Alert archive / Pennsylvania / Tornado Warnings in 2021
Tornado Warning 52, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Sep 8, 2021, 10:23 PM EDT for Berks County, Pennsylvania. It was in force for 22 min. 7 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
- Sep 8, 2021, 10:23 PM EDT (02:23 UTC)
- Expired
- Sep 8, 2021, 10:45 PM EDT
- In force
- 22 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Berks County, PA
The radar
The Philadelphia radar (KDIX), 151 km from the middle of the area, began a volume at 02:23 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 |
|---|---|---|---|
| Sep 8, 10:28 PM EDT | TSTM WND DMG | 2 S Robesonia, PA | TREE AND WIRES DOWN IN SOUTH HEIDELBERG TOWNSHIP. TIME ESTIMATED FROM RADAR. |
| Sep 8, 10:32 PM EDT | TSTM WND DMG | 1 Ssw Wernersville, PA | TREES DOWN ON PREMISES OF WERNERSVILLE STATE HOSPITAL. TIME ESTIMATED FROM RADAR. |
| Sep 8, 10:40 PM EDT | TSTM WND DMG | 1 N Spring Twp, PA | MULTIPLE TREES AND POWERLINES DOWN ON HOUSES AND VEHICLES. |
| Sep 8, 10:40 PM EDT | TSTM WND DMG | West Lawn, PA | TREE ON GARAGE ON CLEVELAND AVENUE IN SPRING TOWNSHIP. TIME ESTIMATED FROM RADAR. |
| Sep 8, 10:42 PM EDT | TSTM WND DMG | Wyomissing, PA | TREE DOWN ON GARAGE, TIME ESTIMATED FROM RADAR. |
| Sep 8, 10:43 PM EDT | TSTM WND DMG | Bern Twp, PA | MULTIPLE LARGE TREES DOWN. TIME ESTIMATED FROM RADAR. |
| Sep 8, 10:48 PM EDT | TSTM WND DMG | Shillington, PA | TREE AND WIRES DOWN ON 601 BROBST STREET IN SHILLINGTON BOROUGH. 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 |
|---|---|---|---|
| Sep 8, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 2.4 hours before the alert went out and 193 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
- 1652 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 1146 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 7.0
The text
As transmitted.
340
WFUS51 KPHI 090223
TORPHI
PAC011-090300-
/O.NEW.KPHI.TO.W.0052.210909T0223Z-210909T0300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1023 PM EDT Wed Sep 8 2021
The National Weather Service in Mount Holly NJ has issued a
* Tornado Warning for...
Central Berks County in eastern Pennsylvania...
* Until 1100 PM EDT.
* At 1022 PM EDT, a severe thunderstorm capable of producing a
tornado was located over Womelsdorf, or near Myerstown, moving east
at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* Locations impacted include...
Reading, Wyomissing, Sinking Spring, Laureldale, Womelsdorf,
Wernersville, Robesonia, Leesport, Bernville, Fairview Hgts, Spring
Ridge, Shillington, West Reading, Mohnton, Kenhorst, Wyomissing
Hills, West Lawn, Whitfield and West Wyomissing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4040 7624 4051 7584 4027 7595 4027 7608
4037 7623
TIME...MOT...LOC 0222Z 251DEG 31KT 4036 7618
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JEO2 follow-up statements
447
WWUS51 KPHI 090233
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1033 PM EDT Wed Sep 8 2021
PAC011-090300-
/O.CON.KPHI.TO.W.0052.000000T0000Z-210909T0300Z/
Berks PA-
1033 PM EDT Wed Sep 8 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT FOR CENTRAL
BERKS COUNTY...
At 1033 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Fairview Hgts, or 7 miles northwest of Reading,
moving east at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Reading, Wyomissing, Sinking Spring, Laureldale, Wernersville,
Robesonia, Leesport, Bernville, Fairview Hgts, Spring Ridge,
Shillington, West Reading, Mohnton, Kenhorst, Wyomissing Hills, West
Lawn, Whitfield and West Wyomissing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4029 7594 4030 7608 4037 7615 4042 7616
4051 7584
TIME...MOT...LOC 0233Z 251DEG 31KT 4039 7606
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
JEO107
WWUS51 KPHI 090245
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1045 PM EDT Wed Sep 8 2021
PAC011-090254-
/O.CAN.KPHI.TO.W.0052.000000T0000Z-210909T0300Z/
Berks PA-
1045 PM EDT Wed Sep 8 2021
...THE TORNADO WARNING FOR CENTRAL BERKS COUNTY IS CANCELLED...
The rotation which prompted the warning has weakened, and no longer
appears capable of producing a tornado. Therefore, the
Tornado Warning has been cancelled.
However, a Severe Thunderstorm Warning still remains in effect for
this area, and damaging straight line winds remain possible.
LAT...LON 4029 7594 4030 7608 4037 7615 4042 7616
4051 7584
TIME...MOT...LOC 0243Z 251DEG 31KT 4042 7594
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 8:47 PM EDT | Special Weather Statement | PHI | Northampton | 28 min |
| Sep 8, 9:12 PM EDT | Special Weather Statement | PHI | Lehigh | 48 min |
| Sep 8, 9:16 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 3 hr |
| Sep 8, 9:16 PM EDT | Special Weather Statement | PHI | Northampton | 29 min |
| Sep 8, 9:38 PM EDT | Special Weather Statement | PHI | Berks | 52 min |
| Sep 8, 9:46 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 44 min |
| Sep 8, 9:48 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 7 hr |
| Sep 8, 9:59 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Sep 8, 10:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 49 min |
| Sep 8, 10:27 PM EDT | Special Weather Statement | PHI | Northampton | 33 min |
| Sep 8, 10:42 PM EDT | Flash Flood Warning | PHI | Northampton | 6 hr |
| Sep 8, 10:47 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 3 hr |
| Sep 8, 10:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 58 min |
| Sep 8, 10:56 PM EDT | Special Weather Statement | PHI | Northampton | 34 min |
| Sep 8, 11:27 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 48 min |
| Sep 8, 11:35 PM EDT | Special Weather Statement | PHI | Chester, Delaware, Montgomery | 40 min |
| Sep 9, 12:08 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Montgomery, Philadelphia | 37 min |
| Sep 9, 4:26 AM EDT | Areal Flood Warning | PHI | Lehigh, Northampton | 3 hr |
| Sep 9, 4:28 AM EDT | Areal Flood Warning | PHI | Northampton | 4 hr |
Nearby
Tornado Warnings in Pennsylvania, 2021Every tornado warning in 2021Tornadoes 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.