Alert archive / Pennsylvania / Winter Weather Advisories in 2020
Winter Weather Advisory 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter weather advisory at Feb 4, 2020, 2:54 PM EST for 6 counties in Pennsylvania; 5 counties in New Jersey. It took effect at Feb 5, 2020, 8:00 PM EST. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Feb 4, 2020, 2:54 PM EST (19:54 UTC)
- In effect from
- Feb 5, 2020, 8:00 PM EST
- Expired
- Feb 6, 2020, 10:00 AM EST
- In force
- 14 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 19:56 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, 7.9 hours before the alert went out and 194 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
- 1384 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
822 WWUS41 KPHI 041954 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 254 PM EST Tue Feb 4 2020 NJZ001-007-008-PAZ054-055-062-051100- /O.NEW.KPHI.WW.Y.0004.200206T0300Z-200206T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 254 PM EST Tue Feb 4 2020 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM WEDNESDAY TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations up to a quarter inch. * WHERE...In Carbon, Monroe, and Northampton Counties in Pennsylvania, and Sussex, Warren, and Morris Counties in New Jersey. * WHEN...From 10 PM Wednesday to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. Scattered power outages are possible due to the accumulating ice. * ADDITIONAL DETAILS...Freezing rain amount will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ009-010-PAZ061-105-051100- /O.NEW.KPHI.WW.Y.0004.200206T0300Z-200206T1500Z/ Hunterdon-Somerset-Lehigh-Upper Bucks- Including the cities of Flemington, Somerville, Allentown, Chalfont, and Perkasie 254 PM EST Tue Feb 4 2020 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM WEDNESDAY TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of up to one to two tenths of an inch. * WHERE...In New Jersey, Hunterdon and Somerset. In Pennsylvania, Lehigh and Upper Bucks. * WHEN...From 10 PM Wednesday to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. A few isolated power outages are possible as well. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Deal
7 follow-up statements
365 WWUS41 KPHI 050836 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 336 AM EST Wed Feb 5 2020 PAZ060-052100- /O.EXB.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Berks- Including the city of Reading 336 AM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...Berks. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ001-007-008-PAZ054-055-062-052100- /O.EXT.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 336 AM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of one tenth to two tenths of an inch. * WHERE...Portions of northern New Jersey and east central and northeast Pennsylvania. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain amounts will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ009-010-PAZ061-105-052100- /O.EXT.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Hunterdon-Somerset-Lehigh-Upper Bucks- Including the cities of Flemington, Somerville, Allentown, Chalfont, and Perkasie 336 AM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...In New Jersey, Hunterdon and Somerset. In Pennsylvania, Lehigh and Upper Bucks. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Johnson
504 WWUS41 KPHI 052004 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 304 PM EST Wed Feb 5 2020 NJZ001-007-008-PAZ054-055-062-061000- /O.CON.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 304 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of one tenth to two tenths of an inch. Locally higher amounts up to three tenths of an inch possible. * WHERE...Portions of northern New Jersey and east central and northeast Pennsylvania. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. Isolated to scattered power outages will be possible. * ADDITIONAL DETAILS...Freezing rain amounts will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ009-010-PAZ061-105-061000- /O.CON.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Hunterdon-Somerset-Lehigh-Upper Bucks- Including the cities of Flemington, Somerville, Allentown, Chalfont, and Perkasie 304 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...In New Jersey, Hunterdon and Somerset. In Pennsylvania, Lehigh and Upper Bucks. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. Isolated power outages will be possible. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ PAZ060-061000- /O.CON.KPHI.WW.Y.0004.200206T0100Z-200206T1500Z/ Berks- Including the city of Reading 304 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...Berks. * WHEN...From 8 PM this evening to 10 AM EST Thursday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Deal
749 WWUS41 KPHI 060135 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 835 PM EST Wed Feb 5 2020 NJZ001-007-008-PAZ054-055-062-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 835 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of one tenth to two tenths of an inch. Locally higher amounts up to three tenths of an inch possible. * WHERE...Portions of northern New Jersey and east central and northeast Pennsylvania. * WHEN...Until 10 AM EST Thursday. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. Isolated to scattered power outages will be possible. * ADDITIONAL DETAILS...Freezing rain amounts will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ NJZ009-010-PAZ061-105-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Hunterdon-Somerset-Lehigh-Upper Bucks- Including the cities of Flemington, Somerville, Allentown, Chalfont, and Perkasie 835 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...In New Jersey, Hunterdon and Somerset. In Pennsylvania, Lehigh and Upper Bucks. * WHEN...Until 10 AM EST Thursday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. Isolated power outages will be possible. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ PAZ060-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Berks- Including the city of Reading 835 PM EST Wed Feb 5 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THURSDAY... * WHAT...Freezing rain expected. Total ice accumulations of around one tenth of an inch. * WHERE...Berks County. * WHEN...Until 10 AM EST Thursday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for your state can be obtained by calling 5 1 1. && $$
608 WWUS41 KPHI 060838 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 338 AM EST Thu Feb 6 2020 NJZ009-010-PAZ105-060945- /O.CAN.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Hunterdon-Somerset-Upper Bucks- Including the cities of Flemington, Somerville, Chalfont, and Perkasie 338 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures across Upper Bucks County in Pennsylvania and Hunterdon and Somerset Counties in New Jersey are above freezing and should remain above freezing. Therefore, the threat for freezing rain has ended and the winter weather advisory has been cancelled. $$ NJZ001-007-008-PAZ054-055-062-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 338 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING... * WHAT...Freezing rain. Additional ice accumulations of around one tenth of an inch. * WHERE...Portions of northern New Jersey and east central and northeast Pennsylvania. * WHEN...Until 10 AM EST this morning. * IMPACTS...Difficult travel conditions are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain amounts will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ PAZ061-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Lehigh- Including the city of Allentown 338 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING... * WHAT...Freezing rain. Additional ice accumulations of a light glaze. * WHERE...Lehigh. * WHEN...Until 10 AM EST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ PAZ060-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Berks- Including the city of Reading 338 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING... * WHAT...Freezing rain. Additional ice accumulations of a light glaze. * WHERE...Berks. * WHEN...Until 10 AM EST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain is primarily expected along and north of the Interstate 78 corridor. South of the Interstate 78 corridor, freezing rain is less likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Johnson
442 WWUS41 KPHI 061125 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 625 AM EST Thu Feb 6 2020 NJZ007-008-PAZ060>062-061230- /O.CAN.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Warren-Morris-Berks-Lehigh-Northampton- Including the cities of Washington, Morristown, Reading, Allentown, Bethlehem, and Easton 625 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures across Berks, Lehigh, and Northampton Counties in Pennsylvania and Warren and Morris Counties in New Jersey are above freezing and should remain above freezing. Therefore, the threat for freezing rain has ended and the winter weather advisory has been cancelled. $$ NJZ001-PAZ054-055-061500- /O.CON.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 625 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING... * WHAT...Freezing rain. Additional ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 10 AM EST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Freezing rain amounts will likely be higher in elevations above 1000 feet however small amounts remain possible down to valley floors. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Johnson
009 WWUS41 KPHI 061500 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 1000 AM EST Thu Feb 6 2020 NJZ001-PAZ054-055-061600- /O.EXP.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 1000 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 10 AM EST THIS MORNING... While areas of patchy freezing drizzle may still be occur the risk for additional ice accumulation is no longer expected as temperatures warm this morning. $$ Deal
335 WWUS41 KPHI 061505 CCA WSWPHI URGENT - WINTER WEATHER MESSAGE...CORRECTED National Weather Service Mount Holly NJ 1005 AM EST Thu Feb 6 2020 NJZ001-PAZ054-055-061600- /O.COR.KPHI.WW.Y.0004.000000T0000Z-200206T1500Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 1005 AM EST Thu Feb 6 2020 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 10 AM EST THIS MORNING... While areas of patchy freezing drizzle may still be occuring, the risk for additional ice accumulation is no longer expected as temperatures warm this morning. $$ Deal
What forecasters said that day
The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this winter weather advisory went out at Feb 4, 6:44 AM EST, 8 hours 10 minutes earlier.
Area forecast discussion, Feb 4, 6:44 AM EST, 8 hours 10 minutes before
Area Forecast Discussion National Weather Service Mount Holly NJ 644 AM EST Tue Feb 4 2020 .SYNOPSIS... A weak area of low pressure will track just to our west and north today, pulling a cold front across the area tonight into early Wednesday. Another area of low pressure will track up the Ohio Valley to near the eastern Great Lakes Wednesday night and Thursday pulling a warm front northward. A stronger low moves up the cold front and tracks over our area Thursday night into Friday. High pressure briefly builds in for Saturday followed by a low that may develop near the Mid-Atlantic coast into Sunday, then a cold front may arrive later Monday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Today will be the first in a series of systems that will keep cloudy and at times wet weather in the region for the next several days. A mid level short wave trough will cross the region through the day today. There appears to be little in the way of upper level support (if anything, there is weak ridging from 500 mb and further up), so not expecting this round to be a soaker. Instead, this looks like a quick shot for rain showers mostly through the morning, and the precipitation should be all rain. One thing of note is that the expected low level jet early this morning arrived stronger and quicker than what most guidance was showing. That being said, I don't think this will have a significant impact for us as the low level jet has already started to weaken (based on the KDIX VAD wind profile). Despite the cloudy conditions, we should stay in the warm sector, so temperatures will remain well above normal (generally 15 to 20 degrees above normal highs for this time of year), with highs in the upper 40s for the southern Poconos and lower 60s for portions of northern Delmarva. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... Frontogenesis is expected to occur along the front which will remain just northwest of our region into early this evening. This will serve to tighten the temperature gradient across the front and bring additional chances for precipitation ahead of and with the front as it begins to sink south through our region overnight. With mostly zonal flow from about 700 mb and higher, the front is expected to be shallow and relatively slow moving (relative for most cold fronts in this region in February). Consequently, the front may not be completely south of the region/off shore until near sunrise on Wednesday. Precipitation should end soon after the front passes as we should see significant dry air advection behind the front. As for precipitation type with the front, still expect mostly rain with this front. However, there is a chance if the precipitation lingers long enough across the southern Poconos and Northwest NJ there could be a brief period of freezing rain late tonight before the precipitation comes to an end. For now, think this is unlikely given the strong dry air advection that is expected. However, given the shallow and slow moving nature of this front, there is likely to be a robust warm layer aloft, so if precipitation does hang on longer than expected, it is probably going to be a question of freezing rain or rain rather than snow or rain. Given the timing of the front, we could have a non-diurnal temperature trend on Wednesday, with the highs being reached early in the day. Calendar day high temperatures may even occur near or shortly after midnight. Through the day time on Wednesday, temperatures will likely be in the 30s and 40s across much of the region. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Summary...Unsettled with temperature swings due to the arrival of a few fronts and low pressure systems through late this week. A period of icing probable Wednesday night and Thursday morning for portions of eastern Pennsylvania and northwestern New Jersey. Synoptic Overview...A ridge centered southeast of Florida will give way to a deep trough marching eastward through late this week. This will drive several waves of surface low pressure northeastward along a frontal zone. While a trough remains in the East through the weekend, it is forecast to weaken quite a bit although a stronger short wave trough embedded within it may result in a quick surface low development emerging off the Mid-Atlantic coast during the second half of the weekend into the start of next week. For Wednesday night and Thursday...A messy forecast especially due to parts of the region getting a period of freezing rain/sleet before going over to rain. Otherwise, a few rounds of rain are expected. A deep trough is forecast to stretch across the central part of the country and gradually shift eastward. This will drive surface low pressure along a frontal zone in the Tennessee and Ohio valley's. Meanwhile, a front draped across the Mid-Atlantic will gradually work its way northward in response to increasing flow and warm air advection. However, surface high pressure to our north which delivered colder and drier low-level air southward into our region will give way. A wedge of colder air will take longer to scour out however across portions of the Poconos to northwestern New Jersey Thursday. Given the synoptic setup, weighted the forecast much closer to the NAM which shows a classic warm layer northward resulting in some sleet to freezing rain. While some snow cannot be ruled out at the onset up north, this looks like an ice to rain scenario. Therefore, lowered the snow amounts considerably and went with more icing. The main area of icing is near and north of I-78 but especially the I-80 corridor. Given the surface low track just to our west Thursday, the lingering low-level cold air will be dislodged allowing a change to just rain by early afternoon. There looks to be a shot of precipitation later Wednesday night and Thursday morning then possibly a lull for a time Thursday afternoon, followed by another surge in moisture Thursday night as the main surface low tracks nearby. Temperatures will be a challenge as initially the surface warm front may be slow to advance northward as precipitation arrives within the remaining wedge setup (lingering confluence as well). The warm front may take on some coastal front characteristics as warming edges into southern New Jersey before spreading northwestward. This may result in much warmer air getting into southern Delaware to southeastern New Jersey on Thursday. For Friday...The main upper-level trough arrives in the East and this drives strengthening low pressure from very near our area to start the day, then across southeastern New England during the day. The precipitation will be ending across the area as the storm pulls away, however it is possible that it ends as a little snow across the northwestern zones. Otherwise, cold air advection kicks in and with a tightening pressure gradient an increasing and gusty west to northwest wind will develop. Rainfall amounts into Friday look to be 1.0 to 2.5 inches as a strong southwesterly low-level jet provides added lift and a few surges in the precipitable water values reach 1.0 to 1.5 inches. For Saturday and Sunday...The trough weakens allowing surface high pressure to build across our area. However, a short wave trough embedded in the broader trough should induce surface low development as it crosses the Ohio Valley. This surface low is forecast to emerge off the Mid-Atlantic coast, however the flow looks progressive and therefore the storm should quickly shift east and away from the coast during Sunday. The air mass might be cold enough for some wintry precipitation on the northwest fringe of the precipitation shield, however the details on this system is less certain given the multiple waves occurring before this feature. Overall, did not make any significant changes during this time frame. For Monday...The flow aloft is forecast to turn more zonal in the wake of the weekend short wave trough. Sprawling high pressure should crest over the area during Monday before shifting offshore at night. A return flow sets up at night along with warm air advection, which may result in some showers developing at night. It is possible the influence of the offshore high pressure remains strong enough to keep our area dry through the night, as we await for the system well to our west to get closer. Temperatures still look to be above where they should be for this time of the year. && .AVIATION /12Z TUESDAY THROUGH SATURDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Today...Looking upstream, MVFR ceilings aren't as widespread as I was expecting. Therefore, with the 12Z TAFs, I trended much more optimistic, keeping most TAF sites with VFR ceilings or ceilings hovering right around the MVFR/VFR threshold for much of the day. It should be noted that some guidance (namely the NAM), does suggest that lower conditions will be possible, but I'm inclined to doubt that until I see it develop upstream. Rain showers are possible through the morning, which could lead to temporary visibility restrictions. Southwesterly winds less than 10 kt are expected through the day. Tonight...Ceilings are likely to remain in the MVFR category, though localized IFR conditions are possible especially with any areas of rain right along and ahead of the cold front. The cold front will bring an abrupt shift to northwesterly and eventually northerly winds between 03 and 09Z. Gusts up to 20 kt are possible just behind the front. Low confidence on IFR conditions developing, but moderate confidence on other aspects of the forecast. Wednesday...Through the day, ceilings are likely to improve to VFR conditions, though should stay around 5000 ft AGL. Northeasterly winds near or below 10 kt. Moderate confidence. Outlook... Wednesday night through Friday...MVFR/IFR conditions are expected to prevail through Thursday night, then improvement occurs Friday as a storm system moves away. Periods of rain, which then ends Friday. Some sleet and freezing rain should occur at the onset later Wednesday night for RDG to ABE. Northeast to east winds 5-10 knots become southeasterly Thursday especially from the PHL area south and eastward, then southerly Thursday night. Winds shift to the west and northwest Friday and increase to around 15 knots with gusts to 20-30 knots. High confidence in sub-VFR conditions; low confidence in winds especially prior to Friday. Saturday...VFR with increasing clouds. West to southwest winds less than 10 knots. Moderate confidence. && .MARINE... Winds and seas will stay below Small Craft Advisory through the day today. Overnight, a cold front will bring an abrupt shift to northwesterly winds, and wind gusts above 20 kt are likely behind the front, especially on the Atlantic Coastal Waters. For now though, it looks like conditions may remain just below SCA criteria overnight. Wednesday...SCA conditions are possible as waves could build above 5 feet on the Atlantic Coastal Waters along with continued northwesterly wind gusts near 25 kt. Outlook... Wednesday night and Thursday...Winds should gust to around 25 knots at times, however warmer air will be over cooler waters. Seas should build to 4-6 feet mainly on the Atlantic coastal waters. Friday and Saturday...Small Craft Advisory probable; low end gales possible with offshore flow. Winds then diminish later Friday night and Saturday. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && Synopsis...Gorse Near Term...Johnson Short Term...Johnson Long Term...Gorse Aviation...Gorse/Johnson Marine...Gorse/Johnson
Hazardous weather outlook, Feb 4, 3:46 AM EST, 11 hours 8 minutes before
Hazardous Weather Outlook National Weather Service Mount Holly NJ 346 AM EST Tue Feb 4 2020 NJZ001-007>009-PAZ054-055-060>062-103-105-050900- Sussex-Warren-Morris-Hunterdon-Carbon-Monroe-Berks-Lehigh- Northampton-Western Montgomery-Upper Bucks- 346 AM EST Tue Feb 4 2020 This Hazardous Weather Outlook is for northern New Jersey, northwest New Jersey, east central Pennsylvania, northeast Pennsylvania and southeast Pennsylvania. .DAY ONE...Today and tonight. The probability of widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A period of sleet and freezing rain Wednesday and Thursday morning may result in areas of hazardous travel. The greatest chance for a period of icing looks to be the I-80 corridor. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. DEZ001>004-MDZ008-012-015-019-020-NJZ010-012>027-PAZ070-071-101-102- 104-106-050900- New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Chester- Eastern Chester-Eastern Montgomery-Lower Bucks- 346 AM EST Tue Feb 4 2020 This Hazardous Weather Outlook is for central Delaware, northern Delaware, southern Delaware, northeast Maryland, central New Jersey, northern New Jersey, southern New Jersey and southeast Pennsylvania. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. ANZ430-431-450>455-050900- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 346 AM EST Tue Feb 4 2020 This Hazardous Weather Outlook is for Atlantic coastal waters and Delaware Bay Waters. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A period of low-end west-northwest gales are possible Friday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 4, 3:32 PM EST | Small Craft Advisory | PHI | 27 hr |
Nearby
Winter Weather Advisories in Pennsylvania, 2020Winter Weather Advisories in New Jersey, 2020Every winter weather advisory in 2020
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.