Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 76, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2018, 9:00 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 60 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 13, 2018, 9:00 PM EDT (01:00 UTC)
- Expired
- Aug 13, 2018, 10:00 PM EDT
- In force
- 60 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 01:00 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 00:00Z, 1.0 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
- 399 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 664 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.4
The text
As transmitted.
757
WUUS51 KPHI 140100
SVRPHI
PAC017-091-101-140200-
/O.NEW.KPHI.SV.W.0076.180814T0100Z-180814T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
900 PM EDT MON AUG 13 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 1000 PM EDT.
* At 859 PM EDT, a severe thunderstorm was located over Germantown,
or near Philadelphia, moving northeast at 20 mph. It will not take
as much wind to down some trees due to the saturated ground.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Bensalem, Yeadon, Burlington, Bristol, Conshohocken,
Palmyra, Hatboro, Ambler, Jenkintown, Narberth, Rockledge,
Tullytown, Abington, Langhorne, Bryn Athyn, Ivyland, Wissinoming,
Feasterville-Trevose and Morris Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4012 7481 4013 7482 4010 7484 4008 7487
4007 7494 4001 7502 3994 7525 3996 7525
3997 7527 4004 7533 4031 7510 4012 7480
TIME...MOT...LOC 0059Z 235DEG 18KT 4004 7521
HAIL...<.75IN
WIND...60MPH
$$
Gorse3 follow-up statements
534
WWUS51 KPHI 140121
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
921 PM EDT MON AUG 13 2018
PAC017-091-101-140200-
/O.CON.KPHI.SV.W.0076.000000T0000Z-180814T0200Z/
Montgomery PA-Bucks PA-Philadelphia PA-
921 PM EDT MON AUG 13 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS AND NORTHERN
PHILADELPHIA COUNTIES...
At 920 PM EDT, a severe thunderstorm was located over Abington, or 8
miles north of Philadelphia, moving northeast at 20 mph. It will not
take as much wind to down some trees due to the saturated ground.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Bensalem, Burlington, Bristol, Hatboro, Ambler,
Jenkintown, Rockledge, Tullytown, Abington, Langhorne, Bryn Athyn,
Ivyland, Feasterville-Trevose, Willow Grove, Northeast Philadelphia,
Feasterville, Richboro, Andalusia and Holmesburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to damaging winds, frequent cloud to ground lightning is
occurring with this storm. Move indoors immediately. Remember, if
you can hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4012 7481 4013 7482 4010 7484 4008 7487
4007 7494 4004 7501 4002 7514 4006 7519
4008 7522 4012 7526 4031 7510 4012 7480
TIME...MOT...LOC 0120Z 223DEG 18KT 4012 7511
HAIL...<.75IN
WIND...60MPH
$$
Gorse174
WWUS51 KPHI 140147
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
947 PM EDT MON AUG 13 2018
PAC017-091-101-140200-
/O.CON.KPHI.SV.W.0076.000000T0000Z-180814T0200Z/
Montgomery PA-Bucks PA-Philadelphia PA-
947 PM EDT MON AUG 13 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR EAST CENTRAL MONTGOMERY...SOUTHEASTERN BUCKS AND NORTHEASTERN
PHILADELPHIA COUNTIES...
At 947 PM EDT, a severe thunderstorm was located over Newtown, or 10
miles west of Trenton, moving northeast at 30 mph. It will not take
as much wind to down some trees due to the saturated ground.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Bensalem, Hatboro, Langhorne, Bryn Athyn, Ivyland,
Richboro, Feasterville-Trevose, Willow Grove, Andalusia, Northeast
Philadelphia, Langhorn, Levittown, Feasterville, Horsham, Penndel,
Langhorne Manor, Hulmeville, Cornwells Heights-Eddington and
Churchville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4013 7482 4013 7484 4012 7487 4006 7499
4007 7506 4011 7509 4016 7513 4022 7517
4031 7510 4014 7483
TIME...MOT...LOC 0147Z 239DEG 25KT 4023 7496
HAIL...<.75IN
WIND...60MPH
$$
Gorse752
WWUS51 KPHI 140154
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
954 PM EDT MON AUG 13 2018
PAC017-091-101-140204-
/O.EXP.KPHI.SV.W.0076.000000T0000Z-180814T0200Z/
Montgomery PA-Bucks PA-Philadelphia PA-
954 PM EDT MON AUG 13 2018
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY...
SOUTHEASTERN BUCKS AND NORTHEASTERN PHILADELPHIA COUNTIES WILL EXPIRE
AT 1000 PM EDT...
The storm which prompted the warning is weakening. Therefore, the
warning will be allowed to expire. However locally gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 4013 7482 4013 7484 4012 7487 4006 7499
4007 7506 4011 7509 4016 7513 4022 7517
4031 7510 4014 7483
TIME...MOT...LOC 0154Z 235DEG 18KT 4024 7493
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:13 PM EDT | Special Weather Statement | PHI | Montgomery | 32 min |
| Aug 13, 8:16 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 13, 8:51 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 54 min |
| Aug 13, 9:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 44 min |
| Aug 14, 12:50 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 4 hr |
| Aug 14, 3:22 PM EDT | Special Weather Statement | PHI | Lehigh | 53 min |
| Aug 14, 3:58 PM EDT | Special Weather Statement | PHI | Montgomery | 47 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2018Every severe thunderstorm warning in 2018
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.