Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

April 21, 20214 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 21, 2021, 1:17 PM EDT for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 58 min. 5 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 21, 2021, 1:17 PM EDT (17:17 UTC)
Expired: Apr 21, 2021, 2:15 PM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly

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

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 17:18 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 21, 1:20 PM EDT	TSTM WND DMG	1 Wsw Clinton, NJ	DOWNED TREE ON I-78 EASTBOUND RAMP TO EXIT 15. ONE LANE WAS CLOSED. TIME ESTIMATED FROM RADAR.
Apr 21, 1:40 PM EDT	HAIL 0.25	Chester, NJ
Apr 21, 1:40 PM EDT	HAIL 0.25	Sparta, NJ
Apr 21, 1:48 PM EDT	TSTM WND DMG	3 N Branchburg Twp, NJ	UTILITY POLE DOWN ON US-22 EASTBOUND WEST OF READINGTON RD. ALL LANES WERE CLOSED. TIME ESTIMATED FROM RADAR.
Apr 21, 1:55 PM EDT	TSTM WND DMG	3 Sse Far Hills, NJ	A FEW MEDIUM SIZED TREE BRANCHES DOWN. TIME ESTIMATED FROM RADAR.

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, 5.3 hours before the alert went out and 145 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: 1427 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

782 
WWUS81 KPHI 211717
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
117 PM EDT Wed Apr 21 2021

NJZ001-007>010-015-PAZ105-106-211815-
Hunterdon-Morris-Sussex-Somerset-Warren-Mercer-Lower Bucks-Upper
Bucks-
117 PM EDT Wed Apr 21 2021

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

At 117 PM EDT, radar indicated strong thunderstorms were located
along a line extending from High Point to Great Meadows-Vienna to
near Doylestown. Movement was northeast at 30 mph.

Wind gusts up to 50 mph and penny size hail are possible with these
storms.

Locations impacted include...
Morristown, Somerville, Newton, Bridgewater, Dover, Hopatcong,
Manville, Hackettstown, Doylestown, Byram, Wharton, Washington,
Rockaway, Morris Plains, Mount Arlington, Franklin, Mendham,
Flemington, Mountain Lakes and Tinicum.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 8 and 36.
 Interstate 80 in New Jersey between mile markers 13 and 42.
 Interstate 287 in New Jersey between mile markers 15 and 33.

If outdoors, consider seeking shelter inside a building.

LAT...LON 4120 7436 4109 7450 4108 7449 4104 7450
      4105 7445 4102 7443 4103 7442 4101 7438
      4031 7470 4030 7521 4086 7499 4135 7468
      4135 7467
TIME...MOT...LOC 1717Z 246DEG 28KT 4134 7464 4089 7491 4033 7517 

$$

Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 8:48 PM EDT	Freeze Watch	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	7 hr
Apr 21, 3:26 AM EDT	Freeze Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	30 hr
Apr 21, 12:25 PM EDT	Severe Thunderstorm Warning	PHI	Warren	50 min
Apr 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	21 min
Apr 21, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	27 min
Apr 21, 1:10 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Salem	50 min
Apr 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	36 min
Apr 21, 1:30 PM EDT	Special Marine Warning	PHI		60 min
Apr 21, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	33 min
Apr 21, 1:58 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Monmouth, Ocean	62 min
Apr 21, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Monmouth, Ocean	43 min
Apr 21, 2:03 PM EDT	Special Weather Statement	PHI	Cumberland	27 min
Apr 21, 2:17 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	43 min
Apr 21, 2:28 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	47 min
Apr 21, 2:30 PM EDT	Special Marine Warning	PHI		60 min
Apr 21, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	37 min
Apr 21, 2:40 PM EDT	Special Marine Warning	PHI		55 min
Apr 21, 2:43 PM EDT	Special Weather Statement	PHI	Cape May	32 min
Apr 21, 2:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	40 min
Apr 21, 3:02 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	28 min
Apr 21, 3:07 PM EDT	Special Marine Warning	PHI		53 min
Apr 21, 12:03 PM EDT	Special Weather Statement	PHI	Chester, Lehigh	42 min
Apr 21, 12:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	43 min
Apr 21, 12:54 PM EDT	Special Weather Statement	PHI	Delaware	36 min
Apr 21, 1:23 PM EDT	Severe Thunderstorm Warning	PHI	Kent	37 min
Apr 21, 2:09 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Apr 21, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	42 min
Apr 21, 2:47 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	16 min
Apr 21, 12:50 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	40 min

Nearby

Special Weather Statements in New Jersey, 2021 Special Weather Statements in Pennsylvania, 2021 Every special weather statement 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.