Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 249, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 24, 2020, 1:15 PM EDT for 4 counties in Pennsylvania. It was in force for 21 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 24, 2020, 1:15 PM EDT (17:15 UTC)
- Expired
- Aug 24, 2020, 1:36 PM EDT
- In force
- 21 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 136 km from the middle of the area, began a volume at 17:15 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, 5.3 hours before the alert went out and 225 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.
- 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
The text
As transmitted.
563
WUUS51 KPHI 241715
SVRPHI
PAC025-077-089-095-241800-
/O.NEW.KPHI.SV.W.0249.200824T1715Z-200824T1800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
115 PM EDT Mon Aug 24 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Lehigh County in eastern Pennsylvania...
Southeastern Carbon County in northeastern Pennsylvania...
Southwestern Monroe County in northeastern Pennsylvania...
West central Northampton County in eastern Pennsylvania...
* Until 200 PM EDT.
* At 115 PM EDT, a severe thunderstorm was located over Beltzville
State Park, or 7 miles east of Lehighton, moving east at 10 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...
Northampton, Palmerton, Slatington, Bath, Walnutport, Danielsville,
Kunkletown, Beltzville State Park, Saylorsburg, Rossland,
Berlinsville, Beersville, Kresgeville, Bowmanstown, Parryville,
Chapman, Trachsville and Fiddletown.
This includes Northeast Extension between mile markers 72 and 74, and
near mile marker 77.
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 4080 7569 4091 7562 4090 7528 4066 7544
TIME...MOT...LOC 1715Z 292DEG 9KT 4084 7556
HAIL...1.00IN
WIND...60MPH
$$
SFJ2 follow-up statements
695
WWUS51 KPHI 241726
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
126 PM EDT Mon Aug 24 2020
PAC025-077-089-095-241800-
/O.CON.KPHI.SV.W.0249.000000T0000Z-200824T1800Z/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
126 PM EDT Mon Aug 24 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHEASTERN LEHIGH...SOUTHEASTERN CARBON...SOUTH CENTRAL MONROE
AND WEST CENTRAL NORTHAMPTON COUNTIES...
At 126 PM EDT, a severe thunderstorm was located over Danielsville,
or 9 miles east of Lehighton, moving east at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Northampton, Palmerton, Slatington, Bath, Walnutport, Danielsville,
Kunkletown, Saylorsburg, Rossland, Berlinsville, Beersville,
Bowmanstown, Chapman, Trachsville and Fiddletown.
This includes Northeast Extension between mile markers 71 and 72.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4079 7568 4088 7559 4090 7528 4066 7544
TIME...MOT...LOC 1726Z 292DEG 9KT 4083 7552
HAIL...1.00IN
WIND...60MPH
$$
SFJ070
WWUS51 KPHI 241736
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
136 PM EDT Mon Aug 24 2020
PAC025-077-089-095-241745-
/O.CAN.KPHI.SV.W.0249.000000T0000Z-200824T1800Z/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
136 PM EDT Mon Aug 24 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH...
SOUTHEASTERN CARBON...SOUTH CENTRAL MONROE AND WEST CENTRAL
NORTHAMPTON COUNTIES IS CANCELLED...
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 has been cancelled. However gusty winds are
still possible with this thunderstorm.
LAT...LON 4079 7568 4088 7559 4090 7528 4066 7544
TIME...MOT...LOC 1730Z 292DEG 9KT 4082 7549
$$
SFJThe 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, 1:48 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, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 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 |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.