Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 26, 2021, 4:46 PM EDT for 6 counties in Pennsylvania. It was in force for 44 min. 30 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
- May 26, 2021, 4:46 PM EDT (20:46 UTC)
- Expired
- May 26, 2021, 5:30 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 96 km from the middle of the area, began a volume at 20:48 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 |
|---|---|---|---|
| May 26, 4:48 PM EDT | TSTM WND DMG | 3 W Douglass Twp, PA | DOWNED TREE ON POWDER MILL HOLLOW ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 4:50 PM EDT | TSTM WND DMG | 1 Nw Bally, PA | DOWNED TREES AND WIRES NEAR HILLCREST ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 4:53 PM EDT | TSTM WND DMG | 1 Ene Huffs Church, PA | DOWNED TREES AND WIRES NEAR MULBERRY HILL ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 4:53 PM EDT | TSTM WND DMG | 1 Nnw Colebrookdale Twp, PA | DOWNED TREES AND WIRES NEAR IRONSTONE DRIVE. TIME ESTIMATED FROM RADAR. |
| May 26, 4:55 PM EDT | TSTM WND DMG | 1 Nnw Upper Hanover Twp, PA | DOWNED TREE ON ZIEGLER ROAD NEAR GRAVEL PIKE. TIME ESTIMATED FROM RADAR. |
| May 26, 4:55 PM EDT | TSTM WND DMG | Allentown, PA | SOCIAL MEDIA PHOTO OF A SNAPPED TREE IN A NEIGHBORHOOD NEAR ALLENTOWN. TIME CORRECTED BASED ON RADAR. |
| May 26, 4:58 PM EDT | TSTM WND DMG | 1 Ese New Hanover Twp, PA | DOWNED TREE ON REIFSNYDER ROAD NEAR SWAMP PICNIC ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 4:58 PM EDT | TSTM WND DMG | 2 Ese Douglass Twp, PA | DOWNED TREES AND WIRES NEAR FARMINGTON AVENUE ON THE BERKS/MONTGOMERY COUNTY BORDER. TIME ESTIMATED FROM RADAR. |
| May 26, 4:58 PM EDT | TSTM WND DMG | 2 W Upper Hanover Twp, PA | DOWNED TREE IN WIRES ON KUTZTOWN ROAD NEAR TOWNSHIP WOODS ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:00 PM EDT | TSTM WND GST 40 | 1 Se Macungie, PA | CWOP MEASURED GUST. |
| May 26, 5:05 PM EDT | TSTM WND DMG | 1 Wnw Perkiomenville, PA | SEVERAL DOWNED TREES AND A POWER POLE DOWN. TIME ESTIMATED FROM RADAR. |
| May 26, 5:05 PM EDT | TSTM WND DMG | 1 W Upper Salford Twp, PA | DOWNED TREE ON SALFORD STATION ROAD NEAR CEPP ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:05 PM EDT | TSTM WND DMG | 2 Wsw Red Hill, PA | DOWNED TREE ON WARD ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:05 PM EDT | TSTM WND DMG | 3 E Zionsville, PA | DOWNED TREE NEAR THE INTERSECTION OF LIMEPORT PIKE AND CHESTNUT HILL CHURCH ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:07 PM EDT | TSTM WND DMG | 1 Wnw Sellersville, PA | SEVERAL REPORTS OF DOWNED TREES AND WIRES NEAR AND WEST OF SELLERSVILLE. TIME ESTIMATED FROM RADAR. |
| May 26, 5:09 PM EDT | TSTM WND DMG | 1 Ene West Rockhill Twp, PA | DOWNED TREES AND WIRES NEAR MOUNTAIN VIEW ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:10 PM EDT | TSTM WND DMG | 1 S Milford Twp, PA | DOWNED TREE LIMBS AND WIRES NEAR WALNUT LANE. TIME ESTIMATED FROM RADAR. |
| May 26, 5:12 PM EDT | HAIL 0.7 | Gilbertsville, PA | |
| May 26, 5:14 PM EDT | TSTM WND DMG | Hellertown, PA | DOWNED TREES AND WIRES NEAR FRONT STREET. TIME ESTIMATED FROM RADAR. |
| May 26, 5:16 PM EDT | TSTM WND DMG | 2 Wnw Richland Twp, PA | DOWNED TREES AND WIRES NEAR KELLERS ROAD AND MINE ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:18 PM EDT | HAIL 0.75 | 1 Wnw Washington Twp, PA | REPORT FROM BARTO. |
| May 26, 5:20 PM EDT | TSTM WND GST 60 | 1 Ne Salford Twp, PA | BROADCAST METEOROLOGIST ESTIMATES 60-65 MPH WIND GUSTS NEAR ALLENTOWN ROAD AND COUNTY LINE ROAD. |
| May 26, 5:21 PM EDT | TSTM WND DMG | 1 Ne Montgomeryville, PA | DOWNED TREES AND WIRES NEAR COUNTY LINE ROAD AND BUSINESS ROUTE 202. TIME ESTIMATED FROM RADAR. |
| May 26, 5:21 PM EDT | TSTM WND DMG | 1 W Ottsville, PA | DOWNED TREES AND WIRES NEAR PARK ROAD. TIME ESTIMATED FROM RADAR AND UTILITY REPORT. |
| May 26, 5:22 PM EDT | TSTM WND DMG | Williams Twp, PA | DOWNED TREE LIMBS AND WIRES NORTH OF RAUBSVILLE ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:23 PM EDT | TSTM WND DMG | 2 N Blue Bell, PA | DOWNED TREE BLOCKING OVERBROOK DRIVE NEAR GWYNEDD VALLEY DRIVE. TIME ESTIMATED FROM RADAR. |
| May 26, 5:25 PM EDT | TSTM WND DMG | 1 Sw Durham Twp, PA | DOWNED TREES AND WIRES NEAR ROUTE 212 IN DURHAM TWP. TIME ESTIMATED FROM RADAR. |
| May 26, 5:25 PM EDT | TSTM WND DMG | 2 Nw Riegelsville, PA | DOWNED TREE LIMBS AND WIRES NEAR COFFETOWN ROAD. TIME ESTIMATED FROM RADAR. |
| May 26, 5:30 PM EDT | TSTM WND DMG | 1 Ssw Phoenixville, PA | DOWNED TREE LIMBS ON FOURTH AVENUE AND LINCOLN AVENUE. TIME ESTIMATED FROM RADAR. |
| May 26, 5:35 PM EDT | HAIL 0.88 | Bedminster, PA | 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 |
|---|---|---|---|
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.8 hours before the alert went out and 217 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
- 5 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 554 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 164 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
334
WUUS51 KPHI 262046
SVRPHI
PAC011-017-029-077-091-095-262130-
/O.NEW.KPHI.SV.W.0030.210526T2046Z-210526T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
446 PM EDT Wed May 26 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Berks County in eastern Pennsylvania...
Southeastern Lehigh County in eastern Pennsylvania...
Montgomery County in southeastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
South central Northampton County in eastern Pennsylvania...
* Until 530 PM EDT.
* At 445 PM EDT, severe thunderstorms were located along a line
extending from near Coffeetown to near Bechtelsville to New Morgan,
moving east at 45 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Allentown, Easton, Bethlehem, Norristown, Pottstown, Phoenixville,
Lansdale, West Norriton, East Norriton, Emmaus, Quakertown,
Perkasie, Doylestown, Souderton, Bedminster, Hellertown,
Collegeville, Royersford, Chalfont and Tinicum.
This includes the following highways...
Pennsylvania Turnpike between mile markers 298 and 304, and between
mile markers 330 and 333.
Northeast Extension between mile markers 21 and 53.
Interstate 78 in Pennsylvania between mile markers 57 and 73.
Interstate 476 in Pennsylvania between mile markers 18 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
These storms are producing widespread wind damage across Berks
County. SEEK SHELTER NOW inside a sturdy structure and stay away
from windows!
&&
LAT...LON 4041 7564 4065 7545 4064 7519 4057 7519
4057 7516 4058 7512 4054 7507 4045 7507
4042 7506 4041 7499 4009 7530 4013 7589
4014 7588 4015 7590
TIME...MOT...LOC 2045Z 269DEG 40KT 4062 7555 4043 7567 4020 7591
HAIL...0.75IN
WIND...70MPH
$$
Meola1 follow-up statement
917
WWUS51 KPHI 262119
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
519 PM EDT Wed May 26 2021
PAC011-017-029-077-091-095-262130-
/O.CON.KPHI.SV.W.0030.000000T0000Z-210526T2130Z/
Berks PA-Lehigh PA-Montgomery PA-Bucks PA-Chester PA-Northampton PA-
519 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN BERKS...SOUTHEASTERN LEHIGH...MONTGOMERY...
NORTHWESTERN BUCKS...NORTHEASTERN CHESTER AND SOUTH CENTRAL
NORTHAMPTON COUNTIES...
At 518 PM EDT, severe thunderstorms were located along a line
extending from Springtown to near Geryville to Pughtown, moving east
at 30 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Bethlehem, Norristown, Pottstown, Phoenixville, Lansdale, West
Norriton, East Norriton, Quakertown, Perkasie, Doylestown, Souderton,
Bedminster, Hellertown, Collegeville, Royersford, Chalfont, Tinicum,
Trappe, Hatfield and East Greenville.
This includes the following highways...
Pennsylvania Turnpike between mile markers 298 and 304, and between
mile markers 330 and 333.
Northeast Extension between mile markers 21 and 48.
Interstate 78 in Pennsylvania between mile markers 66 and 72.
Interstate 476 in Pennsylvania between mile markers 18 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
These storms are producing widespread wind damage across Berks
county. SEEK SHELTER NOW inside a sturdy structure and stay away
from windows.
&&
LAT...LON 4040 7556 4064 7532 4064 7519 4057 7519
4057 7516 4058 7512 4054 7507 4045 7507
4042 7506 4041 7499 4009 7530 4013 7589
4014 7588 4015 7590 4025 7580
TIME...MOT...LOC 2118Z 273DEG 27KT 4058 7529 4039 7541 4016 7565
HAIL...0.75IN
WIND...70MPH
$$
DealThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 3:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 56 min |
| May 26, 4:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 65 min |
| May 26, 4:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 38 min |
| May 26, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 48 min |
| May 26, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 41 min |
| May 26, 5:37 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 53 min |
| May 26, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 67 min |
| May 26, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 38 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.