Alert archive / Delaware / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 159, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2021, 6:19 PM EDT for New Castle County, Delaware; Salem County, New Jersey. It was in force for 41 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
- Jul 9, 2021, 6:19 PM EDT (22:19 UTC)
- Expired
- Jul 9, 2021, 7:00 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 22:21 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 9, 6:24 PM EDT | TSTM WND DMG | 2 Ssw Newark, DE | TREE DOWN IN THE 400 BLOCK OF LARK DRIVE. TIME ESTIMATED FROM RADAR. |
| Jul 9, 6:55 PM EDT | MARINE TSTM WIND 40 | 4 Ssw Elsinboro Twp, NJ | GUST MEASURED AT NJ WXNET SITE AT LOWER ALLOWAYS CREEK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 176 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
- 862 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
029
WUUS51 KPHI 092219
SVRPHI
DEC003-NJC033-092300-
/O.NEW.KPHI.SV.W.0159.210709T2219Z-210709T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
619 PM EDT Fri Jul 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
Western Salem County in southern New Jersey...
* Until 700 PM EDT.
* At 618 PM EDT, a severe thunderstorm was located over Elkton,
moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle,
Penns Grove, Salem, Alloway, Quinton, Delaware City, Newport,
Stanton, Glasgow, Bear, Hancocks Bridge, Port Penn, Wilmington
Manor, Saint Georges and Mount Pleasant.
This includes the following highways...
New Jersey Turnpike near exit 1.
Interstate 95 in Delaware between mile markers 0 and 13.
Interstate 295 in New Jersey between mile markers 0 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3975 7538 3946 7539 3945 7541 3944 7541
3943 7540 3943 7541 3942 7541 3952 7578
3962 7579 3972 7579
TIME...MOT...LOC 2218Z 269DEG 27KT 3963 7582
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
Staarmann2 follow-up statements
300
WWUS51 KPHI 092243
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
643 PM EDT Fri Jul 9 2021
DEC003-NJC033-092300-
/O.CON.KPHI.SV.W.0159.000000T0000Z-210709T2300Z/
New Castle DE-Salem NJ-
643 PM EDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR NORTHERN NEW CASTLE AND WESTERN SALEM COUNTIES...
At 643 PM EDT, a severe thunderstorm was located over Bear, or 7
miles southeast of Newark, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle,
Penns Grove, Salem, Alloway, Quinton, Delaware City, Newport,
Stanton, Glasgow, Bear, Hancocks Bridge, Port Penn, Wilmington Manor,
Saint Georges and Mount Pleasant.
This includes the following highways...
New Jersey Turnpike near exit 1.
Interstate 95 in Delaware between mile markers 0 and 13.
Interstate 295 in New Jersey between mile markers 0 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3975 7538 3946 7539 3945 7541 3944 7541
3943 7540 3943 7541 3942 7541 3952 7578
3962 7579 3972 7579
TIME...MOT...LOC 2243Z 269DEG 25KT 3963 7563
HAIL...1.00IN
WIND...60MPH
$$
Staarmann654
WWUS51 KPHI 092253
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
653 PM EDT Fri Jul 9 2021
DEC003-NJC033-092300-
/O.CON.KPHI.SV.W.0159.000000T0000Z-210709T2300Z/
New Castle DE-Salem NJ-
653 PM EDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR CENTRAL NEW CASTLE AND WESTERN SALEM COUNTIES...
At 652 PM EDT, a severe thunderstorm was located near New Castle, or
8 miles south of Wilmington, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Wilmington, Pennsville, Carneys Point, Elsmere, New Castle, Penns
Grove, Salem, Alloway, Quinton, Delaware City, Newport, Saint
Georges, Mount Pleasant, Stanton, Delaware Memorial Bridge, Hancocks
Bridge, Port Penn, Wilmington Manor, Hope Creek and Newport Meadows.
This includes the following highways...
New Jersey Turnpike near exit 1.
Interstate 95 in Delaware between mile markers 7 and 13.
Interstate 295 in New Jersey between mile markers 0 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3960 7566 3973 7567 3975 7538 3946 7539
3945 7541 3944 7541 3943 7540 3943 7541
3942 7541 3952 7578 3957 7578
TIME...MOT...LOC 2252Z 269DEG 26KT 3962 7557
HAIL...1.00IN
WIND...60MPH
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 10:19 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 5 hr |
| Jul 8, 11:37 PM EDT | Tornado Warning | PHI | Sussex | 23 min |
| Jul 8, 11:59 PM EDT | Tornado Warning | PHI | Sussex | 12 min |
| Jul 9, 12:04 AM EDT | Tornado Warning | PHI | Sussex | 26 min |
| Jul 9, 12:11 AM EDT | Tornado Warning | PHI | Sussex | 35 min |
| Jul 9, 12:28 AM EDT | Tornado Warning | PHI | Sussex | 17 min |
| Jul 9, 4:54 PM EDT | Special Weather Statement | PHI | New Castle | 66 min |
| Jul 9, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 43 min |
| Jul 9, 6:50 PM EDT | Areal Flood Advisory | PHI | New Castle | 2 hr |
| Jul 9, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 63 min |
| Jul 8, 10:25 PM EDT | Areal Flood Advisory | PHI | Cape May, Cumberland | 7 hr |
| Jul 8, 11:02 PM EDT | Special Marine Warning | PHI | 88 min | |
| Jul 8, 11:59 PM EDT | Areal Flood Advisory | PHI | Salem | 5 hr |
| Jul 9, 12:07 AM EDT | Special Marine Warning | PHI | 53 min | |
| Jul 9, 12:08 AM EDT | Areal Flood Advisory | PHI | Atlantic, Camden, Gloucester | 6 hr |
| Jul 9, 12:25 AM EDT | Special Marine Warning | PHI | 95 min | |
| Jul 9, 1:34 AM EDT | Special Marine Warning | PHI | 86 min | |
| Jul 9, 1:49 AM EDT | Special Marine Warning | PHI | 26 min | |
| Jul 9, 2:05 AM EDT | Areal Flood Advisory | PHI | Burlington, Monmouth, Ocean | 8 hr |
| Jul 9, 2:50 AM EDT | Tornado Warning | PHI | Atlantic, Cape May, Cumberland | 25 min |
| Jul 9, 2:53 AM EDT | Special Marine Warning | PHI | 68 min | |
| Jul 9, 3:38 AM EDT | Tornado Warning | PHI | Atlantic, Burlington, Ocean | 18 min |
| Jul 9, 3:51 AM EDT | Special Marine Warning | PHI | 84 min | |
| Jul 9, 4:08 AM EDT | Gale Warning | PHI | 3 hr | |
| Jul 9, 4:41 AM EDT | Tornado Warning | PHI | Monmouth, Ocean | 34 min |
| Jul 9, 4:44 AM EDT | Areal Flood Advisory | PHI | Mercer, Middlesex | 5 hr |
| Jul 9, 4:54 AM EDT | Areal Flood Advisory | PHI | Morris, Somerset | 5 hr |
| Jul 9, 4:58 AM EDT | Special Marine Warning | PHI | 39 min | |
| Jul 9, 5:34 PM EDT | Areal Flood Advisory | PHI | Sussex, Warren | 2 hr |
| Jul 9, 6:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Jul 9, 7:17 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 23 min |
| Jul 9, 7:39 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Sussex, Warren | 2 hr |
| Jul 9, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 62 min |
| Jul 9, 7:46 PM EDT | Areal Flood Advisory | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 108 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2021Severe Thunderstorm Warnings in New Jersey, 2021Every severe thunderstorm warning in 2021
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.