Alert archive / Pennsylvania / Winter Storm Watches in 2007
Winter Storm Watch 6, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter storm watch at Dec 12, 2007, 3:51 AM EST for 5 counties in Pennsylvania; Morris County, Sussex County, Warren County, New Jersey. It took effect at Dec 13, 2007, 10:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 12, 2007, 3:51 AM EST (08:51 UTC)
- In effect from
- Dec 13, 2007, 10:00 AM EST
- Expired
- Dec 12, 2007, 4:25 PM EST
- 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 08:53 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, 8.9 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 554 m²/s²
- 0-3 km storm-relative helicity
- 805 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 120851 WSWPHI URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 351 AM EST WED DEC 12 2007 NJZ001-007-008-PAZ054-055-060>062-122200- /O.NEW.KPHI.WS.A.0006.071213T1500Z-071214T0600Z/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM... EASTON 351 AM EST WED DEC 12 2007 ...WINTER STORM WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE THURSDAY NIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM THURSDAY MORNING THROUGH LATE THURSDAY NIGHT. AN AREA OF LOW PRESSURE WILL MOVE EASTWARD FROM THE OHIO VALLEY AND CROSS THE REGION THURSDAY INTO THURSDAY NIGHT BEFORE MOVING OUT TO SEA. LOW TEMPERATURES THURSDAY MORNING WILL BE AT OR BELOW FREEZING ACROSS THE WATCH AREA. TEMPERATURES WILL STRUGGLE TO REACH THE FREEZING MARK DURING THE DAY ON THURSDAY. AS A RESULT, ANY PRECIPITATION THAT FALLS WILL PREDOMINANTLY BE IN THE FORM OF SNOW, WITH SOME SLEET OR FREEZING RAIN MIXING IN OVER THE WATCH AREA. THERE IS STILL SOME UNCERTAINTY AS TO THE EXACT TRACK AND SPEED OF THIS SYSTEM. HOWEVER, THE SYSTEM IS FORECAST TO MOVE RELATIVELY QUICKLY. SNOWFALL ACCUMULATIONS OF UP TO 6 INCHES ARE POSSIBLE ACROSS THE WATCH AREA BY THURSDAY NIGHT. NEVERTHELESS, IT IS IMPORTANT TO NOTE THAT A SLIGHTLY FASTER OR SLOWER SPEED OR A CHANGE IN TEMPERATURE BY EVEN 1 OR 2 DEGREES CAN GREATLY AFFECT ACCUMULATIONS. IF THE STORM MOVES FASTER, THEN LESS PRECIPITATION WILL FALL. IF TEMPS ARE WARMER, THERE COULD BE MORE SLEET OR FREEZING RAIN, WHICH, WHILE KEEPING SNOW ACCUMULATIONS DOWN, PRESENT PROBLEMS OF THEIR OWN. RIGHT NOW, IT APPEARS THAT THE PRECIPITATION WILL HOLD OFF UNTIL AFTER MORNING RUSH HOUR ON THURSDAY. HOWEVER, THE STORM WILL BE BEARING DOWN ON THE WATCH AREA BY THURSDAY AFTERNOON. 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 AND LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR FURTHER UPDATES. $$ NIERENBERG
1 follow-up statement
000 WWUS41 KPHI 122125 WSWPHI URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 425 PM EST WED DEC 12 2007 ...A WINTER STORM TO AFFECT THE REGION DURING THURSDAY... .AN AREA OF LOW PRESSURE WILL ORGANIZE ACROSS THE SOUTHERN PLAINS AND MOVE INTO THE OHIO VALLEY TONIGHT. THIS STORM WILL THEN MOVE ACROSS OUR REGION DURING THURSDAY, BRINGING WITH IT A ROUND OF WINTRY PRECIPITATION. THIS STORM IS EXPECTED TO BRING A SIGNIFICANT AMOUNT OF SNOW AND EVEN SLEET TO A GOOD PORTION OF EASTERN PENNSYLVANIA AND INTO NORTHWESTERN NEW JERSEY, WITH LESSER AMOUNTS FARTHER TO THE SOUTH AND EAST. THE STORM WILL THEN COME TO AN END DURING THURSDAY EVENING. NJZ001-PAZ054-055-131000- /O.UPG.KPHI.WS.A.0006.071213T1500Z-071214T0600Z/ /O.NEW.KPHI.WS.W.0005.071213T1400Z-071214T0400Z/ SUSSEX-CARBON-MONROE- INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG 425 PM EST WED DEC 12 2007 ...WINTER STORM WARNING IN EFFECT FROM 9 AM TO 11 PM EST THURSDAY... ...WINTER STORM WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER STORM WARNING, WHICH IS IN EFFECT FROM 9 AM TO 11 PM EST THURSDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. SNOW IS EXPECTED TO OVERSPREAD THE AREA THURSDAY MORNING AND INCREASE IN INTENSITY AROUND MIDDAY THEN CONTINUE THROUGH THE AFTERNOON WITH SOME SLEET POSSIBLY MIXING IN. SNOWFALL RATES OF AN INCH PER HOUR WILL BE POSSIBLE MAINLY DURING THE AFTERNOON. A TOTAL SNOW ACCUMULATION OF 6 TO 10 INCHES ARE ANTICIPATED, WHICH WILL MAKE TRAVEL VERY HAZARDOUS. THE STEADIEST PRECIPITATION WILL BE TAPERING OFF DURING THURSDAY EVENING. A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW AND SLEET ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE. ANOTHER WINTER STORM MAY AFFECT THE AREA THIS WEEKEND. STAY TUNED TO NOAA WEATHER RADIO ALL HAZARDS OR YOUR LOCAL MEDIA OUTLETS FOR FURTHER UPDATES. $$ NJZ007-008-PAZ060>062-131000- /O.UPG.KPHI.WS.A.0006.071213T1500Z-071214T0600Z/ /O.NEW.KPHI.WS.W.0005.071213T1400Z-071214T0400Z/ WARREN-MORRIS-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...WASHINGTON...MORRISTOWN...READING... ALLENTOWN...BETHLEHEM...EASTON 425 PM EST WED DEC 12 2007 ...WINTER STORM WARNING IN EFFECT FROM 9 AM TO 11 PM EST THURSDAY... ...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 9 AM TO 11 PM EST THURSDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. A MIXTURE OF SNOW AND SLEET WILL OVERSPREAD THE REGION THURSDAY EVENING AND INCREASE IN INTENSITY AROUND MIDDAY AND CONTINUE THROUGH THE AFTERNOON. A TOTAL ACCUMULATION OF SNOW AND SLEET OF 5 TO AS MUCH AS 8 INCHES ARE ANTICIPATED, MAKING TRAVEL HAZARDOUS. THERE IS THE POSSIBILITY THAT A BIT OF FREEZING RAIN MAY MIX IN AT TIMES DURING THE AFTERNOON, HOWEVER SNOW AND SLEET ARE THE ANTICIPATED PREDOMINANT PRECIPITATION TYPES. THE STEADIEST PRECIPITATION WILL BE TAPERING OFF DURING THURSDAY EVENING. A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW, SLEET, AND ICE ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY HAZARDOUS. ANOTHER WINTER STORM MAY AFFECT THE AREA THIS WEEKEND. STAY TUNED TO NOAA WEATHER RADIO ALL HAZARDS OR YOUR LOCAL MEDIA OUTLETS FOR FURTHER UPDATES. $$ MDZ008-NJZ009-010-012-015-PAZ067>069-131000- /O.NEW.KPHI.WW.Y.0016.071213T1400Z-071214T0400Z/ CECIL-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CHESTER-MONTGOMERY- BUCKS- INCLUDING THE CITIES OF...ELKTON...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...TRENTON...WEST CHESTER...NORRISTOWN...DOYLESTOWN 425 PM EST WED DEC 12 2007 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM TO 11 PM EST THURSDAY... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER WEATHER ADVISORY, WHICH IS IN EFFECT FROM 9 AM TO 11 PM EST THURSDAY. A WINTRY MIX OF SNOW, SLEET AND FREEZING RAIN WILL OVERSPREAD THE REGION THURSDAY MORNING. AS MILDER AIR MOVES IN, LOCATIONS FARTHER SOUTH AND EAST WILL BEGIN TO CHANGE OVER TO PLAIN RAIN DURING THURSDAY AFTERNOON LIMITING ACCUMULATIONS, HOWEVER SLEET CAN STILL MIX IN. FOR LOCATIONS FARTHER NORTH AND WEST, A MORE PROLONGED PERIOD OF SLEET MIXED WITH FREEZING RAIN IS ANTICIPATED. A TOTAL ACCUMULATION OF SNOW AND SLEET RANGING FROM 2 TO AS MUCH AS 5 INCHES ARE ANTICIPATED ACROSS THE AREA, WITH THE HIGHEST AMOUNTS FOCUSED ACROSS THE NORTHERN AND WESTERN PORTIONS OF THE AFFECTED COUNTIES. ICE ACCUMULATIONS OF A TENTH OF AN INCH OR LESS ARE EXPECTED. THE STEADIEST PRECIPITATION WILL BE TAPERING OFF DURING THURSDAY EVENING. A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW, SLEET, OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES, AND USE CAUTION WHILE DRIVING. ANOTHER WINTER STORM MAY AFFECT THE AREA THIS WEEKEND. STAY TUNED TO NOAA WEATHER RADIO ALL HAZARDS OR YOUR LOCAL MEDIA OUTLETS FOR FURTHER UPDATES. $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 4:25 PM EST | Winter Storm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 27 hr |
| Dec 12, 4:25 PM EST | Winter Weather Advisory | PHI | 22 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.