Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 195, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 5, 2017, 5:49 PM EDT for 5 counties in Pennsylvania. It was in force for 41 min. 7 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
- Sep 5, 2017, 5:49 PM EDT (21:49 UTC)
- Expired
- Sep 5, 2017, 6:30 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 111 km from the middle of the area, began a volume at 21:53 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 |
|---|---|---|---|
| Sep 5, 5:50 PM EDT | TSTM WND DMG | Amityville, PA | DOWNED TREES AND POWER LINES CLOSED A STRETCH OF ROUTE 662 IN AMITY TOWNSHIP. TIME ESTIMATED FROM RADAR. |
| Sep 5, 5:54 PM EDT | TSTM WND DMG | 3 Ne Cedarville, PA | LARGE TREE LIMBS DOWN AND SHINGLES BLOWN OFF SOME HOUSES IN THE POTTSTOWN AREA. |
| Sep 5, 5:54 PM EDT | TSTM WND DMG | Pottstown, PA | TWO POLES AND ALSO TREES DOWN BLOCKING SOME ROADWAYS. |
| Sep 5, 5:54 PM EDT | HAIL 0.75 | Pottstown, PA | PENNY SIZE HAIL REPORTED. |
| Sep 5, 5:54 PM EDT | HAIL 1 | Pottstown, PA | QUARTER SIZED HAIL ALONG WITH LARGE BRANCHES AND SHINGLES BLOWN OFF ROOF. |
| Sep 5, 5:56 PM EDT | TSTM WND DMG | Hereford, PA | DOWNED TREES BLOCKING ROUTE 100 NEAR CHESTNUT STREET IN HEREFORD TOWNSHIP. |
| Sep 5, 6:04 PM EDT | TSTM WND DMG | 2 W Green Lane, PA | TREES AND POWER LINES DOWN NEAR BECKER AND WOODLAND ROADS IN UPPER FREDERICK TOWNSHIP. |
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 |
|---|---|---|---|
| Sep 5, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 211 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
- 217 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 902 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted.
735
WUUS51 KPHI 052149
SVRPHI
PAC011-017-077-091-095-052230-
/O.NEW.KPHI.SV.W.0195.170905T2149Z-170905T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
549 PM EDT TUE SEP 5 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Eastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Northampton County in eastern Pennsylvania...
* Until 630 PM EDT
* At 548 PM EDT, severe thunderstorms were located along a line
extending from near Coffeetown to near Fleetwood to near Birdsboro,
moving east-northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Allentown, Reading, Easton, Bethlehem, Pottstown, Forks, Emmaus,
Northampton, Quakertown, Perkasie, Wilson, Souderton, Bedminster,
Hellertown, Nazareth, Birdsboro, Kutztown, Slatington, Fleetwood
and Chalfont.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4079 7556 4086 7528 4081 7519 4076 7518
4074 7519 4073 7518 4070 7520 4061 7520
4057 7519 4056 7516 4028 7515 4022 7589
4052 7598
TIME...MOT...LOC 2148Z 252DEG 40KT 4061 7559 4043 7576 4024 7577
HAIL...0.75IN
WIND...60MPH
$$
JRK3 follow-up statements
311
WWUS51 KPHI 052200
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
600 PM EDT TUE SEP 5 2017
PAC011-017-077-091-095-052230-
/O.CON.KPHI.SV.W.0195.000000T0000Z-170905T2230Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
600 PM EDT TUE SEP 5 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR EASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...NORTHWESTERN
BUCKS AND NORTHAMPTON COUNTIES...
At 559 PM EDT, severe thunderstorms were located along a line
extending from Northampton to near Bally to near Pottstown, moving
east at 45 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.
These severe storms will be near...
Northampton, Bath, Lehigh University, Beersville and Geryville
around 605 PM EDT.
Allentown, Bethlehem, Emmaus and Steuben around 610 PM EDT.
Forks, Wilson, Nazareth, Belfast, West Easton, Tatamy, Glendon and
Old Orchard around 615 PM EDT.
Easton, Quakertown, Souderton, Hellertown, Hatfield and Pleasant
Valley around 620 PM EDT.
Perkasie, Springtown and Fricks around 625 PM EDT.
Bedminster, Chalfont, Dublin, Ferndale, Riegelsville, Revere and
Ottsville around 630 PM EDT.
Other locations impacted by these severe thunderstorms include
Harleysville, Boyertown, Pottsgrove, Hokendauqua, South Pottstown,
Stockertown, Red Hill, Amity Gardens, Eastlawn Gardens and North
Catasauqua.
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.
&&
LAT...LON 4077 7555 4082 7546 4086 7528 4081 7519
4076 7518 4074 7519 4073 7518 4070 7520
4061 7520 4057 7519 4056 7516 4028 7515
4023 7573 4051 7582 4064 7571
TIME...MOT...LOC 2159Z 251DEG 40KT 4066 7548 4047 7561 4028 7562
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
JRK633
WWUS51 KPHI 052219
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
619 PM EDT TUE SEP 5 2017
PAC011-052227-
/O.CAN.KPHI.SV.W.0195.000000T0000Z-170905T2230Z/
Berks PA-
619 PM EDT TUE SEP 5 2017
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BERKS COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 900 PM EDT for
northwestern New Jersey...and eastern and southeastern Pennsylvania.
LAT...LON 4081 7519 4078 7518 4060 7520 4057 7519
4056 7516 4028 7515 4025 7551 4025 7552
4043 7554 4045 7553 4046 7555 4058 7557
4080 7549 4086 7527
TIME...MOT...LOC 2217Z 251DEG 40KT 4081 7531 4052 7539 4033 7540
$$
PAC017-077-091-095-052230-
/O.CON.KPHI.SV.W.0195.000000T0000Z-170905T2230Z/
Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
619 PM EDT TUE SEP 5 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTH CENTRAL MONTGOMERY...SOUTHEASTERN LEHIGH...NORTHWESTERN
BUCKS AND NORTHAMPTON COUNTIES...
At 617 PM EDT, severe thunderstorms were located along a line
extending from near Wind Gap to near Hellertown to near Green Lane,
moving east at 45 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Doppler radar and trained weather spotters. These storms
have produced wind damage across Berks and upper portions
of Montgomery County.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
These severe storms will be near...
Nazareth, Wind Gap, Belfast and Tatamy around 620 PM EDT.
Pleasant Valley and Springtown around 625 PM EDT.
Bedminster, Chalfont, Dublin, Ferndale, West Easton, Riegelsville,
Glendon, Revere, Ottsville and Old Orchard around 630 PM EDT.
Other locations impacted by these severe thunderstorms include
Harleysville, Chapman, Coopersburg, Coplay, Sellersville, Fountain
Hill, Fullerton, Hokendauqua, Richlandtown and Stockertown.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4081 7519 4078 7518 4060 7520 4057 7519
4056 7516 4028 7515 4025 7551 4025 7552
4043 7554 4045 7553 4046 7555 4058 7557
4080 7549 4086 7527
TIME...MOT...LOC 2217Z 251DEG 40KT 4081 7531 4052 7539 4033 7540
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
JRK202
WWUS51 KPHI 052228
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
628 PM EDT TUE SEP 5 2017
PAC017-077-091-095-052237-
/O.EXP.KPHI.SV.W.0195.000000T0000Z-170905T2230Z/
Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
628 PM EDT TUE SEP 5 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MONTGOMERY...
SOUTHEASTERN LEHIGH...NORTHWESTERN BUCKS AND NORTHAMPTON COUNTIES
WILL EXPIRE AT 630 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire. However gusty winds
and heavy rain are still possible with these thunderstorms.
A severe thunderstorm watch remains in effect until 900 PM EDT for
northwestern New Jersey...and eastern and southeastern Pennsylvania.
LAT...LON 4081 7519 4078 7518 4060 7520 4057 7519
4056 7516 4028 7515 4025 7551 4025 7552
4043 7554 4045 7553 4046 7555 4058 7557
4080 7549 4086 7527
TIME...MOT...LOC 2227Z 252DEG 40KT 4084 7519 4055 7527 4036 7528
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 3:59 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 31 min |
| Sep 5, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 52 min |
| Sep 5, 4:34 PM EDT | Areal Flood Advisory | PHI | Berks | 6 hr |
| Sep 5, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 51 min |
| Sep 5, 5:14 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Sep 5, 5:19 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 56 min |
| Sep 5, 5:22 PM EDT | Areal Flood Advisory | PHI | Northampton | 4 hr |
| Sep 5, 5:30 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Sep 5, 6:03 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 3 hr |
| Sep 5, 6:19 PM EDT | Special Weather Statement | PHI | Chester, Delaware | 41 min |
| Sep 5, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 49 min |
| Sep 5, 6:44 PM EDT | Special Weather Statement | PHI | Bucks | 31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.