Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 285, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2023, 3:49 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 41 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
- Aug 12, 2023, 3:49 PM EDT (19:49 UTC)
- Expired
- Aug 12, 2023, 4:30 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 19:49 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, 3:56 PM EDT | TSTM WND GST 45 | 1 S Reading Regional Ai, PA | ASOS station KRDG Reading. |
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, 7.8 hours before the alert went out and 213 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
- 176 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1236 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
567
WUUS51 KPHI 121949
SVRPHI
PAC011-029-091-122030-
/O.NEW.KPHI.SV.W.0285.230812T1949Z-230812T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
349 PM EDT Sat Aug 12 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
* Until 430 PM EDT.
* At 349 PM EDT, a severe thunderstorm was located over Reading,
moving east at 30 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...
Reading, Pottstown, Phoenixville, Wyomissing, Birdsboro,
Collegeville, Royersford, Sinking Spring, Laureldale, Trappe, East
Greenville, Leesport, Schwenksville, Bally, Bechtelsville, Green
Lane, Spring Mount, Gilbertsville, Spring Ridge and Cedarville.
This includes the following highways...
Northeast Extension between mile markers 36 and 39.
Interstate 176 in Pennsylvania between mile markers 10 and 11.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4046 7599 4041 7546 4035 7537 4011 7542
4032 7604
TIME...MOT...LOC 1949Z 280DEG 26KT 4034 7589
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hoeflich2 follow-up statements
981
WWUS51 KPHI 122013
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
413 PM EDT Sat Aug 12 2023
PAC029-122022-
/O.CAN.KPHI.SV.W.0285.000000T0000Z-230812T2030Z/
Chester PA-
413 PM EDT Sat Aug 12 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled. A Severe
Thunderstorm Warning remains in effect until 4:45 PM EDT for central
Chester County.
LAT...LON 4045 7586 4042 7553 4021 7555 4022 7559
4024 7560 4022 7561 4024 7565 4024 7568
4032 7587
TIME...MOT...LOC 2012Z 274DEG 18KT 4037 7578
$$
PAC011-091-122030-
/O.CON.KPHI.SV.W.0285.000000T0000Z-230812T2030Z/
Berks PA-Montgomery PA-
413 PM EDT Sat Aug 12 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL BERKS AND NORTHWESTERN MONTGOMERY COUNTIES...
At 412 PM EDT, a severe thunderstorm was located near Fleetwood, or 7
miles east of Reading, moving east at 20 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...
Pottstown, Bally, Bechtelsville, Gilbertsville, Stowe, Boyertown, St.
Lawrence, Pottsgrove, Amity Gardens, Sanatoga, Halfway House, South
Pottstown, Reiffton and Kenilworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4045 7586 4042 7553 4021 7555 4022 7559
4024 7560 4022 7561 4024 7565 4024 7568
4032 7587
TIME...MOT...LOC 2012Z 274DEG 18KT 4037 7578
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hoeflich126
WWUS51 KPHI 122022
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
422 PM EDT Sat Aug 12 2023
PAC011-091-122032-
/O.EXP.KPHI.SV.W.0285.000000T0000Z-230812T2030Z/
Berks PA-Montgomery PA-
422 PM EDT Sat Aug 12 2023
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS AND
NORTHWESTERN MONTGOMERY COUNTIES WILL EXPIRE AT 430 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4045 7586 4042 7553 4021 7555 4022 7559
4024 7560 4022 7561 4024 7565 4024 7568
4032 7587
TIME...MOT...LOC 2022Z 280DEG 26KT 4036 7570
$$
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, 3:55 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, 5:31 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 44 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.