Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 88, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2017, 5:44 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 46 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, 5:44 PM EDT (21:44 UTC)
- Expired
- Jul 13, 2017, 6:30 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 21:48 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, 9.7 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
- 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.
440
WUUS51 KPHI 132144
SVRPHI
PAC017-091-132230-
/O.NEW.KPHI.SV.W.0088.170713T2144Z-170713T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
544 PM EDT THU JUL 13 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
* Until 630 PM EDT
* At 543 PM EDT, a severe thunderstorm was located over Collegeville,
or 20 miles northeast of West Chester, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* This severe thunderstorm will be near,
East Norriton around 550 PM EDT.
Lansdale, Souderton and Hatfield around 600 PM EDT.
Ambler around 605 PM EDT.
Perkasie and Fricks around 610 PM EDT.
Chalfont and Dublin around 615 PM EDT.
Doylestown and Ivyland around 625 PM EDT.
Other locations impacted by this severe thunderstorm include
Harleysville, Sellersville, Horsham, Warminster Heights, Evansburg,
Silverdale, Audubon, Telford, Blue Bell and Maple Glen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
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 4048 7518 4018 7499 4010 7546 4012 7547
4013 7546 4013 7547 4028 7555
TIME...MOT...LOC 2143Z 247DEG 23KT 4022 7543
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
Robertson1 follow-up statement
522 WWUS51 KPHI 132205 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 605 PM EDT THU JUL 13 2017 PAC017-091-132230- /O.CON.KPHI.SV.W.0088.000000T0000Z-170713T2230Z/ Montgomery PA-Bucks PA- 605 PM EDT THU JUL 13 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR EAST CENTRAL MONTGOMERY AND CENTRAL BUCKS COUNTIES... At 605 PM EDT, a severe thunderstorm was located over Hatfield, or 19 miles north of Philadelphia, moving northeast at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Lansdale, Doylestown, Hatboro, Souderton, Ambler, Chalfont, Hatfield, Ivyland, Fricks, Richboro, Willow Grove, Horsham, Telford, North Wales, New Britain, Warminster Heights, Maple Glen, Brittany Farms-Highlands, Spring House and Montgomeryville. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4038 7512 4018 7499 4014 7525 4031 7537 TIME...MOT...LOC 2205Z 247DEG 23KT 4027 7527 HAIL...<.75IN WIND...60MPH $$ MWG
The 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, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 40 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, 5:56 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 |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.