Alert archive / New Jersey / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

May 31, 2017Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at May 31, 2017, 8:39 PM EDT for Somerset County, New Jersey. It was in force for 36 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: May 31, 2017, 8:39 PM EDT (00:39 UTC)
Expired: May 31, 2017, 9:15 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 00:42 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, 8:52 PM EDT	HAIL 0.75	Basking Ridge, NJ	TIME EST..
May 31, 8:52 PM EDT	HAIL 0.75	Basking Ridge, NJ	TIME ESTIMATED FROM RADAR.
May 31, 8:52 PM EDT	HAIL 0.75	Basking Ridge, 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, 0.7 hours before the alert went out and 136 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.

046 
WWUS81 KPHI 010039
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
839 PM EDT WED MAY 31 2017

NJZ008>010-012-010115-
Morris-Hunterdon-Somerset-Middlesex-
839 PM EDT WED MAY 31 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MORRIS...EASTERN
HUNTERDON...CENTRAL SOMERSET AND NORTH CENTRAL MIDDLESEX COUNTIES...

At 839 PM EDT, a strong thunderstorm was located over Bridgewater, or
over Somerville, moving east at 30 mph.

Winds up to 40 mph and dime size hail are possible with this storm.

Locations impacted include...
Somerville, Bridgewater, Madison, Middlesex, Florham Park, Bound
Brook, Manville, Chatham, Far Hills, Martinsville, Millington, White
House Station, Basking Ridge, North Plainfield, Dunellen, Raritan and
Watchung.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4074 7437 4067 7446 4066 7445 4066 7440
      4063 7442 4060 7446 4060 7440 4059 7443
      4053 7470 4061 7479 4079 7437 4076 7438
      4075 7436
TIME...MOT...LOC 0039Z 249DEG 27KT 4060 7464 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, 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

Special Weather Statements in New Jersey, 2017 Every special weather statement 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.