Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 303, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 30, 2020, 3:01 PM EST for New Castle County, Delaware; 4 counties in Pennsylvania; Gloucester County, Salem County, New Jersey. It was in force for 44 min. 23 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
- Nov 30, 2020, 3:01 PM EST (20:01 UTC)
- Expired
- Nov 30, 2020, 3:45 PM EST
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 20:02 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 |
|---|---|---|---|
| Nov 30, 3:05 PM EST | TSTM WND DMG | 2 S Glasgow, DE | DOWNED TREE LIMBS AT A RESIDENCE IN BEAR, CAUSING MINOR STRUCTURAL DAMAGE. TIME CONFIRMED BY RADAR. |
| Nov 30, 3:07 PM EST | TSTM WND DMG | 2 Nnw Nottingham Manor, DE | DOWNED TREES AND WIRES CLOSED WEDGEWOOD ROAD BETWEEN FOX LANE AND WALLACE DRIVE. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:07 PM EST | TSTM WND DMG | 3 Sw Brookside, DE | DOWNED TREES AND WIRES NEAR WELSH TRACT ROAD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:15 PM EST | TSTM WND DMG | 1 Sse Newlin Twp, PA | DOWNED TREE AND WIRES NEAR MARLBOROUGH ROAD IN MARLBORO. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:19 PM EST | TSTM WND DMG | 1 E Marshallton, PA | DOWNED TREE AND WIRES NEAR LUCKY HILL ROAD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:19 PM EST | TSTM WND DMG | 1 Ese Marshallton, PA | LARGE TREE DOWN ON LUCKY HILL ROAD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:19 PM EST | TSTM WND DMG | 1 Wnw East Bradford Twp, PA | DOWNED TREES AND WIRES NEAR NORTH CREEK ROAD NEAR EAST BRADFORD TWP. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:19 PM EST | TSTM WND DMG | 2 Wsw Pennsbury Twp, PA | DOWNED TREE ON ROUTE 1 NEAR STATE ROUTE 52. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:20 PM EST | TSTM WND DMG | 2 Nne Winterthur, DE | DOWNED TREE ON MONTCHANIN ROAD NEAR TWADDELL MILL ROAD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:20 PM EST | TSTM WND DMG | 2 Sw East Whiteland Twp, PA | WIRES DOWN NEAR FRAME AVE AND MULBERRY DR. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:20 PM EST | TSTM WND DMG | Pocopson Twp, PA | DOWNED TREE AND WIRES NEAR WILLIAMSBURG ROAD IN POCOPSON TWP. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:21 PM EST | TSTM WND DMG | 1 E East Bradford Twp, PA | DOWNED TREE AND WIRES ON ASHBRIDGE STREET. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:21 PM EST | TSTM WND DMG | 2 Wsw Brookfield, PA | WIRES DOWN NEAR THE INTERSECTION OF FAIRVILLE RD AND COSSART DR. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:22 PM EST | TSTM WND DMG | 1 Nnw Pennsbury Twp, PA | WIRES DOWN NEAR THE INTERSECTION OF POCOPSON RD AND CHANDLER RD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:23 PM EST | TSTM WND DMG | 2 Ese Exton, PA | DOWNED WIRES NEAR SHIP ROAD IN EXTON. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:23 PM EST | TSTM WND DMG | 2 Nne Birmingham Twp, PA | DOWNED TREE NEAR THE INTERSECTION OF WILMINGTON PIKE AND WEST PLEASANT GROVE ROAD. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:26 PM EST | TSTM WND DMG | 1 Wsw Malvern, PA | DOWNED TREE AND WIRES NEAR PICKWICK LANE IN MALVERN. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:28 PM EST | TSTM WND DMG | 1 Wnw Malvern, PA | DOWNED TREE AND WIRES NEAR WOODVIEW ROAD IN MALVERN. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:28 PM EST | TSTM WND DMG | 2 Ssw Malvern, PA | DOWNED TREE AND WIRES NEAR WOODLAND DRIVE IN MALVERN. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:33 PM EST | TSTM WND DMG | 1 E Berwyn, PA | WIRES DOWN NEAR THE INTERSECTION OF WATERLOO RD AND HIGHLAND AVE. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:43 PM EST | TSTM WND DMG | 1 Sw South Chester, PA | DOWNED WIRES NEAR WILSON STREET IN SOUTH CHESTER. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:44 PM EST | TSTM WND DMG | 1 W Woodlyn, PA | DOWNED WIRES NEAR PLEASANT HILL ROAD IN GARDEN CITY. TIME ESTIMATED FROM RADAR. |
| Nov 30, 3:49 PM EST | TSTM WND DMG | 1 N Springfield Twp, PA | DOWNED TREE AND WIRES NEAR OVERHILL ROAD IN SPRINGFIELD 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 |
|---|---|---|---|
| Nov 30, 1:07 PM EST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 181 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
- 498 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 384 m²/s²
- 0-3 km storm-relative helicity
- 623 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
768
WUUS51 KPHI 302001
SVRPHI
DEC003-NJC015-033-PAC029-045-091-101-302045-
/O.NEW.KPHI.SV.W.0303.201130T2001Z-201130T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
301 PM EST Mon Nov 30 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northwestern Salem County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Chester County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 345 PM EST.
* At 301 PM EST, a severe thunderstorm was located over Elkton,
moving northeast at 70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
Norristown, Chester, West Norriton, East Norriton, Pennsville,
Yeadon, Westtown, Carneys Point, Conshohocken, Folcroft, Ambler,
Swarthmore, Elsmere and Paulsboro.
This includes the following highways...
Pennsylvania Turnpike between mile markers 320 and 340.
Northeast Extension between mile markers 21 and 26.
Interstate 95 in Pennsylvania between mile markers 0 and 15, and
between mile markers 20 and 29.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 349.
Interstate 295 in New Jersey between mile markers 0 and 14.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 0 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
A Tornado Watch remains in effect until 700 PM EST for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3995 7569 4022 7537 4008 7496 3944 7576
3945 7578 3972 7579 3972 7587
TIME...MOT...LOC 2001Z 223DEG 61KT 3961 7581
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
JEO2 follow-up statements
558
WWUS51 KPHI 302028
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
328 PM EST Mon Nov 30 2020
DEC003-NJC015-033-PAC029-045-091-101-302045-
/O.CON.KPHI.SV.W.0303.000000T0000Z-201130T2045Z/
New Castle DE-Salem NJ-Gloucester NJ-Montgomery PA-Chester PA-
Philadelphia PA-Delaware PA-
328 PM EST Mon Nov 30 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EST
FOR NORTHERN NEW CASTLE...NORTHWESTERN SALEM...NORTHWESTERN
GLOUCESTER...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN CHESTER...
PHILADELPHIA AND DELAWARE COUNTIES...
At 327 PM EST, a severe thunderstorm was located over Lima, or 10
miles east of West Chester, moving northeast at 70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Middletown, West Chester,
Norristown, Chester, West Norriton, East Norriton, Pennsville,
Yeadon, Westtown, Carneys Point, Conshohocken, Folcroft, Ambler,
Swarthmore, Elsmere and Paulsboro.
This includes the following highways...
Pennsylvania Turnpike between mile markers 320 and 340.
Northeast Extension between mile markers 21 and 26.
Interstate 95 in Pennsylvania between mile markers 0 and 15, and
between mile markers 20 and 29.
Interstate 95 in Delaware between mile markers 1 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 349.
Interstate 295 in New Jersey between mile markers 0 and 14.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 0 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
A Tornado Watch remains in effect until 700 PM EST for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3970 7577 3986 7565 3995 7569 4022 7537
4008 7496 3944 7576 3945 7578
TIME...MOT...LOC 2027Z 223DEG 61KT 3994 7541
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
JEO164
WWUS51 KPHI 302039
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
339 PM EST Mon Nov 30 2020
DEC003-NJC015-033-PAC029-045-091-101-302049-
/O.EXP.KPHI.SV.W.0303.000000T0000Z-201130T2045Z/
New Castle DE-Salem NJ-Gloucester NJ-Montgomery PA-Chester PA-
Philadelphia PA-Delaware PA-
339 PM EST Mon Nov 30 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER...SOUTHEASTERN
MONTGOMERY...SOUTHEASTERN CHESTER...PHILADELPHIA AND DELAWARE
COUNTIES WILL EXPIRE AT 345 PM EST...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Tornado Watch remains in effect until 700 PM EST for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
LAT...LON 3970 7577 3986 7565 3995 7569 4022 7537
4008 7496 3944 7576 3945 7578
TIME...MOT...LOC 2039Z 223DEG 61KT 3996 7539
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 11:35 AM EST | River Flood Warning | PHI | New Castle | 11 hr |
| Nov 30, 12:15 PM EST | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Nov 30, 2:01 PM EST | Coastal Flood Statement | PHI | Sussex | 3 hr |
| Nov 30, 2:41 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 49 min |
| Nov 30, 2:48 PM EST | Areal Flood Warning | PHI | New Castle | 8 hr |
| Nov 30, 3:04 PM EST | Severe Thunderstorm Warning | PHI | Kent, New Castle | 56 min |
| Nov 30, 3:21 PM EST | Tornado Warning | PHI | Kent | 24 min |
| Nov 30, 3:47 PM EST | Tornado Warning | PHI | Kent | 28 min |
| Nov 30, 5:24 PM EST | River Flood Warning | PHI | New Castle | 5 hr |
| Nov 30, 5:39 PM EST | River Flood Warning | PHI | New Castle | 4 hr |
| Nov 30, 12:41 PM EST | Special Weather Statement | PHI | Chester, Montgomery | 49 min |
| Nov 30, 2:17 PM EST | Areal Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 9 hr |
| Nov 30, 2:18 PM EST | Coastal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 2 hr |
| Nov 30, 3:26 PM EST | Areal Flood Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Nov 30, 3:43 PM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton and 1 more | 47 min |
| Nov 30, 3:51 PM EST | River Flood Warning | PHI | Chester | 14 hr |
| Nov 30, 3:53 PM EST | Areal Flood Warning | PHI | Monroe, Northampton | 16 hr |
| Nov 30, 3:53 PM EST | Tornado Warning | PHI | Bucks, Montgomery | 13 min |
| Nov 30, 4:17 PM EST | Areal Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 10 hr |
| Nov 30, 5:30 PM EST | River Flood Warning | PHI | Chester, Delaware | 16 hr |
| Nov 30, 5:33 PM EST | River Flood Warning | PHI | Montgomery | 10 hr |
| Nov 30, 5:35 PM EST | River Flood Warning | PHI | Delaware | 4 hr |
| Nov 30, 12:52 PM EST | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more | 92 min |
| Nov 30, 1:28 PM EST | Areal Flood Advisory | PHI | Hunterdon, Warren | 2 hr |
| Nov 30, 2:01 PM EST | Areal Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 9 hr |
| Nov 30, 2:34 PM EST | Special Weather Statement | PHI | Morris, Sussex | 56 min |
| Nov 30, 3:37 PM EST | Special Marine Warning | PHI | 38 min | |
| Nov 30, 3:58 PM EST | Small Craft Advisory | PHI | 56 hr | |
| Nov 30, 4:49 PM EST | Severe Thunderstorm Warning | PHI | Camden, Cumberland, Gloucester, Salem | 41 min |
| Nov 30, 5:05 PM EST | Special Marine Warning | PHI | 40 min | |
| Nov 30, 5:29 PM EST | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Somerset | 46 min |
| Nov 30, 5:36 PM EST | River Flood Warning | PHI | Hunterdon, Somerset | 7 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in New Jersey, 2020Severe Thunderstorm Warnings in Delaware, 2020Every severe thunderstorm warning in 2020
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.