Alert archive / New Jersey / Red Flag Warnings in 2023

Red Flag Warning 6, NWS Philadelphia/Mount Holly

June 6, 202316 counties in New Jersey; 10 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this red flag warning at Jun 6, 2023, 3:49 AM EDT for 16 counties in New Jersey; 10 counties in Pennsylvania. It took effect at Jun 6, 2023, 11:00 AM EDT. It was in force for 9 hr. 12 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 6, 2023, 3:49 AM EDT (07:49 UTC)
In effect from
Jun 6, 2023, 11:00 AM EDT
Expired
Jun 6, 2023, 8:00 PM EDT
In force
9 hr
Issued by
NWS Philadelphia/Mount Holly
All 26 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, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 61 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.

What was reported inside it

TimeReportWhereRemark
Jun 6, 3:08 PM EDTHAIL 0.52 E Fleetwood, PASocial media photo of hail up to 1/2 inch.
Jun 6, 3:45 PM EDTTSTM WND DMGPottstown, PAtree limbs and power lines down.
Jun 6, 3:45 PM EDTTSTM WND GST 63Pottstown, PA
Jun 6, 4:05 PM EDTTSTM WND DMG1 Wnw Norristown, PATree fell on wires at Haws Ave. and W. Oak St.
Jun 6, 4:05 PM EDTTSTM WND GST 52King Of Prussia, PAtrees and wires down.
Jun 6, 4:05 PM EDTHAIL 1.75King Of Prussia, PA
Jun 6, 4:39 PM EDTHAIL 0.71 N Woodlynne, NJPea to dime sized hail reported.
Jun 6, 5:36 PM EDTTSTM WND GST 444 Se Mystic Island, NJTuckerton XTUK WeatherFlow site.
Jun 6, 5:39 PM EDTTSTM WND GST 474 Se Mystic Island, NJRutgers XRUT WeatherFlow site.
Jun 6, 5:41 PM EDTHAIL 0.251 Nnw Robesonia, PAPea sized hail for approximately 15 minutes.
Jun 6, 6:20 PM EDTHAIL 0.252 Wsw Lakewood Twp, NJ
Jun 6, 6:45 PM EDTTSTM WND GST 394 Ese Mystic Island, NJTuckerton XTUK WeatherFlow site.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 7.8 hours before the alert went out and 196 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 2023-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 joules per kilogram.LCLLFCEL10008507005003002001001 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 2023-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.19395878Sfc1 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
13 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1601 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

453 
WWUS81 KPHI 060749
RFWPHI

URGENT - FIRE WEATHER MESSAGE
National Weather Service Mount Holly NJ
349 AM EDT Tue Jun 6 2023

...CRITICAL FIRE WEATHER CONDITIONS EXPECTED TODAY...

.Low fuel moistures, low daytime relative humidity values, and
breezy conditions will result in critical fire weather conditions
into this afternoon and evening. Any fires that develop may 
quickly get out of control and become difficult to contain. There 
is also a chance of isolated dry thunderstorms, which could serve 
as an ignition source for fires today.

NJZ001-007>010-012>027-PAZ054-055-060>062-070-071-101>106-070000-
/O.UPG.KPHI.FW.A.0003.230606T1500Z-230607T0000Z/
/O.NEW.KPHI.FW.W.0006.230606T1500Z-230607T0000Z/
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-
Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
349 AM EDT Tue Jun 6 2023

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT
THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR SOUTHEASTERN
PENNSYLVANIA, INCLUDING THE LEHIGH VALLEY AND POCONO PLATEAU, 
SOUTHERN AND CENTRAL NEW JERSEY, AND PORTIONS OF NORTHERN NEW 
JERSEY...

The National Weather Service in Mount Holly has issued a Red Flag
Warning for gusty winds and low relative humidity, which is in
effect from 11 AM this morning to 8 PM EDT this evening. The Fire
Weather Watch is no longer in effect.

* AFFECTED AREA...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, Delaware, 
  Philadelphia, Western Chester, Eastern Chester, Western 
  Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks.

* TIMING...Tuesday morning through Tuesday evening.

* WINDS...Northwest 10 to 15 mph with gusts up to 25 mph.

* RELATIVE HUMIDITY...As low as 25 percent.

* TEMPERATURES...In the mid 70s to low 80s.

* IMPACTS...The combination of very dry conditions, low 
  humidity, and gusty winds will result in favorable conditions 
  for the rapid spread of fires on Tuesday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly due to a combination of
strong winds, low relative humidity, and dry fuels. Any fires
that develop may quickly get out of control and become difficult
to contain. 

For more information about wildfire danger, burn restrictions, 
and wildfire prevention and education, please visit your state 
forestry or environmental protection website.

&&

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 6, 5:46 AM EDTCoastal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Ocean21 hr
Jun 6, 2:06 PM EDTSpecial Weather StatementPHIMorris24 min
Jun 6, 2:37 PM EDTSpecial Weather StatementPHIMonmouth23 min
Jun 6, 3:03 PM EDTSpecial Weather StatementPHIMonmouth27 min
Jun 6, 4:21 PM EDTSpecial Marine WarningPHI54 min
Jun 6, 4:25 PM EDTSpecial Weather StatementPHICamden35 min
Jun 6, 4:57 PM EDTSpecial Weather StatementPHIMonmouth33 min
Jun 6, 5:00 PM EDTSpecial Weather StatementPHICamden, Gloucester30 min
Jun 6, 5:08 PM EDTSpecial Marine WarningPHI37 min
Jun 6, 5:20 PM EDTSpecial Weather StatementPHICape May25 min
Jun 6, 5:22 PM EDTSpecial Weather StatementPHIGloucester23 min
Jun 6, 5:32 PM EDTSpecial Weather StatementPHIMonmouth28 min
Jun 6, 5:35 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester25 min
Jun 6, 5:36 PM EDTSpecial Marine WarningPHI39 min
Jun 6, 5:36 PM EDTSpecial Weather StatementPHIAtlantic24 min
Jun 6, 5:47 PM EDTSpecial Marine WarningPHI58 min
Jun 6, 5:48 PM EDTSevere Thunderstorm WarningPHIAtlantic42 min
Jun 6, 5:55 PM EDTSpecial Marine WarningPHI65 min
Jun 6, 6:17 PM EDTSpecial Weather StatementPHIOcean28 min
Jun 6, 7:31 PM EDTSpecial Weather StatementPHISalem29 min
Jun 6, 2:15 PM EDTSpecial Weather StatementPHINorthampton30 min
Jun 6, 2:28 PM EDTSpecial Weather StatementPHIBerks32 min
Jun 6, 2:58 PM EDTSpecial Weather StatementPHIBerks32 min
Jun 6, 3:45 PM EDTSpecial Weather StatementPHIMontgomery30 min
Jun 6, 3:56 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia35 min
Jun 6, 4:00 PM EDTSpecial Weather StatementPHIBerks30 min
Jun 6, 4:06 PM EDTSpecial Weather StatementPHIBerks24 min
Jun 6, 4:13 PM EDTSevere Thunderstorm WarningPHIBerks36 min
Jun 6, 4:41 PM EDTSpecial Weather StatementPHIChester34 min
Jun 6, 4:46 PM EDTSpecial Weather StatementPHIDelaware29 min
Jun 6, 5:05 PM EDTSpecial Weather StatementPHIChester25 min
Jun 6, 5:45 PM EDTSpecial Weather StatementPHIBerks30 min
Jun 6, 6:15 PM EDTSpecial Weather StatementPHIChester30 min
Jun 6, 6:24 PM EDTSevere Thunderstorm WarningPHIChester51 min
Jun 6, 7:39 PM EDTSpecial Weather StatementPHIChester36 min

Nearby

Red Flag Warnings in New Jersey, 2023Red Flag Warnings in Pennsylvania, 2023Every red flag warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.