Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 142, NWS Philadelphia/Mount Holly

July 8, 2021Hunterdon County, Morris County, Somerset County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 1:49 PM EDT for Hunterdon County, Morris County, Somerset County, New Jersey; Bucks County, Pennsylvania. It was in force for 41 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 8, 2021, 1:49 PM EDT (17:49 UTC)
Expired
Jul 8, 2021, 2:30 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 17:52 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

Brookhaven, NY (KOKX), launched 12:00Z, 5.8 hours before the alert went out and 180 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 2021-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 973 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, Brookhaven, NY at 12:00Z on 2021-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
973 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
751 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

423 
WUUS51 KPHI 081749
SVRPHI
NJC019-027-035-PAC017-081830-
/O.NEW.KPHI.SV.W.0142.210708T1749Z-210708T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
149 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Southwestern Morris County in northern New Jersey...
  Southwestern Somerset County in northern New Jersey...
  North central Bucks County in southeastern Pennsylvania...

* Until 230 PM EDT.

* At 149 PM EDT, a severe thunderstorm was located over Ottsville, or
  14 miles south of Easton, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Byram, Bedminster, Flemington, Tinicum, High Bridge, Clinton, New
  Hope, Dublin, Glen Gardner, Ferndale, Hampton, Frenchtown, Lebanon,
  Milford, Califon, Bloomsbury, Riegelsville, Stockton, Pleasant
  Valley and Flagtown.

This includes Interstate 78 in New Jersey between mile markers 7 and
27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7474 4042 7480 4039 7481 4038 7486
      4035 7491 4033 7519 4053 7533 4060 7519
      4059 7518 4063 7515 4070 7502 4069 7500
      4075 7494 4081 7481 4048 7460
TIME...MOT...LOC 1749Z 231DEG 21KT 4049 7513 

HAIL...1.00IN
WIND...60MPH
 
$$

NC
1 follow-up statement
844 
WWUS51 KPHI 081813
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
213 PM EDT Thu Jul 8 2021

NJC019-027-035-PAC017-081830-
/O.CON.KPHI.SV.W.0142.000000T0000Z-210708T1830Z/
Hunterdon NJ-Morris NJ-Somerset NJ-Bucks PA-
213 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR HUNTERDON...SOUTHWESTERN MORRIS...SOUTHWESTERN SOMERSET AND NORTH
CENTRAL BUCKS COUNTIES...

At 213 PM EDT, a severe thunderstorm was located near Frenchtown, or
14 miles southeast of Easton, moving northeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Byram, Flemington, Tinicum, High Bridge, Clinton, Glen Gardner,
Ferndale, Hampton, Frenchtown, Lebanon, Milford, Califon, Bloomsbury,
Riegelsville, Stockton, Flagtown, Revere, Belle Mead, Ottsville and
Sergeantsville.

This includes Interstate 78 in New Jersey between mile markers 7 and
27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4040 7481 4040 7501 4043 7512 4052 7529
      4060 7519 4059 7518 4063 7515 4070 7502
      4069 7500 4075 7494 4081 7481 4048 7460
      4042 7476 4042 7480
TIME...MOT...LOC 1813Z 231DEG 21KT 4058 7499 

HAIL...1.00IN
WIND...60MPH
 
$$

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 11:06 PM EDTTropical Storm WarningPHIAtlantic, Burlington, Cape May, Monmouth, Ocean32 hr
Jul 7, 11:37 PM EDTSpecial Weather StatementPHISussex38 min
Jul 8, 5:27 AM EDTSmall Craft AdvisoryPHI34 hr
Jul 8, 2:09 PM EDTSpecial Marine WarningPHI81 min
Jul 8, 2:26 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean21 min
Jul 8, 2:29 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Warren46 min
Jul 8, 2:43 PM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean27 hr
Jul 8, 3:03 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset42 min
Jul 8, 4:02 PM EDTSpecial Marine WarningPHI33 min
Jul 8, 4:02 PM EDTSevere Thunderstorm WarningPHIMonmouth31 min
Jul 8, 4:43 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Somerset16 min
Jul 8, 5:29 PM EDTSpecial Weather StatementPHIMorris, Warren46 min
Jul 8, 5:34 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Sussex, Warren41 min
Jul 8, 6:06 PM EDTSevere Thunderstorm WarningPHIHunterdon39 min
Jul 8, 6:09 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex51 min
Jul 8, 6:16 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Sussex, Warren44 min
Jul 7, 11:11 PM EDTSpecial Weather StatementPHIMonroe49 min
Jul 8, 8:53 AM EDTSpecial Weather StatementPHIMonroe52 min
Jul 8, 9:31 AM EDTAreal Flood AdvisoryPHICarbon, Monroe119 min
Jul 8, 9:46 AM EDTSpecial Weather StatementPHIMonroe44 min
Jul 8, 3:50 PM EDTSpecial Weather StatementPHIBerks25 min
Jul 8, 4:06 PM EDTSevere Thunderstorm WarningPHIBerks, Montgomery39 min
Jul 8, 4:25 PM EDTSevere Thunderstorm WarningPHIBerks50 min
Jul 8, 4:45 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery, Northampton45 min
Jul 8, 4:51 PM EDTSevere Thunderstorm WarningPHIBerks54 min
Jul 8, 5:11 PM EDTSpecial Weather StatementPHILehigh34 min
Jul 8, 5:21 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia39 min
Jul 8, 5:52 PM EDTSpecial Weather StatementPHIBerks23 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning in 2021

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.