Alert archive / New Jersey / Freeze Watches in 2020

Freeze Watch 2, NWS Philadelphia/Mount Holly

April 15, 20204 states

NWS Philadelphia/Mount Holly issued this freeze watch at Apr 15, 2020, 2:52 AM EDT for 4 states. It took effect at Apr 17, 2020, 12:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Apr 15, 2020, 2:52 AM EDT (06:52 UTC)
In effect from
Apr 17, 2020, 12:00 AM EDT
Expired
Apr 16, 2020, 3:19 PM EDT
In force
Issued by
NWS Philadelphia/Mount Holly
All 25 counties

Kent County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Cumberland County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Somerset County, NJ, Sussex 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), 66 km from the middle of the area, began a volume at 06:56 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.9 hours before the alert went out and 221 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, Washington/Dulle, VA at 00:00Z on 2020-04-15Temperature 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, Washington/Dulle, VA at 00:00Z on 2020-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.1939587897117136156Sfc1 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
1911 m above ground
0-6 km bulk shear
100 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
424 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

494 
WWUS71 KPHI 150652
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
252 AM EDT Wed Apr 15 2020

NJZ008>010-PAZ103-105-152000-
/O.NEW.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Morris-Hunterdon-Somerset-Western Montgomery-Upper Bucks-
Including the cities of Morristown, Flemington, Somerville, 
Collegeville, Pottstown, Chalfont, and Perkasie
252 AM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...
...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...For the Frost Advisory, temperatures as low as 33 will
  result in frost formation. For the Freeze Watch, sub-freezing
  temperatures as low as 30 possible.

* WHERE...In New Jersey, Morris, Hunterdon and Somerset. In 
  Pennsylvania, Western Montgomery and Upper Bucks.

* WHEN...For the Frost Advisory, from 1 AM to 9 AM EDT Thursday. 
  For the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ001-007-PAZ060>062-152000-
/O.NEW.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Sussex-Warren-Berks-Lehigh-Northampton-
Including the cities of Newton, Washington, Reading, Allentown, 
Bethlehem, and Easton
252 AM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...
...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...For the Frost Advisory, temperatures as low as 31 will
  result in frost formation. For the Freeze Watch, sub-freezing
  temperatures as low as 30 possible.

* WHERE...In New Jersey, Sussex and Warren. In Pennsylvania, 
  Berks, Lehigh and Northampton.

* WHEN...For the Frost Advisory, from 1 AM to 9 AM EDT Thursday. 
  For the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ012-013-015>022-027-PAZ101-152000-
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Middlesex-Western Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-
Southeastern Burlington-Western Chester-
Including the cities of New Brunswick, Freehold, Trenton, 
Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, 
Mount Holly, Jackson, Millville, Hammonton, Wharton State Forest,
Honey Brook, and Oxford
252 AM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

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

* WHEN...From 1 AM to 9 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Staarmann
5 follow-up statements
024 
WWUS71 KPHI 151928
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
328 PM EDT Wed Apr 15 2020

NJZ001-007>010-PAZ060>062-103-105-160830-
/O.CAN.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, 
Collegeville, Pottstown, Chalfont, and Perkasie
328 PM EDT Wed Apr 15 2020

...FREEZE WATCH REMAINS IN EFFECT FROM LATE THURSDAY NIGHT
THROUGH FRIDAY MORNING...
...FROST ADVISORY IS CANCELLED...

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

* WHERE...In New Jersey, Morris, Hunterdon, Sussex, Warren and 
  Somerset. In Pennsylvania, Upper Bucks, Western Montgomery, 
  Northampton, Lehigh and Berks.

* WHEN...From late Thursday night through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

* ADDITIONAL DETAILS...Frost Advisory is cancelled due to an
  increase in forecast wind speeds which should prevent widespread
  frost formation even as temperatures drop into the lower 30s.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ012-015-160830-
/O.CAN.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
/O.EXA.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Middlesex-Mercer-
Including the cities of New Brunswick and Trenton
328 PM EDT Wed Apr 15 2020

...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...
...FROST ADVISORY IS CANCELLED...

* WHAT...Sub-freezing temperatures as low as 31 possible.

* WHERE...Middlesex and Mercer.

* WHEN...From late Thursday night through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

* ADDITIONAL DETAILS...Frost Advisory is cancelled due to an
  increase in forecast wind speeds which should prevent widespread
  frost formation even as temperatures drop into the lower 30s.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

PAZ101-152030-
/O.CAN.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Western Chester-
Including the cities of Honey Brook and Oxford
328 PM EDT Wed Apr 15 2020

...FROST ADVISORY IS CANCELLED...

Frost Advisory is cancelled due to an increase in forecast wind 
speeds which should prevent widespread frost formation even as 
temperatures drop into the lower 30s.

$$

NJZ013-019>022-027-160830-
/O.EXA.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Western Monmouth-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-
Including the cities of Freehold, Moorestown, Mount Holly, 
Jackson, Millville, Hammonton, and Wharton State Forest
328 PM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...
...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...For the Frost Advisory, temperatures as low as 34 will 
  result in frost formation. For the Freeze Watch, sub-freezing 
  temperatures as low as 32 possible.

* WHERE...Western Monmouth, Northwestern Burlington, Ocean, 
  Cumberland, Atlantic and Southeastern Burlington.

* WHEN...For the Frost Advisory, from 1 AM to 9 AM EDT Thursday. 
  For the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ016>018-160830-
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Salem-Gloucester-Camden-
Including the cities of Pennsville, Glassboro, Camden, 
and Cherry Hill
328 PM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...

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

* WHERE...Gloucester, Salem and Camden.

* WHEN...From 1 AM to 9 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Deal
803 
WWUS71 KPHI 152116
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
516 PM EDT Wed Apr 15 2020

NJZ013-019>022-027-161030-
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Western Monmouth-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-
Including the cities of Freehold, Moorestown, Mount Holly, 
Jackson, Millville, Hammonton, and Wharton State Forest
516 PM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE THURSDAY NIGHT
THROUGH FRIDAY MORNING...

* WHAT...For the Frost Advisory, temperatures as low as 34 will 
  result in frost formation. For the Freeze Watch, sub-freezing 
  temperatures as low as 30 possible.

* WHERE...Southeastern Burlington, Atlantic, Ocean, Cumberland, 
  Western Monmouth and Northwestern Burlington.

* WHEN...For the Frost Advisory, from 1 AM to 9 AM EDT Thursday. 
  For the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ016>018-161030-
/O.CON.KPHI.FR.Y.0001.200416T0500Z-200416T1300Z/
Salem-Gloucester-Camden-
Including the cities of Pennsville, Glassboro, Camden, 
and Cherry Hill
516 PM EDT Wed Apr 15 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM EDT
THURSDAY...

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

* WHERE...Gloucester, Salem and Camden.

* WHEN...From 1 AM to 9 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

PAZ101-161030-
/O.EXA.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Western Chester-
Including the cities of Honey Brook and Oxford
516 PM EDT Wed Apr 15 2020

...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...Sub-freezing temperatures as low as 31 possible.

* WHERE...Western Chester.

* WHEN...From late Thursday night through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ001-007>010-012-015-PAZ060>062-103-105-161030-
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-
Lehigh-Northampton-Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Trenton, Reading, 
Allentown, Bethlehem, Easton, Collegeville, Pottstown, Chalfont, 
and Perkasie
516 PM EDT Wed Apr 15 2020

...FREEZE WATCH REMAINS IN EFFECT FROM LATE THURSDAY NIGHT
THROUGH FRIDAY MORNING...

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

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

* WHEN...From late Thursday night through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
578 
WWUS71 KPHI 160703
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
303 AM EDT Thu Apr 16 2020

NJZ013-019>022-027-162015-
/O.CON.KPHI.FR.Y.0001.000000T0000Z-200416T1300Z/
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Western Monmouth-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-
Including the cities of Freehold, Moorestown, Mount Holly, 
Jackson, Millville, Hammonton, and Wharton State Forest
303 AM EDT Thu Apr 16 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...

* WHAT...For the Frost Advisory, temperatures as low as 34 will 
  result in frost formation. For the Freeze Watch, sub-freezing 
  temperatures as low as 27 possible.

* WHERE...Southeastern Burlington, Atlantic, Ocean, Cumberland, 
  Western Monmouth and Northwestern Burlington.

* WHEN...For the Frost Advisory, until 9 AM EDT this morning. 
  For the Freeze Watch, from late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ016>018-161300-
/O.CON.KPHI.FR.Y.0001.000000T0000Z-200416T1300Z/
Salem-Gloucester-Camden-
Including the cities of Pennsville, Glassboro, Camden, 
and Cherry Hill
303 AM EDT Thu Apr 16 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

* WHERE...Gloucester, Salem and Camden.

* WHEN...Until 9 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.

&&

$$

DEZ002-003-MDZ008-012-015-019-020-PAZ102-162015-
/O.EXA.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-Caroline-
Eastern Chester-
Including the cities of Dover, Georgetown, Elkton, Chestertown, 
Centreville, Easton, Denton, West Chester, and Kennett Square
303 AM EDT Thu Apr 16 2020

...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
MORNING...

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

* WHERE...In Pennsylvania, Eastern Chester. In Maryland, Cecil, 
  Kent MD, Queen Annes, Talbot and Caroline. In Delaware, Kent 
  and Inland Sussex.

* WHEN...From late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ001-007>010-012-015-PAZ060>062-101-103-105-162015-
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-
Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Trenton, Reading, 
Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, 
Pottstown, Chalfont, and Perkasie
303 AM EDT Thu Apr 16 2020

...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...

* WHAT...Sub-freezing temperatures as low as 29 possible.

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

* WHEN...From late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
567 
WWUS71 KPHI 161019
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
619 AM EDT Thu Apr 16 2020

NJZ013-019>022-027-162330-
/O.CAN.KPHI.FR.Y.0001.000000T0000Z-200416T1300Z/
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Western Monmouth-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-
Including the cities of Freehold, Moorestown, Mount Holly, 
Jackson, Millville, Hammonton, and Wharton State Forest
619 AM EDT Thu Apr 16 2020

...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...
...FROST ADVISORY IS CANCELLED...

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

* WHERE...Atlantic, Ocean, Cumberland, Western Monmouth, 
  Northwestern Burlington and Southeastern Burlington.

* WHEN...From late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ016>018-161130-
/O.CAN.KPHI.FR.Y.0001.000000T0000Z-200416T1300Z/
Salem-Gloucester-Camden-
Including the cities of Pennsville, Glassboro, Camden, 
and Cherry Hill
619 AM EDT Thu Apr 16 2020

...FROST ADVISORY IS CANCELLED...

Temperatures will continue to increase through the morning.
Therefore, the frost advisory for Thursday morning has been
cancelled. However, another cold night is expected Thursday night
into Friday morning. Another frost advisory may be issued.

$$

DEZ002-003-MDZ008-012-015-019-020-NJZ001-007>010-012-015-
PAZ060>062-101>103-105-162330-
/O.CON.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-Caroline-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-
Lehigh-Northampton-Western Chester-Eastern Chester-
Western Montgomery-Upper Bucks-
Including the cities of Dover, Georgetown, Elkton, Chestertown, 
Centreville, Easton, Denton, Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Trenton, Reading, 
Allentown, Bethlehem, Honey Brook, Oxford, West Chester, 
Kennett Square, Collegeville, Pottstown, Chalfont, and Perkasie
619 AM EDT Thu Apr 16 2020

...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...

* WHAT...Sub-freezing temperatures as low as 28 possible.

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

* WHEN...From late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
906 
WWUS71 KPHI 161919
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
319 PM EDT Thu Apr 16 2020

DEZ002-003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015-
019>022-027-PAZ060>062-101>103-105-170830-
/O.UPG.KPHI.FZ.A.0002.200417T0400Z-200417T1300Z/
/O.NEW.KPHI.FZ.W.0002.200417T0400Z-200417T1300Z/
Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-Caroline-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Mercer-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Southeastern Burlington-Berks-Lehigh-Northampton-
Western Chester-Eastern Chester-Western Montgomery-Upper Bucks-
Including the cities of Dover, Georgetown, Elkton, Chestertown, 
Centreville, Easton, Denton, Newton, Washington, Morristown, 
Flemington, Somerville, New Brunswick, Freehold, Trenton, 
Moorestown, Mount Holly, Jackson, Millville, Hammonton, 
Wharton State Forest, Reading, Allentown, Bethlehem, Honey Brook,
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Chalfont, and Perkasie
319 PM EDT Thu Apr 16 2020

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

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

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

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

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NJZ016>018-023-PAZ104-106-170830-
/O.NEW.KPHI.FZ.W.0002.200417T0400Z-200417T1300Z/
Salem-Gloucester-Camden-Cape May-Eastern Montgomery-Lower Bucks-
Including the cities of Pennsville, Glassboro, Camden, 
Cherry Hill, Cape May Court House, Norristown, Lansdale, 
Morrisville, and Doylestown
319 PM EDT Thu Apr 16 2020

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

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

* WHERE...In New Jersey, Salem, Gloucester, Camden and Cape May. 
  In Pennsylvania, Eastern Montgomery and Lower Bucks.

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

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

DEZ001-PAZ070-071-170830-
/O.NEW.KPHI.FR.Y.0002.200417T0400Z-200417T1300Z/
New Castle-Delaware-Philadelphia-
Including the cities of Wilmington, Media, and Philadelphia
319 PM EDT Thu Apr 16 2020

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

* WHAT...Temperatures as low as 32 will result in frost 
  formation.

* WHERE...In Pennsylvania, Delaware and Philadelphia. In 
  Delaware, New Castle.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

What forecasters said that day

The local office's own words before this freeze watch 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 freeze watch went out at Apr 14, 9:20 PM EDT, 5 hours 32 minutes earlier.

Area forecast discussion, Apr 14, 9:20 PM EDT, 5 hours 32 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
920 PM EDT Tue Apr 14 2020

.SYNOPSIS...
High pressure will continue slide across the region through
this evening. A low pressure riding along a front to our
southeast will bring some precipitation to portions of our
region tonight into Wednesday. An upper level trough is expected
to track through the region Thursday as high pressure builds
into the area heading towards the weekend. A low pressure system
should briefly impact the region Friday night into Saturday
with High pressure returned for the weekend.
&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
9 PM Update...As of mid evening, some very light precip
beginning to move into portions of the Lehigh Valley and
southern Poconos into NW NJ. Somewhat heavier precip still off
to the south and west but will be moving in over the next couple
hours. Some adjustments were made to temperature grids over the
north as they've been cooling a little faster than previously
forecast as the precip moves in. Also made some minor
adjustments to POP grids for this evening but otherwise,
forecast on track.

Previous Discussion: Surface trough and mid level shortwave
will move through area tonight with some light showers moving
through the region. Clouds will increase through this evening
and showers will move in tonight, with the bulk of the region
seeing light precipitation closer to midnight. Not a lot of
moisture to work with (unlike what we had on Monday) so expect
totals to be fairly light. Most areas will see around a tenth of
an inch or less with some places in our southern areas may see
up to a quarter of an inch. Most of the showers should end by
early morning, with just a few showers remaining along the
coastal strip of NJ and DE.

Colder air will push down from the north and few snow flakes
may mix in across the higher elevations of the southern Poconos.
Not expecting much in the way of accumulation but we could see
a few tenths accumulate on the ground in a few spots.

Overnight lows will generally be in the mid/upper 30s to around
40 with some upper 20s possible across portions of the southern
Poconos.
&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/...
Strong upper level jet will drop down through our region and
move to our south through the day.

Any lingering showers should end from west to east, but should
mainly be confined to our eastern areas in the morning, clearing
by around midday. Once the last of the showers move through,
expect a fairly nice day across the region with clearing skies.
High pressure briefly noses northward but quickly slides
offshore to our south and we will have a northwest flow across
our area. This will bring some cooler air into the forecast
area. While temperatures may reach into the lower 50s in much of
the area, with the northwest wind blowing, it will feel
markedly cooler even with the sunshine later in the day.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/...
Wednesday night as high pressure builds into the region we
should see temps well below normal. We'll see a short wave
tracking across southern New York that may cause some light
precipitation across the northern portion of the forecast area
however any precip should be light. The challenge over night as
temps fall is that the winds should start to decouple overnight
which will allow for the formation of light frost across much of
the forecast area. With the growing season considering open now
we've opted to issue a Frost Advisory for portions of southeast
PA and portions of New Jersey generally excluding the southern
I-95 corridor and the coastline. The thinking is that the Pine
Barrens will likely cool more than guidance especially under
light winds and wet bulb temps are anticipated as it is to be
generally 34 or less in the affected areas which would support
freezing temps at the surface.

High pressure builds into the region and we should see a
pleasant day Thursday into Thursday night with partly cloudy
skies and relatively chilly highs only in the 40s to low 50s. A
weak low pressure system is to approach our region on late in
the afternoon Friday. The precip shield appears to be relatively
thin however we should see a couple of tenths of rainfall as
the system tracks through.

Heading into the weekend high pressure looks to be the theme as
a low pressure system eventually develops and slides to our
south. As the midnight side mentioned, we confidence isn't real
high because there's quite the spread in timing of that system..

&&

.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Tonight...MVFR ceilings developing around 03Z with IFR ceilings
possible after 06Z. Ceilings will become VFR at RDG/ABE by 12Z.
Light rain after 03Z at all terminals with some visibility
restrictions to MVFR possible. Northwesterly winds around 5-10
kts becoming northerly by 12Z. Moderate confidence.

Wednesday...Initially MVFR ceilings for the I-95 terminal and
south (with some IFR possible) will become VFR for the I-95
terminals by mid morning. Initially northerly winds of 5-10 kts
will increase to 10-15 kts after 18Z and become northwesterly.
Moderate confidence.

Outlook...

Thursday...Mostly VFR conditions expected. West to northwest
winds around 10 to 15 knots with gusts up to 20 kt. Moderate
confidence.

Friday...VFR conditions expected lowering to MVFR or lower as
showers overspread the terminals. Light and variable winds
becoming southerly or southwesterly at 5 to 10 kt. Moderate
confidence on the overall pattern, but low confidence on the
timing of any category changes.

Saturday...VFR conditions are likely with brief periods of MVFR
ceilings especially later in the day. Light and variable winds.
Low confidence.

&&

.MARINE...
A strengthening north-northwest flow overnight may allow for a
few gusts around 25 knots early Wednesday morning, mainly over
the southern coastal waters but it looks fairly marginal at this
time and will hold off on issuing any new headlines.

Outlook...

Wednesday...Conditions are forecast to generally remain below
SCA criteria. Rain showers in the morning. Seas 2-4 feet with
winds offshore around 10-15 kts with gusts up to 25 kts
possible.

Thursday...Winds should increase to near SCA criteria,
especially on the coastal waters through the day with waves up
to 4 feet.

Friday...Winds and seas should stay below SCA criteria.

Saturday...Seas may build above 5 ft on the coastal waters
Friday night into Saturday.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Frost Advisory from 1 AM to 9 AM EDT Thursday for PAZ060>062-
     101-103-105.
NJ...Frost Advisory from 1 AM to 9 AM EDT Thursday for NJZ001-
     007>010-012-013-015-019>021-027.
DE...None.
MD...None.
MARINE...None.

&&

Synopsis...Deal
Near Term...Fitzsimmons/Meola
Short Term...Meola
Long Term...Deal
Aviation...Deal/Meola
Marine...Deal/Meola
Hazardous weather outlook, Apr 14, 3:37 PM EDT, 11 hours 15 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
337 PM EDT Tue Apr 14 2020

NJZ001-007>010-012-013-015-019>021-027-PAZ060>062-101-103-105-151945-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Mercer-Northwestern Burlington-Ocean-Cumberland-
Southeastern Burlington-Berks-Lehigh-Northampton-Western Chester-
Western Montgomery-Upper Bucks-
337 PM EDT Tue Apr 14 2020

...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM EDT THURSDAY...

This Hazardous Weather Outlook is for central New Jersey, northern
New Jersey, northwest New Jersey, southern New Jersey, east central
Pennsylvania and southeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Frost Advisory.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

DEZ001>004-MDZ008-012-015-019-020-NJZ014-016>018-022>026-PAZ054-055-
070-071-102-104-106-151945-
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Eastern Monmouth-Salem-Gloucester-Camden-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Carbon-Monroe-Delaware-Philadelphia-Eastern Chester-
Eastern Montgomery-Lower Bucks-
337 PM EDT Tue Apr 14 2020

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, central New
Jersey, southern New Jersey, northeast Pennsylvania and southeast
Pennsylvania.

.DAY ONE...This afternoon 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...

Spotter activation is not expected at this time.

ANZ430-431-450>455-151945-
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-
337 PM EDT Tue Apr 14 2020

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...This afternoon 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...

Spotter activation is not expected at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 2:10 AM EDTSmall Craft AdvisoryPHI9 hr
Apr 15, 3:09 AM EDTSmall Craft AdvisoryPHI45 hr

Nearby

Freeze Watches in New Jersey, 2020Freeze Watches in Pennsylvania, 2020Freeze Watches in Maryland, 2020Every freeze watch 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.