Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 289, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2023, 5:31 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 44 min. 5 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 12, 2023, 5:31 PM EDT (21:31 UTC)
- Expired
- Aug 12, 2023, 6:15 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 21:32 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 12, 5:32 PM EDT | TSTM WND DMG | 1 Nw Franconia Twp, PA | Trees down on wires resulting in power outages. Time estimated via radar. |
| Aug 12, 5:33 PM EDT | TSTM WND DMG | 1 Ssw Franconia Twp, PA | PPL reports tree limbs on wires near Harleysville and Franconia. Time estimated from radar. |
| Aug 12, 5:47 PM EDT | HAIL 0.25 | Hilltown Twp, PA | Pea size hail in Hilltown. Time estimated via radar. |
| Aug 12, 6:00 PM EDT | HAIL 1 | 1 Nw Plumstead Twp, PA | Pictures sent in of quarter-sized hail near Plumstead Township. Time estimated from radar. |
| Aug 12, 6:11 PM EDT | HAIL 1 | 2 Nne Gardenville, PA | Quarter size hail reported in Plumsteadville. Picture provided via social media. Time estimated via 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 198 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
- 1539 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
417
WUUS51 KPHI 122131
SVRPHI
PAC017-091-122215-
/O.NEW.KPHI.SV.W.0289.230812T2131Z-230812T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
531 PM EDT Sat Aug 12 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
* Until 615 PM EDT.
* At 531 PM EDT, a severe thunderstorm was located near Souderton, or
21 miles south of Allentown, moving east at 20 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...
Lansdale, Perkasie, Doylestown, Byram, Souderton, Bedminster,
Chalfont, Tinicum, Hatfield, New Hope, Dublin, Stockton, Green
Lane, Washington Crossing, Fricks, Pipersville, Gardenville, Spring
Mount, Richboro and Skippack.
This includes Northeast Extension between mile markers 28 and 38.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 4020 7542 4033 7548 4047 7507 4042 7506
4040 7504 4041 7499 4040 7496 4033 7494
4030 7487 4025 7485
TIME...MOT...LOC 2131Z 254DEG 17KT 4029 7538
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hoeflich2 follow-up statements
737
WWUS51 KPHI 122154
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
554 PM EDT Sat Aug 12 2023
PAC091-122204-
/O.CAN.KPHI.SV.W.0289.000000T0000Z-230812T2215Z/
Montgomery PA-
554 PM EDT Sat Aug 12 2023
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4023 7516 4031 7530 4038 7532 4046 7508
4042 7506 4040 7504 4041 7499 4040 7496
4033 7494 4031 7490 4025 7488
TIME...MOT...LOC 2154Z 257DEG 20KT 4032 7520
$$
PAC017-122215-
/O.CON.KPHI.SV.W.0289.000000T0000Z-230812T2215Z/
Bucks PA-
554 PM EDT Sat Aug 12 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR CENTRAL BUCKS COUNTY...
At 554 PM EDT, a severe thunderstorm was located over Chalfont, or 21
miles north of Philadelphia, moving east at 25 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...
Perkasie, Doylestown, Bedminster, Chalfont, Tinicum, New Hope,
Dublin, Stockton, Fricks, Pipersville, Gardenville, Richboro,
Sellersville, New Britain, Silverdale, Brittany Farms-Highlands and
Newtown Grant.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4023 7516 4031 7530 4038 7532 4046 7508
4042 7506 4040 7504 4041 7499 4040 7496
4033 7494 4031 7490 4025 7488
TIME...MOT...LOC 2154Z 257DEG 20KT 4032 7520
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hoeflich195
WWUS51 KPHI 122210
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
610 PM EDT Sat Aug 12 2023
PAC017-122220-
/O.EXP.KPHI.SV.W.0289.000000T0000Z-230812T2215Z/
Bucks PA-
610 PM EDT Sat Aug 12 2023
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS COUNTY WILL
EXPIRE AT 615 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until midnight EDT for
northwestern New Jersey...and southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4023 7516 4031 7530 4038 7532 4046 7508
4042 7506 4040 7504 4041 7499 4040 7496
4033 7494 4031 7490 4025 7488
TIME...MOT...LOC 2210Z 254DEG 17KT 4034 7511
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:57 PM EDT | Areal Flood Advisory | PHI | Delaware, Philadelphia | 3 hr |
| Aug 12, 1:38 PM EDT | Areal Flood Advisory | PHI | Delaware, Philadelphia | 3 hr |
| Aug 12, 3:06 PM EDT | Special Weather Statement | PHI | Berks | 24 min |
| Aug 12, 3:39 PM EDT | Special Weather Statement | PHI | Berks | 36 min |
| Aug 12, 3:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 41 min |
| Aug 12, 3:55 PM EDT | Special Weather Statement | PHI | Chester | 35 min |
| Aug 12, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 39 min |
| Aug 12, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 38 min |
| Aug 12, 4:57 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 48 min |
| Aug 12, 5:05 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 12, 5:16 PM EDT | Special Weather Statement | PHI | Delaware | 29 min |
| Aug 12, 6:42 PM EDT | Special Weather Statement | PHI | Montgomery | 33 min |
| Aug 12, 6:47 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 28 min |
| Aug 12, 6:58 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023
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.