Alert archive / New Jersey / Winter Storm Watches in 2017

Winter Storm Watch 3, NWS Philadelphia/Mount Holly

February 7, 20174 states

NWS Philadelphia/Mount Holly issued this winter storm watch at Feb 7, 2017, 3:29 PM EST for 4 states. It took effect at Feb 8, 2017, 10:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued
Feb 7, 2017, 3:29 PM EST (20:29 UTC)
In effect from
Feb 8, 2017, 10:00 PM EST
Expired
Feb 8, 2017, 4:01 AM EST
In force
Issued by
NWS Philadelphia/Mount Holly
All 25 counties

New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 20:31 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.5 hours before the alert went out and 124 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2017-02-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2017-02-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1608 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
267 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

107 
WWUS41 KPHI 072029
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
329 PM EST Tue Feb 7 2017

NJZ001-007>010-012-013-015-PAZ054-055-060>062-101>106-080830-
/O.NEW.KPHI.WS.A.0003.170209T0300Z-170209T2300Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Mercer-Carbon-Monroe-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
329 PM EST Tue Feb 7 2017

...WINTER STORM WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH
THURSDAY AFTERNOON...

The National Weather Service in Mount Holly has issued a Winter
Storm Watch...which is in effect from Wednesday evening through
Thursday afternoon.

* LOCATIONS...Eastern Pennsylvania and central and northern New
  Jersey. 

* HAZARD TYPES...Heavy snow.

* SNOW ACCUMULATIONS...Potential for 6 or more inches.

* TIMING...A wintry mix will overspread the area from the west
  Wednesday night. The event will likely begin as snow north of
  the I-78 corridor. Elsewhere, rain will change over to snow from
  northwest to southeast late Wednesday night into Thursday
  morning. Sleet may mix briefly during the transition from rain
  to snow. The snow could be heavy at times late Wednesday night
  and Thursday morning before tapering off from west to east
  during the afternoon Thursday.

* IMPACTS...The heavy snow and poor visibilities at times could
  make travel dangerous. Significant impacts to the Thursday
  morning rush are likely.

* WINDS...North 10 to 20 mph with gusts up to 30 mph.

* TEMPERATURES...Upper 30s and lower 40s at the onset, falling
  into the lower 30s by early Thursday morning.

* VISIBILITIES...1/2 mile or less at times in heavy snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow accumulations that may impact travel. Continue to monitor 
the latest forecasts.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$
jrk
2 follow-up statements
678 
WWUS41 KPHI 080228
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
928 PM EST Tue Feb 7 2017

DEZ001-MDZ008-NJZ014-016>020-026-027-PAZ070-071-081430-
/O.EXB.KPHI.WS.A.0003.170209T0900Z-170209T2300Z/
New Castle-Cecil-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Coastal Ocean-
Southeastern Burlington-Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Sandy Hook, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Jackson, Long Beach Island, Wharton State Forest, 
Media, and Philadelphia
928 PM EST Tue Feb 7 2017

...WINTER STORM WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY AFTERNOON...

The National Weather Service in Mount Holly has issued a Winter
Storm Watch...which is in effect from late Wednesday night
through Thursday afternoon.

* LOCATIONS...Northeastern Maryland, northern Delaware,
  southeastern Pennsylvania and southern New Jersey.

* HAZARD TYPES...Heavy snow.

* SNOW ACCUMULATIONS...Potential for 5 or more inches.

* TIMING...Rain will overspread the area from the west Wednesday
  night and changeover to snow from northwest to southeast early
  Thursday morning. Sleet may mix in briefly during the transition
  from rain to snow. The snow could be heavy at times Thursday
  morning before quickly tapering off from west to east during 
  the afternoon.

* IMPACTS...The heavy snow and poor visibilities at times could
  make travel dangerous. Significant impacts to the Thursday
  morning rush are possible.

* WINDS...North 10 to 20 mph with gusts up to 30 mph.

* TEMPERATURES...Lower 40s at the onset, falling into the mid 30s
  early Thursday morning.

* VISIBILITIES...1/2 mile or less at times in heavy snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow accumulations that may impact travel. Continue to monitor
the latest forecasts.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$

NJZ001-007>010-012-013-015-PAZ054-055-060>062-101>106-081430-
/O.CON.KPHI.WS.A.0003.170209T0300Z-170209T2300Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Mercer-Carbon-Monroe-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
928 PM EST Tue Feb 7 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY EVENING
THROUGH THURSDAY AFTERNOON...

* LOCATIONS...Eastern Pennsylvania and central and northern New 
  Jersey.

* HAZARD TYPES...Heavy snow.

* SNOW ACCUMULATIONS...Potential for 6 or more inches.

* TIMING...A wintry mix will overspread the area from the west
  Wednesday night. The event will likely begin as snow north of
  the I-78 corridor. Elsewhere, rain will change over to snow from
  northwest to southeast late Wednesday night into early Thursday
  morning. Sleet may mix in briefly during the transition from
  rain to snow. The snow could be heavy at times late Wednesday
  night and Thursday morning before tapering off quickly from west
  to east during the afternoon.

* IMPACTS...The heavy snow and poor visibilities at times could 
  make travel dangerous. Significant impacts to the Thursday 
  morning rush are likely.

* WINDS...North 10 to 20 mph with gusts up to 30 mph.

* TEMPERATURES...Upper 30s and lower 40s at the onset, falling 
  into the upper 20s and lower 30s by early Thursday morning.

* VISIBILITIES...1/2 mile or less at times in heavy snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow accumulations that may impact travel. Continue to monitor
the latest forecasts.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$
JRK
774 
WWUS41 KPHI 080901
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
401 AM EST Wed Feb 8 2017


NJZ001-007>010-012-013-015-PAZ054-055-060>062-101>106-082115-
/O.UPG.KPHI.WS.A.0003.170209T0300Z-170209T2300Z/
/O.NEW.KPHI.WS.W.0002.170209T0500Z-170209T2100Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Mercer-Carbon-Monroe-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville,
and Doylestown
401 AM EST Wed Feb 8 2017

...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 4 PM
EST THURSDAY...

The National Weather Service in Mount Holly has issued a Winter
Storm Warning for snow...which is in effect from midnight tonight
to 4 PM EST Thursday. The Winter Storm Watch is no longer in 
effect.

* ACCUMULATIONS...Snow accumulation of 6 to 10 inches.

* LOCATIONS...Eastern Pennsylvania and central and northern New 
  Jersey.

* HAZARD TYPES...Heavy snow.

* VISIBILITIES...One quarter mile or less at times.. 

* TIMING...A wintry mix will overspread the area from the west
  near midnight reaching the northern New Jersey coast by 4 am.
  The event will likely begin as snow north of the I-78 corridor.
  Elsewhere, rain will change over to snow from northwest to
  southeast into early Thursday morning. Sleet may mix in briefly
  during the transition from rain to snow. The snow likely will
  be heavy for a time Thursday morning before tapering off
  quickly from west to east during midday or the afternoon.

* IMPACTS...The heavy snow will make many roads potentially
  impassable for several hours during the worst part of the storm
  which should be 5 am to 10 am. There may be widespread power
  outages due to the weight of the snow on tree limbs and power
  lines. The threat for power outages will be less where
  temperatures are mostly below 30 degrees during the snow.  

* WINDS...North 10 to 20 mph with gusts up to 30 mph.

* TEMPERATURES...falling into the 20s over most of this area
  during the snow before a slight recovery in the afternoon.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for heavy snow means severe winter weather
conditions are expected or occurring.  Significant amounts of
snow are forecast that will make travel dangerous. Only travel in
an emergency. If you must travel...keep an extra flashlight...
food...and water in your vehicle in case of an emergency.

Report snow and ice accumulation to the National Weather Service
by calling our trained spotter line...posting to the NWS Mount
Holly Facebook page...or using Twitter.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$

DEZ001-MDZ008-NJZ014-016>020-026-027-PAZ070-071-082115-
/O.UPG.KPHI.WS.A.0003.170209T0900Z-170209T2300Z/
/O.NEW.KPHI.WS.W.0002.170209T0900Z-170209T2100Z/
New Castle-Cecil-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Coastal Ocean-
Southeastern Burlington-Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Sandy Hook, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Jackson, Long Beach Island, Wharton State Forest, 
Media, and Philadelphia
401 AM EST Wed Feb 8 2017

...WINTER STORM WARNING IN EFFECT FROM 4 AM TO 4 PM EST
THURSDAY...

The National Weather Service in Mount Holly has issued a Winter
Storm Warning for snow...which is in effect from 4 AM to 4 PM EST
Thursday. The Winter Storm Watch is no longer in effect.

* LOCATIONS...Northeastern Maryland, northern Delaware, 
  southeastern Pennsylvania and southern New Jersey.

* ACCUMULATIONS...Snow accumulation of 4 to 6 inches.

* HAZARD TYPES...Heavy snow.

* VISIBILITIES...One quarter mile or less at times.

* TIMING...Rain will overspread the area between midnight and 3 AM
  Thursday and change to sleet and then snow from northwest to
  southeast by dawn Thursday. The snow should be heavy at times
  Thursday morning before quickly tapering off from west to east
  during midday or the afternoon.

* IMPACTS...The heavy snow will make many roads briefly
  impassable and may produce widespread power outages due to the
  weight of the snow on tree limbs and power lines. 

* WINDS...North 15 to 25 mph with gusts up to 35 mph.

* TEMPERATURES...Falling into the upper 20s to around 30 during
  the snow then a slight afternoon recovery. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for heavy snow means severe winter weather
conditions are expected or occurring.  Significant amounts of
snow are forecast that will make travel dangerous. Only travel in
an emergency. If you must travel...keep an extra flashlight...
food...and water in your vehicle in case of an emergency.

Report snow and ice accumulation to the National Weather Service 
by calling our trained spotter line...posting to the NWS Mount 
Holly Facebook page...or using Twitter.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$

DEZ002-MDZ012-015-NJZ021>025-082115-
/O.NEW.KPHI.WW.Y.0007.170209T1300Z-170209T1900Z/
Kent-Kent MD-Queen Annes-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-
Including the cities of Dover, Chestertown, Centreville, 
Millville, Hammonton, Cape May Court House, Ocean City, 
and Atlantic City
401 AM EST Wed Feb 8 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 AM TO 2 PM EST
THURSDAY...

The National Weather Service in Mount Holly has issued a Winter
Weather Advisory for snow...which is in effect from 8 AM to 2 PM 
EST Thursday.

* LOCATIONS...a portion of northeast Maryland through central
  Delaware into the southern tip of New Jersey.

* HAZARD TYPES...snow and possibly a period of sleet.

* ACCUMULATIONS...Snow accumulation of 1 to 4 inches.

* VISIBILITIES...One quarter mile or less at times during the
  morning.

* TIMING...heaviest snow should fall sometime between 8 am and
  Noon.

* IMPACTS...The snow will create snow covered roads and possibly
  produce isolated power outages. Gusty winds may lead to blowing
  snow and reduced visibility. 

* WINDS...North 20 to 25 mph with gusts up to 40 mph becoming
  northwest by Noon. 

* TEMPERATURES...falling to near 30 during the snow then
  recovering slightly during the afternoon. 


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means that periods of snow 
will cause primarily travel difficulties. Be prepared for snow 
covered roads and limited visibilities...and use caution while 
driving.

Report Snow and ice accumulation to the National Weather Service
by calling our trained spotter line...posting to the NWS Mount
Holly Facebook page...or using Twitter.

Snowfall and ice accumulation forecast maps in addition to
experimental probabilistic snowfall information for the latest
event are available online at www.weather.gov/phi/winter

&&

$$
Drag

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 7, 3:34 PM ESTGale WatchPHI11 hr

Nearby

Winter Storm Watches in New Jersey, 2017Winter Storm Watches in Pennsylvania, 2017Winter Storm Watches in Maryland, 2017Every winter storm watch in 2017

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.