Alert archive / New Jersey / Frost Advisories in 2020

Frost Advisory 7, NWS Philadelphia/Mount Holly

May 12, 20205 counties in Pennsylvania; 13 counties in New Jersey

NWS Philadelphia/Mount Holly issued this frost advisory at May 12, 2020, 2:25 PM EDT for 5 counties in Pennsylvania; 13 counties in New Jersey. It took effect at May 13, 2020, 2:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 12, 2020, 2:25 PM EDT (18:25 UTC)
In effect from
May 13, 2020, 2:00 AM EDT
Expired
May 13, 2020, 8:00 AM EDT
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland 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, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 50 km from the middle of the area, began a volume at 18:30 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, 6.4 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2020-05-12Temperature 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, Brookhaven, NY at 12:00Z on 2020-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.19395878Sfc1 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
1121 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

123 
WWUS71 KPHI 121825
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
225 PM EDT Tue May 12 2020

NJZ007-PAZ062-130730-
/O.EXB.KPHI.FZ.W.0009.200513T0400Z-200513T1300Z/
Warren-Northampton-
Including the cities of Washington, Bethlehem, and Easton
225 PM EDT Tue May 12 2020

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
WEDNESDAY...

* WHAT...Sub-freezing temperatures of 30 to 32 degrees expected.

* WHERE...In New Jersey, Warren. In Pennsylvania, Northampton.

* WHEN...From midnight tonight to 9 AM EDT Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ001-PAZ054-055-130730-
/O.EXT.KPHI.FZ.W.0009.200513T0400Z-200513T1300Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
225 PM EDT Tue May 12 2020

...FREEZE WARNING NOW IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 27 expected.

* WHERE...In Pennsylvania, Carbon and Monroe. In New Jersey, 
  Sussex.

* WHEN...From midnight tonight to 9 AM EDT Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ008>010-012-013-015>022-027-PAZ060-061-101>106-130730-
/O.NEW.KPHI.FR.Y.0007.200513T0600Z-200513T1200Z/
Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-Berks-Lehigh-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Morristown, Flemington, Somerville, 
New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, 
Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, 
Hammonton, Wharton State Forest, Reading, Allentown, Honey Brook,
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
225 PM EDT Tue May 12 2020

...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM EDT WEDNESDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Portions of central, northern, northwest and southern 
  New Jersey and east central and southeast Pennsylvania.

* WHEN...From 2 AM to 8 AM EDT Wednesday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Staarmann
3 follow-up statements
448 
WWUS71 KPHI 130402
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
1202 AM EDT Wed May 13 2020

NJZ001-007-PAZ054-055-062-131300-
/O.CON.KPHI.FZ.W.0009.000000T0000Z-200513T1300Z/
Sussex-Warren-Carbon-Monroe-Northampton-
Including the cities of Newton, Washington, Jim Thorpe, 
Stroudsburg, Bethlehem, and Easton
1202 AM EDT Wed May 13 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS 
MORNING...

* WHAT...Sub-freezing temperatures as low as 28 to 32.

* WHERE...In New Jersey, Warren and Sussex. In Pennsylvania, 
  Carbon, Monroe and Northampton.

* WHEN...Until 9 AM EDT this morning.

* IMPACTS...Frost and freeze conditions will kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ008>010-012-013-015>022-027-PAZ060-061-101>106-131200-
/O.CON.KPHI.FR.Y.0007.200513T0600Z-200513T1200Z/
Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-Berks-Lehigh-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Morristown, Flemington, Somerville, 
New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, 
Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, 
Hammonton, Wharton State Forest, Reading, Allentown, Honey Brook,
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
1202 AM EDT Wed May 13 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Portions of central, northern, northwest and southern 
  New Jersey and east central and southeast Pennsylvania.

* WHEN...Until 8 AM EDT this morning.

* IMPACTS...Frost could kill sensitive outdoor vegetation if left
  uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
987 
WWUS71 KPHI 130726
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
326 AM EDT Wed May 13 2020

NJZ001-007-PAZ054-055-062-131200-
/O.EXT.KPHI.FZ.W.0009.000000T0000Z-200513T1200Z/
Sussex-Warren-Carbon-Monroe-Northampton-
Including the cities of Newton, Washington, Jim Thorpe, 
Stroudsburg, Bethlehem, and Easton
326 AM EDT Wed May 13 2020

...FREEZE WARNING NOW IN EFFECT UNTIL 8 AM EDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 30 degrees.

* WHERE...The Pennsylvania counties of Carbon, Monroe and 
  Northampton. The New Jersey counties of Sussex and Warren. 

* WHEN...Until 8:00 AM this morning.

* IMPACTS...Frost and freezing conditions may damage crops and 
  other sensitive vegetation.

* ADDITIONAL INFORMATION...Frost is again possible early on 
  Thursday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ008>010-012-013-015>022-027-PAZ060-061-101>106-131200-
/O.CON.KPHI.FR.Y.0007.000000T0000Z-200513T1200Z/
Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-Berks-Lehigh-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Morristown, Flemington, Somerville, 
New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, 
Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, 
Hammonton, Wharton State Forest, Reading, Allentown, Honey Brook,
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
326 AM EDT Wed May 13 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING...

* WHAT...A light wind and temperatures as low as 35 degrees will 
  allow areas of frost to develop.

* WHERE...Parts of southeastern Pennsylvania and New Jersey.

* WHEN...Until 8:00 AM this morning.

* IMPACTS...Frost may damage sensitive outdoor vegetation if left
  uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Iovino
833 
WWUS71 KPHI 131153
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
753 AM EDT Wed May 13 2020

NJZ001-007-PAZ054-055-062-131300-
/O.EXP.KPHI.FZ.W.0009.000000T0000Z-200513T1200Z/
Sussex-Warren-Carbon-Monroe-Northampton-
Including the cities of Newton, Washington, Jim Thorpe, 
Stroudsburg, Bethlehem, and Easton
753 AM EDT Wed May 13 2020

...FREEZE WARNING WILL EXPIRE AT 8 AM EDT THIS MORNING...

Temperatures are warming quickly above freezing this morning.
Therefore, the Freeze Warning will be allowed to expire.

$$

NJZ008>010-012-013-015>022-027-PAZ060-061-101>106-131300-
/O.EXP.KPHI.FR.Y.0007.000000T0000Z-200513T1200Z/
Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-Berks-Lehigh-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Morristown, Flemington, Somerville, 
New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, 
Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, 
Hammonton, Wharton State Forest, Reading, Allentown, Honey Brook,
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
753 AM EDT Wed May 13 2020

...FROST ADVISORY WILL EXPIRE AT 8 AM EDT THIS MORNING...

Temperatures are warming quickly into the 40s this morning and no
additional frost development is expected. Therefore, the Frost
Advisory will be allowed to expire.

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 9:22 AM EDTFreeze WarningPHICarbon, Monroe, Northampton23 hr

Nearby

Frost Advisories in New Jersey, 2020Frost Advisories in Pennsylvania, 2020Every frost 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.