Alert archive / New Jersey / Frost Advisories in 2020

Frost Advisory 6, NWS Philadelphia/Mount Holly

May 11, 20206 counties in Pennsylvania; 8 counties in New Jersey; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this frost advisory at May 11, 2020, 3:24 AM EDT for 6 counties in Pennsylvania; 8 counties in New Jersey; Cecil County, Maryland. It took effect at May 12, 2020, 12:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 11, 2020, 3:24 AM EDT (07:24 UTC)
In effect from
May 12, 2020, 12:00 AM EDT
Expired
May 12, 2020, 6:16 AM EDT
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly

Counties Cecil County, MD, Atlantic County, NJ, Burlington County, NJ, Cumberland County, NJ, Hunterdon County, NJ, Morris County, NJ, Ocean County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 07:24 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 00:00Z, 7.4 hours before the alert went out and 203 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 00:00Z on 2020-05-11Temperature 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 00:00Z on 2020-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.1939587897117136Sfc1 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
1493 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

105 
WWUS71 KPHI 110724
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
324 AM EDT Mon May 11 2020

NJZ001-PAZ054-055-112200-
/O.NEW.KPHI.FZ.W.0008.200512T0400Z-200512T1300Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
324 AM EDT Mon May 11 2020

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

* WHAT...Sub-freezing temperatures between 28 and 32 degrees 
  expected.

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

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

* 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.

&&

$$

MDZ008-NJZ007>010-PAZ060>062-101>103-105-112200-
/O.NEW.KPHI.FR.Y.0006.200512T0400Z-200512T1300Z/
Cecil-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-Upper Bucks-
Including the cities of Elkton, Washington, Morristown, 
Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Chalfont, and Perkasie
324 AM EDT Mon May 11 2020

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
TUESDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

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

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
3 follow-up statements
841 
WWUS71 KPHI 111953
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
353 PM EDT Mon May 11 2020

NJZ001-PAZ054-055-121000-
/O.CON.KPHI.FZ.W.0008.200512T0400Z-200512T1300Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
353 PM EDT Mon May 11 2020

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

* WHAT...Sub-freezing temperatures between 28 and 32 degrees 
  expected.

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

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

* 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.

&&

$$

NJZ020>022-027-121000-
/O.EXA.KPHI.FR.Y.0006.200512T0400Z-200512T1300Z/
Ocean-Cumberland-Atlantic-Southeastern Burlington-
Including the cities of Jackson, Millville, Hammonton, 
and Wharton State Forest
353 PM EDT Mon May 11 2020

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
TUESDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Interior portions of southern New Jersey.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

MDZ008-NJZ007>010-PAZ060>062-101>103-105-121000-
/O.CON.KPHI.FR.Y.0006.200512T0400Z-200512T1300Z/
Cecil-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-Upper Bucks-
Including the cities of Elkton, Washington, Morristown, 
Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Chalfont, and Perkasie
353 PM EDT Mon May 11 2020

...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT TUESDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

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

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
916 
WWUS71 KPHI 120734
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
334 AM EDT Tue May 12 2020

NJZ020>022-027-120845-
/O.CAN.KPHI.FR.Y.0006.000000T0000Z-200512T1300Z/
Ocean-Cumberland-Atlantic-Southeastern Burlington-
Including the cities of Jackson, Millville, Hammonton, 
and Wharton State Forest
334 AM EDT Tue May 12 2020

...FROST ADVISORY IS CANCELLED...

Frost is no longer expected in interior sections of southern New 
Jersey early this morning. As a result, the Frost Advisory has 
been cancelled.

$$

NJZ001-PAZ054-055-121200-
/O.EXT.KPHI.FZ.W.0008.000000T0000Z-200512T1200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
334 AM EDT Tue May 12 2020

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

* WHAT...Sub-freezing temperatures between 30 and 32 degrees are 
  expected.

* WHERE...The Pennsylvania counties of Carbon and Monroe, and 
  Sussex County in New Jersey.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

MDZ008-NJZ007>010-PAZ060>062-101>103-105-121200-
/O.EXT.KPHI.FR.Y.0006.000000T0000Z-200512T1200Z/
Cecil-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-Upper Bucks-
Including the cities of Elkton, Washington, Morristown, 
Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Chalfont, and Perkasie
334 AM EDT Tue May 12 2020

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

* WHAT...Temperatures as low as 34 to 36 degrees may allow frost 
  to develop.

* WHERE...Parts of northeastern Maryland, southeastern 
  Pennsylvania, and northern New Jersey.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Iovino
890 
WWUS71 KPHI 121016
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
616 AM EDT Tue May 12 2020

NJZ001-PAZ054-055-121130-
/O.CAN.KPHI.FZ.W.0008.000000T0000Z-200512T1200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
616 AM EDT Tue May 12 2020

...FREEZE WARNING IS CANCELLED...

Temperatures are no longer expected to fall below freezing this 
morning. As a result, the Freeze Warning has been cancelled.

Very cold temperatures are forecast for early Wednesday morning 
with another potential for frost or freezing temperatures at that 
time.

$$

MDZ008-NJZ007>010-PAZ060>062-101>103-105-121130-
/O.CAN.KPHI.FR.Y.0006.000000T0000Z-200512T1200Z/
Cecil-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-Upper Bucks-
Including the cities of Elkton, Washington, Morristown, 
Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, 
Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, 
Pottstown, Chalfont, and Perkasie
616 AM EDT Tue May 12 2020

...FROST ADVISORY IS CANCELLED...

Frost is no longer expected this morning. As a result, the Frost 
Advisory has been cancelled.

Very cold temperatures are forecast for early Wednesday morning 
with another potential for frost at that time.

$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 3:24 AM EDTFreeze WarningPHICarbon, Monroe27 hr
May 11, 2:25 PM EDTSpecial Weather StatementPHILehigh35 min
May 11, 2:28 PM EDTSpecial Weather StatementPHIBucks32 min
May 11, 3:34 AM EDTSmall Craft AdvisoryPHI38 hr
May 11, 12:22 PM EDTSpecial Weather StatementPHIMiddlesex23 min
May 11, 12:35 PM EDTSpecial Weather StatementPHIMonmouth25 min
May 11, 12:44 PM EDTSpecial Weather StatementPHIMonmouth16 min
May 11, 1:00 PM EDTSpecial Weather StatementPHIMonmouth45 min

Nearby

Frost Advisories in New Jersey, 2020Frost Advisories in Pennsylvania, 2020Frost Advisories in Maryland, 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.