Alert archive / Pennsylvania / Winter Storm Watches in 2007
Winter Storm Watch 7, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter storm watch at Dec 14, 2007, 4:01 PM EST for 5 counties in Pennsylvania; 5 counties in New Jersey. It took effect at Dec 15, 2007, 7:00 PM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 14, 2007, 4:01 PM EST (21:01 UTC)
- In effect from
- Dec 15, 2007, 7:00 PM EST
- Expired
- Dec 15, 2007, 3:40 PM EST
- 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 21:06 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.0 hours before the alert went out and 166 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS41 KPHI 142101 WSWPHI URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 401 PM EST FRI DEC 14 2007 NJZ001-007-008-PAZ054-055-060>062-151000- /O.NEW.KPHI.WS.A.0007.071216T0000Z-071217T0000Z/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM... EASTON 401 PM EST FRI DEC 14 2007 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY EVENING THROUGH SUNDAY EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM SATURDAY EVENING THROUGH SUNDAY EVENING. LOW PRESSURE FORECAST TO DEVELOP OVER THE LOWER MISSISSIPPI RIVER VALLEY ON SATURDAY IS EXPECTED TO MOVE TO THE NORTHEAST WITH A SECONDARY LOW DEVELOPING OVER THE CAROLINAS SATURDAY NIGHT. THE SECONDARY LOW WILL INTENSIFY AS IT MOVES TO THE NORTHEAST, PASSING OVER OUR REGION ON SUNDAY BEFORE MOVING UP OVER THE COASTAL WATERS OF NEW ENGLAND AND CANADAS MARITIME PROVINCES ON SUNDAY NIGHT. SNOW ASSOCIATED WITH THIS SYSTEM WILL BEGIN TO SPREAD INTO OUR AREA DURING THE EVENING SATURDAY. DURING THE EARLY MORNING HOURS, WARMER AIR MOVING IN ALOFT WILL CAUSE THE SNOW TO MIX WITH OR CHANGE TO SLEET AND FREEZING RAIN. TEMPERATURES WILL RISE VERY SLOWLY UNTIL AROUND MIDDAY SUNDAY WHEN COLDER AIR BEGINS TO WORK BACK INTO THE AREA. THE SLEET AND FREEZING RAIN WILL CONTINUE INTO SUNDAY MORNING, POSSIBLY EVEN CHANGING TO ALL RAIN IN SOME OF THE MILDER LOCATIONS WHERE TEMPERATURES ARE ABLE TO CLIMB ABOVE FREEZING. SNOW ACCUMULATIONS IN MOST AREAS ARE EXPECTED TO BE AROUND 2 INCHES, BUT MAY REACH 4 TO 6 INCHES IN THE HIGHER ELEVATIONS OF THE POCONOS AND EXTREME NORTHWEST NEW JERSEY. ONCE THE SNOW AND SLEET CHANGE OVER TO FREEZING RAIN, ICE MAY ACCUMULATE 1/4 TO 1/2 INCH. AS THE COLDER AIR BEGINS TO MOVE BACK IN, THE PRECIPITATION IS EXPECTED TO CHANGE BACK TO SNOW IN THE AFTERNOON BEFORE TAPERING OFF TO SNOW SHOWERS AND FLURRIES IN THE EVENING. AN ADDITIONAL INCH OR TWO OF SNOW IS POSSIBLE ONCE THE CHANGE BACK TO SNOW OCCURS. 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. $$ NJZ009-010-PAZ067>069-151000- /O.NEW.KPHI.WS.A.0007.071216T0000Z-071216T1200Z/ HUNTERDON-SOMERSET-CHESTER-MONTGOMERY-BUCKS- INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE... WEST CHESTER...NORRISTOWN...DOYLESTOWN 401 PM EST FRI DEC 14 2007 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY EVENING THROUGH SUNDAY MORNING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM SATURDAY EVENING THROUGH SUNDAY MORNING. LOW PRESSURE FORECAST TO DEVELOP OVER THE LOWER MISSISSIPPI RIVER VALLEY ON SATURDAY IS EXPECTED TO MOVE TO THE NORTHEAST WITH A SECONDARY LOW DEVELOPING OVER THE CAROLINAS SATURDAY NIGHT. THE SECONDARY LOW WILL INTENSIFY AS IT MOVES TO THE NORTHEAST, PASSING OVER OUR REGION ON SUNDAY BEFORE MOVING UP OVER THE COASTAL WATERS OF NEW ENGLAND AND CANADAS MARITIME PROVINCES ON SUNDAY NIGHT. SNOW ASSOCIATED WITH THIS SYSTEM WILL BEGIN TO SPREAD INTO OUR AREA DURING THE EVENING SATURDAY. BY MIDNIGHT, WARMER AIR MOVING IN ALOFT WILL CAUSE THE SNOW TO MIX WITH OR CHANGE TO SLEET AND FREEZING RAIN. TEMPERATURES WILL CONTINUE TO RISE THROUGH THE NIGHT AND INTO MIDDAY SUNDAY ALLOWING THE SLEET AND FREEZING RAIN TO CHANGE TO ALL RAIN BY OR AROUND DAYBREAK. A SMALL ACCUMULATION OF SNOW AND SLEET, POSSIBLY UP TO AN INCH, MAY OCCUR BEFORE THE CHANGE OVER TO FREEZING RAIN. ONCE THE CHANGE OVER OCCURS, ICE MAY ACCUMULATE UP TO 1/4 INCH. COLDER AIR WILL BEGIN TO WORK BACK INTO THE AREA SUNDAY AFTERNOON ALLOWING THE PRECIPITATION TO CHANGE BACK TO SNOW BEFORE TAPERING OFF TO SNOW SHOWERS AND FLURRIES BY EVENING. A DUSTING UP TO AN INCH OF ADDITIONAL SNOW IS POSSIBLE ONCE THE CHANGE BACK TO SNOW OCCURS. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$ RPW
2 follow-up statements
000 WWUS41 KPHI 151000 WSWPHI URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 500 AM EST SAT DEC 15 2007 NJZ001-007-008-PAZ054-055-060>062-152100- /O.CON.KPHI.WS.A.0007.071216T0000Z-071217T0000Z/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM... EASTON 500 AM EST SAT DEC 15 2007 ...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH SUNDAY EVENING... A WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH SUNDAY EVENING. LOW PRESSURE IS FORECAST TO MOVE TO TENNESSEE TODAY AND TO OHIO TONIGHT. A SECONDARY LOW PRESSURE AREA WILL FORM OVER SOUTHEAST VIRGINIA AND INTENSIFY AS IT MOVES TO THE NORTHEAST... PASSING OVER OUR REGION ON SUNDAY BEFORE MOVING TO THE COASTAL WATERS OF NEW ENGLAND ON SUNDAY NIGHT. SNOW AND SLEET ASSOCIATED WITH THIS SYSTEM WILL OVERSPREAD THE REGION THIS EVENING THEN CHANGE TO ALL SLEET BEFORE EVENTUALLY CHANGING TO FREEZING RAIN MIXED WITH SLEET LATE TONIGHT. THE FREEZING RAIN AND SLEET SHOULD CHANGE TO RAIN OVER MOST AREAS TOMORROW MORNING, BUT THE HIGHER ELEVATIONS COULD REMAIN AS FREEZING RAIN. THE SNOW AND SLEET ARE EXPECTED TO ACCUMULATE 1 TO 3 INCHES WITH 4 INCHES POSSIBLE IN THE POCONOS AND NORTHWEST NEW JERSEY. ICE MAY ACCUMULATE 1/4 TO 1/2 INCH. AS THE COLDER AIR MOVES BACK IN LATE TOMORROW AFTERNOON...THE PRECIPITATION IS EXPECTED TO CHANGE TO SNOW SHOWERS BEFORE TAPERING OFF TO FLURRIES. AN INCH OF SNOW IS POSSIBLE FROM THE SNOW SHOWERS. WINDS WILL INCREASE SUNDAY NIGHT AND GUSTS TO 45 MPH ARE POSSIBLE FROM THE CIRCULATION ON THE BACKSIDE OF THE DEPARTING LOW. 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. $$ NJZ009-010-PAZ067>069-152100- /O.CON.KPHI.WS.A.0007.071216T0000Z-071216T1200Z/ HUNTERDON-SOMERSET-CHESTER-MONTGOMERY-BUCKS- INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE... WEST CHESTER...NORRISTOWN...DOYLESTOWN 500 AM EST SAT DEC 15 2007 ...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH SUNDAY MORNING... A WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH SUNDAY MORNING. LOW PRESSURE IS FORECAST TO MOVE TO TENNESSEE TODAY AND TO OHIO TONIGHT. A SECONDARY LOW PRESSURE AREA WILL FORM OVER SOUTHEAST VIRGINIA AND INTENSIFY AS IT MOVES TO THE NORTHEAST... PASSING OVER OUR REGION ON SUNDAY BEFORE MOVING TO THE COASTAL WATERS OF NEW ENGLAND ON SUNDAY NIGHT. SNOW AND SLEET ASSOCIATED WITH THIS SYSTEM WILL OVERSPREAD THE REGION THIS EVENING THEN CHANGE TO ALL SLEET BEFORE EVENTUALLY CHANGING TO FREEZING RAIN MIXED WITH SLEET LATE TONIGHT. THE FREEZING RAIN AND SLEET IS FORECAST TO CHANGE TO RAIN TOMORROW MORNING. THE SNOW AND SLEET ARE EXPECTED TO ACCUMULATE AROUND AN INCH. ICE MAY ACCUMULATE UP TO 1/4 INCH. AS THE COLDER AIR BEGINS TO MOVE BACK IN TOMORROW AFTERNOON... THE PRECIPITATION IS EXPECTED TO TAPER OFF TO RAIN SHOWERS BEFORE CHANGING TO SCATTERED FLURRIES IN THE EVENING. WINDS WILL INCREASE SUNDAY NIGHT AND GUSTS TO 45 MPH ARE POSSIBLE FROM THE CIRCULATION ON THE BACKSIDE OF THE DEPARTING LOW. A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. $$ STAUBER
000 WWUS41 KPHI 152040 WSWPHI URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 340 PM EST SAT DEC 15 2007 NJZ001-PAZ054-055-161000- /O.UPG.KPHI.WS.A.0007.071216T0000Z-071217T0000Z/ /O.NEW.KPHI.WS.W.0006.071216T0300Z-071216T2100Z/ SUSSEX-CARBON-MONROE- INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG 340 PM EST SAT DEC 15 2007 ...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO 4 PM EST SUNDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER STORM WARNING...WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO 4 PM EST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. LOW PRESSURE MOVING NORTHEAST FROM THE LOWER MISSISSIPPI VALLEY WILL REACH EASTERN OHIO LATE TONIGHT AS A SECONDARY LOW PRESSURE AREA BEGINS TO FORM OVER THE MIDDLE ATLANTIC COASTAL ZONE. THIS LOW WILL INTENSIFY AS IT CROSSES OUR REGION ON SUNDAY BEFORE MOVING TO COASTAL NEW ENGLAND SUNDAY NIGHT. SNOW ASSOCIATED WITH THIS SYSTEM WILL OVERSPREAD THE REGION THIS EVENING THEN MIX WITH AND CHANGE TO SLEET BEFORE EVENTUALLY CHANGING TO FREEZING RAIN MIXED WITH SLEET LATE TONIGHT. THE FREEZING RAIN AND SLEET SHOULD CHANGE TO RAIN OVER MOST AREAS SUNDAY MORNING...WITH THE POSSIBLE EXCEPTION OF THE HIGHER ELEVATIONS WHERE TEMPERATURES COULD REMAIN AT OR SLIGHTLY BELOW FREEZING. THE SNOW AND SLEET ARE EXPECTED TO ACCUMULATE 3 TO 5 INCHES BEFORE THE CHANGE OVER TO FREEZING RAIN. ICE MAY ACCUMULATE 1/4 TO 1/2 INCH. AS THE COLDER AIR MOVES BACK IN LATE SUNDAY AFTERNOON...THE PRECIPITATION IS EXPECTED TO CHANGE TO SNOW SHOWERS BEFORE TAPERING OFF TO FLURRIES. AN ADDITIONAL INCH OF SNOW IS POSSIBLE FROM THE SNOW SHOWERS. WINDS WILL INCREASE SUNDAY NIGHT AND GUSTS OF 45 TO 50 MPH ARE POSSIBLE FROM THE CIRCULATION ON THE BACKSIDE OF THE DEPARTING LOW. 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. $$ NJZ007-008-PAZ060>062-161000- /O.UPG.KPHI.WS.A.0007.071216T0000Z-071217T0000Z/ /O.NEW.KPHI.WW.Y.0017.071216T0300Z-071216T1600Z/ WARREN-MORRIS-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...WASHINGTON...MORRISTOWN...READING... ALLENTOWN...BETHLEHEM...EASTON 340 PM EST SAT DEC 15 2007 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 11 AM EST SUNDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER WEATHER ADVISORY...WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO 11 AM EST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. LOW PRESSURE MOVING NORTHEAST FROM THE LOWER MISSISSIPPI VALLEY WILL REACH EASTERN OHIO LATE TONIGHT AS A SECONDARY LOW PRESSURE AREA BEGINS TO FORM OVER THE MIDDLE ATLANTIC COASTAL ZONE. THIS LOW WILL INTENSIFY AS IT CROSSES OUR REGION ON SUNDAY BEFORE MOVING TO COASTAL NEW ENGLAND SUNDAY NIGHT. SNOW ASSOCIATED WITH THIS SYSTEM WILL OVERSPREAD THE REGION THIS EVENING THEN MIX WITH AND CHANGE TO SLEET BEFORE EVENTUALLY CHANGING TO FREEZING RAIN AND SLEET LATE TONIGHT. THE FREEZING RAIN AND SLEET WILL THEN CHANGE TO RAIN OVER MOST AREAS SUNDAY MORNING. THE SNOW AND SLEET ARE EXPECTED TO ACCUMULATE 1 TO 3 INCHES BEFORE CHANGING TO FREEZING RAIN. ICE MAY ACCUMULATE UP TO 1/4 INCH. AS THE COLDER AIR MOVES BACK IN LATE TOMORROW AFTERNOON...THE PRECIPITATION IS EXPECTED TO CHANGE TO SNOW SHOWERS BEFORE TAPERING OFF TO FLURRIES. UP TO AN INCH OF ADDITIONAL SNOW IS POSSIBLE FROM THE SNOW SHOWERS. WINDS WILL INCREASE SUNDAY NIGHT AND GUSTS OF 45 TO 50 MPH ARE POSSIBLE FROM THE CIRCULATION ON THE BACKSIDE OF THE DEPARTING LOW. A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. $$ NJZ009-010-PAZ067>069-161000- /O.UPG.KPHI.WS.A.0007.071216T0000Z-071216T1200Z/ /O.NEW.KPHI.WW.Y.0017.071216T0300Z-071216T1200Z/ HUNTERDON-SOMERSET-CHESTER-MONTGOMERY-BUCKS- INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE... WEST CHESTER...NORRISTOWN...DOYLESTOWN 340 PM EST SAT DEC 15 2007 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 7 AM EST SUNDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER WEATHER ADVISORY...WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO 7 AM EST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. LOW PRESSURE MOVING NORTHEAST FROM THE LOWER MISSISSIPPI VALLEY WILL REACH EASTERN OHIO LATE TONIGHT AS A SECONDARY LOW PRESSURE AREA BEGINS TO FORM OVER THE MIDDLE ATLANTIC COASTAL ZONE. THIS LOW WILL INTENSIFY AS IT CROSSES OUR REGION ON SUNDAY BEFORE MOVING TO COASTAL NEW ENGLAND SUNDAY NIGHT. SNOW ASSOCIATED WITH THIS SYSTEM WILL OVERSPREAD THE REGION THIS EVENING THEN QUICKLY MIX WITH AND CHANGE TO SLEET BEFORE EVENTUALLY CHANGING TO FREEZING RAIN AND SLEET AFTER MIDNIGHT. THE FREEZING RAIN AND SLEET WILL THEN CHANGE TO RAIN OVER MOST AREAS BY OR SHORTLY AFTER DAYBREAK. THE SNOW AND SLEET ARE EXPECTED TO ACCUMULATE AROUND AN INCH. ICE MAY ACCUMULATE TO AROUND 1/10 INCH. AS THE COLDER AIR BEGINS TO MOVE BACK IN TOMORROW AFTERNOON... THE PRECIPITATION IS EXPECTED TO TAPER OFF TO RAIN SHOWERS BEFORE CHANGING TO SCATTERED FLURRIES IN THE EVENING. WINDS WILL INCREASE SUNDAY NIGHT AND GUSTS OF 45 TO 50 MPH ARE POSSIBLE FROM THE CIRCULATION ON THE BACKSIDE OF THE DEPARTING LOW. 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. $$ RPW
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 14, 3:38 PM EST | Coastal Flood Watch | PHI | Middlesex, Monmouth, Ocean | 24 hr |
Nearby
Winter Storm Watches in Pennsylvania, 2007Winter Storm Watches in New Jersey, 2007Every winter storm watch in 2007
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.