Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 317, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 20, 2026, 6:13 PM EDT for New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 47 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 20, 2026, 6:13 PM EDT (22:13 UTC)
- Expired
- Aug 20, 2026, 7:00 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 41 km from the middle of the area, began a volume at 22:13 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 20, 6:17 PM EDT | HAIL 0.75 | 1 N Plymouth Meeting, PA | Report from mPING: Dime (0.75 in.). |
| Aug 20, 6:30 PM EDT | TSTM WND DMG | 1 Ne Roxborough, PA | Downed trees along Schuylkill Expressway near Exit 339. |
| Aug 20, 6:30 PM EDT | HAIL 0.75 | 2 N Plymouth Meeting, PA | Report from mPING: Dime (0.75 in.). |
| Aug 20, 7:00 PM EDT | TSTM WND DMG | 1 E Fairless Hills, PA | 2 trees down along route 13 in Falls Township. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 17 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
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 20, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 20, 2:58 PM EDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.2 hours before the alert went out and 196 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
- 1229 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
709
WUUS51 KPHI 202213
SVRPHI
DEC003-NJC005-007-015-021-033-PAC017-045-091-101-202300-
/O.NEW.KPHI.SV.W.0317.260820T2213Z-260820T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
613 PM EDT Thu Aug 20 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern New Castle County in northern Delaware...
Northern Salem County in southern New Jersey...
Camden County in southern New Jersey...
Southeastern Mercer County in central New Jersey...
Gloucester County in southern New Jersey...
Northwestern Burlington County in southern New Jersey...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Eastern Delaware County in southeastern Pennsylvania...
* Until 700 PM EDT.
* At 612 PM EDT, severe thunderstorms were located along a line
extending from near Ambler to Paulsboro to near Woodstown, moving
east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Philadelphia, Trenton, Camden, Wilmington, Gloucester City, Cherry
Hill, Bensalem, Evesham, Mount Laurel, Norristown, Chester,
Willingboro, Deptford, Voorhees, and Medford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 1000 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
&&
LAT...LON 4019 7457 4018 7461 4012 7458 3978 7469
3955 7495 3961 7563 3993 7536 4023 7531
4024 7456
TIME...MOT...LOC 2212Z 276DEG 27KT 4017 7518 3983 7525 3965 7540
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
DeSilva3 follow-up statements
486
WWUS51 KPHI 202232
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
632 PM EDT Thu Aug 20 2026
DEC003-NJC021-202242-
/O.CAN.KPHI.SV.W.0317.000000T0000Z-260820T2300Z/
New Castle DE-Mercer NJ-
632 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE AND
SOUTHEASTERN MERCER COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
central New Jersey.
LAT...LON 3978 7469 3955 7495 3956 7505 3957 7506
3956 7509 3959 7544 3990 7529 4017 7525
4016 7472 4015 7472 4016 7470 4016 7465
4013 7458
TIME...MOT...LOC 2232Z 270DEG 27KT 4016 7499 3982 7506 3964 7521
$$
NJC005-007-015-033-PAC017-045-091-101-202300-
/O.CON.KPHI.SV.W.0317.000000T0000Z-260820T2300Z/
Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Philadelphia PA-Delaware PA-
632 PM EDT Thu Aug 20 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR CENTRAL SALEM...CAMDEN...GLOUCESTER...NORTHWESTERN BURLINGTON...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...PHILADELPHIA AND
SOUTHEASTERN DELAWARE COUNTIES...
At 632 PM EDT, severe thunderstorms were located along a line
extending from Feasterville to near Magnolia to near Elmer, moving
east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Bensalem,
Evesham, Mount Laurel, Willingboro, Deptford, Voorhees, Medford, West
Deptford, Glassboro, Lindenwold, and Lumberton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3978 7469 3955 7495 3956 7505 3957 7506
3956 7509 3959 7544 3990 7529 4017 7525
4016 7472 4015 7472 4016 7470 4016 7465
4013 7458
TIME...MOT...LOC 2232Z 270DEG 27KT 4016 7499 3982 7506 3964 7521
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
DeSilva042
WWUS51 KPHI 202247
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
647 PM EDT Thu Aug 20 2026
PAC017-045-091-101-202257-
/O.CAN.KPHI.SV.W.0317.000000T0000Z-260820T2300Z/
Montgomery PA-Bucks PA-Philadelphia PA-Delaware PA-
647 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.
LAT...LON 3978 7469 3955 7495 3956 7505 3957 7506
3956 7509 3958 7534 3981 7517 3995 7502
3991 7465
TIME...MOT...LOC 2247Z 276DEG 27KT 4015 7486 3981 7493 3963 7508
$$
NJC005-007-015-033-202300-
/O.CON.KPHI.SV.W.0317.000000T0000Z-260820T2300Z/
Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-
647 PM EDT Thu Aug 20 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR EAST CENTRAL SALEM...CAMDEN...GLOUCESTER AND CENTRAL BURLINGTON
COUNTIES...
At 647 PM EDT, severe thunderstorms were located along a line
extending from Levittown to Berlin to Franklinville, moving east at
30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Cherry Hill, Evesham, Mount Laurel, Voorhees, Medford, Glassboro,
Lindenwold, Bellmawr, Woodbury, Pitman, Clayton, Berlin, Tabernacle,
Shamong, and Magnolia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3978 7469 3955 7495 3956 7505 3957 7506
3956 7509 3958 7534 3981 7517 3995 7502
3991 7465
TIME...MOT...LOC 2247Z 276DEG 27KT 4015 7486 3981 7493 3963 7508
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva575
WWUS51 KPHI 202252
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
652 PM EDT Thu Aug 20 2026
NJC005-007-015-033-202302-
/O.EXP.KPHI.SV.W.0317.000000T0000Z-260820T2300Z/
Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-
652 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SALEM...CAMDEN...
GLOUCESTER AND CENTRAL BURLINGTON COUNTIES WILL EXPIRE AT 700 PM
EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.
LAT...LON 3978 7469 3955 7495 3956 7505 3957 7506
3956 7509 3958 7534 3981 7517 3995 7502
3991 7465
TIME...MOT...LOC 2252Z 270DEG 27KT 4015 7482 3981 7489 3963 7504
$$
DeSilvaWhat forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 4:23 PM EDT, 1 hour 50 minutes earlier. Its key messages:
- 1. A cold front will cross the region this evening, resulting in widespread showers and thunderstorms. Flash flooding, damaging wind gusts and tornadoes are possible later today. 2. Conditions look to remain unsettled through the weekend, with daily chances of showers and storms each day. 3. Fair weather is expected to return for early next week.
Area forecast discussion, Aug 20, 4:23 PM EDT, 1 hour 50 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
423 PM EDT Thu Aug 20 2026
.WHAT HAS CHANGED...
Severe thunderstorm and tornado watches now in effect for most
of the forecast area.
&&
.KEY MESSAGES...
1. A cold front will cross the region this evening, resulting
in widespread showers and thunderstorms. Flash flooding,
damaging wind gusts and tornadoes are possible later today.
2. Conditions look to remain unsettled through the
weekend, with daily chances of showers and storms each day.
3. Fair weather is expected to return for early next week.
&&
.DISCUSSION...
KEY MESSAGE 1...Broad troughing will be the main driving force
in the sensible weather into the early to middle part of next
week across much of the Eastern Seaboard. A shortwave will round
the base of the trough today into this evening providing some
mid level synoptic forcing. At the surface a warm front has
lifted north into the Philadelphia metro area with a cold front
approaching from the west.
The trend for increasing QPF and increasing severe weather
potential is being realized this afternoon. Severe thunderstorm,
tornado, and flood watches are in effect for most of the
forecast area.
Mesoanalysis fields this afternoon show moderate to strong
instability centered roughly around the Delmarva peninsula, but
extending north into southern NJ and southeast PA. Deep layer
shear of 40-60kt along with backed low level flow and strongly
curved hodographs will support a tornado risk, most notably from
the Philadelphia metro area and points south. Primary mode at
the moment is supercellular with all attendant risks, but more
multicell clusters may become the primary mode along the cold
front.
The other threat this evening is the potential for flash
flooding. Guidance shows very moisture rich airmass surging into
the region with PWAT values raching 2-2.5 inches. Warm cloud
depths suggest warm rain processes and high precipitation
efficiency into this evening and WPC has introduced a moderate
risk of execessive reainfall from Philadelphia north and east.
In general, expecting anywhere between 1 to 2 inches of rain to
fall, with localized higher amounts up to 3 to 5 inches.
The severe and flooding rain threat will diminish by the late
evening and overnight hours.
KEY MESSAGE 2...Conditions look to remain unsettled through the
weekend, with daily chances of showers and storms each day.
Mid to long range NWP and AI guidance suggests that the pattern
could become unsettled Friday night and into the weekend.
The cold front crossing the area tonight will stall in the
offshore waters. waves of low pressure will ride along the
stalled front resulting in unsettled weather through the
weekend. The main periods to watch are early Saturday through
Saturday evening, with periods of rain increasingly likely, and
again on Sunday. The severe threat appears low at this time but
there could be additional flooding concerns, although no day
has more than a Marginal (1/5) Risk for excessive rainfall.
Temperatures will be seasonable, but humidity will be
uncomfortable.
KEY MESSAGE 3...Fair weather is expected to return for early
next week.
Weak high pressure looks to bring quieter and drier weather in
the early part of the week, with more unsettled conditions
expected later in the week with seasonable temperatures.
&&
.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Today...Widespread showers and thunderstorms are likely at all
locations this afternoon and evening. Any storms will be
capable of producing very heavy rainfall and LIFR conditions.
Winds will vary depending on location, with northern terminals
experiencing northeast winds 5 to 10 kt where southern
terminals will encounter southeasterly winds around 10 kt. Winds
will be gusty and erratic near any storm. Bulk of the shower and
storm activity ending around 01-02z. Moderate confidence
overall, but low confidence on exact timing details.
Tonight...Sub-VFR conditions probable at times with showers and
thunderstorms continuing into the evening hours. Fog and/or low
stratus possible at night after the precipitation moves out.
Conditions should lift back to VFR near or not long after
daybreak. North/northeast winds around 5 to 10 kt. Moderate
confidence.
Outlook...
Friday through Friday night...Primarily VFR.
Saturday through Sunday...Periods of VFR and sub-VFR at times.
Restrictions expected with daily chances for showers and
thunderstorms.
Monday...VFR. No significant weather expected.
&&
.MARINE...
A cold front will move through tonight, with winds becoming
more north/northeasterly around 10-15 kt. Seas of 2 to 3 feet.
Showers and thunderstorms expected on the waters this evening
into tonight.
Outlook...
Friday through Monday...No marine headlines expected. Showers
and thunderstorms possible during the day Friday through
Sunday.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch until 2 AM EDT Friday for PAZ054-055-060>062-070-
071-101>106.
NJ...Flood Watch until 2 AM EDT Friday for NJZ001-007>010-012>022-
025>027.
DE...Flood Watch until 2 AM EDT Friday for DEZ001.
MD...None.
MARINE...None.
&&
DISCUSSION...Manning
AVIATION...Manning
MARINE...ManningHazardous weather outlook, Aug 20, 5:12 AM EDT, 13 hours 1 minute before
Hazardous Weather Outlook National Weather Service Mount Holly NJ 512 AM EDT Thu Aug 20 2026 MDZ012-015-019-020-210915- Kent MD-Queen Annes-Talbot-Caroline- 512 AM EDT Thu Aug 20 2026 This Hazardous Weather Outlook is for northeast Maryland. .DAY ONE...Today and tonight. Numerous thunderstorms are expected between about 2 PM and 8 PM. These storms may contain damaging wind gusts and potentially a couple of tornadoes over the Eastern Shore. Storms will be capable of producing heavy rainfall, with rainfall rates of 2 to 4" per hour possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Hoeflich
In the hours before
Local storm report, Aug 20, 4:47 PM EDT, 1 hour 26 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
447 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM Rain 2 S Smyrna Landing 39.28N 75.58W
08/20/2026 M1.92 Inch Kent DE Mesonet
DEOS Smyrna recorded 1.92 inches of rain
over 3 hours from 1-4pm.
&&
MJLLocal storm report, Aug 20, 5:38 PM EDT, 35 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
538 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0538 PM Tstm Wnd Dmg East Nantmeal Twp 40.12N 75.72W
08/20/2026 Chester PA Public
Trees down.
&&
PFLocal storm report, Aug 20, 5:42 PM EDT, 31 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
542 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0541 PM Tstm Wnd Dmg West Grove 39.82N 75.83W
08/20/2026 Chester PA Public
Trees down. some trees on wires.
&&
PFLocal storm report, Aug 20, 5:45 PM EDT, 28 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
545 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0520 PM Tstm Wnd Dmg Honey Brook 40.10N 75.91W
08/20/2026 Chester PA Public
Trees down and blocking route 322.
&&
PFLocal storm report, Aug 20, 5:48 PM EDT, 25 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
548 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0525 PM Tstm Wnd Dmg Glenmoore 40.09N 75.77W
08/20/2026 Chester PA Public
Trees and wires down across Creek Road with
wires arcing. Time estimated from radar.
&&
PFLocal storm report, Aug 20, 6:04 PM EDT, 9 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
604 PM EDT Thu Aug 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0550 PM Rain 1 SE Atlantic City Inte 39.44N 74.55W
08/20/2026 M1.98 Inch Atlantic NJ Trained Spotter
CoCoRaHS station reported 1.98 inches of
rain over 2 hours.
&&
MJLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 4:16 PM EDT | Tornado Warning | PHI | Kent | 29 min |
| Aug 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 40 min |
| Aug 20, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Aug 20, 5:39 PM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 20, 5:39 PM EDT | Tornado Warning | PHI | Kent | 36 min |
| Aug 20, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 50 min |
| Aug 20, 6:03 PM EDT | Tornado Warning | PHI | Kent | 42 min |
| Aug 20, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 51 min |
| Aug 20, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 39 min |
| Aug 20, 6:53 PM EDT | Flash Flood Warning | PHI | Kent | 105 min |
| Aug 20, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 48 min |
| Aug 20, 2:04 PM EDT | Special Marine Warning | PHI | 86 min | |
| Aug 20, 3:26 PM EDT | Special Marine Warning | PHI | 94 min | |
| Aug 20, 4:38 PM EDT | Tornado Warning | PHI | Atlantic | 37 min |
| Aug 20, 4:41 PM EDT | Flash Flood Warning | PHI | Atlantic, Cape May, Cumberland | 4 hr |
| Aug 20, 5:13 PM EDT | Special Marine Warning | PHI | 92 min | |
| Aug 20, 5:14 PM EDT | Special Marine Warning | PHI | 91 min | |
| Aug 20, 5:24 PM EDT | Flash Flood Warning | PHI | Atlantic | 4 hr |
| Aug 20, 5:36 PM EDT | Special Marine Warning | PHI | 84 min | |
| Aug 20, 6:15 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 20, 6:26 PM EDT | Flash Flood Warning | PHI | Mercer | 4 hr |
| Aug 20, 6:30 PM EDT | Special Marine Warning | PHI | 90 min | |
| Aug 20, 6:38 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 37 min |
| Aug 20, 6:44 PM EDT | Special Marine Warning | PHI | 61 min | |
| Aug 20, 7:01 PM EDT | Tornado Warning | PHI | Atlantic, Cape May, Cumberland | 29 min |
| Aug 20, 7:08 PM EDT | Tornado Warning | PHI | Cape May | 22 min |
| Aug 20, 7:10 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 50 min |
| Aug 20, 7:37 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 20, 7:43 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 20, 4:59 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 46 min |
| Aug 20, 5:22 PM EDT | Tornado Warning | PHI | Chester, Delaware | 38 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2026Severe Thunderstorm Warnings in Pennsylvania, 2026Severe Thunderstorm Warnings in Delaware, 2026Every severe thunderstorm warning in 2026
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.