Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 316, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 20, 2026, 6:09 PM EDT for Kent County, New Castle County, Delaware; Cumberland County, Gloucester County, Salem County, New Jersey. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2026, 6:09 PM EDT (22:09 UTC)
- Expired
- Aug 20, 2026, 7:00 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, DE, New Castle County, DE, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 64 km from the middle of the area, began a volume at 22:12 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
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
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 177 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
- 97 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 1192 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
118
WUUS51 KPHI 202209
SVRPHI
DEC001-003-NJC011-015-033-202300-
/O.NEW.KPHI.SV.W.0316.260820T2209Z-260820T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
609 PM EDT Thu Aug 20 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northern Kent County in central Delaware...
Western Cumberland County in southern New Jersey...
Salem County in southern New Jersey...
South central Gloucester County in southern New Jersey...
* Until 700 PM EDT.
* At 609 PM EDT, a severe thunderstorm was located over Bohemias
Mills, or near Middletown, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Vineland, Newark, Millville, Bridgeton, Middletown, Glassboro,
Pennsville, Smyrna, Carneys Point, New Castle, Salem, Woodstown,
Alloway, Clayton, and Quinton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...northeastern Maryland...and southern New Jersey.
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 central and
northern Delaware...northeastern Maryland...and southern New Jersey.
&&
LAT...LON 3968 7577 3969 7505 3923 7511 3924 7519
3928 7526 3928 7530 3933 7534 3933 7538
3948 7557 3926 7539 3925 7539 3928 7576
3966 7579
TIME...MOT...LOC 2209Z 271DEG 38KT 3948 7577
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva2 follow-up statements
466
WWUS51 KPHI 202240
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
640 PM EDT Thu Aug 20 2026
DEC001-003-202250-
/O.CAN.KPHI.SV.W.0316.000000T0000Z-260820T2300Z/
New Castle DE-Kent DE-
640 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE AND NORTHERN KENT
COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.
LAT...LON 3969 7539 3969 7505 3923 7511 3924 7519
3928 7526 3928 7530 3933 7534 3933 7537
3936 7540 3948 7548
TIME...MOT...LOC 2240Z 271DEG 38KT 3947 7535
$$
NJC011-015-033-202300-
/O.CON.KPHI.SV.W.0316.000000T0000Z-260820T2300Z/
Cumberland NJ-Salem NJ-Gloucester NJ-
640 PM EDT Thu Aug 20 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR WESTERN CUMBERLAND...SALEM AND SOUTH CENTRAL GLOUCESTER
COUNTIES...
At 640 PM EDT, a severe thunderstorm was located over Shiloh, or 7
miles northwest of Bridgeton, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Vineland, Millville, Bridgeton, Glassboro, Clayton, Woodstown,
Alloway, Quinton, Elmer, Greenwich, Shiloh, Newport, Franklinville,
Olivet, and Hancocks Bridge.
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 3969 7539 3969 7505 3923 7511 3924 7519
3928 7526 3928 7530 3933 7534 3933 7537
3936 7540 3948 7548
TIME...MOT...LOC 2240Z 271DEG 38KT 3947 7535
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva911
WWUS51 KPHI 202251
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
651 PM EDT Thu Aug 20 2026
NJC011-015-033-202301-
/O.EXP.KPHI.SV.W.0316.000000T0000Z-260820T2300Z/
Cumberland NJ-Salem NJ-Gloucester NJ-
651 PM EDT Thu Aug 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CUMBERLAND...SALEM AND
SOUTHWESTERN GLOUCESTER COUNTIES WILL EXPIRE AT 700 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM EDT for southern New
Jersey.
LAT...LON 3969 7539 3969 7505 3923 7511 3924 7519
3928 7526 3928 7530 3933 7534 3933 7537
3936 7540 3948 7548
TIME...MOT...LOC 2251Z 271DEG 38KT 3947 7523
$$
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 46 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 46 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, 12 hours 57 minutes 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 22 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, 31 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, 27 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, 24 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, 21 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, 5 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, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 47 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 |
Nearby
Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.