Alert archive / Pennsylvania / Tornado Warnings in 2021
Tornado Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Aug 19, 2021, 12:26 AM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 34 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
- Aug 19, 2021, 12:26 AM EDT (04:26 UTC)
- Expired
- Aug 19, 2021, 1:00 AM EDT
- In force
- 34 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 04:25 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 |
|---|---|---|---|
| Aug 19, 12:27 AM EDT | TSTM WND DMG | 1 Ese Souderton, PA | DOWNED TREES AND WIRES AND SOME DAMAGE TO HOMES IN THE AREA OF DEERFIELD DRIVE AND TOWNSHIP LINE ROAD. TIME ESTIMATED FROM RADAR. POSSIBLE TORNADO DAMAGE. |
| Aug 19, 12:33 AM EDT | TSTM WND DMG | 1 E Perkasie, PA | WIRES DOWN NEAR PERKASIE. LIKELY TORNADO DAMAGE. TIME BASED ON RADAR AND APPARENT TORNADO DEBRIS SIGNATURE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 4.4 hours before the alert went out and 213 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
- 491 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
313
WFUS51 KPHI 190426
TORPHI
PAC017-091-190500-
/O.NEW.KPHI.TO.W.0030.210819T0426Z-210819T0500Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1226 AM EDT Thu Aug 19 2021
The National Weather Service in Mount Holly NJ has issued a
* Tornado Warning for...
Central Montgomery County in southeastern Pennsylvania...
West central Bucks County in southeastern Pennsylvania...
* Until 100 AM EDT.
* At 1226 AM EDT, a severe thunderstorm capable of producing a
tornado was located over Hatfield, or 21 miles northwest of
Philadelphia, moving northeast at 30 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...
Lansdale, Perkasie, Doylestown, Souderton, Bedminster, Chalfont,
Hatfield, Dublin, Fricks, Gardenville, Telford, Sellersville, New
Britain, Silverdale, Harleysville, Kulpsville and Montgomeryville.
This includes Northeast Extension between mile markers 29 and 35.
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 4022 7534 4027 7544 4047 7524 4036 7505
TIME...MOT...LOC 0426Z 227DEG 25KT 4028 7532
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Meola2 follow-up statements
822
WWUS51 KPHI 190433
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1233 AM EDT Thu Aug 19 2021
PAC091-190442-
/O.CAN.KPHI.TO.W.0030.000000T0000Z-210819T0500Z/
Montgomery PA-
1233 AM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR CENTRAL MONTGOMERY COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 4047 7524 4038 7509 4027 7524 4028 7525
4034 7536 4035 7536
TIME...MOT...LOC 0432Z 218DEG 32KT 4033 7528
$$
PAC017-190500-
/O.CON.KPHI.TO.W.0030.000000T0000Z-210819T0500Z/
Bucks PA-
1233 AM EDT Thu Aug 19 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR WEST
CENTRAL BUCKS COUNTY...
At 1232 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Souderton, or 20 miles southeast of Allentown,
moving northeast 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...
Perkasie, Souderton, Bedminster, Chalfont, Dublin, Fricks,
Gardenville, Telford, Sellersville and Silverdale.
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.
Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4047 7524 4038 7509 4027 7524 4028 7525
4034 7536 4035 7536
TIME...MOT...LOC 0432Z 218DEG 32KT 4033 7528
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Meola579
WWUS51 KPHI 190451
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1251 AM EDT Thu Aug 19 2021
PAC017-190501-
/O.EXP.KPHI.TO.W.0030.000000T0000Z-210819T0500Z/
Bucks PA-
1251 AM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR WEST CENTRAL BUCKS COUNTY WILL EXPIRE AT
100 AM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
LAT...LON 4047 7524 4038 7509 4027 7524 4028 7525
4034 7536 4035 7536
TIME...MOT...LOC 0451Z 227DEG 25KT 4041 7517
$$
MeolaThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:53 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 18, 9:10 PM EDT | Areal Flood Advisory | PHI | Lehigh, Monroe, Northampton | 3 hr |
| Aug 18, 9:30 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 18, 9:35 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 3 hr |
| Aug 18, 9:45 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 18, 9:47 PM EDT | Special Weather Statement | PHI | Berks | 58 min |
| Aug 18, 10:16 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 3 hr |
| Aug 18, 10:44 PM EDT | Flash Flood Warning | PHI | Lehigh, Monroe, Northampton | 4 hr |
| Aug 18, 10:50 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Aug 18, 11:19 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 3 hr |
| Aug 18, 11:19 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery | 41 min |
| Aug 18, 11:47 PM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Aug 19, 12:04 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Montgomery | 71 min |
| Aug 19, 12:31 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 4 hr |
| Aug 19, 12:44 AM EDT | River Flood Warning | PHI | Chester | 5 hr |
| Aug 19, 12:47 AM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 28 min |
| Aug 19, 12:48 AM EDT | Tornado Warning | PHI | Bucks | 27 min |
| Aug 19, 1:14 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Philadelphia | 91 min |
| Aug 19, 1:30 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 19, 2:05 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 19, 2:13 AM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 4 hr |
| Aug 19, 4:33 AM EDT | Areal Flood Warning | PHI | Chester, Delaware | 4 hr |
| Aug 19, 6:09 AM EDT | Areal Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Aug 19, 8:50 AM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 3 hr |
| Aug 19, 10:40 AM EDT | Areal Flood Warning | PHI | Delaware | 3 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.