Alert archive / Pennsylvania / Tornado Warnings in 2018

Tornado Warning 9, NWS Philadelphia/Mount Holly

November 2, 20185 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Nov 2, 2018, 11:23 PM EDT for 5 counties in Pennsylvania. It was in force for 24 min. 1 report 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: Nov 2, 2018, 11:23 PM EDT (03:23 UTC)
Expired: Nov 2, 2018, 11:47 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 68 km from the middle of the area, began a volume at 03:25 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
Nov 2, 11:49 PM EDT	TSTM WND DMG	1 Nne Whitemarsh Twp, PA	DOWNED TREE IN WIRES ON STENTON AVENUE AND PENLLYN BLUE BELL PIKE BETWEEN JOSHUA ROAD AND MILITIA HILL ROAD. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.

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, 3.4 hours before the alert went out and 206 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 141 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 497 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

617 
WFUS51 KPHI 030323
TORPHI
PAC017-029-045-091-101-030415-
/O.NEW.KPHI.TO.W.0009.181103T0323Z-181103T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1123 PM EDT FRI NOV 2 2018

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  East central Chester County in southeastern Pennsylvania...
  Northern Philadelphia County in southeastern Pennsylvania...
  Northern Delaware County in southeastern Pennsylvania...

* Until 1215 AM EDT.
    
* At 1122 PM EDT, a severe thunderstorm capable of producing a
  tornado was located over West Norriton, or 15 miles northwest of
  Philadelphia, moving east at 40 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.

* This dangerous storm will be near...
  Chestnut Hill around 1130 PM EDT.
  Lansdale and Ambler around 1135 PM EDT.
  Jenkintown, Chalfont and Abington around 1140 PM EDT.
  Hatboro, Bryn Athyn and Willow Grove around 1145 PM EDT.
  Philadelphia, Ivyland and Feasterville around 1150 PM EDT.
  Langhorne, Richboro and Feasterville-Trevose around 1155 PM EDT.
  New Hope, Newtown and Langhorn around 1200 AM EDT.
  Levittown around 1205 AM EDT.

Other locations impacted by this tornadic thunderstorm include
Churchville, Hulmeville, Horsham, Evansburg, Fort Washington,
Bridgeport, Blue Bell, Maple Glen, Eagleville and Flourtown.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4002 7543 4019 7550 4038 7495 4033 7494
      4033 7492 4013 7483
TIME...MOT...LOC 0322Z 251DEG 36KT 4014 7538 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SFJ

2 follow-up statements

056 
WWUS51 KPHI 030334
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1134 PM EDT FRI NOV 2 2018

PAC029-045-101-030343-
/O.CAN.KPHI.TO.W.0009.000000T0000Z-181103T0415Z/
Chester PA-Philadelphia PA-Delaware PA-
1134 PM EDT FRI NOV 2 2018

...THE TORNADO WARNING FOR EAST CENTRAL CHESTER...NORTHERN
PHILADELPHIA AND NORTHERN DELAWARE COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the tornado warning has been 
cancelled. However, a severe thunderstorm warning remains in effect.

LAT...LON 4009 7532 4023 7540 4038 7495 4033 7494
      4033 7492 4017 7485
TIME...MOT...LOC 0333Z 248DEG 34KT 4017 7530 

$$

PAC017-091-030415-
/O.CON.KPHI.TO.W.0009.000000T0000Z-181103T0415Z/
Montgomery PA-Bucks PA-
1134 PM EDT FRI NOV 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR EAST
CENTRAL MONTGOMERY AND SOUTHEASTERN BUCKS COUNTIES...
    
At 1133 PM EDT, a severe thunderstorm capable of producing a tornado
was located over East Norriton, or 14 miles northwest of
Philadelphia, moving east at 40 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.

This dangerous storm will be near...
  Chalfont and Willow Grove around 1145 PM EDT.
  Doylestown, Hatboro, Bryn Athyn and Ivyland around 1150 PM EDT.
  Feasterville-Trevose and Feasterville around 1155 PM EDT.
  Langhorne, Richboro and Langhorn around 1200 AM EDT.
  New Hope and Newtown around 1205 AM EDT.

Other locations impacted by this tornadic thunderstorm include
Churchville, Horsham, Warminster Heights, Woodbourne, Fort
Washington, Blue Bell, Maple Glen, Village Shires, Brittany
Farms-Highlands and New Britain.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4009 7532 4023 7540 4038 7495 4033 7494
      4033 7492 4017 7485
TIME...MOT...LOC 0333Z 248DEG 34KT 4017 7530 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SFJ

485 
WWUS51 KPHI 030347
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1147 PM EDT FRI NOV 2 2018

PAC017-091-030356-
/O.CAN.KPHI.TO.W.0009.000000T0000Z-181103T0415Z/
Montgomery PA-Bucks PA-
1147 PM EDT FRI NOV 2 2018

...THE TORNADO WARNING FOR EAST CENTRAL MONTGOMERY AND SOUTHEASTERN
BUCKS COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

Remember, a Severe Thunderstorm Warning still remains in effect for
much of this area.

LAT...LON 4009 7532 4023 7540 4038 7495 4033 7494
      4033 7492 4017 7485
TIME...MOT...LOC 0345Z 251DEG 36KT 4021 7513 

$$

SFJ

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 2, 8:22 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	4 hr
Nov 2, 9:28 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Nov 2, 9:48 PM EDT	Special Weather Statement	PHI	Berks, Chester	27 min
Nov 2, 10:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	51 min
Nov 2, 10:32 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Nov 2, 10:36 PM EDT	Special Weather Statement	PHI	Northampton	24 min
Nov 2, 10:45 PM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	13 hr
Nov 2, 10:47 PM EDT	Tornado Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	43 min
Nov 2, 10:53 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Nov 2, 10:53 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	67 min
Nov 2, 11:25 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Nov 2, 11:49 PM EDT	Tornado Warning	PHI	Bucks	26 min
Nov 2, 11:53 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Nov 2, 11:53 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	37 min
Nov 3, 12:20 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Nov 3, 1:03 AM EDT	River Flood Warning	PHI	Lehigh	5 hr
Nov 3, 1:29 AM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr
Nov 3, 1:41 AM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Nov 3, 2:03 AM EDT	River Flood Warning	PHI	Chester	6 hr
Nov 3, 2:34 AM EDT	Areal Flood Warning	PHI	Bucks, Northampton	15 hr
Nov 3, 2:40 AM EDT	River Flood Warning	PHI	Montgomery	10 hr
Nov 3, 2:40 AM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	15 hr
Nov 3, 3:21 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Nov 3, 5:00 AM EDT	River Flood Warning	PHI	Chester, Delaware	6 hr
Nov 3, 7:01 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Nov 3, 11:44 AM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	8 hr
Nov 3, 5:19 PM EDT	Areal Flood Warning	PHI	Northampton	22 hr

Nearby

Tornado Warnings in Pennsylvania, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.