Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 402, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 31, 2019, 10:23 PM EDT for Bucks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland. It was in force for 67 min. 11 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
- Oct 31, 2019, 10:23 PM EDT (02:23 UTC)
- Expired
- Oct 31, 2019, 11:30 PM EDT
- In force
- 67 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cecil County, MD, Bucks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 02:25 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 |
|---|---|---|---|
| Oct 31, 10:23 PM EDT | TSTM WND DMG | 2 Sw East Brandywine Tw, PA | LARGE TREE DOWN NEAR THE INTERSECTION OF REECEVILLE ROAD AND CALN MEETINGHOUSE ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:09 PM EDT | TSTM WND DMG | 1 Ne Uwchlan Twp, PA | REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:16 PM EDT | TSTM WND DMG | 2 Ne Kennett Square, PA | DOWNED TREE ON U.S. HIGHWAY 1 NEAR SCHOOL HOUSE ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:21 PM EDT | TSTM WND DMG | 2 S Westtown, PA | DOWNED TREE ON DILWORTHTOWN ROAD NEAR BINTON LAKE ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:24 PM EDT | TSTM WND DMG | 1 Ene Westtown, PA | DOWNED TREE NEAR THE INTERSECTION OF ROUTE 926 AND WESTTOWN ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:24 PM EDT | TSTM WND DMG | 1 Nnw West Goshen, PA | DOWNED TREE ON FERN HILL ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:25 PM EDT | TORNADO | Glen Mills, PA | *** 2 INJ *** A TORNADO EMBEDDED IN A LARGER AREA OF STRAIGHT LINE WINDS TOUCHED DOWN JUST SOUTHWEST OF THE COBBLESTONE AT THORNBURY SUBDIVISION IN THE TOWN OF GLEN MILLS, DELAWARE COUNTY AT 11:25 PM EDT, THURSDAY, OCTOBER 31, 2019. DAMAGE NEAR THE BEGINNING O |
| Oct 31, 11:29 PM EDT | TSTM WND DMG | Kintnersville, PA | DOWNED TREE ON STATE HIGHWAY 611 NEAR KINTNER ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:32 PM EDT | TSTM WND DMG | 1 Se Berwyn, PA | DOWNED TREE AND WIRES NEAR THE INTERSECTION OF SUGARTOWN ROAD AND FAIRFIELD ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:34 PM EDT | TSTM WND DMG | 1 Nw Wayne, PA | MULTIPLE TREES SNAPPED WITH LARGE LIMBS DOWN AT ST. DAVIDS GOLF CLUB IN WAYNE. TIME ESTIMATED FROM RADAR. |
| Oct 31, 11:37 PM EDT | TSTM WND DMG | 1 Wsw West Conshohocken, PA | DOWNED TREE NEAR THE INTERSTATE 76 AND 476 INTERCHANGE. 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 |
|---|---|---|---|
| Oct 31, 7:56 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 2.4 hours before the alert went out and 201 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
- 529 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 827 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 623 m²/s²
- 0-3 km storm-relative helicity
- 752 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.8
The text
As transmitted.
188
WUUS51 KPHI 010223
SVRPHI
MDC015-PAC017-029-091-010330-
/O.NEW.KPHI.SV.W.0402.191101T0223Z-191101T0330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1023 PM EDT Thu Oct 31 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Cecil County in northeastern Maryland...
Montgomery County in southeastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Chester County in southeastern Pennsylvania...
* Until 1130 PM EDT.
* At 1023 PM EDT, severe thunderstorms were located along a line
extending from East Greenville to near Aberdeen, moving northeast
at 65 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
West Chester, Elkton, Calvert, Norristown, Pottstown, Phoenixville,
Lansdale, West Norriton, East Norriton, Coatesville, Westtown,
Quakertown, Perkasie, Doylestown, Downingtown, Conshohocken,
Souderton, Bedminster, Ambler and Kennett Square.
This includes the following highways...
Interstate 95 in Maryland between mile markers 91 and 109.
Interstate 95 in Delaware near mile marker 0.
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 3976 7606 3987 7599 4011 7594 4023 7571
4037 7559 4058 7527 4061 7520 4057 7518
4057 7511 4042 7506 4041 7499 4003 7532
4006 7535 4006 7536 3984 7559 3972 7579
3952 7578 3955 7608 3972 7623
TIME...MOT...LOC 0223Z 237DEG 55KT 4039 7553 3958 7622
HAIL...<.75IN
WIND...60MPH
$$
Iovino1 follow-up statement
306
WWUS51 KPHI 010301
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1101 PM EDT Thu Oct 31 2019
MDC015-PAC017-029-091-010330-
/O.CON.KPHI.SV.W.0402.000000T0000Z-191101T0330Z/
Cecil MD-Montgomery PA-Bucks PA-Chester PA-
1101 PM EDT Thu Oct 31 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR CECIL...MONTGOMERY...NORTHWESTERN BUCKS AND CHESTER COUNTIES...
At 1101 PM EDT, severe thunderstorms were located along a line
extending from near Quakertown to West Nottingham, moving northeast
at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
West Chester, Elkton, Calvert, Norristown, Pottstown, Phoenixville,
Lansdale, West Norriton, East Norriton, Coatesville, Westtown,
Quakertown, Perkasie, Doylestown, Downingtown, Conshohocken,
Souderton, Bedminster, Ambler and Kennett Square.
This includes the following highways...
Interstate 95 in Maryland between mile markers 91 and 109.
Interstate 95 in Delaware near mile marker 0.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3976 7606 3987 7599 4011 7594 4023 7571
4037 7559 4058 7527 4061 7520 4057 7518
4057 7511 4042 7506 4041 7499 4003 7532
4006 7535 4006 7536 3984 7559 3972 7579
3952 7578 3955 7608 3972 7623
TIME...MOT...LOC 0301Z 214DEG 44KT 4047 7538 3966 7607
HAIL...<.75IN
WIND...60MPH
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 31, 8:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 64 min |
| Oct 31, 8:58 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 62 min |
| Oct 31, 9:35 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 55 min |
| Oct 31, 9:41 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Oct 31, 9:56 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 4 hr |
| Oct 31, 9:56 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Oct 31, 10:43 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 77 min |
| Oct 31, 10:45 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 4 hr |
| Oct 31, 11:08 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 4 hr |
| Oct 31, 11:14 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe, Northampton | 4 hr |
| Oct 31, 11:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 60 min |
| Oct 31, 11:32 PM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 14 min |
| Oct 31, 11:54 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 66 min |
| Oct 31, 11:54 PM EDT | Tornado Warning | PHI | Bucks | 36 min |
| Nov 1, 1:43 AM EDT | Areal Flood Warning | PHI | Berks | 4 hr |
| Nov 1, 2:28 AM EDT | River Flood Warning | PHI | Chester | 4 hr |
| Nov 1, 3:02 AM EDT | Areal Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 5 hr |
| Nov 1, 3:06 AM EDT | Areal Flood Warning | PHI | Carbon, Monroe, Northampton | 4 hr |
| Nov 1, 3:31 AM EDT | Freeze Watch | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 6 hr |
| Nov 1, 9:12 AM EDT | Freeze Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 25 hr |
| Nov 1, 3:16 PM EDT | Frost Advisory | PHI | Philadelphia | 19 hr |
| Oct 31, 10:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 73 min |
| Oct 31, 11:10 PM EDT | Tornado Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 35 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2019Severe Thunderstorm Warnings in Maryland, 2019Every severe thunderstorm warning in 2019
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.