Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 207, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2024, 4:41 PM EDT for Monroe County, Northampton County, Pennsylvania; Sussex County, Warren County, New Jersey. It was in force for 34 min. 2 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 18, 2024, 4:41 PM EDT (20:41 UTC)
- Expired
- Aug 18, 2024, 5:15 PM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 20:40 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 18, 4:48 PM EDT | TSTM WND DMG | Hardwick Twp, NJ | A few trees down near Hardwick Township. Time estimated from radar. |
| Aug 18, 5:05 PM EDT | TSTM WND DMG | 1 Ene Hardwick Twp, NJ | Downed tree at the intersection of Butler Rd and Sunset Lake Rd. |
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 18, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 178 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
- 109 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
765
WUUS51 KPHI 182041
SVRPHI
NJC037-041-PAC089-095-182130-
/O.NEW.KPHI.SV.W.0207.240818T2041Z-240818T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
441 PM EDT Sun Aug 18 2024
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Western Sussex County in northwestern New Jersey...
Central Warren County in northwestern New Jersey...
East central Monroe County in northeastern Pennsylvania...
East central Northampton County in eastern Pennsylvania...
* Until 530 PM EDT.
* At 440 PM EDT, severe thunderstorms were located along a line
extending from near Bushkill to near Columbia to near Harmony,
moving northeast at 15 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Blairstown, Belvidere, Harmony, Oxford, Hope, Tatamy,
Flatbrookville, Brass Castle, Pleasant Valley, Werry Lake,
Millbrook, Roxburg, Five Points, Columbia, Crandon Lakes, Echo
Lake, Hainesville, Great Meadows-Vienna, Portland, and Hidden Lake.
This includes Interstate 80 in New Jersey between mile markers 4 and
16.
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 4131 7477 4099 7484 4072 7503 4072 7527
4091 7511 4110 7505 4108 7503 4109 7500
4116 7490 4127 7484
TIME...MOT...LOC 2040Z 245DEG 12KT 4113 7498 4094 7505 4074 7519
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS3 follow-up statements
616
WWUS51 KPHI 182059
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
459 PM EDT Sun Aug 18 2024
PAC089-182109-
/O.CAN.KPHI.SV.W.0207.000000T0000Z-240818T2130Z/
Monroe PA-
459 PM EDT Sun Aug 18 2024
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.
LAT...LON 4099 7484 4072 7503 4072 7513 4105 7503
4110 7497 4109 7499 4116 7490 4122 7486
4125 7479
TIME...MOT...LOC 2059Z 255DEG 14KT 4112 7495 4094 7499 4074 7506
$$
NJC037-041-PAC095-182130-
/O.CON.KPHI.SV.W.0207.000000T0000Z-240818T2130Z/
Sussex NJ-Warren NJ-Northampton PA-
459 PM EDT Sun Aug 18 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHWESTERN SUSSEX...CENTRAL WARREN AND EAST CENTRAL NORTHAMPTON
COUNTIES...
At 459 PM EDT, severe thunderstorms were located along a line
extending from Flatbrookville to near Hope to near Pleasant Valley,
moving east at 15 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Blairstown, Belvidere, Oxford, Hope, Flatbrookville, Brass Castle,
Roxburg, Five Points, Crandon Lakes, Pleasant Valley, Millbrook, and
Great Meadows-Vienna.
This includes Interstate 80 in New Jersey between mile markers 6 and
16.
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 4099 7484 4072 7503 4072 7513 4105 7503
4110 7497 4109 7499 4116 7490 4122 7486
4125 7479
TIME...MOT...LOC 2059Z 255DEG 14KT 4112 7495 4094 7499 4074 7506
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS051
WWUS51 KPHI 182106
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
506 PM EDT Sun Aug 18 2024
PAC095-182116-
/O.CAN.KPHI.SV.W.0207.000000T0000Z-240818T2130Z/
Northampton PA-
506 PM EDT Sun Aug 18 2024
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL NORTHAMPTON
COUNTY IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northwestern New Jersey...and northeastern Pennsylvania.
LAT...LON 4072 7507 4092 7503 4107 7501 4110 7497
4110 7498 4116 7490 4122 7486 4125 7479
4099 7484 4072 7503
TIME...MOT...LOC 2106Z 246DEG 13KT 4112 7494 4094 7497 4074 7505
$$
NJC037-041-182130-
/O.CON.KPHI.SV.W.0207.000000T0000Z-240818T2130Z/
Sussex NJ-Warren NJ-
506 PM EDT Sun Aug 18 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHWESTERN SUSSEX AND NORTHEASTERN WARREN COUNTIES...
At 506 PM EDT, severe thunderstorms were located along a line
extending from near Flatbrookville to near Hope to near Pleasant
Valley, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Blairstown, Oxford, Hope, Flatbrookville, Brass Castle, Five Points,
Crandon Lakes, Pleasant Valley, Millbrook, and Great Meadows-Vienna.
This includes Interstate 80 in New Jersey between mile markers 9 and
16.
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 4072 7507 4092 7503 4107 7501 4110 7497
4110 7498 4116 7490 4122 7486 4125 7479
4099 7484 4072 7503
TIME...MOT...LOC 2106Z 246DEG 13KT 4112 7494 4094 7497 4074 7505
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS540
WWUS51 KPHI 182115
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
515 PM EDT Sun Aug 18 2024
NJC037-041-182125-
/O.CAN.KPHI.SV.W.0207.000000T0000Z-240818T2130Z/
Sussex NJ-Warren NJ-
515 PM EDT Sun Aug 18 2024
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX AND
NORTHEASTERN WARREN COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northwestern New Jersey...and northeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4072 7507 4092 7503 4107 7501 4110 7497
4110 7498 4116 7490 4122 7486 4125 7479
4099 7484 4072 7503
TIME...MOT...LOC 2111Z 245DEG 12KT 4113 7492 4095 7495 4075 7503
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:35 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 18, 3:09 AM EDT | Flash Flood Warning | PHI | Bucks | 93 min |
| Aug 18, 3:24 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 19 min |
| Aug 18, 3:34 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 41 min |
| Aug 18, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 42 min |
| Aug 18, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 41 min |
| Aug 18, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 28 min |
| Aug 18, 4:56 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Aug 18, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 39 min |
| Aug 18, 5:31 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 6 hr |
| Aug 18, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 58 min |
| Aug 18, 4:41 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Mercer | 2 hr |
| Aug 18, 2:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Aug 18, 2:42 PM EDT | Special Marine Warning | PHI | 93 min | |
| Aug 18, 3:55 PM EDT | Special Marine Warning | PHI | 95 min | |
| Aug 18, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Warren | 29 min |
| Aug 18, 5:38 PM EDT | Flash Flood Warning | PHI | Sussex, Warren | 4 hr |
| Aug 18, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 43 min |
| Aug 18, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset | 24 min |
| Aug 18, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 18 min |
| Aug 18, 6:01 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 6 hr |
| Aug 18, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 66 min |
| Aug 18, 6:36 PM EDT | Flash Flood Warning | PHI | Morris, Somerset | 5 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2024Severe Thunderstorm Warnings in New Jersey, 2024Every severe thunderstorm warning in 2024
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.