Alert archive / Pennsylvania / Areal Flood Advisories in 2021

Areal Flood Advisory 21, NWS Philadelphia/Mount Holly

June 8, 20214 counties in Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 8, 2021, 1:27 PM EDT for 4 counties in Pennsylvania; Warren County, New Jersey. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jun 8, 2021, 1:27 PM EDT (17:27 UTC)
Expired
Jun 8, 2021, 4:10 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Warren County, NJ, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 17:28 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 12:00Z, 5.5 hours before the alert went out and 201 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 12:00Z on 2021-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 740 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 12:00Z on 2021-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.1939Sfc1 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
740 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1004 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

833 
WGUS81 KPHI 081727
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
127 PM EDT Tue Jun 8 2021

NJC041-PAC025-077-089-095-082130-
/O.NEW.KPHI.FA.Y.0021.210608T1727Z-210608T2130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Carbon PA-Lehigh PA-Monroe PA-Northampton PA-
127 PM EDT Tue Jun 8 2021

The National Weather Service in Mount Holly has issued a

* Flood Advisory for...
  Warren County in northwestern New Jersey...
  Lehigh County in eastern Pennsylvania...
  Northampton County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  Central Monroe County in northeastern Pennsylvania...

* Until 530 PM EDT.

* At 127 PM EDT, Doppler radar indicated heavy rain due to 
  thunderstorms. Minor flooding is ongoing or expected to begin 
  shortly in the advisory area. Between 1 and 1.5 inches of rain 
  have fallen.

* Some locations that may experience flooding include...
  Allentown, Easton, Lehighton, Bethlehem, Forks, Emmaus, 
  Northampton, East Stroudsburg, Hackettstown, Wilson, Washington, 
  and Blairstown.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 45 and 76.
	Interstate 78 in New Jersey between mile markers 0 and 7.
	Interstate 80 in New Jersey between mile markers 0 and 22.
	Interstate 80 in Pennsylvania between mile markers 299 and 314.
	Northeast Extension between mile markers 49 and 89.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4063 7582 4074 7576 4074 7577 4102 7565
      4109 7522 4114 7515 4114 7508 4108 7503
      4109 7496 4091 7477 4088 7481 4082 7484
      4078 7490 4071 7497 4063 7515 4059 7518
      4061 7520 4058 7527 4050 7538 4048 7558

$$

Iovino
2 follow-up statements
894 
WGUS81 KPHI 081909
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
309 PM EDT Tue Jun 8 2021

PAC025-089-081919-
/O.CAN.KPHI.FA.Y.0021.000000T0000Z-210608T2130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carbon PA-Monroe PA-
309 PM EDT Tue Jun 8 2021

...FLOOD ADVISORY IS CANCELLED FOR SOUTHEASTERN CARBON AND CENTRAL 
MONROE COUNTIES...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 4063 7582 4073 7576 4075 7573 4086 7529
      4093 7521 4096 7513 4099 7513 4103 7504
      4109 7497 4091 7477 4088 7481 4082 7484
      4078 7490 4071 7497 4063 7515 4059 7518
      4061 7520 4058 7527 4050 7539 4048 7558

$$

NJC041-PAC077-095-082130-
/O.CON.KPHI.FA.Y.0021.000000T0000Z-210608T2130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Lehigh PA-Northampton PA-
309 PM EDT Tue Jun 8 2021

...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 530 PM EDT THIS AFTERNOON 
FOR WARREN, LEHIGH, AND NORTHAMPTON COUNTIES...

At 309 PM EDT, Doppler radar indicated heavy rain due to 
thunderstorms. Minor flooding is ongoing or expected to begin 
shortly in the advisory area. Between 1 and 1.5 inches of rain have 
fallen.

Some locations that will experience flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, 
  Hackettstown, Wilson, Washington, Blairstown, Hellertown, and 
  Nazareth.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 45 and 76.
	Interstate 78 in New Jersey between mile markers 0 and 7.
	Interstate 80 in New Jersey between mile markers 1 and 22.
	Northeast Extension between mile markers 49 and 71.

LAT...LON 4063 7582 4073 7576 4075 7573 4086 7529
      4093 7521 4096 7513 4099 7513 4103 7504
      4109 7497 4091 7477 4088 7481 4082 7484
      4078 7490 4071 7497 4063 7515 4059 7518
      4061 7520 4058 7527 4050 7539 4048 7558

$$

Davis
881 
WGUS81 KPHI 082010
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
410 PM EDT Tue Jun 8 2021

NJC041-PAC077-095-082020-
/O.CAN.KPHI.FA.Y.0021.000000T0000Z-210608T2130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Lehigh PA-Northampton PA-
410 PM EDT Tue Jun 8 2021

...FLOOD ADVISORY IS CANCELLED FOR WARREN, LEHIGH, AND NORTHAMPTON 
COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4063 7582 4073 7576 4075 7573 4086 7529
      4093 7521 4096 7513 4099 7513 4103 7504
      4109 7497 4091 7477 4088 7481 4082 7484
      4078 7490 4071 7497 4063 7515 4059 7518
      4061 7520 4058 7527 4050 7539 4048 7558

$$

Davis

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 11:54 AM EDTAreal Flood AdvisoryPHIMonroe2 hr
Jun 8, 12:34 PM EDTFlash Flood WarningPHIMonroe2 hr
Jun 8, 12:40 PM EDTSpecial Weather StatementPHIMonroe35 min
Jun 8, 1:09 PM EDTSpecial Weather StatementPHIMonroe21 min
Jun 8, 1:17 PM EDTSpecial Weather StatementPHIChester13 min
Jun 8, 1:18 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia3 hr
Jun 8, 1:24 PM EDTSpecial Weather StatementPHIDelaware21 min
Jun 8, 1:35 PM EDTFlash Flood WarningPHIChester, Delaware, Montgomery5 hr
Jun 8, 2:07 PM EDTSpecial Weather StatementPHIBucks23 min
Jun 8, 2:19 PM EDTAreal Flood AdvisoryPHIBucks2 hr
Jun 8, 2:43 PM EDTSpecial Weather StatementPHIMontgomery32 min
Jun 8, 3:15 PM EDTSpecial Weather StatementPHIChester30 min
Jun 8, 3:21 PM EDTFlash Flood WarningPHIChester, Montgomery3 hr
Jun 8, 3:43 PM EDTSpecial Weather StatementPHIChester32 min
Jun 8, 4:20 PM EDTSpecial Weather StatementPHIChester25 min
Jun 8, 4:25 PM EDTRiver Flood WarningPHIChester11 hr
Jun 8, 6:21 PM EDTAreal Flood WarningPHIChester, Delaware15 hr
Jun 8, 7:14 PM EDTRiver Flood WarningPHIChester, Delaware18 hr
Jun 8, 1:49 PM EDTSpecial Weather StatementPHIWarren26 min
Jun 8, 1:54 PM EDTAreal Flood AdvisoryPHIMorris, Sussex95 min
Jun 8, 2:29 PM EDTSpecial Weather StatementPHIMorris16 min
Jun 8, 2:48 PM EDTSpecial Weather StatementPHIHunterdon, Morris, Somerset27 min
Jun 8, 3:13 PM EDTSpecial Weather StatementPHIHunterdon, Somerset32 min
Jun 8, 3:14 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset74 min
Jun 8, 4:12 PM EDTSevere Thunderstorm WarningPHIMonmouth48 min
Jun 8, 4:14 PM EDTSpecial Marine WarningPHI91 min
Jun 8, 4:44 PM EDTSpecial Weather StatementPHISalem31 min
Jun 8, 4:47 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem43 min
Jun 8, 4:54 PM EDTSpecial Marine WarningPHI96 min
Jun 8, 4:56 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Gloucester49 min
Jun 8, 4:58 PM EDTSevere Thunderstorm WarningPHIOcean47 min
Jun 8, 5:30 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem45 min
Jun 8, 5:43 PM EDTSpecial Weather StatementPHIOcean32 min
Jun 8, 6:01 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Ocean44 min
Jun 8, 6:22 PM EDTSpecial Marine WarningPHI83 min
Jun 8, 7:39 PM EDTSpecial Marine WarningPHI66 min
Jun 8, 7:52 PM EDTSpecial Weather StatementPHICape May38 min

Nearby

Areal Flood Advisories in Pennsylvania, 2021Areal Flood Advisories in New Jersey, 2021Every areal flood advisory in 2021

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.