Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 177, NWS Philadelphia/Mount Holly

July 16, 2021Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 16, 2021, 5:29 PM EDT for Sussex County, New Jersey. It was in force for 46 min. 1 report 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: Jul 16, 2021, 5:29 PM EDT (21:29 UTC)
Expired: Jul 16, 2021, 6:15 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 144 km from the middle of the area, began a volume at 21:30 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

Time	Report	Where	Remark
Jul 16, 5:40 PM EDT	TSTM WND DMG	2 Wnw Vernon, NJ	MANY TREES REPORTED SNAPPED NEAR VERNON DUE TO WHAT WAS LIKELY A STRONG DOWNBURST. POWER OUTAGES ALSO REPORTED. TIME ESTIMATED FROM RADAR AND PUBLIC DAMAGE REPORT. THIS STORM EARLIER PRODUCED A 64 MPH WIND GUST.

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 12:00Z, 9.5 hours before the alert went out and 158 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: 1044 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 994 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

494 
WUUS51 KPHI 162129
SVRPHI
NJC037-162215-
/O.NEW.KPHI.SV.W.0177.210716T2129Z-210716T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
529 PM EDT Fri Jul 16 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Sussex County in northwestern New Jersey...

* Until 615 PM EDT.

* At 529 PM EDT, a severe thunderstorm was located over Sussex, or 10
  miles southeast of Montague, moving southeast at 15 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...
  Franklin, Hamburg, Ogdensburg, Sussex, Branchville, Pellettown,
  Highland Lake, Vernon Valley and Hainesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4131 7459 4120 7436 4103 7461 4120 7488
      4121 7486 4123 7487 4124 7486 4132 7461
TIME...MOT...LOC 2129Z 297DEG 14KT 4121 7463 

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

SFJ

2 follow-up statements

467 
WWUS51 KPHI 162144
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
544 PM EDT Fri Jul 16 2021

NJC037-162215-
/O.CON.KPHI.SV.W.0177.000000T0000Z-210716T2215Z/
Sussex NJ-
544 PM EDT Fri Jul 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHERN SUSSEX COUNTY...

At 544 PM EDT, a severe thunderstorm was located over Vernon Valley,
or 9 miles west of Warwick, moving east at 20 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Hamburg, Sussex, Branchville, Pellettown, Vernon Valley, Hainesville
and Highland Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4131 7459 4120 7436 4111 7474 4120 7488
      4121 7486 4123 7487 4124 7486 4132 7461
TIME...MOT...LOC 2144Z 260DEG 16KT 4122 7454 

HAIL...0.75IN
WIND...60MPH
 
$$

SFJ

358 
WWUS51 KPHI 162205
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
605 PM EDT Fri Jul 16 2021

NJC037-162215-
/O.EXP.KPHI.SV.W.0177.000000T0000Z-210716T2215Z/
Sussex NJ-
605 PM EDT Fri Jul 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX COUNTY WILL
EXPIRE AT 615 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4131 7459 4120 7436 4111 7474 4120 7488
      4121 7486 4123 7487 4124 7486 4132 7461
TIME...MOT...LOC 2205Z 252DEG 27KT 4122 7464 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 2:55 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 16, 3:17 PM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Gloucester, Hunterdon, Mercer and 8 more	35 hr
Jul 16, 5:01 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Jul 16, 5:21 PM EDT	Flash Flood Warning	PHI	Sussex	2 hr
Jul 16, 5:25 PM EDT	Special Weather Statement	PHI	Sussex	35 min
Jul 16, 5:34 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	112 min
Jul 16, 6:10 PM EDT	Special Weather Statement	PHI	Warren	35 min
Jul 16, 6:14 PM EDT	Special Weather Statement	PHI	Sussex	31 min
Jul 16, 6:27 PM EDT	Areal Flood Advisory	PHI	Sussex	59 min
Jul 16, 6:46 PM EDT	Special Weather Statement	PHI	Warren	29 min
Jul 16, 7:10 PM EDT	Special Weather Statement	PHI	Warren	35 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.