Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 339, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 8, 2023, 5:14 PM EDT for Hunterdon County, New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 46 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
- Sep 8, 2023, 5:14 PM EDT (21:14 UTC)
- Expired
- Sep 8, 2023, 6:00 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 21:15 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 8, 5:20 PM EDT | TSTM WND DMG | 1 Nw New Britain, PA | Several reports of trees down on wires in central Bucks County. Impacted roads include PARK AV, FERRY RD, NEW GALENA RD, RAILROAD AV, BARRY RD, SUNSET AV, POINT PLEASANT PK, and BYRUM RD. Time estimated from radar. |
| Sep 8, 5:51 PM EDT | TSTM WND DMG | Doylestown, PA | Emergency management reports trees and wires down across Doylestown. Time estimated by radar. |
| Sep 8, 6:02 PM EDT | TSTM WND DMG | Buckingham Twp, PA | Emergency management reports trees and wires down across Buckingham Twp. Time estimated by 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 8, 3:11 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.2 hours before the alert went out and 202 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
- 2469 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.0
The text
As transmitted.
444
WUUS51 KPHI 082114
SVRPHI
NJC019-PAC017-091-082200-
/O.NEW.KPHI.SV.W.0339.230908T2114Z-230908T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
514 PM EDT Fri Sep 8 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Hunterdon County in northwestern New Jersey...
Central Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
* Until 600 PM EDT.
* At 514 PM EDT, a severe thunderstorm was located over Chalfont, or
19 miles north of Philadelphia, moving northeast 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...
Lansdale, Perkasie, Doylestown, Byram, Souderton, Bedminster,
Chalfont, Tinicum, Hatfield, New Hope, Dublin, Frenchtown, Milford,
Stockton, Fricks, Revere, Lumberville, Ottsville, Sergeantsville
and Pipersville.
This includes Northeast Extension between mile markers 31 and 32.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4017 7522 4027 7537 4059 7510 4040 7483
TIME...MOT...LOC 2114Z 224DEG 11KT 4029 7522
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann2 follow-up statements
521
WWUS51 KPHI 082135
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
535 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-082200-
/O.CON.KPHI.SV.W.0339.000000T0000Z-230908T2200Z/
Hunterdon NJ-Montgomery PA-Bucks PA-
535 PM EDT Fri Sep 8 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHWESTERN HUNTERDON...NORTHEASTERN MONTGOMERY AND CENTRAL
BUCKS COUNTIES...
At 535 PM EDT, a severe thunderstorm was located over Doylestown, or
22 miles west of Trenton, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Lansdale, Perkasie, Doylestown, Byram, Souderton, Bedminster,
Chalfont, Tinicum, Hatfield, New Hope, Dublin, Frenchtown, Milford,
Stockton, Fricks, Revere, Lumberville, Ottsville, Sergeantsville and
Pipersville.
This includes Northeast Extension between mile markers 31 and 32.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4027 7537 4059 7510 4040 7483 4020 7527
TIME...MOT...LOC 2135Z 224DEG 11KT 4034 7516
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann446
WWUS51 KPHI 082151 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
551 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-082201-
/O.EXP.KPHI.SV.W.0339.000000T0000Z-230908T2200Z/
Hunterdon NJ-Montgomery PA-Bucks PA-
551 PM EDT Fri Sep 8 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HUNTERDON...
NORTHEASTERN MONTGOMERY AND CENTRAL BUCKS COUNTIES WILL EXPIRE AT 600
PM EDT...
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 will be allowed to expire. However small
hail, gusty winds, and heavy rain are still possible with this
thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northwestern New Jersey...and southeastern 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 4027 7537 4059 7510 4040 7483 4020 7527
TIME...MOT...LOC 2151Z 224DEG 11KT 4037 7512
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 9:46 PM EDT | Special Weather Statement | PHI | Sussex | 29 min |
| Sep 8, 6:02 AM EDT | Special Marine Warning | PHI | 40 min | |
| Sep 8, 1:36 PM EDT | Special Weather Statement | PHI | Burlington | 24 min |
| Sep 8, 1:37 PM EDT | Special Weather Statement | PHI | Monmouth | 23 min |
| Sep 8, 1:46 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 44 min |
| Sep 8, 1:50 PM EDT | Special Marine Warning | PHI | 115 min | |
| Sep 8, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 51 min |
| Sep 8, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 48 min |
| Sep 8, 2:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Middlesex, Monmouth, Ocean | 45 min |
| Sep 8, 2:33 PM EDT | Areal Flood Advisory | PHI | Burlington, Monmouth, Ocean | 3 hr |
| Sep 8, 2:44 PM EDT | Special Marine Warning | PHI | 18 min | |
| Sep 8, 2:45 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 45 min |
| Sep 8, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Somerset | 52 min |
| Sep 8, 3:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Sep 8, 3:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 63 min |
| Sep 8, 3:29 PM EDT | Flash Flood Warning | PHI | Burlington, Ocean | 4 hr |
| Sep 8, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 44 min |
| Sep 8, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 30 min |
| Sep 8, 3:43 PM EDT | Special Weather Statement | PHI | Middlesex | 32 min |
| Sep 8, 3:58 PM EDT | Special Weather Statement | PHI | Somerset | 32 min |
| Sep 8, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 51 min |
| Sep 8, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 51 min |
| Sep 8, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 60 min |
| Sep 8, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 40 min |
| Sep 8, 5:12 PM EDT | Areal Flood Advisory | PHI | Hunterdon | 3 hr |
| Sep 8, 5:21 PM EDT | Flash Flood Warning | PHI | Hunterdon | 4 hr |
| Sep 8, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 41 min |
| Sep 8, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 41 min |
| Sep 8, 6:11 PM EDT | Special Weather Statement | PHI | Warren | 34 min |
| Sep 8, 6:34 PM EDT | Areal Flood Advisory | PHI | Sussex, Warren | 3 hr |
| Sep 7, 8:08 PM EDT | Special Weather Statement | PHI | Chester, Lehigh | 37 min |
| Sep 7, 8:42 PM EDT | Special Weather Statement | PHI | Bucks | 33 min |
| Sep 7, 9:19 PM EDT | Special Weather Statement | PHI | Berks | 26 min |
| Sep 7, 9:37 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 18 min |
| Sep 7, 10:07 PM EDT | Special Weather Statement | PHI | Berks | 38 min |
| Sep 7, 10:38 PM EDT | Areal Flood Advisory | PHI | Berks | 76 min |
| Sep 7, 10:44 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 61 min |
| Sep 8, 5:16 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 3 hr |
| Sep 8, 5:29 PM EDT | Special Weather Statement | PHI | Montgomery | 31 min |
| Sep 8, 6:00 PM EDT | Special Weather Statement | PHI | Bucks | 30 min |
| Sep 8, 6:16 PM EDT | Special Weather Statement | PHI | Northampton | 29 min |
| Sep 8, 6:24 PM EDT | Special Weather Statement | PHI | Monroe | 36 min |
| Sep 8, 6:29 PM EDT | Special Weather Statement | PHI | Bucks | 31 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Severe Thunderstorm Warnings in New Jersey, 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.