Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 74, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 9, 2021, 5:32 PM EDT for Burlington County, Mercer County, Monmouth County, New Jersey; Bucks County, Pennsylvania. It was in force for 28 min. 1 report 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
- Jun 9, 2021, 5:32 PM EDT (21:32 UTC)
- Expired
- Jun 9, 2021, 6:00 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Burlington County, NJ, Mercer County, NJ, Monmouth County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 21:34 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 |
|---|---|---|---|
| Jun 9, 5:35 PM EDT | TSTM WND DMG | 2 Ssw Ewing, NJ | TREE DOWN ON AN APARTMENT BUILDING OFF SULLIVAN WAY. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.5 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
- 556 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted.
543
WUUS51 KPHI 092132
SVRPHI
NJC005-021-025-PAC017-092200-
/O.NEW.KPHI.SV.W.0074.210609T2132Z-210609T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
532 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Mercer County in central New Jersey...
North central Burlington County in southern New Jersey...
Southwestern Monmouth County in central New Jersey...
East central Bucks County in southeastern Pennsylvania...
* Until 600 PM EDT.
* At 531 PM EDT, a severe thunderstorm was located over Yardley, or
over Trenton, moving southeast at 10 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...
Trenton, Ewing, Hightstown, Bordentown, Pennington, Yardley,
Tullytown, Allentown, Washington Crossing, Edinburg, Crosswicks,
White Horse, Windsor, Mercerville-Hamilton Square, Lawrenceville,
Woodside, Georgetown, Levittown, Florence-Roebling and Morrisville.
This includes the following highways...
New Jersey Turnpike between exits 7 and 8.
Interstate 195 in New Jersey between mile markers 0 and 9.
Interstate 295 in New Jersey between mile markers 54 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4021 7494 4035 7483 4026 7450 4004 7466
TIME...MOT...LOC 2131Z 300DEG 9KT 4024 7481
HAIL...0.75IN
WIND...60MPH
$$
Fitzsimmons2 follow-up statements
845
WWUS51 KPHI 092140
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
540 PM EDT Wed Jun 9 2021
NJC005-021-025-PAC017-092200-
/O.CON.KPHI.SV.W.0074.000000T0000Z-210609T2200Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Bucks PA-
540 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR MERCER...NORTH CENTRAL BURLINGTON...SOUTHWESTERN MONMOUTH AND
EAST CENTRAL BUCKS COUNTIES...
At 540 PM EDT, a severe thunderstorm was located over Trenton, moving
southeast at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Trenton, Ewing, Hightstown, Bordentown, Pennington, Yardley,
Tullytown, Allentown, Washington Crossing, Edinburg, Crosswicks,
White Horse, Windsor, Mercerville-Hamilton Square, Lawrenceville,
Woodside, Georgetown, Levittown, Florence-Roebling and Morrisville.
This includes the following highways...
New Jersey Turnpike between exits 7 and 8.
Interstate 195 in New Jersey between mile markers 0 and 9.
Interstate 295 in New Jersey between mile markers 54 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4021 7494 4035 7483 4026 7450 4004 7466
TIME...MOT...LOC 2140Z 300DEG 9KT 4023 7478
HAIL...0.75IN
WIND...60MPH
$$
Fitzsimmons143
WWUS51 KPHI 092150 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
550 PM EDT Wed Jun 9 2021
NJC005-021-025-PAC017-092200-
/O.EXP.KPHI.SV.W.0074.000000T0000Z-210609T2200Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Bucks PA-
550 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR MERCER...NORTH CENTRAL
BURLINGTON...SOUTHWESTERN MONMOUTH AND EAST CENTRAL BUCKS COUNTIES
WILL EXPIRE AT 600 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. However heavy rain
is still possible with this thunderstorm.
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 4021 7494 4035 7483 4026 7450 4004 7466
TIME...MOT...LOC 2150Z 300DEG 9KT 4022 7475
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 8:40 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jun 9, 1:46 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jun 9, 1:48 PM EDT | Special Weather Statement | PHI | Salem | 27 min |
| Jun 9, 1:52 PM EDT | Special Weather Statement | PHI | Atlantic | 23 min |
| Jun 9, 2:07 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 23 min |
| Jun 9, 2:14 PM EDT | Special Weather Statement | PHI | Salem | 31 min |
| Jun 9, 2:21 PM EDT | Flash Flood Warning | PHI | Cumberland, Gloucester, Salem | 73 min |
| Jun 9, 2:47 PM EDT | Special Marine Warning | PHI | 58 min | |
| Jun 9, 3:32 PM EDT | Special Weather Statement | PHI | Burlington | 28 min |
| Jun 9, 3:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| Jun 9, 3:49 PM EDT | Flash Flood Warning | PHI | Burlington | 3 hr |
| Jun 9, 3:51 PM EDT | Special Weather Statement | PHI | Hunterdon | 24 min |
| Jun 9, 6:46 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jun 9, 6:50 PM EDT | Areal Flood Advisory | PHI | Monmouth, Ocean | 87 min |
| Jun 9, 7:42 PM EDT | Special Marine Warning | PHI | 63 min | |
| Jun 9, 4:54 PM EDT | Flash Flood Warning | PHI | Berks, Montgomery | 112 min |
| Jun 9, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 23 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 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.