Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly

May 31, 2017Hunterdon County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 31, 2017, 8:04 PM EDT for Hunterdon County, Somerset County, New Jersey. It was in force for 36 min. 13 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: May 31, 2017, 8:04 PM EDT (00:04 UTC)
Expired: May 31, 2017, 8:40 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 00:05 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
May 31, 8:10 PM EDT	HAIL 0.75	Delaware Twp, NJ	SM WITH IMAGERY.
May 31, 8:10 PM EDT	HAIL 0.75	Delaware Twp, NJ	SOCIAL MEDIA WITH IMAGERY.
May 31, 8:15 PM EDT	HAIL 1	1 Ssw Cherryville, NJ	ALONG THE BORDER OF PITTSTOWN AND RARITAN TOWNSHIP. TIME ESTIMATED FROM RADAR.
May 31, 8:15 PM EDT	HAIL 1	Raritan, NJ	TIME EST.
May 31, 8:17 PM EDT	HAIL 1	2 Ese Croton, NJ	QUARTER SIZE HAIL AT THE HUNTERDON COUNTY LIBRARY IN RARITAN TOWNSHIP.
May 31, 8:18 PM EDT	HAIL 1	Flemington, NJ	FACEBOOK PICTURE. TIME ESTIMATED FROM RADAR.
May 31, 8:18 PM EDT	HAIL 1	Flemington, NJ	FB IMAGERY. TIME EST.
May 31, 8:25 PM EDT	HAIL 0.75	Readington Twp, NJ
May 31, 8:29 PM EDT	HAIL 0.75	Readington Twp, NJ	WHITE HOUSE STATION
May 31, 8:29 PM EDT	HAIL 0.75	Whitehouse Station, NJ
May 31, 8:35 PM EDT	HAIL 0.88	Branchburg, NJ
May 31, 8:35 PM EDT	HAIL 1	Branchburg, NJ	ALSO NICKEL .88 SAME TIME FROM NEARBY IN BRANCHBURG.
May 31, 8:35 PM EDT	HAIL 1	Branchburg, NJ

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, 0.1 hours before the alert went out and 175 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1161 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

352 
WUUS51 KPHI 010004
SVRPHI
NJC019-035-010100-
/O.NEW.KPHI.SV.W.0035.170601T0004Z-170601T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
804 PM EDT WED MAY 31 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Southwestern Somerset County in northern New Jersey...

* Until 900 PM EDT

* At 803 PM EDT, a severe thunderstorm was located over Flemington,
  or 15 miles west of Somerville, moving northeast at 40 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Manville, Flemington, Millstone, Cloverhill, Flagtown, Belle Mead,
  Sergeantsville, White House Station, Sand Brook and Raritan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

&&

LAT...LON 4041 7504 4050 7506 4067 7472 4045 7454
TIME...MOT...LOC 0003Z 245DEG 33KT 4051 7490 

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

Gorse

2 follow-up statements

084 
WWUS51 KPHI 010019
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
819 PM EDT WED MAY 31 2017

NJC019-035-010100-
/O.CON.KPHI.SV.W.0035.000000T0000Z-170601T0100Z/
Hunterdon NJ-Somerset NJ-
819 PM EDT WED MAY 31 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR EAST CENTRAL HUNTERDON AND SOUTHWESTERN SOMERSET COUNTIES...

At 819 PM EDT, a severe thunderstorm was located near Cloverhill, or
9 miles west of Somerville, moving northeast at 30 mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect damage to 
         trees and power lines. 

Locations impacted include...
Manville, Flemington, Millstone, Cloverhill, Flagtown, Belle Mead,
White House Station and Raritan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

&&

LAT...LON 4045 7487 4055 7496 4067 7472 4045 7454
TIME...MOT...LOC 0019Z 244DEG 28KT 4055 7479 

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

Gorse

034 
WWUS51 KPHI 010040
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
840 PM EDT WED MAY 31 2017

NJC019-035-010050-
/O.CAN.KPHI.SV.W.0035.000000T0000Z-170601T0100Z/
Hunterdon NJ-Somerset NJ-
840 PM EDT WED MAY 31 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL HUNTERDON AND
SOUTHWESTERN SOMERSET COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe 
limits and is moving out of the area, and no longer poses an 
immediate threat to life or property. Therefore the warning has been 
cancelled.

LAT...LON 4045 7487 4055 7496 4067 7472 4045 7454
TIME...MOT...LOC 0038Z 245DEG 33KT 4063 7456 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:39 PM EDT	Special Weather Statement	PHI	Somerset	36 min
May 31, 10:41 PM EDT	Special Weather Statement	PHI	Sussex	34 min
May 31, 11:13 PM EDT	Special Weather Statement	PHI	Sussex, Warren	32 min
May 31, 11:42 PM EDT	Special Weather Statement	PHI	Sussex	33 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017 Every severe thunderstorm warning in 2017

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.