Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 177, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2017, 9:00 PM EDT for 7 counties in Pennsylvania. It was in force for 60 min. 3 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
- Aug 19, 2017, 9:00 PM EDT (01:00 UTC)
- Expired
- Aug 19, 2017, 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 Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 01:02 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 |
|---|---|---|---|
| Aug 19, 9:03 PM EDT | TSTM WND DMG | Amity Twp, PA | TREES AND WIRES BLOWN DOWN. TIME ESITMATED FROM RADAR. |
| Aug 19, 9:17 PM EDT | TSTM WND GST 46 | S Allentown, PA | |
| Aug 19, 9:23 PM EDT | TSTM WND GST 44 | Lehigh Valley Intl Airp, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 1.0 hours before the alert went out and 207 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
- 149 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1304 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
636
WUUS51 KPHI 200100
SVRPHI
PAC011-017-025-077-089-091-095-200200-
/O.NEW.KPHI.SV.W.0177.170820T0100Z-170820T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
900 PM EDT SAT AUG 19 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...
Southeastern Carbon County in northeastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Southern Monroe County in northeastern Pennsylvania...
Northampton County in eastern Pennsylvania...
* Until 1000 PM EDT
* At 859 PM EDT, severe thunderstorms were located along a line
extending from near Jordan Valley to near Claussville to near
Fleetwood to near New Morgan, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Allentown, Easton, Lehighton, Bethlehem, Pottstown, Forks, Emmaus,
Northampton, East Stroudsburg, Quakertown, Perkasie, Wilson,
Bedminster, Hellertown, Nazareth, Palmerton, Bangor, Birdsboro,
Kutztown and Jim Thorpe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 7503 4109 7497 4098 7514 4086 7505
4085 7510 4080 7510 4075 7519 4068 7517
4057 7519 4058 7512 4054 7507 4044 7507
4017 7593 4020 7596 4054 7578 4069 7584
4074 7576 4081 7587 4114 7508
TIME...MOT...LOC 0059Z 236DEG 42KT 4074 7574 4058 7571 4042 7579 4021
7590
HAIL...<.75IN
WIND...60MPH
$$
Iovino2 follow-up statements
025
WWUS51 KPHI 200116
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
916 PM EDT SAT AUG 19 2017
PAC011-017-025-077-089-091-095-200200-
/O.CON.KPHI.SV.W.0177.000000T0000Z-170820T0200Z/
Berks PA-Montgomery PA-Lehigh PA-Carbon PA-Bucks PA-Monroe PA-
Northampton PA-
916 PM EDT SAT AUG 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR EASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...SOUTHEASTERN
CARBON...NORTHWESTERN BUCKS...SOUTHERN MONROE AND NORTHAMPTON
COUNTIES...
At 915 PM EDT, severe thunderstorms were located along a line
extending from Beltzville State Park to Coffeetown to Ancient Oaks to
near Birdsboro, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Allentown, Easton, Lehighton, Bethlehem, Pottstown, Forks, Emmaus,
Northampton, East Stroudsburg, Quakertown, Perkasie, Wilson,
Bedminster, Hellertown, Nazareth, Palmerton, Bangor, Birdsboro,
Kutztown and Jim Thorpe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 7503 4109 7497 4098 7514 4086 7505
4085 7510 4080 7510 4075 7519 4068 7517
4057 7519 4058 7512 4054 7507 4044 7507
4021 7582 4038 7587 4054 7578 4069 7584
4074 7576 4081 7587 4114 7508
TIME...MOT...LOC 0115Z 236DEG 41KT 4087 7564 4065 7555 4051 7561 4030
7572
HAIL...<.75IN
WIND...60MPH
$$
Iovino388
WWUS51 KPHI 200134
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
934 PM EDT SAT AUG 19 2017
PAC011-025-200143-
/O.CAN.KPHI.SV.W.0177.000000T0000Z-170820T0200Z/
Berks PA-Carbon PA-
934 PM EDT SAT AUG 19 2017
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BERKS AND SOUTHEASTERN
CARBON COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of Berks County
and Carbon County. Therefore, the warning has been cancelled for
those counties.
LAT...LON 4108 7503 4109 7497 4098 7514 4086 7505
4085 7510 4080 7510 4075 7519 4068 7520
4068 7517 4061 7520 4057 7518 4058 7512
4054 7507 4044 7507 4028 7560 4044 7553
4065 7549 4083 7548 4095 7550 4114 7508
TIME...MOT...LOC 0133Z 236DEG 42KT 4097 7544 4075 7535 4061 7541 4040
7553
$$
PAC017-077-089-091-095-200200-
/O.CON.KPHI.SV.W.0177.000000T0000Z-170820T0200Z/
Montgomery PA-Lehigh PA-Bucks PA-Monroe PA-Northampton PA-
934 PM EDT SAT AUG 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR NORTHWESTERN MONTGOMERY...SOUTHEASTERN LEHIGH...NORTHWESTERN
BUCKS...SOUTHERN MONROE AND NORTHAMPTON COUNTIES...
At 933 PM EDT, severe thunderstorms were located along a line
extending from Sun Valley to near Nazareth to Lehigh University to
East Greenville, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, East
Stroudsburg, Quakertown, Perkasie, Wilson, Bedminster, Hellertown,
Nazareth, Bangor, Tinicum, Pen Argyl, East Greenville, Wind Gap, Bath
and Ferndale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 7503 4109 7497 4098 7514 4086 7505
4085 7510 4080 7510 4075 7519 4068 7520
4068 7517 4061 7520 4057 7518 4058 7512
4054 7507 4044 7507 4028 7560 4044 7553
4065 7549 4083 7548 4095 7550 4114 7508
TIME...MOT...LOC 0133Z 236DEG 42KT 4097 7544 4075 7535 4061 7541 4040
7553
HAIL...<.75IN
WIND...60MPH
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:01 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 59 min |
| Aug 19, 8:34 PM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Montgomery | 56 min |
| Aug 19, 9:29 PM EDT | Special Weather Statement | PHI | Monroe | 31 min |
| Aug 19, 9:35 PM EDT | Special Weather Statement | PHI | Bucks, Delaware, Montgomery, Philadelphia | 25 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.