Alert archive / New Jersey / Special Weather Statements in 2021
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Jan 20, 2021, 10:42 AM EST for 6 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 63 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
- Jan 20, 2021, 10:42 AM EST (15:42 UTC)
- Expired
- Jan 20, 2021, 11:45 AM EST
- In force
- 63 min
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 15:42 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 3.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1247 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
294
WWUS81 KPHI 201542
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
1042 AM EST Wed Jan 20 2021
DEZ001-NJZ008>010-012>020-PAZ060-070-071-101>106-201645-
New Castle-Salem-Camden-Mercer-Morris-Hunterdon-Northwestern
Burlington-Eastern Monmouth-Ocean-Western
Monmouth-Somerset-Middlesex-Gloucester-Lower Bucks-Eastern
Montgomery-Western Chester-Philadelphia-Upper Bucks-Western
Montgomery-Delaware-Eastern Chester-Berks-
1042 AM EST Wed Jan 20 2021
...A SNOW SQUALL WILL AFFECT NORTHEASTERN NEW CASTLE...NORTHWESTERN
OCEAN...NORTHWESTERN CAMDEN...MERCER...SOMERSET...NORTHWESTERN
SALEM...MORRIS...HUNTERDON...NORTHWESTERN GLOUCESTER...NORTHWESTERN
BURLINGTON...MONMOUTH...MIDDLESEX...MONTGOMERY...SOUTHEASTERN
BERKS...BUCKS...NORTHEASTERN CHESTER...PHILADELPHIA AND DELAWARE
COUNTIES...
At 1039 AM EST, a snow squall was located along a line extending from
near Kinnelon to near Clinton to near Perkasie to near Adamstown.
Movement was southeast at 35 mph. This squall has the potential to
briefly drop visibilities below one half mile and result in a light
coating of snow on roadways.
Locations impacted include...
Philadelphia, Trenton, Camden, New Brunswick, Perth Amboy, West
Chester, Morristown, Somerville, Gloucester City, Sandy Hook,
Somerset, Edison, Cherry Hill, Middletown, Old Bridge, Bensalem, East
Brunswick, Bridgewater, South Brunswick and Sayreville.
This includes the following highways...
New Jersey Turnpike between exits 3 and 13.
Pennsylvania Turnpike between mile markers 295 and 359.
Northeast Extension between mile markers 21 and 41.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 95 in Delaware between mile markers 19 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 78 in New Jersey between mile markers 17 and 42.
Interstate 80 in New Jersey between mile markers 32 and 46.
Interstate 195 in New Jersey between mile markers 0 and 23.
Interstate 295 in New Jersey between mile markers 9 and 30, and
between mile markers 33 and 76.
Interstate 287 in New Jersey between mile markers 0 and 54.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 19.
Interstate 176 in Pennsylvania between mile markers 1 and 9.
Garden State Parkway between mile markers 107 and 134.
Use extra caution if you must travel into or through this dangerous
snow squall. Rapid changes in visibility and potentially slick roads
are likely to lead to accidents. Consider delaying travel until the
squall passes your location.
Conditions can deteriorate rapidly in winter weather situations. Be
prepared for snow or ice covered roads. Slow down and allow extra
time when traveling.
LAT...LON 4025 7412 4007 7447 3973 7543 4025 7604
4043 7530 4060 7495 4106 7445 4102 7443
4100 7430 4090 7427 4091 7434 4060 7446
4060 7421 4050 7428 4046 7425 4041 7403
4044 7399 4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 1539Z 298DEG 32KT 4103 7440 4058 7490 4041 7525 4024
7599
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 9:52 AM EST | Special Weather Statement | PHI | Hunterdon, Somerset, Warren | 53 min |
| Jan 20, 12:02 PM EST | Special Marine Warning | PHI | 58 min | |
| Jan 20, 1:00 PM EST | Special Marine Warning | PHI | 65 min | |
| Jan 20, 8:56 AM EST | Special Weather Statement | PHI | Carbon, Monroe | 49 min |
Nearby
Special Weather Statements in New Jersey, 2021Special Weather Statements in Pennsylvania, 2021Every 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.