Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 84, NWS Philadelphia/Mount Holly

June 28, 2020Carbon County, Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 3:20 PM EDT for Carbon County, Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 40 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
Jun 28, 2020, 3:20 PM EDT (19:20 UTC)
Expired
Jun 28, 2020, 4:00 PM EDT
In force
40 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

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

The radar

The Binghamton radar (KBGM), 136 km from the middle of the area, began a volume at 19:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 28, 1:32 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.3 hours before the alert went out and 205 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 2020-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1270 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 2020-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
1270 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted.

104 
WUUS51 KPHI 281920
SVRPHI
NJC041-PAC025-089-095-282000-
/O.NEW.KPHI.SV.W.0084.200628T1920Z-200628T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
320 PM EDT Sun Jun 28 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Warren County in northwestern New Jersey...
  Northeastern Carbon County in northeastern Pennsylvania...
  Monroe County in northeastern Pennsylvania...
  Northern Northampton County in eastern Pennsylvania...

* Until 400 PM EDT.

* At 320 PM EDT, severe thunderstorms were located along a line
  extending from near Arrowhead Lake to Ledgerdale to near
  Narrowsburg, moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Mount Pocono, East Stroudsburg, Tobyhanna, Blairstown, Bangor, Pen
  Argyl, Wind Gap, East Bangor, Stormville, Werry Lake, Pocono Pines,
  Millbrook, Lake Harmony, Skytop, Tannersville, Long Pond,
  Kresgeville, Sun Valley, Reeders and Saylorsburg.

People attending Races at Pocono Raceway should seek safe shelter
immediately!

This includes the following highways...
 Northeast Extension between mile markers 85 and 97.
 Interstate 80 in Pennsylvania between mile markers 280 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 10.
 Interstate 380 in Pennsylvania between mile markers 0 and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 4115 7515 4114 7509 4108 7503 4110 7497
      4100 7486 4097 7490 4071 7548 4110 7575
      4114 7568 4112 7565 4112 7564 4123 7554
      4125 7513
TIME...MOT...LOC 1920Z 322DEG 28KT 4122 7561 4136 7528 4156 7501 

HAIL...1.00IN
WIND...60MPH
 
$$

Fitzsimmons
1 follow-up statement
587 
WWUS51 KPHI 281944
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
344 PM EDT Sun Jun 28 2020

NJC041-PAC025-089-095-282000-
/O.CON.KPHI.SV.W.0084.000000T0000Z-200628T2000Z/
Warren NJ-Carbon PA-Monroe PA-Northampton PA-
344 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHWESTERN WARREN...NORTHEASTERN CARBON...MONROE AND NORTHERN
NORTHAMPTON COUNTIES...

At 344 PM EDT, a severe thunderstorm was located over Angels, or 9
miles north of Mount Pocono, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Mount Pocono, East Stroudsburg, Tobyhanna, Blairstown, Bangor, Pen
Argyl, Wind Gap, East Bangor, Stormville, Werry Lake, Pocono Pines,
Millbrook, Lake Harmony, Skytop, Tannersville, Long Pond,
Kresgeville, Sun Valley, Reeders and Saylorsburg.

People attending Races at Pocono Raceway should seek safe shelter
immediately!

This includes the following highways...
 Northeast Extension between mile markers 85 and 97.
 Interstate 80 in Pennsylvania between mile markers 280 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 10.
 Interstate 380 in Pennsylvania between mile markers 0 and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4115 7515 4114 7509 4108 7503 4110 7497
      4100 7486 4097 7490 4071 7548 4110 7575
      4114 7568 4112 7565 4112 7564 4123 7554
      4125 7513
TIME...MOT...LOC 1944Z 316DEG 19KT 4126 7541 

HAIL...1.00IN
WIND...60MPH
 
$$

Fitzsimmons

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 2:02 PM EDTSevere Thunderstorm WarningPHINorthampton13 min
Jun 28, 4:28 PM EDTSpecial Weather StatementPHILehigh32 min
Jun 28, 5:06 PM EDTSpecial Weather StatementPHILehigh24 min
Jun 28, 5:09 PM EDTSevere Thunderstorm WarningPHIChester, Delaware36 min
Jun 28, 5:14 PM EDTSevere Thunderstorm WarningPHINorthampton46 min
Jun 28, 5:56 PM EDTSpecial Weather StatementPHIBerks34 min
Jun 28, 1:15 PM EDTSpecial Weather StatementPHISussex30 min
Jun 28, 1:22 PM EDTSevere Thunderstorm WarningPHISussex38 min
Jun 28, 3:41 PM EDTSevere Thunderstorm WarningPHIMorris, Somerset36 min
Jun 28, 5:06 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex39 min
Jun 28, 5:48 PM EDTSevere Thunderstorm WarningPHIMorris27 min
Jun 28, 5:49 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Somerset15 min
Jun 28, 5:59 PM EDTSpecial Marine WarningPHI61 min
Jun 28, 6:15 PM EDTSevere Thunderstorm WarningPHIMorris30 min
Jun 28, 7:58 PM EDTSpecial Marine WarningPHI62 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in New Jersey, 2020Every severe thunderstorm warning in 2020

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.