Alert archive / New Jersey / Red Flag Warnings in 2012

Red Flag Warning 9, NWS Philadelphia/Mount Holly

April 17, 201216 counties in New Jersey; 7 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this red flag warning at Apr 17, 2012, 3:28 AM EDT for 16 counties in New Jersey; 7 counties in Pennsylvania. It took effect at Apr 17, 2012, 10:00 AM EDT. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 17, 2012, 3:28 AM EDT (07:28 UTC)
In effect from
Apr 17, 2012, 10:00 AM EDT
Expired
Apr 17, 2012, 8:00 PM EDT
In force
10 hr
Issued by
NWS Philadelphia/Mount Holly
All 23 counties

Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 58 km from the middle of the area, began a volume at 07:30 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, 7.5 hours before the alert went out and 192 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 2012-04-17Temperature 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 2012-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.193958Sfc1 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
1779 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
81 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.

398 
WWUS81 KPHI 170728
RFWPHI

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
328 AM EDT TUE APR 17 2012

NJZ001-007>010-012>027-PAZ054-055-060>062-067>071-180000-
/O.UPG.KPHI.FW.A.0008.120417T1400Z-120418T0000Z/
/O.NEW.KPHI.FW.W.0009.120417T1400Z-120418T0000Z/
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
328 AM EDT TUE APR 17 2012

...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 8 PM EDT
THIS EVENING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A RED FLAG
WARNING. IT IS IN EFFECT FROM 1000 AM UNTIL 800 PM. THE FIRE
WEATHER WATCH IS NO LONGER IN EFFECT.

* AFFECTED AREAS...THE POCONOS, THE LEHIGH VALLEY, BERKS COUNTY
  AND SOUTHEASTERN PENNSYLVANIA, AS WELL AS NORTHWESTERN, CENTRAL
  AND SOUTHERN NEW JERSEY.

* WINDS...NORTHWEST AT 10 TO 15 MPH TODAY WITH GUSTS AROUND 20
  MPH.

* RELATIVE HUMIDITY...MAINLY IN THE 20 TO 30 PERCENT RANGE FROM
  LATE THIS MORNING INTO THE EARLY EVENING HOURS.

* IMPACTS...THE POTENTIAL FOR THE RAPID SPREAD OF WILDFIRES
  REMAINS HIGH TODAY DUE TO THE EXPECTED GUSTY WINDS AND THE
  CONTINUED DRY CONDITIONS. OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EXPECTED DUE TO THE COMBINATION OF GUSTY WINDS, LOW RELATIVE
HUMIDITY VALUES AND DRY FINE FUELS.

&&

$$

IOVINO
1 follow-up statement
406 
WWUS81 KPHI 172350
RFWPHI

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
750 PM EDT TUE APR 17 2012

NJZ001-007>010-012>027-PAZ054-055-060>062-067>071-180100-
/O.EXP.KPHI.FW.W.0009.000000T0000Z-120418T0000Z/
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
750 PM EDT TUE APR 17 2012

...RED FLAG WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING...

RELATIVE HUMIDITY VALUES WILL REMAIN LOW FOR A FEW HOURS THIS
EVENING BEFORE RISING OVERNIGHT. HOWEVER, WINDS HAVE DROPPED
BELOW 20 MPH, THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

$$

ROBERTSON

Nearby

Red Flag Warnings in New Jersey, 2012Red Flag Warnings in Pennsylvania, 2012Every red flag warning 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.