Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 82, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2018, 7:09 PM EDT for 8 counties in Pennsylvania. It was in force for 51 min. 4 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 17, 2018, 7:09 PM EDT (23:09 UTC)
- Expired
- Aug 17, 2018, 8:00 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 23:12 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 17, 7:12 PM EDT | TSTM WND DMG | Rextown, PA | TREE DOWN ON EAST GRANT STREET IN WASHINGTON TWP, FORCING THE TEMPORARY CLOSURE OF THE ROAD. TIME ESTIMATED FROM RADAR. |
| Aug 17, 7:22 PM EDT | TSTM WND DMG | 1 Wnw Hereford, PA | TREE DOWN AT SEISHOLTZVILLE ROAD AND CHICKADEE LANE. |
| Aug 17, 7:37 PM EDT | TSTM WND DMG | 1 Sse Kirchberg, PA | REPORT OF TREES DOWN IN LOWER SAUCON TWP. TIME ESTIMATED FROM RADAR. |
| Aug 17, 7:42 PM EDT | TSTM WND DMG | 1 Wnw Brookview, PA | TREE DOWN AT SAWMILL ROAD AND HAUSEMAN ROAD IN COLEBROOKDALE TWP. TIME ESTIMATED FROM RADAR. |
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 |
|---|---|---|---|
| Aug 17, 3:44 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.2 hours before the alert went out and 223 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
- 750 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
701
WUUS51 KPHI 172309
SVRPHI
PAC011-017-025-029-077-089-091-095-180000-
/O.NEW.KPHI.SV.W.0082.180817T2309Z-180818T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
709 PM EDT FRI AUG 17 2018
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...
Northeastern Chester County in southeastern Pennsylvania...
Southwestern Monroe County in northeastern Pennsylvania...
Southwestern Northampton County in eastern Pennsylvania...
* Until 800 PM EDT.
* At 708 PM EDT, severe thunderstorms were located along a line
extending from Lehighton to Jordan Valley to near Fleetwood to
Terre Hill, moving northeast at 35 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Allentown, Reading, Lehighton, Bethlehem, Pottstown, Phoenixville,
Emmaus, Wyomissing, Northampton, Quakertown, Hellertown, Nazareth,
Palmerton, Birdsboro, Kutztown, Jim Thorpe, Royersford, Slatington,
Fleetwood and Sinking Spring.
People attending Philadelphia Folk Festival should seek safe shelter
immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4070 7584 4074 7576 4079 7585 4085 7586
4104 7539 4058 7529 4036 7538 4010 7555
4009 7594 4011 7594 4014 7588 4025 7605
TIME...MOT...LOC 2308Z 224DEG 31KT 4084 7575 4073 7568 4041 7577 4013
7606
HAIL...<.75IN
WIND...70MPH
$$
CMS3 follow-up statements
884
WWUS51 KPHI 172327
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
727 PM EDT FRI AUG 17 2018
PAC011-017-025-029-077-089-091-095-180000-
/O.CON.KPHI.SV.W.0082.000000T0000Z-180818T0000Z/
Berks PA-Montgomery PA-Lehigh PA-Carbon PA-Bucks PA-Chester PA-
Monroe PA-Northampton PA-
727 PM EDT FRI AUG 17 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR EASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...SOUTHEASTERN
CARBON...NORTHWESTERN BUCKS...NORTHEASTERN CHESTER...SOUTHWESTERN
MONROE AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 726 PM EDT, severe thunderstorms were located along a line
extending from near Christmans to near Danielsville to near Ancient
Oaks to near New Morgan, moving northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Public. Several reports of wind damage have been received
from Berks County during the past half hour.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Allentown, Reading, Lehighton, Bethlehem, Pottstown, Phoenixville,
Emmaus, Wyomissing, Northampton, Quakertown, Hellertown, Nazareth,
Palmerton, Birdsboro, Kutztown, Jim Thorpe, Royersford, Slatington,
Fleetwood and Sinking Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4040 7598 4057 7577 4071 7582 4074 7576
4079 7585 4085 7586 4104 7539 4058 7529
4036 7538 4010 7555 4009 7594 4011 7594
4014 7588 4025 7605
TIME...MOT...LOC 2326Z 224DEG 31KT 4094 7562 4083 7555 4051 7564 4023
7593
HAIL...<.75IN
WIND...60MPH
$$
CMS801
WWUS51 KPHI 172336
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
736 PM EDT FRI AUG 17 2018
PAC011-017-025-029-077-089-091-095-180000-
/O.CON.KPHI.SV.W.0082.000000T0000Z-180818T0000Z/
Berks PA-Montgomery PA-Lehigh PA-Carbon PA-Bucks PA-Chester PA-
Monroe PA-Northampton PA-
736 PM EDT FRI AUG 17 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...
SOUTHEASTERN CARBON...NORTHWESTERN BUCKS...NORTHEASTERN CHESTER...
SOUTHWESTERN MONROE AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 735 PM EDT, severe thunderstorms were located along a line
extending from Meckesville to Kunkletown to near Emmaus to
Cedarville, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Public. Several reports of downed trees have been received
near Reading during the past half hour.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Allentown, Reading, Bethlehem, Pottstown, Phoenixville, Emmaus,
Wyomissing, Northampton, Quakertown, Hellertown, Nazareth, Palmerton,
Birdsboro, Kutztown, Royersford, Slatington, Fleetwood, Sinking
Spring, Laureldale and Trappe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4040 7598 4055 7570 4078 7559 4094 7563
4104 7539 4058 7529 4036 7538 4010 7555
4014 7588 4025 7605
TIME...MOT...LOC 2335Z 238DEG 36KT 4101 7553 4083 7545 4053 7544 4025
7570
HAIL...<.75IN
WIND...60MPH
$$
CMS127
WWUS51 KPHI 172352
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
752 PM EDT FRI AUG 17 2018
PAC011-017-025-029-077-089-091-095-180002-
/O.EXP.KPHI.SV.W.0082.000000T0000Z-180818T0000Z/
Berks PA-Montgomery PA-Lehigh PA-Carbon PA-Bucks PA-Chester PA-
Monroe PA-Northampton PA-
752 PM EDT FRI AUG 17 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS...
NORTHWESTERN MONTGOMERY...LEHIGH...SOUTHEASTERN CARBON...NORTHWESTERN
BUCKS...NORTHEASTERN CHESTER...SOUTHWESTERN MONROE AND SOUTHWESTERN
NORTHAMPTON COUNTIES WILL EXPIRE AT 800 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and are exiting the warned area. Therefore, the warning will
be allowed to expire. However gusty winds and heavy rain are still
possible with these thunderstorms.
A severe thunderstorm watch remains in effect until 1100 PM EDT for
eastern and northeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.
LAT...LON 4040 7598 4055 7570 4078 7559 4094 7563
4104 7539 4058 7529 4036 7538 4010 7555
4014 7588 4025 7605
TIME...MOT...LOC 2352Z 224DEG 31KT 4110 7541 4092 7533 4062 7532 4034
7558
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 2:21 PM EDT | Special Weather Statement | PHI | Lehigh | 24 min |
| Aug 17, 4:29 PM EDT | Special Weather Statement | PHI | Berks | 46 min |
| Aug 17, 5:07 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 53 min |
| Aug 17, 5:12 PM EDT | Special Weather Statement | PHI | Berks | 33 min |
| Aug 17, 5:36 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 39 min |
| Aug 17, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 31 min |
| Aug 17, 6:00 PM EDT | Special Weather Statement | PHI | Carbon | 30 min |
| Aug 17, 6:18 PM EDT | Special Weather Statement | PHI | Berks | 27 min |
| Aug 17, 6:19 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 41 min |
| Aug 17, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 38 min |
| Aug 17, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 52 min |
| Aug 17, 6:40 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 17, 7:15 PM EDT | Special Weather Statement | PHI | Pike | 15 min |
| Aug 17, 7:34 PM EDT | Special Weather Statement | PHI | Carbon | 26 min |
| Aug 17, 7:39 PM EDT | Special Weather Statement | PHI | Monroe | 51 min |
| Aug 17, 7:42 PM EDT | Special Weather Statement | PHI | Bucks, Northampton | 33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.