Alert archive / New Jersey / Freeze Watches in 2012

Freeze Watch 6, NWS Philadelphia/Mount Holly

April 29, 20125 counties in New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this freeze watch at Apr 29, 2012, 4:00 AM EDT for 5 counties in New Jersey; 5 counties in Pennsylvania. It took effect at Apr 30, 2012, 2:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Apr 29, 2012, 4:00 AM EDT (08:00 UTC)
In effect from
Apr 30, 2012, 2:00 AM EDT
Expired
Apr 29, 2012, 9:43 AM EDT
In force
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, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 08:01 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, 8.0 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2012-04-29Temperature 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 2012-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.1939587897117Sfc1 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
2135 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

603 
WWUS71 KPHI 290800
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
400 AM EDT SUN APR 29 2012

NJZ001-PAZ054-055-292000-
/O.NEW.KPHI.FZ.A.0006.120430T0600Z-120430T1200Z/
/O.CON.KPHI.FZ.W.0010.000000T0000Z-120429T1200Z/
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
400 AM EDT SUN APR 29 2012

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
MORNING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FREEZE
WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
MORNING.

* LOW TEMPERATURES...UPPER 20 TO LOW 30S THIS MORNING. MID TO
  UPPER 20S EARLY MONDAY MORNING.

* IMPACTS...FLOWERING FRUIT TREES AND OTHER SENSITIVE VEGETATION 
  WILL SUFFER DAMAGE IF NOT PROTECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR
HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER
SENSITIVE VEGETATION.

A FREEZE WATCH MEANS SUB-FREEZING TEMPERATURES ARE POSSIBLE.
THESE CONDITIONS COULD KILL CROPS AND OTHER SENSITIVE VEGETATION.

&&

$$

NJZ007-008-PAZ060>062-292000-
/O.NEW.KPHI.FZ.A.0006.120430T0600Z-120430T1200Z/
/O.CON.KPHI.FR.Y.0007.000000T0000Z-120429T1200Z/
WARREN-MORRIS-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...WASHINGTON...MORRISTOWN...READING...
ALLENTOWN...BETHLEHEM...EASTON
400 AM EDT SUN APR 29 2012

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
MORNING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FREEZE
WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
MORNING.

* LOW TEMPERATURES...MID TO UPPER UPPER 30S THIS MORNING. UPPER
  20S TO LOW 30S MONDAY MORNING.

* IMPACTS...FLOWERING FRUIT TREES AND OTHER SENSITIVE VEGETATION 
  WILL SUFFER DAMAGE IF NOT PROTECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

A FREEZE WATCH MEANS SUB-FREEZING TEMPERATURES ARE POSSIBLE.
THESE CONDITIONS COULD KILL CROPS AND OTHER SENSITIVE VEGETATION.

&&

$$

NJZ009-010-292000-
/O.NEW.KPHI.FZ.A.0006.120430T0600Z-120430T1200Z/
HUNTERDON-SOMERSET-
INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE
400 AM EDT SUN APR 29 2012

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FREEZE
WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
MORNING.

* TEMPERATURES...UPPER 20S TO LOW 30S MONDAY MORNING.

* IMPACTS...FLOWERING FRUIT TREES AND OTHER SENSITIVE VEGETATION 
  WILL SUFFER DAMAGE IF NOT PROTECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZE WATCH MEANS SUB-FREEZING TEMPERATURES ARE POSSIBLE.
THESE CONDITIONS COULD KILL CROPS AND OTHER SENSITIVE VEGETATION.

&&

$$
1 follow-up statement
956 
WWUS71 KPHI 291343
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
943 AM EDT SUN APR 29 2012

NJZ001-007>010-PAZ054-055-060>062-292000-
/O.UPG.KPHI.FZ.A.0006.120430T0600Z-120430T1200Z/
/O.NEW.KPHI.FZ.W.0011.120430T0600Z-120430T1200Z/
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-CARBON-MONROE-BERKS-
LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
FLEMINGTON...SOMERVILLE...JIM THORPE...STROUDSBURG...READING...
ALLENTOWN...BETHLEHEM...EASTON
943 AM EDT SUN APR 29 2012

...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT MONDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FREEZE
WARNING, WHICH IS IN EFFECT FROM 2 AM TO 8 AM EDT MONDAY. THE
FREEZE WATCH IS NO LONGER IN EFFECT.

* LOW TEMPERATURES...IN THE MID 20S TO LOW 30S MONDAY MORNING.

* IMPACTS...FLOWERING FRUIT TREES AND OTHER SENSITIVE VEGETATION 
  WILL SUFFER DAMAGE IF NOT PROTECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR
HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER
SENSITIVE VEGETATION.

&&

$$

DEZ001-MDZ008-NJZ012-013-015>023-027-PAZ067>070-292000-
/O.NEW.KPHI.FR.Y.0008.120430T0600Z-120430T1200Z/
NEW CASTLE-CECIL-MIDDLESEX-WESTERN MONMOUTH-MERCER-SALEM-
GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-
ATLANTIC-CAPE MAY-SOUTHEASTERN BURLINGTON-CHESTER-MONTGOMERY-
BUCKS-DELAWARE-
INCLUDING THE CITIES OF...WILMINGTON...ELKTON...NEW BRUNSWICK...
FREEHOLD...TRENTON...PENNSVILLE...GLASSBORO...CAMDEN...
CHERRY HILL...MOORESTOWN...MOUNT HOLLY...JACKSON...MILLVILLE...
HAMMONTON...CAPE MAY COURT HOUSE...WHARTON STATE FOREST...
WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA
943 AM EDT SUN APR 29 2012

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FROST
ADVISORY, WHICH IS IN EFFECT FROM 2 AM TO 8 AM EDT MONDAY.

* LOW TEMPERATURES...IN THE MID TO UPPER 30S MONDAY MORNING.

* IMPACTS...FLOWERING FRUIT TREES AND OTHER SENSITIVE VEGETATION 
  WILL SUFFER DAMAGE IF NOT PROTECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

RPW

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 9:43 AM EDTFrost AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more22 hr
Apr 29, 9:43 AM EDTFreeze WarningPHIAtlantic, Burlington, Cumberland, Hunterdon, Morris, Ocean and 3 more22 hr

Nearby

Freeze Watches in New Jersey, 2012Freeze Watches in Pennsylvania, 2012Every freeze watch in 2012

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.