Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 154, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 6:06 PM EDT for Hunterdon County, New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 39 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
- Jul 8, 2021, 6:06 PM EDT (22:06 UTC)
- Expired
- Jul 8, 2021, 6:45 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 22:09 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 8, 6:07 PM EDT | TSTM WND DMG | 1 E North Wales, PA | DOWNED TREE BLOCKING E PROSPECT AVE AT 10TH ST. TIME ESTIMATED FROM RADAR. |
| Jul 8, 6:10 PM EDT | TSTM WND DMG | Doylestown, PA | LARGE TREE BRANCHES AND WIRES DOWN IN DOYLESTOWN. |
| Jul 8, 6:10 PM EDT | TSTM WND DMG | Doylestown, PA | TREE BRANCHES AND WIRES DOWN IN DOYLESTOWN. |
| Jul 8, 6:12 PM EDT | TSTM WND DMG | 1 Se New Britain, PA | VIDEO OF MULTIPLE LARGE TREES DOWN ON POWERLINES ALONG ALMSHOUSE ROAD IN DOYLESTOWN PA. 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 |
|---|---|---|---|
| Jul 8, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.1 hours before the alert went out and 191 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
- 973 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 751 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
356
WUUS51 KPHI 082206
SVRPHI
NJC019-PAC017-091-082245-
/O.NEW.KPHI.SV.W.0154.210708T2206Z-210708T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
606 PM EDT Thu Jul 8 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southern Hunterdon County in northwestern New Jersey...
East central Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
* Until 645 PM EDT.
* At 606 PM EDT, a severe thunderstorm was located near Ambler, or 15
miles north of Philadelphia, moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Lansdale, Doylestown, Byram, Hatboro, Bedminster, Ambler,
Jenkintown, Chalfont, Tinicum, Hatfield, New Hope, Dublin,
Abington, Ferndale, Bryn Athyn, Frenchtown, Milford, Ivyland,
Riegelsville and Stockton.
This includes the following highways...
Pennsylvania Turnpike between mile markers 338 and 346.
Northeast Extension between mile markers 24 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4034 7491 4034 7494 4032 7492 4009 7511
4018 7534 4059 7520 4048 7479
TIME...MOT...LOC 2206Z 202DEG 34KT 4022 7520
HAIL...<.75IN
WIND...60MPH
$$
JEO2 follow-up statements
575
WWUS51 KPHI 082219
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
619 PM EDT Thu Jul 8 2021
PAC091-082228-
/O.CAN.KPHI.SV.W.0154.000000T0000Z-210708T2245Z/
Montgomery PA-
619 PM EDT Thu Jul 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central and northwestern New Jersey...and southeastern Pennsylvania.
LAT...LON 4034 7491 4034 7494 4032 7492 4018 7506
4031 7530 4059 7520 4048 7479
TIME...MOT...LOC 2218Z 202DEG 34KT 4033 7514
$$
NJC019-PAC017-082245-
/O.CON.KPHI.SV.W.0154.000000T0000Z-210708T2245Z/
Hunterdon NJ-Bucks PA-
619 PM EDT Thu Jul 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTHERN HUNTERDON AND CENTRAL BUCKS COUNTIES...
At 618 PM EDT, a severe thunderstorm was located over Doylestown, or
21 miles west of Trenton, moving north at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Law enforcement. There have been numerous reports of downed
trees and wires with these storms.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Perkasie, Doylestown, Byram, Bedminster, Chalfont, Tinicum, New Hope,
Dublin, Ferndale, Frenchtown, Milford, Ivyland, Riegelsville,
Stockton, Fricks, Revere, Lumberville, Ottsville, Sergeantsville and
Pipersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4034 7491 4034 7494 4032 7492 4018 7506
4031 7530 4059 7520 4048 7479
TIME...MOT...LOC 2218Z 202DEG 34KT 4033 7514
HAIL...<.75IN
WIND...60MPH
$$
JEO715
WWUS51 KPHI 082240
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
640 PM EDT Thu Jul 8 2021
NJC019-PAC017-082250-
/O.EXP.KPHI.SV.W.0154.000000T0000Z-210708T2245Z/
Hunterdon NJ-Bucks PA-
640 PM EDT Thu Jul 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HUNTERDON AND CENTRAL
BUCKS COUNTIES WILL EXPIRE AT 645 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central and northwestern New Jersey...and southeastern Pennsylvania.
LAT...LON 4034 7491 4034 7494 4032 7492 4018 7506
4031 7530 4059 7520 4048 7479
TIME...MOT...LOC 2240Z 202DEG 34KT 4034 7514
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 11:06 PM EDT | Tropical Storm Warning | PHI | Atlantic, Burlington, Cape May, Monmouth, Ocean | 32 hr |
| Jul 7, 11:37 PM EDT | Special Weather Statement | PHI | Sussex | 38 min |
| Jul 8, 5:27 AM EDT | Small Craft Advisory | PHI | 34 hr | |
| Jul 8, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 41 min |
| Jul 8, 2:09 PM EDT | Special Marine Warning | PHI | 81 min | |
| Jul 8, 2:26 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 21 min |
| Jul 8, 2:29 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Warren | 46 min |
| Jul 8, 2:43 PM EDT | Rip Current Statement | PHI | Atlantic, Cape May, Monmouth, Ocean | 27 hr |
| Jul 8, 3:03 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 42 min |
| Jul 8, 4:02 PM EDT | Special Marine Warning | PHI | 33 min | |
| Jul 8, 4:02 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 31 min |
| Jul 8, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 16 min |
| Jul 8, 5:29 PM EDT | Special Weather Statement | PHI | Morris, Warren | 46 min |
| Jul 8, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 41 min |
| Jul 8, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex | 51 min |
| Jul 8, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 44 min |
| Jul 7, 11:11 PM EDT | Special Weather Statement | PHI | Monroe | 49 min |
| Jul 8, 8:53 AM EDT | Special Weather Statement | PHI | Monroe | 52 min |
| Jul 8, 9:31 AM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 119 min |
| Jul 8, 9:46 AM EDT | Special Weather Statement | PHI | Monroe | 44 min |
| Jul 8, 3:50 PM EDT | Special Weather Statement | PHI | Berks | 25 min |
| Jul 8, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Montgomery | 39 min |
| Jul 8, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 50 min |
| Jul 8, 4:45 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 45 min |
| Jul 8, 4:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 54 min |
| Jul 8, 5:11 PM EDT | Special Weather Statement | PHI | Lehigh | 34 min |
| Jul 8, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 39 min |
| Jul 8, 5:52 PM EDT | Special Weather Statement | PHI | Berks | 23 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.