Alert archive / Pennsylvania / Special Weather Statements in 2021
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Feb 18, 2021, 8:24 AM EST for Mercer County, Middlesex County, Monmouth County, New Jersey; 5 counties in Pennsylvania. It was in force for 66 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
- Feb 18, 2021, 8:24 AM EST (13:24 UTC)
- Expired
- Feb 18, 2021, 9:30 AM EST
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
Counties Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 13:23 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, 1.4 hours before the alert went out and 195 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
- 1468 m above ground
- 0-6 km bulk shear
- 82 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 406 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
868
WWUS81 KPHI 181324
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
824 AM EST Thu Feb 18 2021
DEZ001-NJZ009-010-012>020-026-PAZ060-070-071-101>106-181430-
New Castle-Salem-Camden-Coastal Ocean-Mercer-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-
824 AM EST Thu Feb 18 2021
...AN AREA OF HEAVY SNOW WILL AFFECT NORTHERN NEW CASTLE...NORTHERN
OCEAN...NORTHWESTERN CAMDEN...MERCER...SOUTHERN SOMERSET...
NORTHWESTERN SALEM...SOUTHEASTERN HUNTERDON...NORTHWESTERN
GLOUCESTER...NORTHERN BURLINGTON...MONMOUTH...MIDDLESEX...
MONTGOMERY...SOUTHEASTERN BERKS...SOUTHERN BUCKS...CHESTER...
PHILADELPHIA AND DELAWARE COUNTIES...
At 823 AM EST, an area of heavy snow was located along a line
extending from near Coatesville to near Greenwich.
Snowfall rates of around an inch per hour will be common within this
band. Given temperatures in the 20s and the cold ground, road
conditions will rapidly deteriorate. In addition, the visibility
will be reduced to one quarter of a mile within the heavy snow.
Be prepared for snow covered roads. Slow down and allow extra time
when traveling.
Locations impacted include...
Philadelphia, Toms River, Trenton, Camden, Wilmington, New Brunswick,
Perth Amboy, Newark, Long Branch, West Chester, Asbury Park,
Gloucester City, Sandy Hook, Somerset, Lakewood, Cherry Hill,
Middletown, Old Bridge, Bensalem and Jackson.
This includes the following highways...
New Jersey Turnpike between exits 4 and 11.
Pennsylvania Turnpike between mile markers 297 and 359.
Northeast Extension between mile markers 21 and 36.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 95 in Delaware between mile markers 6 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 195 in New Jersey between mile markers 0 and 34.
Interstate 295 in New Jersey between mile markers 0 and 20, and
between mile markers 23 and 76.
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 near mile marker 1.
Garden State Parkway between mile markers 83 and 128.
Visibilities will drop quickly to less than a quarter of a mile in
this area of heavy snow.
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 3999 7399 3985 7518 3965 7553 3968 7579
3972 7579 3972 7613 3987 7599 4011 7594
4014 7588 4017 7591 4026 7571 4040 7509
4050 7486 4053 7425 4050 7428 4044 7420
4041 7398 4048 7402 4048 7401 4043 7397
TIME...MOT...LOC 1323Z 242DEG 48KT 4001 7578 3932 7532
$$
BAHThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 18, 5:46 AM EST | Special Weather Statement | PHI | Mercer | 89 min |
| Feb 18, 5:58 AM EST | Special Weather Statement | PHI | Monmouth | 77 min |
| Feb 18, 7:24 AM EST | Special Weather Statement | PHI | Mercer, Middlesex, Monmouth | 51 min |
| Feb 18, 10:43 AM EST | Special Weather Statement | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 62 min |
| Feb 18, 12:06 PM EST | Special Weather Statement | PHI | Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more | 54 min |
Nearby
Special Weather Statements in Pennsylvania, 2021Special Weather Statements in New Jersey, 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.