Alert archive / Pennsylvania / Tornado Warnings in 2020

Tornado Warning 23, NWS Philadelphia/Mount Holly

August 4, 2020Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 4, 2020, 9:29 AM EDT for Monroe County, Northampton County, Pennsylvania. It was in force for 31 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
Aug 4, 2020, 9:29 AM EDT (13:29 UTC)
Expired
Aug 4, 2020, 10:00 AM EDT
In force
31 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 13:31 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, 1.5 hours before the alert went out and 195 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 2020-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 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 2020-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
1593 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.4

Open this sounding in Storm Lab

The text

As transmitted.

874 
WFUS51 KPHI 041329
TORPHI
PAC089-095-041400-
/O.NEW.KPHI.TO.W.0023.200804T1329Z-200804T1400Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
929 AM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Central Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 1000 AM EDT.
    
* At 929 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Pen Argyl, or 11 miles north of Easton, moving
  north at 40 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...
  Mount Pocono, East Stroudsburg, Bangor, Pen Argyl, Wind Gap, East
  Bangor, Stormville, Reeders, Henryville, Saylorsburg, Analomink,
  Delaware Water Gap, McMichael, Tannersville, Scotrun, Pocono Pines,
  Stroudsburg, Roseto, Arlington Heights and Shawnee.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 296 and 314.
 Interstate 380 in Pennsylvania 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 4110 7507 4100 7511 4098 7514 4096 7512
      4080 7518 4081 7533 4112 7545
TIME...MOT...LOC 1329Z 171DEG 34KT 4085 7525 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Gorse
2 follow-up statements
632 
WWUS51 KPHI 041338
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
938 AM EDT Tue Aug 4 2020

PAC089-095-041400-
/O.CON.KPHI.TO.W.0023.000000T0000Z-200804T1400Z/
Monroe PA-Northampton PA-
938 AM EDT Tue Aug 4 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 AM EDT FOR CENTRAL
MONROE AND NORTHEASTERN NORTHAMPTON COUNTIES...
    
At 938 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Pen Argyl, or 15 miles south of Mount Pocono, moving
north at 35 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...
Mount Pocono, East Stroudsburg, Bangor, Pen Argyl, East Bangor,
Stormville, Reeders, Henryville, Saylorsburg, Analomink, Delaware
Water Gap, McMichael, Tannersville, Scotrun, Pocono Pines,
Stroudsburg, Roseto, Arlington Heights, Shawnee and Marshalls Creek.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 296 and 314.
 Interstate 380 in Pennsylvania 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 4110 7507 4100 7511 4098 7514 4096 7512
      4088 7516 4087 7535 4112 7545
TIME...MOT...LOC 1338Z 169DEG 29KT 4091 7527 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Gorse
859 
WWUS51 KPHI 041348
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
948 AM EDT Tue Aug 4 2020

PAC095-041358-
/O.CAN.KPHI.TO.W.0023.000000T0000Z-200804T1400Z/
Northampton PA-
948 AM EDT Tue Aug 4 2020

...THE TORNADO WARNING FOR NORTHEASTERN NORTHAMPTON COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 400 PM EDT for northwestern
New Jersey.

LAT...LON 4110 7507 4100 7511 4098 7514 4096 7512
      4095 7514 4094 7519 4093 7534 4112 7545
TIME...MOT...LOC 1348Z 171DEG 34KT 4101 7529 

$$

PAC089-041400-
/O.CON.KPHI.TO.W.0023.000000T0000Z-200804T1400Z/
Monroe PA-
948 AM EDT Tue Aug 4 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 AM EDT FOR CENTRAL
MONROE COUNTY...
    
At 948 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Tannersville, or 8 miles southeast of Mount Pocono,
moving north at 40 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...
Mount Pocono, East Stroudsburg, Stormville, Reeders, Henryville,
Analomink, Delaware Water Gap, Tannersville, Scotrun, Pocono Pines,
Stroudsburg, Arlington Heights, Shawnee, Marshalls Creek and
Bartonsville.

This includes the following highways...
 Interstate 80 in Pennsylvania between mile markers 296 and 314.
 Interstate 380 in Pennsylvania 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 4110 7507 4100 7511 4098 7514 4096 7512
      4095 7514 4094 7519 4093 7534 4112 7545
TIME...MOT...LOC 1348Z 171DEG 34KT 4101 7529 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Gorse

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 5:17 AM EDTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Aug 4, 7:23 AM EDTTornado WarningPHIChester, Delaware, Montgomery, Philadelphia20 min
Aug 4, 7:28 AM EDTFlash Flood WarningPHIChester, Delaware, Montgomery3 hr
Aug 4, 8:11 AM EDTFlash Flood WarningPHIBucks, Lehigh, Montgomery, Northampton4 hr
Aug 4, 8:19 AM EDTRiver Flood WarningPHIDelaware15 hr
Aug 4, 8:19 AM EDTTornado WarningPHIBucks26 min
Aug 4, 9:23 AM EDTTornado Warning Tornado observedPHIChester22 min
Aug 4, 9:38 AM EDTFlash Flood WarningPHIMonroe, Northampton4 hr
Aug 4, 9:58 AM EDTTornado WarningPHIMonroe16 min
Aug 4, 10:02 AM EDTFlash Flood WarningPHIChester, Delaware4 hr
Aug 4, 10:20 AM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Aug 4, 10:51 AM EDTTornado WarningPHIMontgomery24 min
Aug 4, 11:01 AM EDTFlash Flood WarningPHIBucks4 hr
Aug 4, 11:13 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton4 hr
Aug 4, 11:43 AM EDTFlash Flood WarningPHIBerks, Lehigh, Northampton4 hr
Aug 4, 12:06 PM EDTRiver Flood WarningPHIChester11 hr
Aug 4, 12:37 PM EDTRiver Flood WarningPHIMontgomery14 hr
Aug 4, 12:48 PM EDTRiver Flood WarningPHIChester, Delaware24 hr
Aug 4, 1:01 PM EDTRiver Flood WarningPHIBucks18 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIBerks10 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIMontgomery26 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia43 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIMontgomery, Philadelphia35 hr
Aug 4, 1:59 PM EDTAreal Flood WarningPHIChester, Delaware9 hr
Aug 4, 2:09 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia15 hr
Aug 4, 2:23 PM EDTRiver Flood WarningPHILehigh16 hr
Aug 4, 2:47 PM EDTAreal Flood WarningPHIBucks9 hr
Aug 4, 3:42 PM EDTAreal Flood WarningPHILehigh, Northampton4 hr
Aug 4, 4:39 PM EDTRiver Flood WarningPHIMonroe6 hr
Aug 4, 7:29 PM EDTAreal Flood WarningPHILehigh, Northampton12 hr

Nearby

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