Alert archive / New Jersey / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

April 28, 20185 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 28, 2018, 6:21 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 24 min. 6 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: Apr 28, 2018, 6:21 PM EDT (22:21 UTC)
Expired: Apr 28, 2018, 6:45 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly

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

The radar

The Philadelphia radar (KDIX), 99 km from the middle of the area, began a volume at 22:22 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
Apr 28, 6:25 PM EDT	HAIL 0.25	Jefferson Twp, NJ
Apr 28, 6:33 PM EDT	HAIL 0.25	Mount Arlington, NJ	VIDEO OF PEA-SIZED HAIL IN MOUNT ARLINGTON.
Apr 28, 6:39 PM EDT	HAIL 0.25	Lake Hopatcong, NJ
Apr 28, 6:45 PM EDT	HAIL 0.25	Randolph Twp, NJ
Apr 28, 6:55 PM EDT	HAIL 0.25	1 Se Buckingham Valley, PA	PEA-SIZED HAIL WITH 5-MINUTE DURATION IN BUCKINGHAM TWP.
Apr 28, 6:55 PM EDT	HAIL 0.5	Morristown, NJ	VIDEO OF HAIL BETWEEN PEA AND DIME SIZED IN MORRISTOWN.

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, 10.4 hours before the alert went out and 139 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: 898 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

751 
WWUS81 KPHI 282221
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
621 PM EDT SAT APR 28 2018

NJZ001-007>010-012-015-PAZ104>106-282245-
Morris-Hunterdon-Sussex-Somerset-Middlesex-Warren-Mercer-Lower
Bucks-Upper Bucks-Eastern Montgomery-
621 PM EDT SAT APR 28 2018

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT MORRIS...HUNTERDON...
SUSSEX...EASTERN WARREN...MERCER...SOMERSET...NORTHWESTERN
MIDDLESEX...EAST CENTRAL MONTGOMERY AND CENTRAL BUCKS COUNTIES...

At 619 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Sussex to Robesonia. Movement was
northeast at 35 mph.

Pea size hail are possible with these storms. A gust front several 
miles ahead of the thunderstorms could bring wind gusts up to 40 mph 
before the rain even begins.

Locations impacted include...
Trenton, Morristown, Somerville, Newton, Somerset, Bridgewater,
Ewing, Dover, Lansdale, Madison, Hopatcong, Middlesex, East Norriton,
Princeton, Florham Park, East Hanover, Lincoln Park, Bound Brook,
Manville and Kinnelon.

LAT...LON 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4095 7427 4091 7430
      4091 7433 4086 7432 4071 7440 4067 7446
      4066 7443 4017 7468 4019 7470 4014 7473
      4013 7533 4134 7472 4135 7468
TIME...MOT...LOC 2219Z 241DEG 32KT 4124 7463 4035 7515 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:44 AM EDT	Small Craft Advisory	PHI		24 hr
Apr 28, 5:16 AM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Hunterdon, Mercer and 3 more	4 hr
Apr 28, 5:15 PM EDT	Special Weather Statement	PHI	Warren	30 min
Apr 28, 6:06 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	24 min
Apr 28, 6:37 PM EDT	Special Marine Warning	PHI		53 min
Apr 28, 6:45 PM EDT	Special Weather Statement	PHI	Middlesex, Morris, Somerset	30 min
Apr 28, 7:20 PM EDT	Special Marine Warning	PHI		55 min
Apr 28, 4:08 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	37 min
Apr 28, 4:40 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	50 min
Apr 28, 5:22 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	23 min
Apr 28, 5:52 PM EDT	Special Weather Statement	PHI	Montgomery	23 min
Apr 28, 6:09 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Delaware, Montgomery	36 min
Apr 28, 6:26 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Philadelphia	49 min

Nearby

Special Weather Statements in New Jersey, 2018 Special Weather Statements in Pennsylvania, 2018 Every special weather statement in 2018

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.