Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 250, NWS Philadelphia/Mount Holly

August 24, 2020Carbon County, Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 24, 2020, 4:38 PM EDT for Carbon County, Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 37 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 24, 2020, 4:38 PM EDT (20:38 UTC)
Expired: Aug 24, 2020, 5:15 PM EDT
In force: 37 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 Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 20:40 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

Time	Report	Where	Remark
Aug 24, 4:42 PM EDT	TSTM WND DMG	2 Wsw Kresgeville, PA	DOWNED TREES AND WIRES NEAR WOODCHUCK DRIVE NEAR TRACHSVILLE. TIME ESTIMATED FROM RADAR.
Aug 24, 4:53 PM EDT	TSTM WND DMG	2 Sse Gilbert, PA	DOWNED TREES AND WIRES NEAR FRABLE DRIVE SOUTH OF GILBERT. TIME ESTIMATED FROM RADAR.
Aug 24, 4:55 PM EDT	TSTM WND DMG	1 W Kunkletown, PA	AT LEAST ONE FIRE DEPARTMENT CALL FOR A DOWNED TREE IN ELDRED TWP. TIME ESTIMATED FROM RADAR.
Aug 24, 5:04 PM EDT	TSTM WND DMG	Kunkletown, PA	DOWNED TREES AND WIRES NEAR KUNKLETOWN ROAD. TIME ESTIMATED FROM RADAR.

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 12:00Z, 8.6 hours before the alert went out and 206 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1431 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

766 
WUUS51 KPHI 242038
SVRPHI
NJC041-PAC025-089-095-242115-
/O.NEW.KPHI.SV.W.0250.200824T2038Z-200824T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
438 PM EDT Mon Aug 24 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Warren County in northwestern New Jersey...
  East central Carbon County in northeastern Pennsylvania...
  Southern Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 515 PM EDT.

* At 437 PM EDT, a severe thunderstorm was located over McMichael, or
  10 miles south of Mount Pocono, moving east at 35 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...
  East Stroudsburg, Blairstown, Bangor, Pen Argyl, Wind Gap,
  Belvidere, Oxford, Hope, East Bangor, Stormville, Brodheadsville,
  Kunkletown, Werry Lake, Gilbert, Millbrook, Pocono Raceway,
  Delaware Water Gap, Tannersville, Rossland and Long Pond.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 299 and 314.
 Interstate 80 in New Jersey 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 4085 7557 4106 7555 4108 7496 4077 7491
TIME...MOT...LOC 2037Z 276DEG 29KT 4098 7542 

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

SFJ

3 follow-up statements

853 
WWUS51 KPHI 242052
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
452 PM EDT Mon Aug 24 2020

NJC041-PAC025-089-095-242115-
/O.CON.KPHI.SV.W.0250.000000T0000Z-200824T2115Z/
Warren NJ-Carbon PA-Monroe PA-Northampton PA-
452 PM EDT Mon Aug 24 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL WARREN...EAST CENTRAL CARBON...SOUTHERN MONROE AND
NORTHEASTERN NORTHAMPTON COUNTIES...

At 451 PM EDT, a severe thunderstorm was located over Gilbert, or 15
miles south of Mount Pocono, moving east 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...
East Stroudsburg, Blairstown, Bangor, Pen Argyl, Wind Gap, Belvidere,
Oxford, Hope, East Bangor, Stormville, Brodheadsville, Kunkletown,
Werry Lake, Gilbert, Millbrook, Delaware Water Gap, Tannersville,
Rossland, Kresgeville and Sun Valley.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 301 and 314.
 Interstate 80 in New Jersey 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 4085 7557 4106 7542 4108 7496 4077 7491
TIME...MOT...LOC 2051Z 269DEG 28KT 4090 7541 

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

SFJ

226 
WWUS51 KPHI 242103
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
503 PM EDT Mon Aug 24 2020

NJC041-242112-
/O.CAN.KPHI.SV.W.0250.000000T0000Z-200824T2115Z/
Warren NJ-
503 PM EDT Mon Aug 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WARREN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4085 7557 4097 7547 4098 7525 4081 7522
TIME...MOT...LOC 2102Z 293DEG 16KT 4086 7541 

$$

PAC025-089-095-242115-
/O.CON.KPHI.SV.W.0250.000000T0000Z-200824T2115Z/
Carbon PA-Monroe PA-Northampton PA-
503 PM EDT Mon Aug 24 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR EAST CENTRAL CARBON...SOUTHWESTERN MONROE AND NORTH CENTRAL
NORTHAMPTON COUNTIES...

At 502 PM EDT, a severe thunderstorm was located over Rossland, or 15
miles east of Lehighton, moving southeast at 20 mph.

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

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Pen Argyl, Wind Gap, Rossland, Brodheadsville, Kunkletown,
Saylorsburg, Gilbert, Kresgeville, Trachsville, Fiddletown,
Merwinsburg and Effort.

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 4085 7557 4097 7547 4098 7525 4081 7522
TIME...MOT...LOC 2102Z 293DEG 16KT 4086 7541 

HAIL...0.75IN
WIND...60MPH
 
$$

SFJ

454 
WWUS51 KPHI 242105
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
505 PM EDT Mon Aug 24 2020

PAC025-089-095-242115-
/O.EXP.KPHI.SV.W.0250.000000T0000Z-200824T2115Z/
Carbon PA-Monroe PA-Northampton PA-
505 PM EDT Mon Aug 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CARBON...
SOUTHWESTERN MONROE AND NORTH CENTRAL NORTHAMPTON COUNTIES WILL
EXPIRE AT 515 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4085 7557 4097 7547 4098 7525 4081 7522
TIME...MOT...LOC 2105Z 276DEG 29KT 4086 7538 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 8:20 PM EDT	Special Weather Statement	PHI	Chester	25 min
Aug 23, 8:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	48 min
Aug 24, 1:15 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	21 min
Aug 24, 1:48 PM EDT	Special Weather Statement	PHI	Northampton	27 min
Aug 24, 2:20 PM EDT	Special Weather Statement	PHI	Northampton	25 min
Aug 24, 4:05 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	2 hr
Aug 24, 4:08 PM EDT	Special Weather Statement	PHI	Monroe	37 min
Aug 24, 5:01 PM EDT	Special Weather Statement	PHI	Carbon	29 min
Aug 24, 5:11 PM EDT	Special Weather Statement	PHI	Northampton	34 min
Aug 24, 5:40 PM EDT	Special Weather Statement	PHI	Northampton	35 min
Aug 24, 6:05 PM EDT	Special Weather Statement	PHI	Berks	25 min
Aug 24, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	19 min
Aug 23, 9:10 PM EDT	Special Marine Warning	PHI		40 min
Aug 23, 9:30 PM EDT	Special Weather Statement	PHI	Gloucester	30 min
Aug 24, 3:34 PM EDT	Special Weather Statement	PHI	Somerset	26 min
Aug 24, 5:57 PM EDT	Special Weather Statement	PHI	Middlesex	33 min
Aug 24, 6:10 PM EDT	Special Weather Statement	PHI	Hunterdon	35 min
Aug 24, 6:38 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	37 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.