Alert archive / New Jersey / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 15, 2012Mercer County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 15, 2012, 9:21 PM EDT for Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 54 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
Jul 15, 2012, 9:21 PM EDT (01:21 UTC)
Expired
Jul 15, 2012, 10:15 PM EDT
In force
54 min
Issued by
NWS Philadelphia/Mount Holly

Counties Mercer County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 01:22 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.4 hours before the alert went out and 261 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 00:00Z on 2012-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1876 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2012-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1876 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
102 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.

122 
WWUS81 KPHI 160121
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
921 PM EDT SUN JUL 15 2012

NJZ009-010-012-013-015-019-PAZ068-069-071-160215-
BUCKS PA-HUNTERDON NJ-MERCER NJ-MIDDLESEX NJ-MONTGOMERY PA-
NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-SOMERSET NJ-
WESTERN MONMOUTH NJ-
921 PM EDT SUN JUL 15 2012

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT BUCKS... 
BURLINGTON...HUNTERDON...MERCER...MIDDLESEX...MONMOUTH...
MONTGOMERY...PHILADELPHIA AND SOMERSET COUNTIES...

AT 918 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A A 
CLUSTER OF STRONG THUNDERSTORM 12S MILES NORTH OF PHILADELPHIA... 
MOVING EAST AT 30 MPH. THE THUNDERSTORM WILL BE NEAR HORSHAM... 
WARMINSTER HEIGHTS AROUND 930 PM...VILLAGE SHIRES...CHURCHVILLE 
AROUND 945 PM...TRENTON...MORRISVILLE AROUND 1000 PM... 
MERCERVILLE-HAMILTON SQUARE AND WHITE HORSE AROUND 1015 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 4017 7441 4014 7445 4002 7525 4031 7536
      4046 7445 4017 7436

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 8:04 PM EDTSpecial Weather StatementPHIAtlantic56 min
Jul 15, 8:11 PM EDTSpecial Weather StatementPHIGloucester, Salem64 min
Jul 15, 8:35 PM EDTSpecial Weather StatementPHIMercer, Middlesex, Monmouth55 min
Jul 15, 8:39 PM EDTSpecial Marine WarningPHI66 min
Jul 15, 8:58 PM EDTSpecial Weather StatementPHIBurlington, Camden62 min
Jul 15, 9:00 PM EDTSpecial Weather StatementPHIBurlington60 min
Jul 15, 9:33 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth57 min
Jul 15, 9:45 PM EDTSpecial Marine WarningPHI60 min
Jul 15, 9:52 PM EDTSpecial Weather StatementPHIOcean68 min
Jul 15, 9:55 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Mercer, Monmouth, Ocean80 min
Jul 15, 10:14 PM EDTSpecial Marine WarningPHI79 min
Jul 15, 10:51 PM EDTSpecial Weather StatementPHIAtlantic, Camden, Gloucester, Salem54 min
Jul 15, 11:25 PM EDTSpecial Weather StatementPHIAtlantic, Ocean65 min
Jul 16, 3:35 AM EDTHeat AdvisoryPHIBurlington, Hunterdon, Middlesex, Monmouth, Morris, Ocean and 3 more62 hr
Jul 15, 8:27 PM EDTSpecial Weather StatementPHIChester, Montgomery, Philadelphia63 min
Jul 15, 8:30 PM EDTSevere Thunderstorm WarningPHIChester45 min
Jul 15, 9:16 PM EDTSpecial Weather StatementPHIChester59 min
Jul 15, 8:08 PM EDTSpecial Weather StatementPHINew Castle67 min
Jul 16, 4:32 PM EDTSpecial Weather StatementPHISussex88 min

Nearby

Special Weather Statements in New Jersey, 2012Special Weather Statements in Pennsylvania, 2012Every special weather statement in 2012

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.