Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 16, 2026, 9:54 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 66 min. 19 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
- Mar 16, 2026, 9:54 PM EDT (01:54 UTC)
- Expired
- Mar 16, 2026, 11:00 PM EDT
- In force
- 66 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), 118 km from the middle of the area, began a volume at 01:57 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 |
|---|---|---|---|
| Mar 16, 10:10 PM EDT | TSTM WND DMG | Glenmoore, PA | Tree down. Time estimated from radar. |
| Mar 16, 10:10 PM EDT | TSTM WND DMG | Honey Brook, PA | Several trees down with roads impassable. Time estimated from radar. |
| Mar 16, 10:11 PM EDT | TSTM WND GST 68 | Reading Regional Airpor, PA | |
| Mar 16, 10:18 PM EDT | TSTM WND DMG | 3 N West Sadsbury Twp, PA | Tree down in a house in West Caln Township, PA. A 500 gallon Propane Tank was knocked over as well. Time estimated from radar. |
| Mar 16, 10:24 PM EDT | TSTM WND DMG | 1 Nw Amity Gardens, PA | Several trees and wires down around Amity Township. Time estimated from radar. |
| Mar 16, 10:24 PM EDT | TSTM WND DMG | 1 Wnw Wernersville, PA | Trees and wires down near Wernersville and Robeson, PA. Time estimated from radar. |
| Mar 16, 10:25 PM EDT | TSTM WND GST 55 | 2 E Londonderry Twp, PA | Mesonet station DE031 West Grove - Seccra. |
| Mar 16, 10:25 PM EDT | TSTM WND GST 55 | 2 E Londonderry Twp, PA | Mesonet station DSCR White Clay Creek West Grove-SECCRA. |
| Mar 16, 10:26 PM EDT | TSTM WND DMG | 2 Sw Cedarville, PA | Tree down onto power lines on Chestnut Hill Road in North Coventry Township. Photo provided in report. Time estimated from radar. |
| Mar 16, 10:27 PM EDT | TSTM WND DMG | Pottstown, PA | Tree down on house causing damage to the roof. Time estimated from radar. |
| Mar 16, 10:28 PM EDT | TSTM WND DMG | West Vincent Twp, PA | Several trees and wires down in West Vincent Township. Time estimated from radar. |
| Mar 16, 10:30 PM EDT | TSTM WND DMG | 1 Ne Pottstown, PA | Several reports of trees and wires down across western Montgomery County, especially around Pottstown and Pottsgrove. Time estimated from radar. |
| Mar 16, 10:31 PM EDT | TSTM WND DMG | 1 Ene New Hanover Twp, PA | Tree down. Time estimated from radar. |
| Mar 16, 10:36 PM EDT | TSTM WND DMG | East Whiteland Twp, PA | Tree down into a house in East Whiteland Township. Multiple other reports of trees down, including some onto house in northern Chester County. No reported injuries. Time estimated from radar. |
| Mar 16, 10:36 PM EDT | TSTM WND DMG | East Whiteland Twp, PA | Tree fell into a house. Time estimated from radar. |
| Mar 16, 10:36 PM EDT | TSTM WND GST 55 | 2 Ese Sanatoga, PA | ASOS station KPTW Pottstown. |
| Mar 16, 10:37 PM EDT | TSTM WND DMG | 3 E Lower Pottsgrove Tw, PA | Tree down blocking the road near Neiffer Road and Swamp Pike. Time estimated from radar. |
| Mar 16, 10:41 PM EDT | TSTM WND DMG | 1 Wnw Lower Frederick T, PA | Tree down blocking the road near Zieglerville Road and North Gravel Pike. Time estimated from radar. |
| Mar 16, 10:43 PM EDT | TSTM WND GST 56 | 1 Nnw West Goshen, PA | AWOS station KOQN West Chester. |
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 00:00Z, 1.9 hours before the alert went out and 180 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
- 73 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 702 m above ground
- 0-6 km bulk shear
- 87 kt
- 0-1 km storm-relative helicity
- 249 m²/s²
- 0-3 km storm-relative helicity
- 333 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
437
WUUS51 KPHI 170154
SVRPHI
PAC011-029-091-170300-
/O.NEW.KPHI.SV.W.0011.260317T0154Z-260317T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
954 PM EDT Mon Mar 16 2026
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...
Chester County in southeastern Pennsylvania...
* Until 1100 PM EDT.
* At 953 PM EDT, a line of gusty showers were located along a line
extending from near Denver to near Octoraro, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Reading, West Chester, Pottstown, Phoenixville, Coatesville,
Westtown, Wyomissing, Downingtown, Kennett Square, Birdsboro,
Oxford, Royersford, Sinking Spring, Laureldale, Parkesburg, Trappe,
East Greenville, West Grove, Wernersville, and Honey Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 4048 7558 4040 7545 3992 7553 3993 7553
3988 7559 3984 7559 3982 7568 3977 7575
3972 7577 3972 7613 3976 7606 3983 7604
3987 7599 3995 7600 4004 7593 4011 7594
4014 7588 4033 7617
TIME...MOT...LOC 0153Z 256DEG 33KT 4026 7617 3963 7624
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hoeflich4 follow-up statements
823
WWUS51 KPHI 170214
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1014 PM EDT Mon Mar 16 2026
PAC011-029-091-170300-
/O.CON.KPHI.SV.W.0011.000000T0000Z-260317T0300Z/
Berks PA-Montgomery PA-Chester PA-
1014 PM EDT Mon Mar 16 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND CHESTER
COUNTIES...
At 1014 PM EDT, severe thunderstorms were located along a line
extending from near Denver to near Octoraro, and are nearly
stationary.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated. At 10:11 PM, Reading Regional Airport
(KRDG) gusted to 68 MPH.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Reading, West Chester, Pottstown, Phoenixville, Coatesville,
Westtown, Wyomissing, Downingtown, Kennett Square, Birdsboro, Oxford,
Royersford, Sinking Spring, Laureldale, Parkesburg, Trappe, East
Greenville, West Grove, Wernersville, and Honey Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 4048 7558 4040 7545 3992 7553 3993 7553
3988 7559 3984 7559 3982 7568 3977 7575
3972 7577 3972 7613 3976 7606 3983 7604
3987 7599 3995 7600 4004 7593 4011 7594
4014 7588 4033 7617
TIME...MOT...LOC 0214Z 256DEG 33KT 4026 7617 3963 7624
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Hoeflich697
WWUS51 KPHI 170227
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1027 PM EDT Mon Mar 16 2026
PAC011-029-091-170300-
/O.CON.KPHI.SV.W.0011.000000T0000Z-260317T0300Z/
Berks PA-Montgomery PA-Chester PA-
1027 PM EDT Mon Mar 16 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND CHESTER
COUNTIES...
At 1027 PM EDT, severe thunderstorms were located along a line
extending from 6 miles west of Bechtelsville to Kemblesville, moving
east at 65 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated. At 10:11 PM, Reading Regional Airport
gusted to 68 MPH.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Coatesville, Westtown,
Downingtown, Kennett Square, Birdsboro, Royersford, Trappe, East
Greenville, West Grove, Elverson, Bally, Bechtelsville, Green Lane,
Pughtown, Marshallton, Lionville-Marchwood, and Glenmoore.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3973 7594 4043 7577 4044 7573 4048 7558
4040 7545 3992 7553 3993 7553 3988 7559
3984 7559 3982 7568 3977 7575 3972 7577
TIME...MOT...LOC 0227Z 253DEG 57KT 4037 7576 3974 7583
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Hoeflich029
WWUS51 KPHI 170241
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1041 PM EDT Mon Mar 16 2026
PAC011-029-091-170300-
/O.CON.KPHI.SV.W.0011.000000T0000Z-260317T0300Z/
Berks PA-Montgomery PA-Chester PA-
1041 PM EDT Mon Mar 16 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR EAST CENTRAL BERKS...NORTHWESTERN MONTGOMERY AND EASTERN CHESTER
COUNTIES...
At 1040 PM EDT, a line of gusty showers were located along a line
extending from Bally to Ashland, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
West Chester, Pottstown, Phoenixville, Westtown, Royersford, Trappe,
East Greenville, Bally, Green Lane, Marshallton, Lionville-Marchwood,
Chester Springs, Geryville, Lionville, Gilbertsville, Spring Mount,
West Goshen, Boyertown, Pennsburg, and Spring City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3981 7570 4047 7561 4048 7558 4040 7545
3992 7553 3993 7553 3988 7559 3984 7559
3982 7568
TIME...MOT...LOC 0240Z 254DEG 34KT 4041 7559 3979 7567
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Hoeflich176
WWUS51 KPHI 170250
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1050 PM EDT Mon Mar 16 2026
PAC011-029-091-170300-
/O.EXP.KPHI.SV.W.0011.000000T0000Z-260317T0300Z/
Berks PA-Montgomery PA-Chester PA-
1050 PM EDT Mon Mar 16 2026
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS...
NORTHWESTERN MONTGOMERY AND EASTERN CHESTER COUNTIES WILL EXPIRE AT
1100 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until midnight EDT for
northern Delaware.
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 3981 7570 4047 7561 4048 7558 4040 7545
3992 7553 3993 7553 3988 7559 3984 7559
3982 7568
TIME...MOT...LOC 0250Z 256DEG 33KT 4043 7550 3981 7558
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 16, 10:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Northampton | 57 min |
| Mar 16, 10:32 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 58 min |
| Mar 16, 11:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 59 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Every severe thunderstorm warning in 2026
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.