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 Jan 20, 2021, 9:52 AM EST for Hunterdon County, Somerset County, Warren County, New Jersey; 5 counties in Pennsylvania. It was in force for 53 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, 9:52 AM EST (14:52 UTC)
- Expired
- Jan 20, 2021, 10:45 AM EST
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 99 km from the middle of the area, began a volume at 14:55 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, 2.9 hours before the alert went out and 206 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.
313
WWUS81 KPHI 201452
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
952 AM EST Wed Jan 20 2021
NJZ001-007>010-012-015-PAZ055-060>062-101-103>106-201545-
Mercer-Morris-Hunterdon-Sussex-Somerset-Middlesex-Warren-Lower
Bucks-Lehigh-Eastern Montgomery-Western Chester-Northampton-Upper
Bucks-Monroe-Western Montgomery-Berks-
952 AM EST Wed Jan 20 2021
...A SNOW SQUALL WILL AFFECT WARREN...NORTHWESTERN MERCER...
SOMERSET...SOUTHWESTERN MORRIS...HUNTERDON...SOUTHWESTERN SUSSEX...
NORTH CENTRAL MIDDLESEX...NORTHERN MONTGOMERY...SOUTHEASTERN
MONROE...BERKS...LEHIGH...BUCKS...NORTHEASTERN CHESTER AND
NORTHAMPTON COUNTIES...
At 950 AM EST, a snow squall was located along a line extending from
Delaware Water Gap to near Jordan Valley to near Fort Indiantown Gap.
Movement was southeast at 35 mph. Visibilities could briefly drop
under a half mile and a coating of snow of roadways.
Locations impacted include...
Allentown, Reading, Easton, Somerville, Somerset, Bethlehem,
Bridgewater, Pottstown, Phoenixville, Lansdale, Forks, Middlesex,
Emmaus, Wyomissing, Bound Brook, Manville, Northampton, East
Stroudsburg, Hackettstown and Quakertown.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 308.
Northeast Extension between mile markers 26 and 69.
Interstate 78 in Pennsylvania near mile marker 8, and between mile
markers 10 and 76.
Interstate 78 in New Jersey between mile markers 0 and 41.
Interstate 80 in Pennsylvania between mile markers 310 and 314.
Interstate 80 in New Jersey between mile markers 0 and 28.
Interstate 287 in New Jersey between mile markers 4 and 32.
Interstate 176 in Pennsylvania between mile markers 1 and 11.
Garden State Parkway near mile marker 133.
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 4057 7602 4065 7598 4081 7548 4084 7549
4112 7494 4069 7444 4066 7445 4065 7440
4060 7446 4061 7435 4058 7432 4027 7501
4003 7594 4011 7594 4014 7588 4049 7643
TIME...MOT...LOC 1450Z 311DEG 29KT 4096 7515 4073 7567 4048 7664
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 10:42 AM EST | Special Weather Statement | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset | 63 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 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.