Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 84, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2017, 4:50 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, New Jersey. It was in force for 40 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
- Jul 13, 2017, 4:50 PM EDT (20:50 UTC)
- Expired
- Jul 13, 2017, 5:30 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Burlington County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 20:52 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 13, 2:57 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.8 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
- 572 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.3
The text
As transmitted.
675
WUUS51 KPHI 132050 RRA
SVRPHI
NJC005-PAC017-091-101-132130-
/O.NEW.KPHI.SV.W.0084.170713T2050Z-170713T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
450 PM EDT THU JUL 13 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
North central Burlington County in southern New Jersey...
East central Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
Northeastern Philadelphia County in southeastern Pennsylvania...
* Until 530 PM EDT
* At 449 PM EDT, a severe thunderstorm was located over Ambler, or 12
miles northwest of Philadelphia, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect damage to
trees and power lines.
* Locations impacted include...
Philadelphia, Bensalem, Ewing, Norristown, East Norriton, Florence,
Burlington, Bristol, Hatboro, Ambler, Jenkintown, Beverly, Yardley,
Newtown, Tullytown, Abington, Langhorne, Bryn Athyn, Ivyland and
Feasterville-Trevose.
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 4012 7532 4020 7532 4027 7485 4024 7482
4005 7478
TIME...MOT...LOC 2049Z 267DEG 27KT 4017 7524
HAIL...1.00IN
WIND...60MPH
$$
MWG1 follow-up statement
073
WWUS51 KPHI 132121
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
521 PM EDT THU JUL 13 2017
PAC091-132131-
/O.CAN.KPHI.SV.W.0084.000000T0000Z-170713T2130Z/
Montgomery PA-
521 PM EDT THU JUL 13 2017
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 900 PM EDT for
southern and central New Jersey...and southeastern Pennsylvania.
LAT...LON 4008 7502 4009 7503 4012 7504 4014 7502
4015 7504 4024 7506 4027 7485 4025 7484
4024 7482 4005 7478
TIME...MOT...LOC 2121Z 277DEG 25KT 4011 7497
$$
NJC005-PAC017-101-132130-
/O.CON.KPHI.SV.W.0084.000000T0000Z-170713T2130Z/
Burlington NJ-Bucks PA-Philadelphia PA-
521 PM EDT THU JUL 13 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTH CENTRAL BURLINGTON...SOUTHEASTERN BUCKS AND NORTHEASTERN
PHILADELPHIA COUNTIES...
At 521 PM EDT, a severe thunderstorm was located over Bensalem, or 11
miles northeast of Philadelphia, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Philadelphia, Bensalem, Ewing, Florence, Burlington, Bristol,
Beverly, Yardley, Newtown, Tullytown, Langhorne,
Feasterville-Trevose, Florence-Roebling, Northeast Philadelphia,
Feasterville, Woodside, Richboro, Langhorn, Levittown and Penndel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4008 7502 4009 7503 4012 7504 4014 7502
4015 7504 4024 7506 4027 7485 4025 7484
4024 7482 4005 7478
TIME...MOT...LOC 2121Z 277DEG 25KT 4011 7497
HAIL...<.75IN
WIND...60MPH
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 3:25 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jul 13, 3:30 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 45 min |
| Jul 13, 4:06 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Monroe, Northampton | 114 min |
| Jul 13, 4:06 PM EDT | Special Weather Statement | PHI | Northampton | 39 min |
| Jul 13, 4:08 PM EDT | Special Weather Statement | PHI | Schuylkill | 37 min |
| Jul 13, 4:09 PM EDT | Special Weather Statement | PHI | Montgomery | 36 min |
| Jul 13, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 60 min |
| Jul 13, 4:34 PM EDT | Special Weather Statement | PHI | Chester | 41 min |
| Jul 13, 4:36 PM EDT | Special Weather Statement | PHI | Lehigh | 24 min |
| Jul 13, 4:42 PM EDT | Special Weather Statement | PHI | Montgomery, Philadelphia | 48 min |
| Jul 13, 4:50 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Montgomery | 115 min |
| Jul 13, 5:07 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 7 hr |
| Jul 13, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 35 min |
| Jul 13, 5:08 PM EDT | Tornado Warning | PHI | Berks | 22 min |
| Jul 13, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 54 min |
| Jul 13, 5:25 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 3 hr |
| Jul 13, 5:26 PM EDT | Tornado Warning | PHI | Berks, Chester, Montgomery | 28 min |
| Jul 13, 5:30 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 45 min |
| Jul 13, 5:31 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Jul 13, 5:36 PM EDT | Special Weather Statement | PHI | Montgomery | 39 min |
| Jul 13, 5:44 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 46 min |
| Jul 13, 5:56 PM EDT | Special Weather Statement | PHI | Berks | 34 min |
| Jul 13, 6:28 PM EDT | Special Weather Statement | PHI | Bucks | 47 min |
| Jul 13, 6:34 PM EDT | Special Weather Statement | PHI | Delaware, Montgomery, Philadelphia | 41 min |
| Jul 13, 7:03 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 117 min |
| Jul 13, 7:12 PM EDT | Special Weather Statement | PHI | Philadelphia | 48 min |
| Jul 13, 7:26 PM EDT | Special Weather Statement | PHI | Berks, Montgomery | 64 min |
| Jul 12, 8:22 PM EDT | Special Weather Statement | PHI | Morris | 53 min |
| Jul 12, 9:17 PM EDT | Special Weather Statement | PHI | Morris | 28 min |
| Jul 13, 3:25 PM EDT | Special Weather Statement | PHI | Sussex | 50 min |
| Jul 13, 3:28 PM EDT | Special Weather Statement | PHI | Middlesex | 47 min |
| Jul 13, 3:58 PM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| Jul 13, 4:40 PM EDT | Special Weather Statement | PHI | Hunterdon, Middlesex, Somerset | 50 min |
| Jul 13, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset | 55 min |
| Jul 13, 4:58 PM EDT | Special Marine Warning | PHI | 62 min | |
| Jul 13, 5:14 PM EDT | Special Weather Statement | PHI | Mercer | 46 min |
| Jul 13, 5:33 PM EDT | Special Marine Warning | PHI | 87 min | |
| Jul 13, 5:39 PM EDT | Special Weather Statement | PHI | Mercer | 36 min |
| Jul 13, 6:07 PM EDT | Special Weather Statement | PHI | Atlantic | 23 min |
| Jul 13, 6:07 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 25 min |
| Jul 13, 6:09 PM EDT | Special Marine Warning | PHI | 66 min | |
| Jul 13, 6:20 PM EDT | Special Weather Statement | PHI | Burlington | 40 min |
| Jul 13, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Monmouth, Ocean | 45 min |
| Jul 13, 6:55 PM EDT | Special Marine Warning | PHI | 95 min | |
| Jul 13, 7:00 PM EDT | Special Marine Warning | PHI | 90 min | |
| Jul 13, 7:55 PM EDT | Special Weather Statement | PHI | Ocean | 35 min |
| Jul 13, 7:58 PM EDT | Special Weather Statement | PHI | Cumberland | 32 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2017Severe Thunderstorm Warnings in New Jersey, 2017Every severe thunderstorm warning in 2017
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.