Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2020, 12:23 PM EDT for 5 counties in Pennsylvania. It was in force for 52 min. 14 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
- Apr 9, 2020, 12:23 PM EDT (16:23 UTC)
- Expired
- Apr 9, 2020, 1:15 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 16:23 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 |
|---|---|---|---|
| Apr 9, 12:24 PM EDT | TSTM WND DMG | Reading, PA | PHOTOS OF SEVERAL LARGE TREES DOWN IN THE AREA. TIME ESTIMATED FROM RADAR. |
| Apr 9, 12:29 PM EDT | HAIL 0.25 | Exeter Twp, PA | |
| Apr 9, 12:36 PM EDT | HAIL 0.25 | Wyomissing, PA | |
| Apr 9, 12:40 PM EDT | HAIL 0.25 | Gilbertsville, PA | PEA SIZE HAIL REPORTED IN GILBERTSVILLE. |
| Apr 9, 12:42 PM EDT | TSTM WND DMG | Boyertown, PA | UTILITY POLE SNAPPED IN HALF IN BOYERTOWN. TIME ESTIMATED FROM RADAR. |
| Apr 9, 12:42 PM EDT | HAIL 0.25 | 2 Wsw Red Hill, PA | |
| Apr 9, 12:47 PM EDT | HAIL 0.25 | 1 Ne East Vincent Twp, PA | BRIEF PERIOD OF PEA SIZED HAIL. |
| Apr 9, 12:48 PM EDT | TSTM WND DMG | Perkiomenville, PA | TREES AND WIRES DOWN. PEA SIZE HAIL ALSO REPORTED. |
| Apr 9, 12:50 PM EDT | TSTM WND DMG | 2 W Phoenixville, PA | TREE DOWN NEAR TOWNSHIP LINE ROAD AND NUTT ROAD. |
| Apr 9, 12:50 PM EDT | HAIL 0.25 | Trumbauersville, PA | |
| Apr 9, 12:50 PM EDT | HAIL 0.7 | Boyertown, PA | |
| Apr 9, 12:54 PM EDT | TSTM WND DMG | 1 Nw Sellersville, PA | SEVERAL REPORTS OF DOWNED TREES AND WIRES IN THE AREA. TIME ESTIMATED FROM RADAR. |
| Apr 9, 1:00 PM EDT | TSTM WND DMG | 1 E Oaks, PA | TREE DOWN ON A HOUSE IN LOWER PROVIDENCE TOWNSHIP. |
| Apr 9, 1:05 PM EDT | TSTM WND DMG | 1 N Reading, PA | VIDEO POSTED TO SOCIAL MEDIA SHOWS NUMEROUS TREES UPROOTED AND DOWNED, AS WELL AS NUMEROUS DOWNED POWER LINES. TIME ESTIMATED. |
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 |
|---|---|---|---|
| Apr 9, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 4.4 hours before the alert went out and 192 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
- 20 J/kg
- Mixed-layer CIN
- -589 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 394 m²/s²
- 0-3 km storm-relative helicity
- 416 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
750
WUUS51 KPHI 091623
SVRPHI
PAC011-017-029-077-091-091715-
/O.NEW.KPHI.SV.W.0016.200409T1623Z-200409T1715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1223 PM EDT Thu Apr 9 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Berks County in eastern Pennsylvania...
South central Lehigh County in eastern Pennsylvania...
Montgomery County in southeastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Chester County in southeastern Pennsylvania...
* Until 115 PM EDT.
* At 1222 PM EDT, severe thunderstorms were located along a line
extending from Laureldale to near Adamstown to near Strasburg,
moving east at 55 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, West Chester, Norristown, Pottstown, Phoenixville,
Lansdale, West Norriton, East Norriton, Coatesville, Wyomissing,
Quakertown, Perkasie, Downingtown, Souderton, Bedminster,
Birdsboro, Collegeville, Royersford, Fleetwood and Chalfont.
This includes the following highways...
Pennsylvania Turnpike between exits 298 and 326.
Northeast Extension between exits A31 and A44.
Interstate 176 in Pennsylvania between mile markers 1 and 11.
Interstate 76 in Pennsylvania near mile marker 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
&&
LAT...LON 4044 7597 4050 7510 4021 7526 3991 7558
3994 7598 3994 7599 3995 7600 4004 7593
4011 7594 4014 7588 4026 7607
TIME...MOT...LOC 1622Z 266DEG 49KT 4039 7592 4023 7601 4003 7621
HAIL...0.75IN
WIND...60MPH
$$
MPS2 follow-up statements
223
WWUS51 KPHI 091652
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1252 PM EDT Thu Apr 9 2020
PAC011-077-091701-
/O.CAN.KPHI.SV.W.0016.000000T0000Z-200409T1715Z/
Berks PA-Lehigh PA-
1252 PM EDT Thu Apr 9 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS AND SOUTH
CENTRAL LEHIGH COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
southeastern Pennsylvania.
LAT...LON 4020 7565 4048 7542 4050 7510 4020 7526
3993 7556 3994 7595
TIME...MOT...LOC 1651Z 265DEG 46KT 4046 7534 4020 7552 3999 7577
$$
PAC017-029-091-091715-
/O.CON.KPHI.SV.W.0016.000000T0000Z-200409T1715Z/
Montgomery PA-Bucks PA-Chester PA-
1252 PM EDT Thu Apr 9 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR CENTRAL MONTGOMERY...NORTHWESTERN BUCKS AND CENTRAL CHESTER
COUNTIES...
At 1251 PM EDT, severe thunderstorms were located along a line
extending from Quakertown to Royersford to near Coatesville, moving
east at 50 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...
West Chester, Norristown, Pottstown, Phoenixville, Lansdale, West
Norriton, East Norriton, Coatesville, Quakertown, Perkasie,
Downingtown, Souderton, Bedminster, Collegeville, Royersford,
Chalfont, Parkesburg, Trappe, Hatfield and Dublin.
This includes the following highways...
Pennsylvania Turnpike between exits 312 and 326.
Northeast Extension between exits A31 and A44.
Interstate 76 in Pennsylvania near mile marker 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
&&
LAT...LON 4020 7565 4048 7542 4050 7510 4020 7526
3993 7556 3994 7595
TIME...MOT...LOC 1651Z 265DEG 46KT 4046 7534 4020 7552 3999 7577
HAIL...0.75IN
WIND...60MPH
$$
MPS587
WWUS51 KPHI 091705
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
105 PM EDT Thu Apr 9 2020
PAC017-029-091-091715-
/O.EXP.KPHI.SV.W.0016.000000T0000Z-200409T1715Z/
Montgomery PA-Bucks PA-Chester PA-
105 PM EDT Thu Apr 9 2020
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY...
NORTHWESTERN BUCKS AND CENTRAL CHESTER COUNTIES WILL EXPIRE AT 115 PM
EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However, gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4020 7565 4048 7542 4050 7510 4020 7526
3993 7556 3994 7595
TIME...MOT...LOC 1705Z 266DEG 49KT 4047 7513 4021 7531 4000 7556
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 12:05 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 40 min |
| Apr 9, 1:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 45 min |
| Apr 9, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 48 min |
| Apr 9, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Apr 9, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Apr 9, 1:33 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Philadelphia | 42 min |
| Apr 9, 3:32 PM EDT | Wind Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 27 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Every severe thunderstorm warning in 2020
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.