Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 147, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 4:06 PM EDT for Berks County, Montgomery County, Pennsylvania. It was in force for 39 min. 2 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, 4:06 PM EDT (20:06 UTC)
- Expired
- Jul 8, 2021, 4:45 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Berks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 20:09 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, 4:06 PM EDT | TSTM WND DMG | Robeson Twp, PA | TREES WERE DOWNED IN ROBESON TWP. TIME ESTIMATED FROM RADAR. |
| Jul 8, 4:40 PM EDT | TSTM WND DMG | Washington Twp, PA | TREES WERE DOWNED IN WASHINGTON TWP. 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 214 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
- 272 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1291 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
298
WUUS51 KPHI 082006
SVRPHI
PAC011-091-082045-
/O.NEW.KPHI.SV.W.0147.210708T2006Z-210708T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
406 PM EDT Thu Jul 8 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Eastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
* Until 445 PM EDT.
* At 406 PM EDT, a severe thunderstorm was located over Birdsboro, or
near Reading, moving northeast 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...
Reading, Birdsboro, Kutztown, Fleetwood, Topton, Bally,
Bechtelsville, Lyons, New Morgan, Boyertown, Mount Penn, St.
Lawrence, Lorane, Reiffton, Amity Gardens and Flying Hills.
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 43 and 44.
Interstate 176 in Pennsylvania between mile markers 5 and 11.
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 4060 7577 4043 7550 4018 7583 4023 7597
TIME...MOT...LOC 2006Z 215DEG 21KT 4026 7586
HAIL...1.00IN
WIND...60MPH
$$
Staarmann2 follow-up statements
410
WWUS51 KPHI 082019
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
419 PM EDT Thu Jul 8 2021
PAC011-091-082045-
/O.CON.KPHI.SV.W.0147.000000T0000Z-210708T2045Z/
Berks PA-Montgomery PA-
419 PM EDT Thu Jul 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR EASTERN BERKS AND NORTHWESTERN MONTGOMERY COUNTIES...
At 419 PM EDT, a severe thunderstorm was located near Birdsboro, or 8
miles east of Reading, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Birdsboro, Kutztown, Fleetwood, Topton, Bally, Bechtelsville, Lyons,
Boyertown, St. Lawrence, Amity Gardens, Lorane and Reiffton.
This includes Interstate 78 in Pennsylvania between mile markers 43
and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4060 7577 4043 7550 4023 7576 4029 7589
TIME...MOT...LOC 2019Z 217DEG 21KT 4031 7577
HAIL...1.00IN
WIND...60MPH
$$
Staarmann752
WWUS51 KPHI 082029
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
429 PM EDT Thu Jul 8 2021
PAC011-091-082045-
/O.CON.KPHI.SV.W.0147.000000T0000Z-210708T2045Z/
Berks PA-Montgomery PA-
429 PM EDT Thu Jul 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHEASTERN BERKS AND NORTHWESTERN MONTGOMERY COUNTIES...
At 429 PM EDT, a severe thunderstorm was located near Bechtelsville,
or 12 miles east of Reading, moving northeast 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...
Kutztown, Topton, Bally, Bechtelsville, Lyons and Boyertown.
This includes Interstate 78 in Pennsylvania between mile markers 43
and 44.
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 4028 7570 4037 7582 4060 7577 4043 7550
TIME...MOT...LOC 2029Z 216DEG 22KT 4036 7570
HAIL...1.00IN
WIND...60MPH
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 41 min |
| Jul 8, 3:50 PM EDT | Special Weather Statement | PHI | Berks | 25 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, 5:29 PM EDT | Special Weather Statement | PHI | Northampton | 46 min |
| Jul 8, 5:52 PM EDT | Special Weather Statement | PHI | Berks | 23 min |
| Jul 8, 6:06 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 39 min |
| Jul 8, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 44 min |
Nearby
Severe 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.