Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 267, NWS Philadelphia/Mount Holly

August 27, 2020Bucks County, Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2020, 8:29 PM EDT for Bucks County, Pennsylvania; 5 counties in New Jersey. It was in force for 46 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 27, 2020, 8:29 PM EDT (00:29 UTC)
Expired
Aug 27, 2020, 9:15 PM EDT
In force
46 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 00:30 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.

What was reported inside it

TimeReportWhereRemark
Aug 27, 8:54 PM EDTMARINE TSTM WIND 558 S Seagate, NYA MARINE THUNDERSTORM WIND GUST OF 48 KNOTS WAS REPORTED AT AN ELEVATION OF 18 FT
Aug 27, 8:54 PM EDTTSTM WND GST 55Sandy Hook, NJWEATHERFLOW GAUGE AT SANDY HOOK.
Aug 27, 9:02 PM EDTTSTM WND DMG1 Sw Kendall Park, NJDOWNED TREES AND WIRES NEAR STEVENS ROAD IN KENDALL PARK. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.5 hours before the alert went out and 128 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 00:00Z on 2020-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 709 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 00:00Z on 2020-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -140 square meters per square second.19395878Sfc1 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
709 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-140 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.6

Open this sounding in Storm Lab

The text

As transmitted.

473 
WUUS51 KPHI 280029
SVRPHI
NJC019-021-023-025-035-PAC017-280115-
/O.NEW.KPHI.SV.W.0267.200828T0029Z-200828T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
829 PM EDT Thu Aug 27 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  East central Bucks County in southeastern Pennsylvania...

* Until 915 PM EDT.

* At 828 PM EDT, severe thunderstorms were located along a line
  extending from Oakwood to near Far Hills to Pleasant Valley, moving
  southeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Trenton, New Brunswick, Perth Amboy, Long Branch, Asbury Park,
  Somerville, Sandy Hook, Somerset, Edison, Middletown, Old Bridge,
  East Brunswick, Bridgewater, South Brunswick, Sayreville, North
  Brunswick, Marlboro, Manalapan, Ewing and Carteret.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 13.
 Interstate 78 in New Jersey between mile markers 14 and 40.
 Interstate 195 in New Jersey between mile markers 0 and 6.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 0 and 24.
 Garden State Parkway between mile markers 102 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...



For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4021 7397 4023 7432 4016 7487 4062 7503
      4070 7467 4065 7452 4065 7441 4063 7442
      4060 7446 4060 7421 4056 7421 4050 7428
      4047 7427 4044 7420 4045 7413 4041 7398
      4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 0028Z 328DEG 24KT 4054 7410 4065 7463 4054 7528 

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

NC
2 follow-up statements
104 
WWUS51 KPHI 280055
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
855 PM EDT Thu Aug 27 2020

NJC019-021-023-025-035-PAC017-280115-
/O.CON.KPHI.SV.W.0267.000000T0000Z-200828T0115Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
855 PM EDT Thu Aug 27 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOMERSET...MONMOUTH...MIDDLESEX
AND EAST CENTRAL BUCKS COUNTIES...

At 855 PM EDT, severe thunderstorms were located along a line
extending from Highlands to Somerset to near Pipersville, moving
southeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Trenton, New Brunswick, Perth Amboy, Long Branch, Asbury Park,
Somerville, Sandy Hook, Somerset, Edison, Middletown, Old Bridge,
East Brunswick, Bridgewater, South Brunswick, Sayreville, North
Brunswick, Marlboro, Manalapan, Ewing and Carteret.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 13.
 Interstate 78 in New Jersey between mile markers 14 and 40.
 Interstate 195 in New Jersey between mile markers 0 and 6.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 0 and 24.
 Garden State Parkway between mile markers 102 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4021 7397 4023 7432 4016 7487 4062 7503
      4070 7467 4065 7452 4065 7441 4063 7442
      4060 7446 4060 7421 4056 7421 4050 7428
      4047 7427 4044 7420 4045 7413 4041 7398
      4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 0055Z 328DEG 24KT 4039 7398 4050 7451 4039 7515 

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

NC
078 
WWUS51 KPHI 280112
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
912 PM EDT Thu Aug 27 2020

NJC019-021-023-025-035-PAC017-280122-
/O.EXP.KPHI.SV.W.0267.000000T0000Z-200828T0115Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
912 PM EDT Thu Aug 27 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON...
MERCER...SOMERSET...MONMOUTH...MIDDLESEX AND EAST CENTRAL BUCKS
COUNTIES WILL EXPIRE AT 915 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 4021 7397 4023 7432 4016 7487 4062 7503
      4070 7467 4065 7452 4065 7441 4063 7442
      4060 7446 4060 7421 4056 7421 4050 7428
      4047 7427 4044 7420 4045 7413 4041 7398
      4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 0112Z 328DEG 24KT 4039 7398 4050 7451 4039 7515 

$$

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 8:13 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton47 min
Aug 27, 8:26 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery26 min
Aug 28, 3:22 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery53 min
Aug 28, 3:33 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Lehigh, Montgomery101 min
Aug 28, 3:36 PM EDTSevere Thunderstorm WarningPHIBerks, Chester54 min
Aug 28, 3:52 PM EDTSevere Thunderstorm WarningPHIChester, Delaware53 min
Aug 28, 3:56 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia49 min
Aug 28, 4:01 PM EDTSevere Thunderstorm WarningPHIChester, Delaware44 min
Aug 28, 4:39 PM EDTSevere Thunderstorm WarningPHIDelaware, Montgomery, Philadelphia66 min
Aug 27, 8:24 PM EDTSpecial Weather StatementPHIMiddlesex, Somerset51 min
Aug 27, 8:55 PM EDTSpecial Marine WarningPHI95 min
Aug 27, 9:13 PM EDTSpecial Weather StatementPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset47 min
Aug 27, 9:28 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth, Ocean, Somerset47 min
Aug 28, 3:05 PM EDTSpecial Marine WarningPHI85 min
Aug 28, 3:41 PM EDTSpecial Weather StatementPHISalem34 min
Aug 28, 3:53 PM EDTSpecial Marine WarningPHI67 min
Aug 28, 4:07 PM EDTSpecial Marine WarningPHI53 min
Aug 28, 4:17 PM EDTSevere Thunderstorm WarningPHICape May43 min
Aug 28, 4:29 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer61 min
Aug 28, 4:49 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean56 min
Aug 28, 4:55 PM EDTSpecial Marine WarningPHI95 min
Aug 28, 5:13 PM EDTSpecial Marine WarningPHI92 min
Aug 28, 5:28 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more47 min
Aug 28, 5:37 PM EDTSpecial Marine WarningPHI83 min
Aug 28, 5:51 PM EDTSpecial Marine WarningPHI84 min
Aug 28, 6:53 PM EDTSpecial Marine WarningPHI64 min
Aug 28, 7:55 PM EDTSpecial Marine WarningPHI65 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020Severe Thunderstorm Warnings in Pennsylvania, 2020Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.