Alert archive / Pennsylvania / Tornado Warnings in 2023
Tornado Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Aug 7, 2023, 6:35 PM EDT for 4 counties in Pennsylvania. It was in force for 25 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 7, 2023, 6:35 PM EDT (22:35 UTC)
- Expired
- Aug 7, 2023, 7:00 PM EDT
- In force
- 25 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 22:36 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 |
|---|---|---|---|
| Aug 7, 6:43 PM EDT | TSTM WND DMG | Haverford, PA | Report of multiple trees down in Haverford on social media. Photo on social media of a tree down on a car. Time estimated via radar. |
| Aug 7, 6:46 PM EDT | TSTM WND DMG | 1 Se King Of Prussia, PA | Large tree down on I-76 Eastbound with a lane blockage. Time estimated from radar. |
| Aug 7, 6:49 PM EDT | TSTM WND DMG | Chestnut Hill, PA | Pictures of extensive tree damage in Chestnut Hill. Time estimated from radar. |
| Aug 7, 6:50 PM EDT | TSTM WND GST 55 | Glenside, PA | |
| Aug 7, 7:00 PM EDT | TSTM WND DMG | Horsham Twp, PA | Davis Grove Road at Park Road closed due to downed tree. 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 |
|---|---|---|---|
| Aug 7, 3:13 PM EDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 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.
- Mixed-layer CAPE
- 36 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 726 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 143 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
863
WFUS51 KPHI 072235
TORPHI
PAC029-045-091-101-072300-
/O.NEW.KPHI.TO.W.0031.230807T2235Z-230807T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
635 PM EDT Mon Aug 7 2023
The National Weather Service in Mount Holly NJ has issued a
* Tornado Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
Eastern Chester County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
* Until 700 PM EDT.
* At 635 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Newtown Square, or 10 miles east of West Chester,
moving northeast at 50 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...
Philadelphia, Norristown, Lansdale, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Jenkintown, Abington, Bryn Athyn,
Willow Grove, Bryn Mawr, Trout Lake, Radnor Township, Plymouth
Meeting, Newtown Square, Chestnut Hill, King Of Prussia and
Broomall.
This includes the following highways...
Pennsylvania Turnpike between mile markers 326 and 346.
Northeast Extension between mile markers 21 and 27.
Interstate 76 in Pennsylvania between mile markers 327 and 336.
Interstate 476 in Pennsylvania between mile markers 9 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4029 7526 4015 7504 3994 7541 4000 7550
TIME...MOT...LOC 2235Z 220DEG 43KT 3999 7541
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
RCM2 follow-up statements
733
WWUS51 KPHI 072243
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
643 PM EDT Mon Aug 7 2023
PAC029-072253-
/O.CAN.KPHI.TO.W.0031.000000T0000Z-230807T2300Z/
Chester PA-
643 PM EDT Mon Aug 7 2023
...THE TORNADO WARNING FOR EASTERN CHESTER COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled. A
Severe Thunderstorm Warning remains in effect.
A Tornado Watch remains in effect until 1100 PM EDT for southeastern
Pennsylvania.
LAT...LON 4028 7526 4027 7522 4015 7504 4001 7536
4004 7541 4007 7536 4006 7539 4009 7542
TIME...MOT...LOC 2243Z 220DEG 43KT 4007 7533
$$
PAC045-091-101-072300-
/O.CON.KPHI.TO.W.0031.000000T0000Z-230807T2300Z/
Montgomery PA-Philadelphia PA-Delaware PA-
643 PM EDT Mon Aug 7 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHEASTERN MONTGOMERY...NORTHWESTERN PHILADELPHIA AND NORTHERN
DELAWARE COUNTIES...
At 643 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Conshohocken, or 10 miles west of Philadelphia,
moving northeast at 50 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...
Philadelphia, Norristown, Lansdale, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Abington, Bryn Athyn, Willow Grove,
Radnor Township, Plymouth Meeting, King Of Prussia, Chestnut Hill,
Bryn Mawr, Horsham, Bridgeport, North Wales and West Conshohocken.
This includes the following highways...
Pennsylvania Turnpike between mile markers 326 and 346.
Northeast Extension between mile markers 21 and 26.
Interstate 76 in Pennsylvania between mile markers 327 and 335.
Interstate 476 in Pennsylvania between mile markers 12 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4028 7526 4027 7522 4015 7504 4001 7536
4004 7541 4007 7536 4006 7539 4009 7542
TIME...MOT...LOC 2243Z 220DEG 43KT 4007 7533
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
RCM799
WWUS51 KPHI 072250
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
650 PM EDT Mon Aug 7 2023
PAC045-091-101-072300-
/O.EXP.KPHI.TO.W.0031.000000T0000Z-230807T2300Z/
Montgomery PA-Philadelphia PA-Delaware PA-
650 PM EDT Mon Aug 7 2023
...THE TORNADO WARNING FOR SOUTHEASTERN MONTGOMERY...NORTHWESTERN
PHILADELPHIA AND NORTHERN DELAWARE COUNTIES WILL EXPIRE AT 700 PM
EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1100 PM EDT for southeastern
Pennsylvania.
Remember, a Severe Thunderstorm Warning still remains in effect.
LAT...LON 4028 7526 4027 7522 4015 7504 4001 7536
4004 7541 4007 7536 4006 7539 4009 7542
TIME...MOT...LOC 2250Z 220DEG 43KT 4013 7527
$$
RCMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 57 min |
| Aug 7, 5:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 53 min |
| Aug 7, 5:57 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 79 min |
| Aug 7, 6:08 PM EDT | Tornado Warning | PHI | Chester | 19 min |
| Aug 7, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 69 min |
| Aug 7, 6:29 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 63 min |
| Aug 7, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 45 min |
| Aug 7, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more | 52 min |
| Aug 7, 7:00 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh, Montgomery, Northampton | 66 min |
| Aug 7, 7:20 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 58 min |
| Aug 7, 7:27 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 48 min |
Nearby
Tornado Warnings in Pennsylvania, 2023Every tornado warning in 2023Tornadoes 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.