Alert archive / Pennsylvania / Tornado Warnings in 2020

Tornado Warning 31, NWS Philadelphia/Mount Holly

August 18, 2020Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 18, 2020, 12:31 AM EDT for Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 29 min. 3 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 18, 2020, 12:31 AM EDT (04:31 UTC)
Expired: Aug 18, 2020, 1:00 AM EDT
In force: 29 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

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

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 04:34 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 18, 12:33 AM EDT	TSTM WND DMG	1 W Reeders, PA	DOWNED TREES AND WIRES NEAR MOUNTAIN SPRING LAKE. TIME ESTIMATED FROM RADAR.
Aug 18, 12:34 AM EDT	TSTM WND DMG	1 Sw Scotrun, PA	DOWNED TREE ON CAMELBACK ROAD NEAR RESORT DRIVE IN TANNERSVILLE. TIME ESTIMATED FROM RADAR.
Aug 18, 12:44 AM EDT	TSTM WND DMG	1 Nne Stormville, PA	DOWNED TREE BLOCKING REISH ROAD IN STROUD TOWNSHIP. 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 00:00Z, 4.5 hours before the alert went out and 204 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: 116 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

703 
WFUS51 KPHI 180431
TORPHI
NJC041-PAC089-095-180500-
/O.NEW.KPHI.TO.W.0031.200818T0431Z-200818T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1231 AM EDT Tue Aug 18 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Northwestern Warren County in northwestern New Jersey...
  Central Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 100 AM EDT.
    
* At 1231 AM EDT, a severe thunderstorm capable of producing a
  tornado was located over Reeders, or 7 miles south of Mount Pocono,
  moving east at 30 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  East Stroudsburg, Stormville, Reeders, Delaware Water Gap,
  McMichael, Tannersville, Stroudsburg, Arlington Heights,
  Bartonsville and Shawnee.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 302 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 3.

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.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4100 7541 4106 7538 4103 7508 4087 7513
TIME...MOT...LOC 0431Z 283DEG 25KT 4102 7535 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Robertson

2 follow-up statements

715 
WWUS51 KPHI 180440
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1240 AM EDT Tue Aug 18 2020

NJC041-PAC089-095-180500-
/O.CON.KPHI.TO.W.0031.000000T0000Z-200818T0500Z/
Warren NJ-Monroe PA-Northampton PA-
1240 AM EDT Tue Aug 18 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
NORTHWESTERN WARREN...CENTRAL MONROE AND NORTHEASTERN NORTHAMPTON
COUNTIES...
    
At 1240 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Tannersville, or 9 miles southeast of Mount Pocono,
moving east at 30 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
East Stroudsburg, Stormville, Delaware Water Gap, Tannersville,
Stroudsburg, Arlington Heights, Bartonsville and Shawnee.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 303 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 3.

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.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4097 7535 4105 7531 4103 7508 4087 7513
TIME...MOT...LOC 0440Z 283DEG 25KT 4101 7528 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Staarmann

623 
WWUS51 KPHI 180447
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1247 AM EDT Tue Aug 18 2020

NJC041-PAC089-095-180500-
/O.CON.KPHI.TO.W.0031.000000T0000Z-200818T0500Z/
Warren NJ-Monroe PA-Northampton PA-
1247 AM EDT Tue Aug 18 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
NORTHWESTERN WARREN...EAST CENTRAL MONROE AND NORTHEASTERN
NORTHAMPTON COUNTIES...
    
At 1247 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Stormville, or 13 miles southeast of Mount Pocono,
moving east at 30 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
East Stroudsburg, East Bangor, Stormville, Delaware Water Gap,
Stroudsburg, Arlington Heights and Shawnee.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 308 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 3.

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.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4092 7525 4101 7526 4103 7508 4087 7513
TIME...MOT...LOC 0447Z 288DEG 26KT 4096 7521 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 11:26 PM EDT	Special Weather Statement	PHI	Monroe	49 min
Aug 17, 11:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
Aug 18, 12:39 AM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	66 min
Aug 18, 12:58 AM EDT	Special Weather Statement	PHI	Northampton	47 min
Aug 18, 1:13 AM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Monroe, Northampton	2 hr
Aug 18, 1:38 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	37 min
Aug 17, 11:51 PM EDT	Coastal Flood Statement	PHI	Ocean	4 hr
Aug 18, 2:15 AM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	30 min

Nearby

Tornado Warnings in Pennsylvania, 2020 Tornado Warnings in New Jersey, 2020 Every tornado warning in 2020 Tornadoes 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.