Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 314, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2023, 6:24 PM EDT for 4 counties in Pennsylvania. It was in force for 24 min. 1 report 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
- Sep 7, 2023, 6:24 PM EDT (22:24 UTC)
- Expired
- Sep 7, 2023, 6:48 PM EDT
- In force
- 24 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 22:24 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 |
|---|---|---|---|
| Sep 7, 6:24 PM EDT | TSTM WND DMG | 1 Nnw Upper Milford Twp, PA | Downed trees on wires on MAIN RD, BRUNNER RD, VERA CRUZ RD, and ST PETERS RD. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 7, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 209 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
- 2039 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1218 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
697
WUUS51 KPHI 072224
SVRPHI
PAC017-077-089-095-072315-
/O.NEW.KPHI.SV.W.0314.230907T2224Z-230907T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
624 PM EDT Thu Sep 7 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
South central Monroe County in northeastern Pennsylvania...
Northampton County in eastern Pennsylvania...
* Until 715 PM EDT.
* At 624 PM EDT, a severe thunderstorm was located over Ancient Oaks,
or 7 miles southwest of Allentown, moving northeast 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...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton,
Quakertown, Wilson, Hellertown, Nazareth, Slatington, Bath,
Walnutport, Belfast, West Easton, Tatamy, Riegelsville, Steuben,
Glendon and Pleasant Valley.
This includes the following highways...
Northeast Extension between mile markers 42 and 67.
Interstate 78 in Pennsylvania between mile markers 45 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
&&
LAT...LON 4071 7519 4068 7520 4068 7517 4065 7520
4057 7519 4056 7516 4039 7543 4060 7577
4081 7553 4082 7548 4084 7549 4091 7541
TIME...MOT...LOC 2224Z 227DEG 31KT 4053 7558
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
064
WWUS51 KPHI 072241
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
641 PM EDT Thu Sep 7 2023
PAC017-072251-
/O.CAN.KPHI.SV.W.0314.000000T0000Z-230907T2315Z/
Bucks PA-
641 PM EDT Thu Sep 7 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BUCKS COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and northeastern Pennsylvania.
LAT...LON 4051 7542 4068 7568 4081 7553 4082 7548
4084 7549 4091 7541 4072 7520
TIME...MOT...LOC 2241Z 217DEG 31KT 4066 7550
$$
PAC077-089-095-072315-
/O.CON.KPHI.SV.W.0314.000000T0000Z-230907T2315Z/
Lehigh PA-Monroe PA-Northampton PA-
641 PM EDT Thu Sep 7 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHEASTERN LEHIGH...SOUTH CENTRAL MONROE AND CENTRAL
NORTHAMPTON COUNTIES...
At 641 PM EDT, a severe thunderstorm was located over Northampton, or
near Allentown, moving northeast 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...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, Slatington, Bath, Walnutport, Belfast, Tatamy,
Steuben, Kunkletown, Neffs, Coffeetown, Rossland and Berlinsville.
This includes the following highways...
Northeast Extension between mile markers 59 and 67.
Interstate 78 in Pennsylvania between mile markers 58 and 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
&&
LAT...LON 4051 7542 4068 7568 4081 7553 4082 7548
4084 7549 4091 7541 4072 7520
TIME...MOT...LOC 2241Z 217DEG 31KT 4066 7550
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS653
WWUS51 KPHI 072248
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
648 PM EDT Thu Sep 7 2023
PAC077-089-095-072258-
/O.CAN.KPHI.SV.W.0314.000000T0000Z-230907T2315Z/
Lehigh PA-Monroe PA-Northampton PA-
648 PM EDT Thu Sep 7 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH...SOUTH
CENTRAL MONROE AND CENTRAL NORTHAMPTON COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and northeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4051 7542 4068 7568 4081 7553 4082 7548
4084 7549 4091 7541 4072 7520
TIME...MOT...LOC 2245Z 227DEG 31KT 4070 7544
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 33 min |
| Sep 7, 1:38 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 19 min |
| Sep 7, 2:10 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 50 min |
| Sep 7, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 47 min |
| Sep 7, 2:52 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 24 min |
| Sep 7, 4:35 PM EDT | Special Weather Statement | PHI | Berks | 25 min |
| Sep 7, 4:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 43 min |
| Sep 7, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe | 43 min |
| Sep 7, 5:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 31 min |
| Sep 7, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 41 min |
| Sep 7, 5:44 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Lehigh, Montgomery, Northampton | 46 min |
| Sep 7, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 42 min |
| Sep 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Monroe, Northampton | 34 min |
| Sep 7, 6:06 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 24 min |
| Sep 7, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 42 min |
| Sep 7, 7:00 PM EDT | Special Weather Statement | PHI | Montgomery | 30 min |
| Sep 7, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 39 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023
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.