Alert archive / Pennsylvania / Winter Storm Watches in 2011

Winter Storm Watch 6, NWS Philadelphia/Mount Holly

March 22, 2011Morris County, Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this winter storm watch at Mar 22, 2011, 3:48 AM EDT for Morris County, Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania. It took effect at Mar 23, 2011, 2:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Mar 22, 2011, 3:48 AM EDT (07:48 UTC)
In effect from
Mar 23, 2011, 2:00 AM EDT
Expired
Mar 22, 2011, 3:35 PM EDT
In force
Issued by
NWS Philadelphia/Mount Holly

Counties Morris 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), 122 km from the middle of the area, began a volume at 07:49 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, 7.8 hours before the alert went out and 202 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 2011-03-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 2011-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
452 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
198 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.

888 
WWUS41 KPHI 220748
WSWPHI

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
348 AM EDT TUE MAR 22 2011

NJZ001-007-008-PAZ054-055-060>062-222100-
/O.NEW.KPHI.WS.A.0006.110323T0600Z-110324T0800Z/
SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON
348 AM EDT TUE MAR 22 2011

...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH LATE
WEDNESDAY NIGHT...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
STORM WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH LATE
WEDNESDAY NIGHT. 

* LOCATIONS...THE LEHIGH VALLEY AND SOUTHERN POCONOS IN EASTERN
  PENNSYLVANIA AND NORTHWEST NEW JERSEY.

* HAZARD TYPES...MAINLY SNOW. SOME SLEET OR FREEZING RAIN COULD
  MIX WITH THE SNOW WEDNESDAY AFTERNOON AND EVENING.

* ACCUMULATIONS...4 TO 8 INCHES OF SNOW.

* TIMING...THE SNOW WILL BEGIN DURING THE EARLY MORNING HOURS OF
  WEDNESDAY. THE SNOW WILL FALL WITH VARYING INTENSITY DURING
  WEDNESDAY INTO WEDNESDAY EVENING. THE SNOW SHOULD TAPER OFF LATE
  WEDNESDAY NIGHT OR EARLY THURSDAY MORNING.

* IMPACTS...THE WEDNESDAY MORNING COMMUTE WILL BE AFFECTED AS SNOW
  WILL BE FALLING AND UNTREATED ROADS WILL BE SLICK AND SNOW
  COVERED. THE WEDNESDAY EVENING COMMUTE COULD BE AFFECTED MORE
  SIGNIFICANTLY AS SNOW ACCUMULATIONS COULD REACH NEAR 6 INCHES
  IN PLACES BY WEDNESDAY EVENING.

* WINDS...NORTHEAST 5 TO 10 MPH.

* TEMPERATURES...IN THE LOWER 30S.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.

&&

$$

HAYES
2 follow-up statements
886 
WWUS41 KPHI 221016
WSWPHI

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
616 AM EDT TUE MAR 22 2011

NJZ001-007-008-PAZ054-055-060>062-222100-
/O.CON.KPHI.WS.A.0006.110323T0600Z-110324T0800Z/
SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON
616 AM EDT TUE MAR 22 2011

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
LATE WEDNESDAY NIGHT...

A WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
LATE WEDNESDAY NIGHT. 

* LOCATIONS...THE LEHIGH VALLEY AND SOUTHERN POCONOS IN EASTERN 
  PENNSYLVANIA AND NORTHWEST NEW JERSEY. 

* HAZARD TYPES...MAINLY SNOW. SOME SLEET OR FREEZING RAIN COULD 
  MIX WITH THE SNOW WEDNESDAY AFTERNOON AND EVENING. 

* ACCUMULATIONS...4 TO 8 INCHES OF SNOW.

* TIMING...THE SNOW WILL BEGIN DURING THE EARLY MORNING HOURS OF 
  WEDNESDAY. THE SNOW WILL FALL WITH VARYING INTENSITY DURING 
  WEDNESDAY INTO WEDNESDAY EVENING. THE SNOW SHOULD TAPER OFF 
  LATE WEDNESDAY NIGHT OR EARLY THURSDAY MORNING. 

* IMPACTS...THE WEDNESDAY MORNING COMMUTE WILL BE AFFECTED AS 
  SNOW WILL BE FALLING AND UNTREATED ROADS WILL BE SLICK AND 
  SNOW COVERED. THE WEDNESDAY EVENING COMMUTE COULD BE AFFECTED 
  MORE SIGNIFICANTLY AS SNOW ACCUMULATIONS COULD REACH NEAR 6 
  INCHES IN PLACES BY WEDNESDAY EVENING. 

* WINDS...NORTHEAST 5 TO 10 MPH.

* TEMPERATURES...IN THE LOWER 30S.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.

&&

$$
526 
WWUS41 KPHI 221935
WSWPHI

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
335 PM EDT TUE MAR 22 2011

NJZ001-PAZ054-055-231000-
/O.UPG.KPHI.WS.A.0006.110323T0600Z-110324T0800Z/
/O.NEW.KPHI.WS.W.0008.110323T0600Z-110324T1000Z/
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
335 PM EDT TUE MAR 22 2011

...WINTER STORM WARNING IN EFFECT FROM 2 AM WEDNESDAY TO 6 AM EDT
THURSDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
STORM WARNING...WHICH IS IN EFFECT FROM 2 AM WEDNESDAY TO 6 AM
EDT THURSDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* LOCATIONS...CARBON AND MONROE COUNTIES IN PENNSYLVANIA AND
  SUSSEX COUNTY IN NEW JERSEY.

* HAZARD TYPES...MAINLY SNOW WITH SLEET MIXING IN AT TIMES.

* ACCUMULATIONS...4 TO 10 INCHES OF SNOW.

* TIMING...SNOW IS EXPECTED TO BEGIN OVERNIGHT TONIGHT INTO EARLY
  WEDNESDAY MORNING AND CONTINUE THROUGH WEDNESDAY NIGHT, BEFORE
  TAPERING OFF THURSDAY MORNING. SLEET MAY PERIODICALLY MIX WITH
  SNOW, ESPECIALLY DURING THE DAY WEDNESDAY.

* IMPACTS...THE WEDNESDAY MORNING COMMUTE IS EXPECTED TO BE
  AFFECTED BY SNOW AND POSSIBLY SLEET. SNOW AND SLEET
  ACCUMULATIONS WILL INCREASE THROUGH THE DAY AND INTO THE EVENING
  COMMUTE, WITH TOTALS REACHING BETWEEN 4 AND 10 INCHES. THE
  GREATEST IMPACTS WILL BE IN THE HIGHEST ELEVATIONS, AS WELL AS
  UNTREATED AND SECONDARY ROADS.

* WINDS...NORTHEAST 5 TO 10 MPH.

* TEMPERATURES...AROUND 30.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO
POSSIBLE.  THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$

NJZ007-008-PAZ061-062-231000-
/O.UPG.KPHI.WS.A.0006.110323T0600Z-110324T0800Z/
/O.NEW.KPHI.WW.Y.0017.110323T0600Z-110324T1000Z/
WARREN-MORRIS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...WASHINGTON...MORRISTOWN...ALLENTOWN...
BETHLEHEM...EASTON
335 PM EDT TUE MAR 22 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM WEDNESDAY TO 6 AM
EDT THURSDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY...WHICH IS IN EFFECT FROM 2 AM WEDNESDAY TO 6 AM
EDT THURSDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* LOCATIONS...WARREN AND MORRIS COUNTIES IN NEW JERSEY, AND LEHIGH
  AND NORTHAMPTON COUNTIES IN PENNSYLVANIA.

* HAZARD TYPES...SNOW AND SLEET.

* ACCUMULATIONS...3 TO 7 INCHES OF SNOW AND SLEET.

* TIMING...PRECIPITATION IS EXPECTED TO BEGIN OVERNIGHT TONIGHT
  INTO EARLY WEDNESDAY MORNING AND CONTINUE THROUGH WEDNESDAY
  NIGHT, BEFORE TAPERING OFF THURSDAY MORNING. PRECIPITATION IS
  EXPECTED TO BEGIN AS RAIN OR A RAIN AND SNOW MIXTURE, BEFORE
  CHANGING TO SNOW, OR A SNOW AND SLEET MIXTURE DURING THE DAY
  WEDNESDAY.

* IMPACTS...THE WEDNESDAY MORNING COMMUTE IS EXPECTED TO BE
  AFFECTED BY A WINTRY MIXTURE OF RAIN AND SNOW. PRECIPITATION
  WILL CHANGE TO SNOW AT TIMES WHEN THE PRECIPITATION BECOMES
  HEAVIER. THE SNOW AND SLEET MAY HAVE A DIFFICULT TIME
  ACCUMULATING IN THE MIDDLE OF THE DAY WEDNESDAY. SNOW AND SLEET
  ACCUMULATIONS WILL INCREASE AGAIN TOWARD THE EVENING COMMUTE,
  WITH TOTALS REACHING BETWEEN 3 AND 7 INCHES. THE GREATEST
  IMPACTS WILL BE IN THE HIGHEST ELEVATIONS, AS WELL AS UNTREATED
  AND SECONDARY ROADS.

* WINDS...NORTHEAST 5 TO 10 MPH.

* TEMPERATURES...IN THE LOWER TO MID 30S.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

PAZ060-231000-
/O.UPG.KPHI.WS.A.0006.110323T0600Z-110324T0800Z/
/O.NEW.KPHI.WW.Y.0017.110323T0600Z-110323T1500Z/
BERKS-
INCLUDING THE CITY OF...READING
335 PM EDT TUE MAR 22 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM TO 11 AM EDT
WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 11 AM EDT
WEDNESDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* LOCATIONS...BERKS COUNTY IN PENNSYLVANIA

* HAZARD TYPES...SNOW AND SLEET

* ACCUMULATIONS...1 TO 3 INCHES OF SNOW AND SLEET THROUGH THE
  MORNING COMMUTE.

* TIMING...PRECIPITATION IS EXPECTED TO BEGIN OVERNIGHT TONIGHT
  INTO EARLY WEDNESDAY MORNING AND CONTINUE THROUGH WEDNESDAY
  NIGHT, BEFORE TAPERING OFF THURSDAY MORNING. PRECIPITATION IS
  EXPECTED TO BEGIN AS RAIN, OR A RAIN AND SNOW MIXTURE, BEFORE
  CHANGING TO SNOW AND SLEET DURING THE MORNING COMMUTE HOURS.
  PRECIPITATION MAY CHANGE BACK TO RAIN DURING THE DAY WEDNESDAY.

* IMPACTS...THE WEDNESDAY MORNING COMMUTE IS EXPECTED TO BE
  AFFECTED BY A WINTRY MIXTURE OF RAIN AND SNOW. PRECIPITATION IS
  EXPECTED TO CHANGE TO RAIN DURING THE DAY WEDNESDAY. THE
  GREATEST IMPACTS WILL BE IN THE HIGHEST ELEVATIONS, AS WELL AS
  UNTREATED AND SECONDARY ROADS.

* WINDS...NORTHEAST 5 TO 10 MPH.

* TEMPERATURES...IN THE MID 30S.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

NJZ009-010-PAZ069-231000-
/O.NEW.KPHI.WW.Y.0017.110323T0600Z-110323T1500Z/
HUNTERDON-SOMERSET-BUCKS-
INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE...DOYLESTOWN
335 PM EDT TUE MAR 22 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM TO 11 AM EDT
WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 11 AM EDT
WEDNESDAY.

* LOCATIONS...HUNTERDON AND SOMERSET COUNTIES IN NEW JERSEY AND
  BUCKS COUNTY IN PENNSYLVANIA.

* HAZARD TYPES...SNOW AND SLEET

* ACCUMULATIONS...1 TO 3 INCHES OF SNOW.

* TIMING...PRECIPITATION IS EXPECTED TO BEGIN OVERNIGHT TONIGHT
  INTO EARLY WEDNESDAY MORNING AND CONTINUE THROUGH WEDNESDAY
  NIGHT, BEFORE TAPERING OFF THURSDAY MORNING. PRECIPITATION IS
  EXPECTED TO BEGIN AS RAIN, OR A RAIN AND SNOW MIXTURE, BEFORE
  CHANGING TO SNOW AND SLEET DURING THE MORNING COMMUTE HOURS.
  PRECIPITATION MAY CHANGE BACK TO RAIN DURING THE DAY WEDNESDAY.

* IMPACTS...THE WEDNESDAY MORNING COMMUTE IS EXPECTED TO BE
  AFFECTED BY A WINTRY MIXTURE OF RAIN AND SNOW. PRECIPITATION IS
  EXPECTED TO CHANGE TO RAIN DURING THE DAY WEDNESDAY. THE
  GREATEST IMPACTS WILL BE IN THE HIGHEST ELEVATIONS IN THE
  NORTHERN PORTIONS OF THE COUNTIES, AS WELL AS UNTREATED AND
  SECONDARY ROADS.

* WINDS...NORTHEAST UP TO 5 MPH.

* TEMPERATURES...IN THE MID 30S.

* VISIBILITIES...ONE QUARTER TO ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

ROBERTSON/TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 22, 3:35 PM EDTWinter Storm WarningPHIMorris, Sussex, Warren36 hr
Mar 22, 3:35 PM EDTWinter Weather AdvisoryPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Warren19 hr

Nearby

Winter Storm Watches in Pennsylvania, 2011Winter Storm Watches in New Jersey, 2011Every winter storm watch in 2011

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.