-EASTERN MONMOUTH-ATLANTIC COASTAL CAPE MAY-
COASTAL ATLANTIC-COASTAL OCEAN-
1229 PM EDT MON AUG 16 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN DELAWARE...CENTRAL
NEW JERSEY AND SOUTHERN NEW JERSEY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A MODERATE RISK OF RIP CURRENTS THROUGH THIS EVENING
ALONG THE NEW JERSEY COAST.

THERE IS A CHANCE FOR STRONG OR POSSIBLY SEVERE THUNDERSTORMS
LATER THIS AFTERNOON INTO LATE THIS EVENING.

BRIEF POOR DRAINAGE FLOODING RAINS MAY OCCUR WITH SEVERAL STRONG
STORMS LATE TODAY AS WELL AS POCKETS OF LIGHTNING STRIKE OR WIND
DAMAGE.

AFTER MIDNIGHT THIS COMING MONDAY NIGHT...THUNDERSTORMS SHOULD
WEAKEN AND BE FOCUSED MOSTLY ACROSS DELMARVA INTO SOUTHERN NEW
JERSEY. ISOLATED POOR DRAINAGE FLOODING RAINS MAY STILL BE
OCCURRING DURING THE PREDAWN HOURS ALONG THE DELAWARE COAST.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS POTENTIAL FOR POOR DRAINAGE FLOODING RAINS WEDNESDAY
ALONG WITH THUNDERSTORMS...ESPECIALLY COASTAL SOUTHERN NEW JERSEY
THROUGH COASTAL DELAWARE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Special weather statement, Aug 16, 4:27 PM EDT, 3 hours 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
427 PM EDT MON AUG 16 2010

NJZ009-010-012-013-015-162130-
HUNTERDON NJ-MERCER NJ-MIDDLESEX NJ-SOMERSET NJ-WESTERN MONMOUTH NJ-
427 PM EDT MON AUG 16 2010

...A STRONG THUNDERSTORM WILL AFFECT HUNTERDON...MERCER...
MIDDLESEX...MONMOUTH AND SOMERSET COUNTIES...

AT 426 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES NORTH OF TRENTON...MOVING EAST AT 20
MPH. THE THUNDERSTORM WILL BE NEAR SKILLMAN...LAWRENCEVILLE AROUND
435 PM...BELLE MEAD AROUND 440 PM...PRINCETON NORTH...PRINCETON
AROUND 445 PM...ROCKY HILL AROUND 450 PM...KINGSTON...PRINCETON
JUNCTION...EDINBURG AROUND 455 PM AND HEATHCOTE AROUND 500 PM.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

LAT...LON 4044 7422 4017 7429 4031 7490 4049 7486

Local storm report, Aug 16, 6:00 PM EDT, 1 hour 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
600 PM EDT MON AUG 16 2010

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

0455 PM     TSTM WND DMG     3 ENE PRINCETON JUNCTIO 40.34N 74.58W
08/16/2010                   MIDDLESEX          NJ   PUBLIC

            NUMEROUS TREES DOWN IN PLAINSBORO.

0505 PM     TSTM WND DMG     3 W CONCORDIA           40.31N 74.51W
08/16/2010                   MIDDLESEX          NJ   COUNTY OFFICIAL

            LARGE TREE LIMBS DOWN IN CRANBURY TOWNSHIP.

0525 PM     TSTM WND DMG     2 SSE CONCORDIA         40.29N 74.44W
08/16/2010                   MIDDLESEX          NJ   TRAINED SPOTTER

            LARGE TREE LIMBS DOWN AND PENNY SIZE HAIL REPORTED IN
            MONROE TOWNSHIP.

&&

KLINE

Local storm report, Aug 16, 6:31 PM EDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
631 PM EDT MON AUG 16 2010

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

0455 PM     TSTM WND DMG     3 ENE PRINCETON JUNCTIO 40.34N 74.58W
08/16/2010                   MIDDLESEX          NJ   PUBLIC

            NUMEROUS TREES DOWN IN PLAINSBORO.

0505 PM     TSTM WND DMG     3 W CONCORDIA           40.31N 74.51W
08/16/2010                   MIDDLESEX          NJ   COUNTY OFFICIAL

            LARGE TREE LIMBS DOWN IN CRANBURY TOWNSHIP.

0525 PM     TSTM WND DMG     2 SSE CONCORDIA         40.29N 74.44W
08/16/2010                   MIDDLESEX          NJ   TRAINED SPOTTER

            LARGE TREE LIMBS DOWN AND PENNY SIZE HAIL REPORTED IN
            MONROE TOWNSHIP.

0610 PM     HAIL             HONEY BROOK             40.09N 75.91W
08/16/2010  E0.88 INCH       CHESTER            PA   TRAINED SPOTTER

            NICKEL SIZE HAIL REPORTED IN HONEY BROOK.

&&

KLINE

Local storm report, Aug 16, 7:04 PM EDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EDT MON AUG 16 2010

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

0455 PM     TSTM WND DMG     3 ENE PRINCETON JUNCTIO 40.34N 74.58W
08/16/2010                   MIDDLESEX          NJ   PUBLIC

            NUMEROUS TREES DOWN IN PLAINSBORO.

0505 PM     TSTM WND DMG     3 W CONCORDIA           40.31N 74.51W
08/16/2010                   MIDDLESEX          NJ   COUNTY OFFICIAL

            LARGE TREE LIMBS DOWN IN CRANBURY TOWNSHIP.

0525 PM     TSTM WND DMG     2 SSE CONCORDIA         40.29N 74.44W
08/16/2010                   MIDDLESEX          NJ   TRAINED SPOTTER

            LARGE TREE LIMBS DOWN AND PENNY SIZE HAIL REPORTED IN
            MONROE TOWNSHIP.

0610 PM     HAIL             HONEY BROOK             40.09N 75.91W
08/16/2010  E0.88 INCH       CHESTER            PA   TRAINED SPOTTER

            NICKEL SIZE HAIL REPORTED IN HONEY BROOK.

0610 PM     TSTM WND DMG     HONEY BROOK             40.09N 75.91W
08/16/2010                   CHESTER            PA   COUNTY OFFICIAL

            TREES AND WIRES DOWN IN HONEY BROOK.

&&

KLINE

Local storm report, Aug 16, 7:34 PM EDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
734 PM EDT MON AUG 16 2010

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

0440 PM     TSTM WND DMG     3 NW PRINCETON JUNCTION 40.35N 74.66W
08/16/2010                   MERCER             NJ   NEWSPAPER

            NUMEROUS TREES DOWN IN PRINCETON.

0455 PM     TSTM WND DMG     3 ENE PRINCETON JUNCTIO 40.34N 74.58W
08/16/2010                   MIDDLESEX          NJ   PUBLIC

            NUMEROUS TREES DOWN IN PLAINSBORO.

0505 PM     TSTM WND DMG     3 W CONCORDIA           40.31N 74.51W
08/16/2010                   MIDDLESEX          NJ   COUNTY OFFICIAL

            LARGE TREE LIMBS DOWN IN CRANBURY TOWNSHIP.

0525 PM     TSTM WND DMG     2 SSE CONCORDIA         40.29N 74.44W
08/16/2010                   MIDDLESEX          NJ   TRAINED SPOTTER

            LARGE TREE LIMBS DOWN AND PENNY SIZE HAIL REPORTED IN
            MONROE TOWNSHIP.

0610 PM     HAIL             HONEY BROOK             40.09N 75.91W
08/16/2010  E0.88 INCH       CHESTER            PA   TRAINED SPOTTER

            NICKEL SIZE HAIL REPORTED IN HONEY BROOK.

0610 PM     TSTM WND DMG     HONEY BROOK             40.09N 75.91W
08/16/2010                   CHESTER            PA   COUNTY OFFICIAL

            TREES AND WIRES DOWN IN HONEY BROOK.

&&

KLINE

Special weather statement, Aug 16, 7:45 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT MON AUG 16 2010

DEZ001-NJZ016-017-021-PAZ067-070-170045-
CHESTER PA-CUMBERLAND NJ-DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-
SALEM NJ-
745 PM EDT MON AUG 16 2010

...A STRONG THUNDERSTORM WILL AFFECT CHESTER...CUMBERLAND...
DELAWARE...GLOUCESTER...NEW CASTLE AND SALEM COUNTIES...

AT 737 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES SOUTHEAST OF WEST CHESTER...MOVING
SOUTHEAST AT 20 MPH. THE THUNDERSTORM WILL BE NEAR MEDIA...ELSMERE...
NEWPORT AROUND 750 PM...BOOTHWYN...VILLAGE GREEN-GREEN RIDGE...
CLAYMONT...ARDENTOWN AROUND 755 PM...LINWOOD...MARCUS HOOK AND
TRAINER AROUND 800 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING
FROM THIS STORM.

LAT...LON 4003 7546 3991 7525 3988 7527 3985 7524
      3988 7518 3982 7509 3978 7509 3977 7506
      3971 7501 3944 7539 3964 7556 3969 7551
      3966 7555 3965 7556 3984 7573

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 3:03 PM EDT	Special Weather Statement	PHI	Hunterdon	57 min
Aug 16, 3:12 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	27 min
Aug 16, 4:27 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	63 min
Aug 16, 4:31 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	59 min
Aug 16, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	48 min
Aug 16, 5:30 PM EDT	Special Marine Warning	PHI		59 min
Aug 16, 3:55 PM EDT	Special Weather Statement	PHI	Berks	65 min
Aug 16, 4:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks	56 min
Aug 16, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	74 min
Aug 16, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Chester	55 min
Aug 16, 6:44 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	61 min

Nearby

Special Weather Statements in New Jersey, 2010 Special Weather Statements in Pennsylvania, 2010 Every special weather statement in 2010

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; radar from the NEXRAD Level II archive.