Alert archive / Pennsylvania / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

August 16, 2010Chester County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 16, 2010, 9:52 PM EDT for Chester County, Pennsylvania; New Castle County, Delaware. It was in force for 113 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, 9:52 PM EDT (01:52 UTC)
Expired: Aug 16, 2010, 11:45 PM EDT
In force: 113 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Chester County, PA

The radar

The Dover AFB radar (KDOX), 118 km from the middle of the area, began a volume at 01:54 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.9 hours before the alert went out and 164 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: 4379 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 9.3

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, 8:48 PM EDT, 1 hour 4 minutes earlier.

Area forecast discussion, Aug 16, 8:48 PM EDT, 1 hour 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
848 PM EDT MON AUG 16 2010

.SYNOPSIS...
A COLD FRONT MOVING SLOWLY SOUTHEAST ACROSS THE AREA TONIGHT WILL
TRIGGER SHOWERS AND THUNDERSTORMS. THE FRONT WILL BECOME NEARLY
STATIONARY ACROSS SOUTHERN DELAWARE ON TUESDAY. A WAVE OF LOW
PRESSURE WILL MOVE NORTHEAST ALONG THE FRONT WEDNESDAY AND
WEDNESDAY NIGHT RESULTING IN MORE RAIN. WEAK HIGH PRESSURE WILL
COVER THE AREA ON THURSDAY AND FRIDAY BUT ANOTHER FRONTAL SYSTEM
MAY BRING MORE PRECIP FOR THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
AS PER SWOMCD THE WATCH BOX WILL BE ALLOWED TO EXPIRE AT 9 PM.
WE KEPT THE MENTION OF HEAVY RAIN WITH THE LWR SUSQ VALLEY TSRA
CLUSTER FOR THE EVE MAINLY IN THE PHL NW SUBURBS.

AS IS OFTEN THE CASE AROUND HERE, WITH THE SEPARATION OF THE BEST
SHEAR AND HIEST CAPES, THE STORMS THAT WENT SEVERE HAD TO BE
PRETTY VIGOROUS AND NEEDED ABOUT 3000J OF ENERGY TO GET THERE.
WHILE THE FRONT IS YET TO MOVE THROUGH, ITS GOING TO BE DIFFICULT
FOR STORMS TO BECOME SEVERE FOR MUCH LONGER. CONVERSELY THERE IS
ENOUGH INSTABILITY, THE FRONT ITSELF AND OUTFLOWS AROUND TO KEEP
TSRA CHANCES GOING INTO THE NIGHT. HAVE NOT ADDED PATCHY FOG YET,
WAITING TO SEE HOW MUCH PCPN FALLS THE REST OF THE EVENING. A
SLIGHT TWEAK TO THE MIN TEMPS WAS TO RAISE THEM SLIGHTLY IN THE
SERN PART OF OUR CWA AS PER HOW HUMID THE AIR CURRENTLY IS AND THE
LATEST 18Z GUIDANCE NOT FORECASTING ANY MIXING UNTIL AFTER
SUNRISE.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/...
THE COLD FRONT IS FCST TO MOVE SLOWLY SEWD THRU THE FCST AREA
TONIGHT AND BECOMES Q-STNRY ACRS SRN DELAWARE AND PSBLY SRN NJ BY
TUE MORNING. THE FRONT SHOULD BECOME LESS ACTIVE BY THEN WITH A
MORE STABILIZED AMS AND NO OBVIOUS UPPER-LVL FORCING IN THE AREA.
HWVR...WITH CONTD LOW-LVL CNVGNC IT SEEMS PRUDENT TO KEEP AT LEAST
A LOW CHC POP OVER DELMARVA FOR TUE.

TUE NIGHT SHOULD SEE SLIGHTLY HIGHER POPS OVER SRN AREAS AS A WAVE
STARTS TO DVLP ON THE FRONT. THE MAIN EFFECTS THO SHOULD BE ON WED
AND WED NIGHT AS THE WAVE OF LOW PRESSURE MOVES ACROSS THE AREA.
THERE ARE SOME DIFFERENCES IN LOCATION WITH GFS AND LATEST ECMWF
BEING FURTHER S THAN THAN THE NAM...BUT EITHER WAY THE FCST AREA
SHOULD HOPEFULLY SEE SOME NEEDED RAIN FROM THIS SYSTEM.

DEPENDENT ON TIMING...SOME PRECIP MAY LINGER OVER THE AREA THU
MORNING BUT MUCH OF THE DAY SHOULD BE DRY WITH NEAR NORMAL TEMPS.

A BLEND OF MAV/MET GUIDANCE WAS GENERALLY USED FOR MAX/MIN TEMPS
DURING THIS PERIOD.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
OUR CWA IS EXPECTED TO BE MORE DEEPLY ENSCONCED IN THE WESTERLY
FLOW THROUGH THIS PERIOD. THE 500MB HEAT RIDGE WILL REMAIN EITHER
IN THE SOUTHERN ROCKIES OR CENTRAL PLAINS THROUGH THE PERIOD.
WHILE OUR WEATHER WILL NOT BE COOLER THAN NORMAL, DISTURBANCES
WITHIN THE WESTERLY/NORTHWESTERLY FLOW WILL GIVE US SOME
LEGITIMATE PRECIPITATION CHANCES.

THERE WERE MODEL TIMING DIFFERENCES WRT TO THE WAVE ON THE FRONT IN
THE SHORT TERM, BUT OTHER THAN THE CAN GGEM, ALL OF THEM HAVE THE
LOW PRESSURE SYSTEM SUFFICIENTLY OFFSHORE TO START THU NGT AS DRY. A
SECONDARY COLD FRONT IS FORECAST TO MOVE THROUGH THE CWA ON FRIDAY.
MODEL FCST SOUNDINGS THOUGH ARE TOO DRY AND WE ARE NOT CARRYING ANY
PCPN CHANCES.

THE NEXT PCPN CHANCES ALONG WITH MORE HUMID WEATHER COME FRIDAY
NIGHT INTO SATURDAY AS A WARM FRONT IS FORECAST TO MOVE THROUGH OUR
CWA. PRECIP THREAT WILL CONTINUE INTO SUNDAY PRECEDING AND
ACCOMPANYING A COLD FRONT FROM THE MIDWEST. AS OF TODAY IT IS
POSITIONED FAIRLY WELL TO MAXIMIZE SHRA AND TSRA CHANCES ACROSS THE
NW HALF OF OUR CWA.

THEN FAIR AND DRIER WEATHER SHOULD RETURN ON MONDAY. THE LATEST
ECMWF IS MUCH SLOWER WITH THE SUNDAY/MONDAY EVOLUTION OF THE COLD
FRONT. OVER THE LAST COUPLE OF MONTHS IF IT HAS HAD A BIAS, ITS
BEEN A SLOW TIMING ONE. THE LATEST UKMET IS MORE LINE WITH THE GFS
THAN THE ECMWF. THE FCST 500MB FLOW IS MORE NW THAN IT WILL BE AT
THE START OF THE LONG TERM. THIS SHOULD BRING RELATIVELY DRIER, LESS
HUMID AIR INTO OUR CWA FOR THE START OF THE NEXT WORK WEEK IF NOT
MONDAY, THEN TUESDAY.

WE DID NOT SWAY MUCH FROM MEX OR HPC GUIDE WRT TO TEMPS. WANT TO SEE
IF WE GET SOME BENEFICIAL OR MAYBE TOO MUCH OF A BENEFICIAL RAIN
OVER THE NEXT COUPLE OF DAYS. WITHOUT IT AND AS LONG AS IT HAS NOT
BEEN COMPLETELY CLOUDY, MAX TEMPS HAVE BEEN RUNNING TOWARD THE HIGH
END OF THE GUIDANCE ENVELOPE.

&&

.AVIATION /01Z TUESDAY THROUGH SATURDAY/...
THE LATEST TAFS WILL CARRY TSRAS AROUND THE LOCAL KPHL AREA DURING
THE FIRST HOUR OR SO. BEYOND THIS AREA AND IN TIME THE COLD FRONT
HAS YET TO PASS THE REGION, BUT THE AREAL EXTENT OF THE OTHER
CONVECTION IS TOO WIDELY SCATTERED TO HAVE CONFIDENCE THAT A TSRA
WILL AFFECT THE OTHER TERMINALS AND WILL ONLY MENTION A CB CLOUD
TYPE THRU THE REST OF THE EVENING FROM THE KPHL AREA TERMINALS SE.

THE FRONT IS SLOWING AND MORE VFR MID AND HIGH LEVEL DEBRIS
CLOUDINESS WILL AFFECT THE AREA THROUGH THE NIGHT. SINCE WE ARE
EXPECTING COVERAGE TO DIMINISH OVERNIGHT, WE BROUGHT MOST OF THE
TERMINALS TO MVFR CONDITIONS DUE TO FOG TOWARD MORNING. THE
EXCEPTION WAS KRDG WHICH WE BRING DOWN TO IFR.

THE FRONT SHOULD CLEAR TERMINALS BY 12Z ON TUESDAY AND GOOD VFR
CONDITIONS ARE EXPECTED TO PREVAIL FOR THE REST OF THE TAF
FORECAST PERIOD. WINDS SHOULD GENERALLY BE LIGHT AS SPEEDS SHOULD
AVERAGE 10 KNOTS OR LESS. BECAUSE OF THIS, THE SEA BREEZE FRONT
SHOULD MAKE IT INTO KACY AND KMIV BEFORE THE AFTERNOON ENDS ON
TUESDAY.

OUTLOOK...
THE FRONTAL BOUNDARY IS STALLED NEARBY THROUGH WEDNESDAY AND MAY BE
ABLE TO FOCUS SOME SHOWERS AND THUNDERSTORMS, MAINLY SOUTH OF ALL OF
OUR TERMINALS. AN AREA OF LOW PRESSURE HOWEVER IS FORECAST TO
DEVELOP AND TRACK ALONG THE FRONT WEDNESDAY INTO THURSDAY. THIS MAY
PRODUCE A MORE WIDESPREAD RAIN WITH EMBEDDED THUNDERSTORMS ACROSS A
PORTION OF THE AREA, WITH AREAS OF HEAVY RAIN POSSIBLE. THERE IS
SOME UNCERTAINTY HOWEVER ON THE TIMING AND LOCATION OF THE MORE
ORGANIZED CORRIDOR OF PRECIPITATION. A WEAK AREA OF HIGH PRESSURE
THEN BUILDS IN FOR FRIDAY, HOWEVER A FRONTAL BOUNDARY MAY SETTLE
INTO OUR AREA FRIDAY NIGHT AND LINGER SATURDAY.

&&

.MARINE...
A COLD FRONT WILL BE ARRIVING IN OUR AREA TONIGHT WITH A
SOUTHERLY FLOW AHEAD OF IT. THE LOW-LEVEL FLOW HAS INCREASED AHEAD
OF THE FRONT, HOWEVER AN INVERSION OVER THE WATER AS HOTTER AIR
ADVECTS IN IS KEEPING THE SURFACE WINDS IN THE 10 TO 15 KNOT
RANGE. SOME GUSTS HAVE BEEN APPROACHING 20 KNOTS, HOWEVER THAT
SHOULD BE THE UPPER END OF THE GUSTINESS THROUGH TONIGHT WITHIN
THE SYNOPTIC REGIME. SOME SHOWERS AND THUNDERSTORMS SHOULD CROSS
THE AREA TONIGHT AS THE FRONT SETTLES THROUGH, AND PERHAPS LOCALLY
GUSTY WINDS MAY RESULT FROM THE CONVECTION. THE FRONT LOOKS TO
STALL NEARBY ESPECIALLY ACROSS OUR SOUTHERN WATERS TUESDAY AND
WEDNESDAY. THE TRUE DEFINITION OF THE FRONT WILL DETERMINE THE
OVERALL WIND DIRECTION, HOWEVER A SHIFT TO THE NORTHWEST SHOULD
OCCUR BEHIND THE FRONT MAINLY ACROSS THE NORTHERN COASTAL WATERS
AND PARTS OF DELAWARE BAY LATE TONIGHT AND TUESDAY MORNING.
OTHERWISE, THE FLOW APPEARS LIGHT ENOUGH TUESDAY WHERE A SOUTHERLY
WIND BECOMES DOMINANT AND IT COULD BE ENHANCED SOME NEARSHORE BY A
SEA BREEZE CIRCULATION.

AN AREA OF LOW PRESSURE IS FORECAST TO TRACK ALONG THIS FRONT
WEDNESDAY INTO THURSDAY. THIS SURFACE LOW DOES NOT APPEAR TO BE REAL
VIGOROUS, HOWEVER THE LOW-LEVEL FLOW WILL TURN ONSHORE AHEAD OF IT.
ATTM, WE ARE NOT ANTICIPATING THE WINDS TO RAMP UP TO ADVISORY
CRITERIA AND THE LENGTH OF TIME THAT THE ONSHORE FLOW OCCURS APPEARS
SHORT ENOUGH TO NOT BUILD THE SEAS TO MUCH. AS A RESULT, WE
MAINTAINED CONDITIONS BELOW ADVISORY CRITERIA THROUGH THE PERIOD.
THE SURFACE LOW MAY BRING WIDESPREAD SHOWERS AND THUNDERSTORMS TO
THE AREA, WITH THE POTENTIAL FOR A STEADIER RAIN WEDNESDAY INTO
THURSDAY. THERE ARE HOWEVER SOME TIMING AND PLACEMENT UNCERTAINTIES
REGARDING THE MAIN PRECIPITATION. HIGH PRESSURE RETURNS FOR FRIDAY,
ALTHOUGH A FRONTAL BOUNDARY MAY SETTLE INTO THE AREA FRIDAY NIGHT
AND SATURDAY.

&&

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

&&

SYNOPSIS...AMC
NEAR TERM...AMC/GIGI
SHORT TERM...AMC
LONG TERM...GIGI
AVIATION...GORSE
MARINE...GORSE

Hazardous weather outlook, Aug 16, 8:51 PM EDT, 1 hour 1 minute before

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

DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>023-027-
PAZ054-055-060>062-067>071-180100-
NEW CASTLE-KENT-INLAND SUSSEX-CECIL-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
851 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...NORTHWEST NEW JERSEY...SOUTHERN NEW
JERSEY...EAST CENTRAL PENNSYLVANIA...NORTHEAST PENNSYLVANIA AND
SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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 IS NOT EXPECTED AT THIS TIME.

ANZ430-431-450>455-180100-
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-
851 PM EDT MON AUG 16 2010

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

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ004-NJZ014-024>026-180100-
DELAWARE BEACHES-EASTERN MONMOUTH-ATLANTIC COASTAL CAPE MAY-
COASTAL ATLANTIC-COASTAL OCEAN-
851 PM EDT MON AUG 16 2010

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

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Aug 16, 6:00 PM EDT, 3 hours 52 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, 3 hours 21 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, 2 hours 48 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, 2 hours 18 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, 2 hours 7 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

Special weather statement, Aug 16, 9:52 PM EDT, 0 minutes before

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

DEZ001-MDZ008-NJZ016-PAZ060-067-068-070-170345-
BERKS PA-CECIL MD-CHESTER PA-DELAWARE PA-MONTGOMERY PA-NEW CASTLE DE-
SALEM NJ-
952 PM EDT MON AUG 16 2010

...A FEW STRONG THUNDERSTORMS WILL AFFECT BERKS...CECIL...
   CHESTER...DELAWARE...MONTGOMERY...NEW CASTLE AND SALEM COUNTIES...

AT 947 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF STRONG THUNDERSTORMS ACROSS YORK AND LANCASTER COUNTIES
WHICH WERE MOVING EAST AT AROUND 20 MPH. THESE THUNDERSTORMS WILL
CONTINUE TO MOVE EASTWARD AFFECTING METRO PHILADELPHIA BEFORE 1130
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 3973 7615 3978 7607 3987 7601 3992 7601
      4003 7595 4011 7595 4014 7590 4030 7612
      4039 7549 3953 7539 3953 7553 3958 7554
      3958 7556 3951 7558 3964 7616 3972 7624

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 12:19 AM EDT	Special Weather Statement	PHI	Monmouth	41 min
Aug 17, 1:29 PM EDT	Special Weather Statement	PHI	Atlantic	61 min
Aug 17, 1:32 PM EDT	Special Marine Warning	PHI		88 min
Aug 17, 2:42 PM EDT	Special Weather Statement	PHI	Atlantic	63 min
Aug 17, 2:58 PM EDT	Special Marine Warning	PHI		2 hr
Aug 17, 3:27 PM EDT	Areal Flood Advisory	PHI	Atlantic	2 hr
Aug 17, 3:40 PM EDT	Special Marine Warning	PHI		95 min
Aug 17, 3:58 PM EDT	Flash Flood Warning	PHI	Atlantic	3 hr
Aug 16, 11:28 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	62 min
Aug 17, 1:23 PM EDT	Special Weather Statement	PHI	Sussex	82 min
Aug 17, 2:21 PM EDT	Areal Flood Advisory	PHI	Sussex	114 min
Aug 17, 2:36 PM EDT	Flash Flood Warning	PHI	Sussex	2 hr
Aug 17, 3:21 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Aug 17, 4:23 PM EDT	Special Weather Statement	PHI	Sussex	112 min

Nearby

Special Weather Statements in Pennsylvania, 2010 Special Weather Statements in Delaware, 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.