Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

July 21, 2021Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 21, 2021, 11:09 AM EDT for Morris County, New Jersey. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2021, 11:09 AM EDT (15:09 UTC)
Expired: Jul 21, 2021, 11:45 AM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 96 km from the middle of the area, began a volume at 15:11 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.2 hours before the alert went out and 131 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: 130 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

918 
WWUS81 KPHI 211509
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
1109 AM EDT Wed Jul 21 2021

NJZ008-211545-
Morris-
1109 AM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MORRIS COUNTY...

At 1109 AM EDT, a strong thunderstorm was located over Mendham, or
near Morristown, moving east at 35 mph.

Wind gusts up to 40 mph are possible with this storm.

Locations impacted include...
Morristown, Dover, Madison, Florham Park, East Hanover, Lincoln Park,
Chatham, Boonton, Rockaway, Morris Plains, Mendham, Mountain Lakes,
Peapack And Gladstone, Chester, Victory Gardens, Succasunna,
Succasunna-Kenvil, Parsippany, Bernardsville and Hanover Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 39 and 48.
 Interstate 287 in New Jersey between mile markers 31 and 48.

LAT...LON 4090 7427 4091 7434 4083 7433 4076 7438
      4075 7436 4069 7444 4069 7452 4070 7451
      4076 7456 4073 7466 4085 7469 4095 7428
      4092 7429
TIME...MOT...LOC 1509Z 259DEG 32KT 4078 7457 

$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 12:41 PM EDT	Special Weather Statement	PHI	Ocean	34 min
Jul 21, 12:46 PM EDT	Special Marine Warning	PHI		89 min
Jul 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	39 min
Jul 21, 12:53 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	67 min
Jul 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	47 min
Jul 21, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	49 min
Jul 21, 2:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 21, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	47 min
Jul 21, 2:35 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	26 min
Jul 21, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Jul 21, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	44 min
Jul 21, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	33 min
Jul 21, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	47 min
Jul 21, 3:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	42 min
Jul 21, 3:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	33 min
Jul 21, 4:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 21, 4:17 PM EDT	Special Marine Warning	PHI		58 min
Jul 21, 4:50 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 5:07 PM EDT	Special Marine Warning	PHI		23 min
Jul 21, 5:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 21, 5:24 PM EDT	Special Marine Warning	PHI		46 min
Jul 21, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	29 min
Jul 21, 5:52 PM EDT	Special Marine Warning	PHI		53 min
Jul 21, 1:08 PM EDT	Special Weather Statement	PHI	Lehigh	37 min
Jul 21, 1:11 PM EDT	Special Weather Statement	PHI	Northampton	34 min
Jul 21, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jul 21, 2:03 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	42 min
Jul 21, 2:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery	19 min
Jul 21, 2:41 PM EDT	Special Weather Statement	PHI	Montgomery	49 min
Jul 21, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	42 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	38 min
Jul 21, 5:59 PM EDT	Special Weather Statement	PHI	Berks	31 min
Jul 21, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	25 min
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	26 min
Jul 21, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	44 min
Jul 21, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	30 min

Nearby

Special Weather Statements in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.