Alert archive / New Jersey / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 18, 2011Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 18, 2011, 6:33 PM EDT for Mercer County, New Jersey. It was in force for 57 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 18, 2011, 6:33 PM EDT (22:33 UTC)
Expired: Aug 18, 2011, 7:30 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 22:33 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, 10.6 hours before the alert went out and 148 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: 780 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1022 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

277 
WWUS81 KPHI 182233
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
633 PM EDT THU AUG 18 2011

NJZ010-012-015-PAZ069-182330-
BUCKS PA-MERCER NJ-MIDDLESEX NJ-SOMERSET NJ-
633 PM EDT THU AUG 18 2011

...A STRONG THUNDERSTORM WILL AFFECT BUCKS...MERCER...MIDDLESEX AND
SOMERSET COUNTIES...

AT 628 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES WEST OF TRENTON...MOVING NORTHEAST AT 10
MPH. THE THUNDERSTORM WILL BE NEAR WOODSIDE...FAIRLESS HILLS AROUND
645 PM...YARDLEY...EWING AROUND 700 PM...TRENTON...PENNINGTON AROUND
715 PM...LAWRENCEVILLE AND MERCERVILLE-HAMILTON SQUARE AROUND 730 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.

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

EXPECT INTENSE LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER
TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

LAT...LON 4028 7450 4013 7488 4024 7502 4034 7488
      4034 7486 4036 7486 4038 7483 4038 7482
      4041 7479 4041 7476 4044 7476 4047 7472

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 4:53 AM EDT	Special Weather Statement	PHI	Morris, Somerset, Sussex	52 min
Aug 18, 6:35 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Morris and 2 more	3 hr
Aug 18, 7:29 AM EDT	Special Weather Statement	PHI	Camden, Gloucester	61 min
Aug 18, 8:16 AM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	59 min
Aug 18, 8:57 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Monmouth and 1 more	3 hr
Aug 18, 3:12 PM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	29 hr
Aug 18, 3:32 PM EDT	Special Weather Statement	PHI	Burlington	58 min
Aug 18, 3:50 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	51 min
Aug 18, 4:17 PM EDT	Special Weather Statement	PHI	Monmouth	58 min
Aug 18, 4:55 PM EDT	Special Weather Statement	PHI	Burlington	65 min
Aug 18, 5:20 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	33 min
Aug 18, 6:12 PM EDT	Special Weather Statement	PHI	Middlesex	63 min
Aug 18, 7:34 PM EDT	Special Weather Statement	PHI	Monmouth	56 min
Aug 18, 7:37 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	53 min
Aug 18, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	62 min
Aug 18, 7:47 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	3 hr
Aug 18, 7:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	61 min
Aug 18, 2:57 AM EDT	Special Weather Statement	PHI	Berks	63 min
Aug 18, 3:53 AM EDT	Special Weather Statement	PHI	Berks	52 min
Aug 18, 4:48 AM EDT	Special Weather Statement	PHI	Chester, Montgomery	57 min
Aug 18, 5:45 AM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	60 min
Aug 18, 6:04 AM EDT	Special Weather Statement	PHI	Berks, Chester	41 min
Aug 18, 9:29 AM EDT	Areal Flood Advisory	PHI	Delaware	2 hr
Aug 18, 5:30 PM EDT	Special Weather Statement	PHI	Monroe	60 min
Aug 18, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester	57 min
Aug 18, 6:18 PM EDT	Special Weather Statement	PHI	Chester	57 min
Aug 18, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	Chester	66 min
Aug 18, 6:59 PM EDT	Flash Flood Warning	PHI	Chester	2 hr
Aug 18, 7:14 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	50 min
Aug 18, 7:28 PM EDT	Special Weather Statement	PHI	Chester	62 min
Aug 18, 7:31 PM EDT	Special Weather Statement	PHI	Monroe	59 min
Aug 18, 7:58 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	31 min
Aug 18, 6:04 PM EDT	Areal Flood Advisory	PHI	Cecil	116 min
Aug 18, 6:44 PM EDT	Special Weather Statement	PHI	New Castle	61 min

Nearby

Special Weather Statements in New Jersey, 2011 Every special weather statement in 2011

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.