Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 151, NWS Philadelphia/Mount Holly

July 28, 2016Delaware County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2016, 2:30 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Gloucester County, New Jersey. It was in force for 45 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 28, 2016, 2:30 PM EDT (18:30 UTC)
Expired
Jul 28, 2016, 3:15 PM EDT
In force
45 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 57 km from the middle of the area, began a volume at 18:29 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 28, 1:27 PM EDTSevere Thunderstorm WatchSPC11 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.5 hours before the alert went out and 216 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, Brookhaven, NY at 12:00Z on 2016-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2016-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 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
19 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

383 
WUUS51 KPHI 281830
SVRPHI
NJC005-007-015-PAC045-091-101-281915-
/O.NEW.KPHI.SV.W.0151.160728T1830Z-160728T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
230 PM EDT THU JUL 28 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  EASTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 315 PM EDT

* AT 229 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
  CHESTER...OR 11 MILES WEST OF GLOUCESTER CITY...MOVING NORTHEAST
  AT 25 MPH. OTHER THUNDERSTORMS ARE DEVELOPING OVER THE AREA.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  PHILADELPHIA...CAMDEN...GLOUCESTER CITY...CHERRY HILL...EVESHAM...
  MOUNT LAUREL...CHESTER...WILLINGBORO...DEPTFORD...VOORHEES...
  MEDFORD...WEST DEPTFORD...GLASSBORO...LINDENWOLD...LUMBERTON...
  BELLMAWR...YEADON...WOODBURY...BURLINGTON AND MOUNT HOLLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3964 7516 3967 7520 3966 7523 3973 7536
      3991 7547 4017 7508 4012 7496 4008 7496
      4006 7498 4005 7497 4009 7486 3997 7466
TIME...MOT...LOC 1829Z 253DEG 45KT 3985 7534 

HAIL...<.75IN
WIND...60MPH
 
$$

JJM
1 follow-up statement
986 
WWUS51 KPHI 281901
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
301 PM EDT THU JUL 28 2016

PAC091-281909-
/O.CAN.KPHI.SV.W.0151.000000T0000Z-160728T1915Z/
MONTGOMERY PA-
301 PM EDT THU JUL 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY COUNTY
IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
SOUTHERN NEW JERSEY...AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3967 7511 3974 7526 3991 7541 4000 7522
      4006 7513 4005 7510 4008 7509 4013 7501
      4012 7496 4008 7496 4006 7498 4005 7497
      4009 7486 3997 7466
TIME...MOT...LOC 1859Z 233DEG 28KT 3999 7511 

$$

NJC005-007-015-PAC045-101-281915-
/O.CON.KPHI.SV.W.0151.000000T0000Z-160728T1915Z/
CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-DELAWARE PA-PHILADELPHIA PA-
301 PM EDT THU JUL 28 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN DELAWARE AND PHILADELPHIA COUNTIES...

AT 259 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
KENSINGTON...IN PHILADELPHIA...MOVING NORTHEAST AT 25 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...CAMDEN...GLOUCESTER CITY...CHERRY HILL...EVESHAM...
MOUNT LAUREL...CHESTER...WILLINGBORO...DEPTFORD...VOORHEES...
MEDFORD...WEST DEPTFORD...GLASSBORO...LINDENWOLD...LUMBERTON...
BELLMAWR...YEADON...WOODBURY...BURLINGTON AND MOUNT HOLLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...


TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM OVER SOUTH
PHILADELPHIA AND IMMEDIATE SURROUNDING AREAS OF SOUTHEAST
PENNSYLANIA AND SOUTHERN NEW JERSEY...AND MAY LEAD TO FLASH
FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3967 7511 3974 7526 3991 7541 4000 7522
      4006 7513 4005 7510 4008 7509 4013 7501
      4012 7496 4008 7496 4006 7498 4005 7497
      4009 7486 3997 7466
TIME...MOT...LOC 1859Z 233DEG 28KT 3999 7511 

HAIL...<.75IN
WIND...60MPH
 
$$

JJM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 12:58 PM EDTSevere Thunderstorm WarningPHIChester47 min
Jul 28, 1:24 PM EDTSevere Thunderstorm WarningPHIChester, Delaware51 min
Jul 28, 2:36 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia4 hr
Jul 28, 3:28 PM EDTSevere Thunderstorm WarningPHIBerks27 min
Jul 28, 3:41 PM EDTAreal Flood AdvisoryPHIBerks4 hr
Jul 28, 4:50 PM EDTAreal Flood AdvisoryPHIBerks4 hr
Jul 28, 2:03 PM EDTSpecial Marine WarningPHI57 min
Jul 28, 2:20 PM EDTSpecial Marine WarningPHI55 min
Jul 28, 3:04 PM EDTSpecial Marine WarningPHI116 min
Jul 28, 3:54 PM EDTAreal Flood AdvisoryPHIAtlantic, Cumberland, Gloucester, Salem4 hr
Jul 28, 3:58 PM EDTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean4 hr
Jul 28, 4:04 PM EDTSpecial Weather StatementPHISalem41 min
Jul 28, 4:46 PM EDTSpecial Weather StatementPHIAtlantic59 min
Jul 28, 5:05 PM EDTSpecial Marine WarningPHI85 min
Jul 28, 5:17 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Ocean4 hr
Jul 28, 6:12 PM EDTSevere Thunderstorm WarningPHICape May63 min
Jul 28, 6:23 PM EDTSpecial Marine WarningPHI67 min
Jul 28, 6:38 PM EDTSpecial Marine WarningPHI97 min
Jul 28, 6:48 PM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland4 hr
Jul 28, 6:51 PM EDTSevere Thunderstorm WarningPHICape May28 min
Jul 28, 6:56 PM EDTSpecial Marine WarningPHI64 min
Jul 28, 7:32 PM EDTSpecial Marine WarningPHI88 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2016Severe Thunderstorm Warnings in New Jersey, 2016Every severe thunderstorm warning in 2016

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.