Alert archive / Pennsylvania / Tornado Warnings in 2020

Tornado Warning 6, NWS Philadelphia/Mount Holly

August 2, 2020Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 2, 2020, 6:37 AM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 23 min. 5 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 2, 2020, 6:37 AM EDT (10:37 UTC)
Expired
Aug 2, 2020, 7:00 AM EDT
In force
23 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 10:38 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

TimeReportWhereRemark
Aug 2, 6:41 AM EDTTSTM WND DMG2 Sw Lyons, PADOWNED TREES AND WIRES NEAR FLEETWOOD ROAD BETWEEN FLEETWOOD AND LYONS. TIME ESTIMATED FROM RADAR.
Aug 2, 6:45 AM EDTTSTM WND DMG2 S Kutztown, PADOWNED TREES AND WIRES NEAR BALDY ROAD. TIME ESTIMATED FROM RADAR.
Aug 2, 6:48 AM EDTTSTM WND DMG1 Ene Lyons, PADOWNED TREES AND WIRES NEAR SMOKETOWN ROAD IN LYONS. TIME ESTIMATED FROM RADAR.
Aug 2, 6:50 AM EDTTSTM WND DMG2 Nw Topton, PADOWNED TREES AND WIRES NEAR HINTERLEITER ROAD. TIME ESTIMATED FROM RADAR.
Aug 2, 7:08 AM EDTTSTM WND DMG1 S Ancient Oaks, PADOWNED TREES AND WIRES NEAR ASTER 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 10.6 hours before the alert went out and 221 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, Washington/Dulle, VA at 00:00Z on 2020-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 878 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, Washington/Dulle, VA at 00:00Z on 2020-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
878 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1054 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.7

Open this sounding in Storm Lab

The text

As transmitted.

742 
WFUS51 KPHI 021037
TORPHI
PAC011-077-021100-
/O.NEW.KPHI.TO.W.0006.200802T1037Z-200802T1100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
637 AM EDT Sun Aug 2 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  East central Berks County in eastern Pennsylvania...
  South central Lehigh County in eastern Pennsylvania...

* Until 700 AM EDT.
    
* At 637 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Lyons, or 10 miles northeast of Reading, moving
  northeast at 25 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...
  Kutztown, Fleetwood, Topton, Lyons, Ancient Oaks, Macungie and
  Alburtis.

This includes Interstate 78 in Pennsylvania between mile markers 49
and 50.
 
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 4038 7581 4048 7587 4059 7564 4047 7551
TIME...MOT...LOC 1037Z 242DEG 20KT 4045 7578 

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

$$

JEO
2 follow-up statements
105 
WWUS51 KPHI 021044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
644 AM EDT Sun Aug 2 2020

PAC011-077-021100-
/O.CON.KPHI.TO.W.0006.000000T0000Z-200802T1100Z/
Berks PA-Lehigh PA-
644 AM EDT Sun Aug 2 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 AM EDT FOR EAST
CENTRAL BERKS AND SOUTH CENTRAL LEHIGH COUNTIES...
    
At 644 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Lyons, or 13 miles northeast of Reading, moving
northeast at 25 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...
Fleetwood, Topton, Lyons, Ancient Oaks, Macungie and Alburtis. 

This includes Interstate 78 in Pennsylvania between mile markers 49
and 50.
 
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 4041 7579 4047 7583 4059 7564 4047 7551
TIME...MOT...LOC 1044Z 242DEG 20KT 4047 7573 

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

$$

JEO
390 
WWUS51 KPHI 021059
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
659 AM EDT Sun Aug 2 2020

PAC011-077-021108-
/O.EXP.KPHI.TO.W.0006.000000T0000Z-200802T1100Z/
Berks PA-Lehigh PA-
659 AM EDT Sun Aug 2 2020

...THE TORNADO WARNING FOR EAST CENTRAL BERKS AND SOUTH CENTRAL
LEHIGH COUNTIES WILL EXPIRE AT 700 AM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However, a new 
warning has been issued just east of the previous warning.

LAT...LON 4041 7579 4047 7583 4059 7564 4047 7551
TIME...MOT...LOC 1058Z 242DEG 20KT 4051 7564 

$$

JEO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 3:32 AM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 2, 4:42 AM EDTFlash Flood WarningPHIBerks4 hr
Aug 2, 6:30 AM EDTSevere Thunderstorm WarningPHIBerks, Lehigh45 min
Aug 2, 6:56 AM EDTTornado WarningPHIBerks, Lehigh34 min
Aug 2, 7:13 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton3 hr
Aug 2, 7:29 AM EDTSpecial Weather StatementPHILehigh31 min
Aug 2, 7:34 AM EDTAreal Flood AdvisoryPHIBucks, Lehigh, Northampton3 hr
Aug 2, 7:39 AM EDTTornado WarningPHIBucks, Lehigh, Northampton36 min
Aug 2, 7:49 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton84 min
Aug 2, 7:54 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:24 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:28 AM EDTAreal Flood WarningPHIBerks3 hr
Aug 2, 8:46 AM EDTAreal Flood AdvisoryPHINorthampton3 hr
Aug 2, 3:33 PM EDTFlash Flood WatchPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more48 hr
Aug 2, 5:04 PM EDTTropical Storm WatchPHIBucks, Delaware, Montgomery, Philadelphia18 hr
Aug 2, 5:14 PM EDTSpecial Weather StatementPHICarbon, Monroe31 min
Aug 2, 5:51 PM EDTSpecial Weather StatementPHILehigh, Northampton39 min
Aug 2, 6:29 PM EDTSpecial Weather StatementPHINorthampton31 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.