Alert archive / New Jersey / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

February 11, 20128 counties in New Jersey; Delaware County, Philadelphia County, Pennsylvania; Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Feb 11, 2012, 6:16 PM EST for 8 counties in New Jersey; Delaware County, Philadelphia County, Pennsylvania; Kent County, Sussex County, Delaware. It was in force for 104 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Feb 11, 2012, 6:16 PM EST (23:16 UTC)
Expired
Feb 11, 2012, 8:00 PM EST
In force
104 min
Issued by
NWS Philadelphia/Mount Holly

Counties Kent County, DE, Sussex County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Ocean County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 23:16 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.3 hours before the alert went out and 162 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, Wallops Is Stn, VA at 12:00Z on 2012-02-11Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2012-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 square meters per square second.1939587897117136Sfc1 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
823 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
225 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.

337 
WWUS81 KPHI 112316
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
616 PM EST SAT FEB 11 2012

DEZ002>004-NJZ016>027-PAZ068-070-071-120100-
ATLANTIC NJ-ATLANTIC COASTAL CAPE MAY NJ-CAMDEN NJ-CAPE MAY NJ-
COASTAL ATLANTIC NJ-COASTAL OCEAN NJ-CUMBERLAND NJ-DELAWARE PA-
DELAWARE BEACHES DE-GLOUCESTER NJ-INLAND SUSSEX DE-KENT DE-
MONTGOMERY PA-NORTHWESTERN BURLINGTON NJ-OCEAN NJ-PHILADELPHIA PA-
SALEM NJ-SOUTHEASTERN BURLINGTON NJ-
616 PM EST SAT FEB 11 2012

...A LINE OF SNOW SHOWERS WITH POSSIBLY ISOLATED SNOW SQUALLS 
WILL AFFECT CAMDEN...MONTGOMERY...PHILADELPHIA...
DELAWARE...GLOUCESTER...KENT...SUSSEX...BURLINGTON...CAPE MAY...
ATLANTIC...OCEAN...SALEM AND CUMBERLAND COUNTIES...

AT 557 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SNOW SHOWERS ALONG A LINE EXTENDING FROM 7 MILES SOUTH OF READING TO 
7 MILES NORTHWEST OF WILMINGTON TO 19 MILES EAST OF EASTON. THIS
LINE IS MOVING SOUTHEAST AT 30 MPH. THE SNOW SHOWERS WILL AFFECT 
PENNSVILLE...WYOMING...WOODSIDE...VIOLA AROUND 615 PM...ELAM...
DOVER SPEEDWAY...PENNS GROVE...CARNEYS POINT AROUND 620 PM...
STOWE AND HOUSTON AROUND 625 PM.

THE HEAVIER SNOW SHOWERS WILL DROP VISIBILITIES TO LESS THAN ONE MILE
WITH ISOLATED AREAS POSSIBLY DROPPING TO AROUND A QUARTER OF A MILE 
IN SNOW SQUALLS. THE HIGHEST CHANCES FOR SQUALLS IS SOUTH OF 
PHILADELPHIA AND THE ATLANTIC CITY EXPRESSWAY IN NEW JERSEY.
 
THROUGH 8 PM THE HEAVIER SNOW SHOWERS COULD DROP A QUICK HALF AN 
INCH ON COOLER SURFACES. TEMPERATURES WILL DROP TO AROUND FREEZING 
DURING ANY HEAVIER SNOW BURSTS AND THEN FALL BELOW FREEZING AS THE 
EVENING PROGRESSES. WINDS WILL INCREASE WITH THE SNOW SHOWERS AND 
THEN PERSIST. WIND GUSTS OF 30 TO 40 MPH ARE COMMON IN THE LOWER 
SUSQUEHANNA VALLEY AND WEST OF CHESAPEAKE BAY. 

USE CAUTION IF YOU ARE TRAVELING IN THESE AREAS THIS 
EVENING. BE ALERT FOR VARYING VISIBILITIES AND ROAD CONDITIONS.
GIVE YOURSELF PLENTY OF DISTANCE BETWEEN YOURSELF AND THE VEHICLES 
AROUND YOU. WHEN TEMPERATURES DO FALL BELOW FREEZING LATER THIS 
EVENING ANY SLUSH OR STANDING WATER ON UNTREATED ROADWAYS WILL 
FREEZE AND MAKE FOR HAZARDOUS TRAVELING CONDITIONS.
 
LAT...LON 3851 7571 3930 7573 3932 7543 3907 7539
      3879 7515 3911 7490 3915 7490 3918 7515
      3946 7555 3979 7541 3987 7560 4007 7537
      4025 7569 4026 7568 3985 7413 3972 7415
      3983 7407 3945 7430 3892 7497 3844 7505

$$

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 11, 3:37 AM ESTGale WarningPHI45 hr
Feb 11, 3:19 PM ESTSpecial Weather StatementPHISalem3 hr
Feb 11, 3:37 PM ESTWind AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more12 hr
Feb 11, 5:49 PM ESTSpecial Weather StatementPHISalem86 min

Nearby

Special Weather Statements in New Jersey, 2012Special Weather Statements in Pennsylvania, 2012Special Weather Statements in Delaware, 2012Every special weather statement 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.