Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 53, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 4, 2021, 3:14 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 46 min. 8 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
- Jun 4, 2021, 3:14 PM EDT (19:14 UTC)
- Expired
- Jun 4, 2021, 4:00 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 Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 68 km from the middle of the area, began a volume at 19:17 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 |
|---|---|---|---|
| Jun 4, 3:19 PM EDT | TSTM WND DMG | Norristown, PA | A COUPLE OF DOWNED TREE AND WIRE REPORTS IN NORRISTOWN. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:26 PM EDT | TSTM WND DMG | 1 Sw Ambler, PA | DOWNED TREE NEAR THE INTERSECTION OF MORRIS ROAD AND BEECH ROAD. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:29 PM EDT | TSTM WND DMG | 1 W Flourtown, PA | DOWNED TREE LIMB BLOCKING VALLEY VIEW ROAD NEAR PARKSIDE ROAD. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:30 PM EDT | TSTM WND DMG | Whitemarsh Twp, PA | A COUPLE OF TREES DOWN IN WHITEMARSH TWP. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:31 PM EDT | TSTM WND DMG | Flourtown, PA | DOWNED TREE LIMBS AND WIRES NEAR HARSTON LANE. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:32 PM EDT | TSTM WND DMG | Upper Dublin Twp, PA | A COUPLE OF CALLS FOR DOWNED TREES AND/OR WIRES IN UPPER DUBLIN TWP. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:56 PM EDT | TSTM WND DMG | Andalusia, PA | SOCIAL MEDIA REPORT OF DOWNED TREE LIMBS FROM STRONG WINDS AND PEA-SIZED HAIL. TIME ESTIMATED FROM RADAR. |
| Jun 4, 3:58 PM EDT | HAIL 0.75 | 1 Wnw Eddington, PA |
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 |
|---|---|---|---|
| Jun 4, 3:09 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.2 hours before the alert went out and 214 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
- 233 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 526 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
503
WUUS51 KPHI 041914
SVRPHI
PAC017-091-101-042000-
/O.NEW.KPHI.SV.W.0053.210604T1914Z-210604T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
314 PM EDT Fri Jun 4 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
South central Bucks County in southeastern Pennsylvania...
Northern Philadelphia County in southeastern Pennsylvania...
* Until 400 PM EDT.
* At 314 PM EDT, a severe thunderstorm was located over Plymouth
Meeting, or 11 miles northwest of Philadelphia, moving east at 25
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...
Philadelphia, Bensalem, Norristown, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Jenkintown, Rockledge, Abington,
Langhorne, Bryn Athyn, Feasterville-Trevose, Willow Grove,
Northeast Philadelphia, Feasterville, Andalusia, Holmesburg and
Plymouth Meeting.
This includes the following highways...
Pennsylvania Turnpike between mile markers 326 and 353.
Northeast Extension between mile markers 21 and 26.
Interstate 95 in Pennsylvania between mile markers 31 and 35.
Interstate 76 in Pennsylvania between mile markers 327 and 329, and
between mile markers 333 and 334.
Interstate 476 in Pennsylvania between mile markers 17 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4006 7495 4003 7501 4008 7540 4009 7542
4009 7546 4020 7535 4019 7492
TIME...MOT...LOC 1914Z 280DEG 21KT 4014 7527
HAIL...1.00IN
WIND...60MPH
$$
JEO2 follow-up statements
776
WWUS51 KPHI 041932
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
332 PM EDT Fri Jun 4 2021
PAC017-091-101-042000-
/O.CON.KPHI.SV.W.0053.000000T0000Z-210604T2000Z/
Montgomery PA-Bucks PA-Philadelphia PA-
332 PM EDT Fri Jun 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHEASTERN MONTGOMERY...SOUTH CENTRAL BUCKS AND NORTHERN
PHILADELPHIA COUNTIES...
At 332 PM EDT, a severe thunderstorm was located over Abington, or 7
miles north of Philadelphia, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Bensalem, Conshohocken, Hatboro, Ambler, Jenkintown,
Rockledge, Abington, Langhorne, Bryn Athyn, Feasterville-Trevose,
Willow Grove, Northeast Philadelphia, Feasterville, Andalusia,
Holmesburg, Plymouth Meeting, Chestnut Hill, Horsham and Langhorne
Manor.
This includes the following highways...
Pennsylvania Turnpike between mile markers 334 and 353.
Interstate 95 in Pennsylvania between mile markers 31 and 35.
Interstate 76 in Pennsylvania between mile markers 333 and 334.
Interstate 476 in Pennsylvania near mile marker 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4006 7495 4003 7501 4007 7531 4020 7524
4019 7492
TIME...MOT...LOC 1932Z 280DEG 21KT 4012 7513
HAIL...1.00IN
WIND...60MPH
$$
JEO003
WWUS51 KPHI 041953 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
353 PM EDT Fri Jun 4 2021
PAC017-091-101-042003-
/O.EXP.KPHI.SV.W.0053.000000T0000Z-210604T2000Z/
Montgomery PA-Bucks PA-Philadelphia PA-
353 PM EDT Fri Jun 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY...
SOUTH CENTRAL BUCKS AND NORTHERN PHILADELPHIA COUNTIES WILL EXPIRE AT
400 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern New Jersey...and southeastern Pennsylvania.
LAT...LON 4006 7495 4003 7501 4007 7531 4020 7524
4019 7492
TIME...MOT...LOC 1953Z 280DEG 21KT 4010 7493
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 8:44 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 30 min |
| Jun 4, 1:02 PM EDT | Special Weather Statement | PHI | Lehigh | 28 min |
| Jun 4, 1:07 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 38 min |
| Jun 4, 1:29 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 2 hr |
| Jun 4, 1:45 PM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 97 min |
| Jun 4, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 41 min |
| Jun 4, 2:21 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 21 min |
| Jun 4, 2:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 51 min |
| Jun 4, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 48 min |
| Jun 4, 3:16 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 98 min |
| Jun 4, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 42 min |
| Jun 4, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 67 min |
| Jun 4, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 44 min |
| Jun 4, 4:20 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 40 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning in 2021
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.