Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 17, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 15, 2018, 4:41 PM EDT for 6 counties in Pennsylvania; 6 counties in New Jersey. It was in force for 64 min. 32 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
- May 15, 2018, 4:41 PM EDT (20:41 UTC)
- Expired
- May 15, 2018, 5:45 PM EDT
- In force
- 64 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 20:44 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 |
|---|---|---|---|
| May 15, 4:41 PM EDT | TSTM WND DMG | Lake Parsippany, NJ | DOWNED TREE ON INTERSTATE 287 NEAR EXIT 40. LANE CLOSURES IN PLACE. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:41 PM EDT | TSTM WND DMG | Tabor, NJ | DOWNED TREE ON STATE HIGHWAY 53 NEAR FRONT STREET IN DENVILLE TWP. ALL LANES CLOSED. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:42 PM EDT | TSTM WND DMG | Boonton, NJ | TREES DOWN THROUGHOUT BOONTON. SEVERAL ROADS CLOSED. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:42 PM EDT | TSTM WND DMG | Littleton, NJ | DOWNED TREE ON U.S. HIGHWAY 202 NEAR STATE HIGHWAY 10 IN MORRIS PLAINS. ALL LANES CLOSED AND DETOURED. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:45 PM EDT | TSTM WND DMG | Lake Hiawatha, NJ | LARGE TREE DOWN CRUSHING 2 CARS |
| May 15, 4:45 PM EDT | TSTM WND GST 68 | Lower Macungie Twp, PA | WIND GUST OF 68 MPH MEASURED WITH HAND HELD ANEMOMETER...HOWEVER THE DEVICE HAD NOT BEEN CALIBRATED RECENTLY. TREE DAMAGE ALSO REPORTED |
| May 15, 4:46 PM EDT | TSTM WND DMG | Pohatcong Twp, NJ | NUMEROUS TREES, POWER LINES, AND UTILITY POLES DOWN THROUGHOUT POHATCONG TWP. SEVERAL ROAD CLOSURES IN PLACE. |
| May 15, 4:46 PM EDT | TSTM WND GST 55 | 1 S Ruscomb Manor Twp, PA | CWOP STATION REPORTS WIND GUST OF 55 MPH |
| May 15, 4:49 PM EDT | TSTM WND DMG | Malapardis, NJ | DOWNED TREE ON INTERSTATE 287 NEAR EXIT 39. LANE CLOSURES IN PLACE. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:51 PM EDT | TSTM WND DMG | Hampton, NJ | MULTIPLE TREES AND POWER LINES DOWN. TIME ESTIMATED FROM RADAR. |
| May 15, 4:51 PM EDT | TSTM WND DMG | Pine Brook, NJ | NUMEROUS TREES DOWN IN PINE BROOK. SEVERAL ROADS ARE CLOSED. TIME APPROXIMATED FROM RADAR. |
| May 15, 4:55 PM EDT | TSTM WND DMG | Wyomissing, PA | 6 INCH DIAMTER TREE SNAPPED AT THE BASE. TIME ESTIMATED FROM RADAR |
| May 15, 4:57 PM EDT | TSTM WND DMG | West Reading, PA | TREE DOWN ON A HOUSE. NO INJURIES REPORTED. TIME ESTIMATED FROM RADAR. |
| May 15, 4:59 PM EDT | TSTM WND DMG | College Heights, PA | DOWNED TREES ON SKYLINE DRIVE NEAR MCKNIGHT GAP ROAD. TIME ESTIMATED FROM RADAR. |
| May 15, 4:59 PM EDT | HAIL 1 | Bally, PA | |
| May 15, 5:00 PM EDT | TSTM WND GST 60 | West Lawn, PA | LARGE TREE DOWN IN PICTURE. |
| May 15, 5:00 PM EDT | TSTM WND GST 67 | Lebanon, NJ | |
| May 15, 5:02 PM EDT | TSTM WND DMG | Pennside, PA | DOWNED TREE DAMAGED A HOUSE. TIME ESTIMATED FROM RADAR. |
| May 15, 5:04 PM EDT | TSTM WND DMG | Oley Twp, PA | NUMEROUS TREES DOWN IN OLEY TOWNSHIP, WITH SEVERAL ROADS CLOSED. TIME ESTIMATED FROM RADAR. |
| May 15, 5:07 PM EDT | TSTM WND DMG | West Rockhill Twp, PA | FALLEN TREES DAMAGED A HOUSE IN WEST ROCKHILL TWP. TIME ESTIMATED FROM RADAR. |
| May 15, 5:10 PM EDT | TSTM WND DMG | Douglassville, PA | TREES AND POWERLINES DOWN. |
| May 15, 5:13 PM EDT | TSTM WND GST 64 | Port Reading, NJ | |
| May 15, 5:14 PM EDT | TSTM WND DMG | 1 N Snowdenville, PA | REPORT OF TREES AND POWER LINES DOWN NEAR THE INTERSECTION OF SAYLORS MILL RD AND EBELHARE RD |
| May 15, 5:16 PM EDT | TSTM WND GST 81 | Pottstown, PA | MEASURED BY HOME ROOFTOP WEATHER STATION. TREE DAMAGE AND ALSO SOME WINDOW DAMAGE TO A HOME. PROBABLE MICROBURST. |
| May 15, 5:17 PM EDT | HAIL 1 | Pottstown, PA | QUARTER SIZE HAIL LASTED FOR 8 MINUTES. |
| May 15, 5:19 PM EDT | HAIL 1 | Pottstown, PA | REPORT RELAYED VIA BROADCAST MEDIA THAT QUARTER SIZE HAIL FELL IN POTTSTOWN FOR AT LEAST 8 MINUTES. TIME ESTIAMTE FROM RADAR |
| May 15, 5:20 PM EDT | HAIL 0.75 | Stowe, PA | |
| May 15, 5:25 PM EDT | TSTM WND DMG | Phoenixville, PA | TREE DOWN ON BRIDGE STREET. TIME ESTIMATED FROM RADAR |
| May 15, 5:32 PM EDT | TSTM WND DMG | Graterford, PA | LARGE LIMB AND POWER LINES DOWN IN NEIGHBORHOOD. *EVENT TIME CORRECTED* |
| May 15, 5:48 PM EDT | TSTM WND DMG | 1 Wnw Rushland, PA | LARGE TREES UPROOTED NEAR SWAMP ROAD AND RUSHLAND ROAD IN JAMISON. TIME ESTIMATED FROM RADAR. |
| May 15, 5:54 PM EDT | TSTM WND DMG | Plymouth Valley, PA | LARGE TREE DOWN, DAMAGING A RESIDENTIAL PROPERTY, ON MILL CREEK ROAD. TIME ESTIMATED BY RADAR. |
| May 15, 5:55 PM EDT | TSTM WND DMG | Plymouth Meadows, PA | SEVERAL TREES DOWN ON MALVERN ROAD. |
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 |
|---|---|---|---|
| May 15, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 142 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 909 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
060
WUUS51 KPHI 152041
SVRPHI
NJC019-021-023-027-035-041-PAC011-017-029-077-091-095-152145-
/O.NEW.KPHI.SV.W.0017.180515T2041Z-180515T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
441 PM EDT TUE MAY 15 2018
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Morris County in northern New Jersey...
Hunterdon County in northwestern New Jersey...
Southwestern Warren County in northwestern New Jersey...
Northwestern Mercer County in central New Jersey...
Somerset County in northern New Jersey...
Northern Middlesex County in northern New Jersey...
Southeastern Berks County in eastern Pennsylvania...
Montgomery County in southeastern Pennsylvania...
Southeastern Lehigh County in eastern Pennsylvania...
Bucks County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
Southeastern Northampton County in eastern Pennsylvania...
* Until 545 PM EDT.
* At 441 PM EDT, severe thunderstorms were located along a line
extending from near Hawthorne to Spring Ridge, moving east at 55
mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Locations impacted include...
Allentown, Reading, New Brunswick, Perth Amboy, Morristown,
Somerville, Somerset, Edison, Bethlehem, East Brunswick,
Bridgewater, South Brunswick, Sayreville, North Brunswick, Ewing,
Norristown, Carteret, Pottstown, Dover and Phoenixville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
4046 7426 4013 7527 4003 7572 4032 7614
4100 7430 4097 7428 4090 7427 4091 7433
4083 7433 4076 7438 4075 7436 4067 7446
4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 2041Z 284DEG 42KT 4100 7418 4034 7598
HAIL...1.00IN
WIND...70MPH
$$
po2 follow-up statements
805
WWUS51 KPHI 152110
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
510 PM EDT TUE MAY 15 2018
NJC019-021-023-027-035-041-PAC011-017-029-077-091-095-152145-
/O.CON.KPHI.SV.W.0017.000000T0000Z-180515T2145Z/
Morris NJ-Hunterdon NJ-Warren NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
510 PM EDT TUE MAY 15 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR MORRIS...HUNTERDON...SOUTHWESTERN WARREN...NORTHWESTERN MERCER...
SOMERSET...NORTHERN MIDDLESEX...SOUTHEASTERN BERKS...MONTGOMERY...
SOUTHEASTERN LEHIGH...BUCKS...NORTHEASTERN CHESTER AND SOUTHEASTERN
NORTHAMPTON COUNTIES...
At 510 PM EDT, severe thunderstorms were located along a line
extending from New York to near Glenmoore, moving southeast at 25
mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Allentown, Reading, New Brunswick, Perth Amboy, Morristown,
Somerville, Somerset, Edison, Bethlehem, East Brunswick, Bridgewater,
South Brunswick, Sayreville, North Brunswick, Ewing, Norristown,
Carteret, Pottstown, Dover and Phoenixville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
4046 7426 4013 7527 4003 7572 4032 7614
4100 7430 4097 7428 4090 7427 4091 7433
4083 7433 4076 7438 4075 7436 4067 7446
4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 2110Z 322DEG 23KT 4078 7396 4012 7575
HAIL...1.00IN
WIND...70MPH
$$
SFJ975
WWUS51 KPHI 152127
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
527 PM EDT TUE MAY 15 2018
NJC041-PAC077-095-152136-
/O.CAN.KPHI.SV.W.0017.000000T0000Z-180515T2145Z/
Warren NJ-Lehigh PA-Northampton PA-
527 PM EDT TUE MAY 15 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN...
SOUTHEASTERN LEHIGH AND SOUTHEASTERN NORTHAMPTON COUNTIES 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 1100 PM EDT for
central, northern and northwestern New Jersey...and eastern and
southeastern Pennsylvania.
LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
4046 7426 4013 7527 4003 7572 4025 7604
4075 7436 4067 7446 4065 7440 4060 7446
4060 7421
TIME...MOT...LOC 2126Z 284DEG 42KT 4074 7374 4008 7554
$$
NJC019-021-023-027-035-PAC011-017-029-091-152145-
/O.CON.KPHI.SV.W.0017.000000T0000Z-180515T2145Z/
Morris NJ-Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Berks PA-
Montgomery PA-Bucks PA-Chester PA-
527 PM EDT TUE MAY 15 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN MORRIS...SOUTHEASTERN HUNTERDON...NORTHWESTERN
MERCER...SOMERSET...NORTHERN MIDDLESEX...SOUTHEASTERN BERKS...
MONTGOMERY...BUCKS AND NORTHEASTERN CHESTER COUNTIES...
At 526 PM EDT, severe thunderstorms were located along a line
extending from near Little Neck to near Paoli, moving east at 50 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, East
Brunswick, Bridgewater, South Brunswick, Sayreville, North Brunswick,
Ewing, Norristown, Carteret, Pottstown, Phoenixville, Lansdale, West
Norriton, Middlesex, East Norriton and Princeton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
4046 7426 4013 7527 4003 7572 4025 7604
4075 7436 4067 7446 4065 7440 4060 7446
4060 7421
TIME...MOT...LOC 2126Z 284DEG 42KT 4074 7374 4008 7554
HAIL...1.00IN
WIND...70MPH
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 3:40 AM EDT | Flash Flood Watch | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 21 hr |
| May 15, 2:49 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 56 min |
| May 15, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 55 min |
| May 15, 3:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 74 min |
| May 15, 4:12 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 33 min |
| May 15, 4:24 PM EDT | Special Weather Statement | PHI | Berks | 51 min |
| May 15, 4:26 PM EDT | Tornado Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 19 min |
| May 15, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 63 min |
| May 15, 5:14 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 2 hr |
| May 15, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 38 min |
| May 15, 5:31 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Montgomery | 3 hr |
| May 15, 5:35 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| May 15, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 67 min |
| May 15, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 52 min |
| May 15, 6:10 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 4 hr |
| May 15, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 60 min |
| May 15, 6:35 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 40 min |
| May 15, 6:58 PM EDT | Areal Flood Advisory | PHI | Chester | 4 hr |
| May 15, 4:49 PM EDT | Special Marine Warning | PHI | 86 min | |
| May 15, 6:02 PM EDT | Special Marine Warning | PHI | 88 min | |
| May 15, 6:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| May 15, 6:17 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Cumberland, Gloucester, Ocean | 43 min |
| May 15, 6:46 PM EDT | Special Weather Statement | PHI | Atlantic, Cumberland, Ocean, Salem | 74 min |
| May 15, 7:14 PM EDT | Special Marine Warning | PHI | 91 min | |
| May 15, 7:18 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 57 min |
| May 15, 7:30 PM EDT | Special Marine Warning | PHI | 90 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2018Severe Thunderstorm Warnings in New Jersey, 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.