Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 286, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2019, 2:46 PM EDT for New Castle County, Delaware; 5 counties in Pennsylvania; Hunterdon County, Mercer County, New Jersey. It was in force for 44 min. 6 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
- Jul 31, 2019, 2:46 PM EDT (18:46 UTC)
- Expired
- Jul 31, 2019, 3:30 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 18:47 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 |
|---|---|---|---|
| Jul 31, 2:49 PM EDT | TSTM WND DMG | 2 Sse East Caln Twp, PA | REPORT OF TREES BLOWN DOWN. |
| Jul 31, 3:00 PM EDT | TSTM WND DMG | 2 Sw Skippack, PA | TREES DOWN. TIME ESTIMATED FROM RADAR. |
| Jul 31, 3:06 PM EDT | TSTM WND DMG | Paoli, PA | REPORT OF TREES BLOWN DOWN. |
| Jul 31, 3:24 PM EDT | TSTM WND DMG | 2 Ne Plymouth Meeting, PA | TREES BLOWN DOWN. |
| Jul 31, 3:24 PM EDT | TSTM WND DMG | Lafayette Hill, PA | LARGE TREE LIMBS DOWNED IN LAFAYETTE HILL. TIME ESTIMATED FROM RADAR. |
| Jul 31, 3:25 PM EDT | TSTM WND DMG | Lafayette Hill, PA | MULTIPLE TREES AND LIMBS DOWN. 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 |
|---|---|---|---|
| Jul 31, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.8 hours before the alert went out and 219 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
- 885 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1207 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted.
529
WUUS51 KPHI 311846
SVRPHI
DEC003-NJC019-021-PAC017-029-045-091-101-311930-
/O.NEW.KPHI.SV.W.0286.190731T1846Z-190731T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
246 PM EDT Wed Jul 31 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
North central New Castle County in northern Delaware...
Southeastern Hunterdon County in northwestern New Jersey...
Northwestern Mercer County in central New Jersey...
Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
Eastern Chester County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 330 PM EDT.
* At 246 PM EDT, severe thunderstorms were located along a line
extending from Ottsville to near Phoenixville to near Marshallton,
moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Wilmington, West Chester, Norristown, Phoenixville,
Lansdale, West Norriton, East Norriton, Westtown, Perkasie,
Doylestown, Byram, Downingtown, Conshohocken, Hatboro, Souderton,
Bedminster, Ambler, Kennett Square and Collegeville.
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.
&&
LAT...LON 4046 7477 4001 7523 3974 7557 3990 7588
4014 7563 4055 7518
TIME...MOT...LOC 1846Z 290DEG 18KT 4049 7516 4012 7556 3994 7575
HAIL...0.75IN
WIND...60MPH
$$
MPS2 follow-up statements
892
WWUS51 KPHI 311908
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
308 PM EDT Wed Jul 31 2019
DEC003-NJC019-021-PAC017-029-045-091-101-311930-
/O.CON.KPHI.SV.W.0286.000000T0000Z-190731T1930Z/
New Castle DE-Hunterdon NJ-Mercer NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
308 PM EDT Wed Jul 31 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTH CENTRAL NEW CASTLE...SOUTHEASTERN HUNTERDON...NORTHWESTERN
MERCER...MONTGOMERY...CENTRAL BUCKS...EASTERN CHESTER...NORTHWESTERN
PHILADELPHIA AND DELAWARE COUNTIES...
At 308 PM EDT, severe thunderstorms were located along a line
extending from near Byram to Valley Forge to near West Chester,
moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Wilmington, West Chester, Norristown, Phoenixville,
Lansdale, West Norriton, East Norriton, Westtown, Perkasie,
Doylestown, Byram, Downingtown, Conshohocken, Hatboro, Souderton,
Bedminster, Ambler, Swarthmore and Kennett Square.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3976 7554 3992 7586 3993 7585 4016 7558
4055 7518 4046 7477 4001 7523
TIME...MOT...LOC 1908Z 289DEG 18KT 4046 7504 4009 7544 3991 7563
HAIL...0.75IN
WIND...60MPH
$$
Fitzsimmons521
WWUS51 KPHI 311925
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
325 PM EDT Wed Jul 31 2019
DEC003-NJC019-021-PAC017-029-045-091-101-311934-
/O.EXP.KPHI.SV.W.0286.000000T0000Z-190731T1930Z/
New Castle DE-Hunterdon NJ-Mercer NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
325 PM EDT Wed Jul 31 2019
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL NEW CASTLE...
SOUTHEASTERN HUNTERDON...NORTHWESTERN MERCER...MONTGOMERY...CENTRAL
BUCKS...EASTERN CHESTER...NORTHWESTERN PHILADELPHIA AND DELAWARE
COUNTIES WILL EXPIRE AT 330 PM EDT...
A new Severe Thunderstorm Warning is now in effect. Please refer to
Warning 290 which is in effect until 4:15 PM.
A severe thunderstorm watch remains in effect until 900 PM EDT for
northern Delaware...central and northwestern New Jersey...and
southeastern 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 3976 7554 3992 7586 3993 7585 4016 7558
4055 7518 4046 7477 4001 7523
TIME...MOT...LOC 1924Z 290DEG 18KT 4044 7495 4007 7535 3989 7554
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:28 AM EDT | Flash Flood Watch | PHI | New Castle | 17 hr |
| Jul 31, 4:00 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
| Jul 31, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 9 min |
| Jul 31, 6:05 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 26 min |
| Jul 30, 10:45 PM EDT | Special Weather Statement | PHI | Berks | 45 min |
| Jul 30, 11:38 PM EDT | Special Weather Statement | PHI | Lehigh | 52 min |
| Jul 31, 12:06 AM EDT | Special Weather Statement | PHI | Carbon | 39 min |
| Jul 31, 1:02 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 28 min |
| Jul 31, 1:14 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 31, 1:19 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Philadelphia | 5 hr |
| Jul 31, 1:30 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 45 min |
| Jul 31, 1:46 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Jul 31, 2:11 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 49 min |
| Jul 31, 2:27 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 3 hr |
| Jul 31, 2:32 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 3 hr |
| Jul 31, 3:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 51 min |
| Jul 31, 3:49 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 41 min |
| Jul 31, 4:36 PM EDT | Areal Flood Advisory | PHI | Bucks, Monroe, Northampton | 4 hr |
| Jul 31, 4:52 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 38 min |
| Jul 31, 4:58 PM EDT | Flash Flood Warning | PHI | Monroe | 4 hr |
| Jul 31, 1:43 PM EDT | Special Marine Warning | PHI | 62 min | |
| Jul 31, 1:49 PM EDT | Special Marine Warning | PHI | 86 min | |
| Jul 31, 1:57 PM EDT | Special Weather Statement | PHI | Ocean | 33 min |
| Jul 31, 2:21 PM EDT | Areal Flood Advisory | PHI | Ocean | 4 hr |
| Jul 31, 2:23 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 52 min |
| Jul 31, 2:29 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 46 min |
| Jul 31, 2:29 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 46 min |
| Jul 31, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 52 min |
| Jul 31, 3:00 PM EDT | Areal Flood Advisory | PHI | Monmouth, Ocean | 3 hr |
| Jul 31, 3:05 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 40 min |
| Jul 31, 3:06 PM EDT | Special Marine Warning | PHI | 54 min | |
| Jul 31, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 40 min |
| Jul 31, 3:24 PM EDT | Flash Flood Warning | PHI | Monmouth | 4 hr |
| Jul 31, 3:39 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 4 hr |
| Jul 31, 3:39 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 51 min |
| Jul 31, 3:48 PM EDT | Flash Flood Warning | PHI | Ocean | 2 hr |
| Jul 31, 3:51 PM EDT | Special Marine Warning | PHI | 54 min | |
| Jul 31, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset | 17 min |
| Jul 31, 5:02 PM EDT | Special Weather Statement | PHI | Atlantic | 28 min |
| Jul 31, 5:16 PM EDT | Special Weather Statement | PHI | Atlantic | 44 min |
| Jul 31, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cumberland, Ocean, Salem | 48 min |
| Jul 31, 5:41 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 3 hr |
| Jul 31, 5:44 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 25 min |
| Jul 31, 5:51 PM EDT | Special Marine Warning | PHI | 54 min | |
| Jul 31, 5:55 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 35 min |
| Jul 31, 5:57 PM EDT | Special Marine Warning | PHI | 63 min | |
| Jul 31, 6:05 PM EDT | Special Marine Warning | PHI | 55 min | |
| Jul 31, 6:41 PM EDT | Special Marine Warning | PHI | 64 min | |
| Jul 31, 6:53 PM EDT | Special Marine Warning | PHI | 54 min | |
| Jul 31, 7:36 PM EDT | Special Marine Warning | PHI | 54 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2019Severe Thunderstorm Warnings in New Jersey, 2019Severe Thunderstorm Warnings in Delaware, 2019Every severe thunderstorm warning in 2019
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.