Alert archive / Pennsylvania / Tornado Warnings in 2019

Tornado Warning 31, NWS Philadelphia/Mount Holly

October 31, 20194 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Oct 31, 2019, 11:32 PM EDT for 4 counties in Pennsylvania. It was in force for 14 min. 12 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, 11:32 PM EDT (03:32 UTC)
Expired: Oct 31, 2019, 11:46 PM EDT
In force: 14 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

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

The radar

The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 03:32 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, 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, 11:32 PM EDT	TSTM WND DMG	1 Se Newtown Square, PA	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Oct 31, 11:34 PM EDT	TSTM WND DMG	1 N Springfield, PA	LARGE HARDWOOD TREE FELLED ONTO A PARKED MINIVAN. 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, 11:34 PM EDT	TSTM WND DMG	1 Se Villanova, PA	SEVERAL LARGE TREE LIMBS DOWN, DAMAGING A HOME. TIME ESTIMATED FROM RADAR.
Oct 31, 11:34 PM EDT	TSTM WND DMG	Broomall, PA	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN. 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.
Oct 31, 11:42 PM EDT	TSTM WND DMG	1 Nnw Chestnut Hill, PA	DOWNED UTILITY NEAR THE INTERSECTION OF STENTON AVENUE AND HILLCREST AVENUE. TIME ESTIMATED FROM RADAR.
Oct 31, 11:42 PM EDT	TSTM WND DMG	Ambler, PA	* 1 INJ * A HOUSE COLLAPSE OCCURRED AS A RESULT OF STRONG WIND GUSTS. ONE INJURY WAS REPORTED. TIME ESTIMATED FROM RADAR.
Oct 31, 11:42 PM EDT	TSTM WND DMG	Flourtown, PA	DOWNED TREES REPORTED. TIME ESTIMATED FROM RADAR.
Oct 31, 11:44 PM EDT	TSTM WND DMG	Upper Dublin Twp, PA	DOWNED TREE ON STATE HIGHWAY 309 NEAR LINCOLN DRIVE. TIME ESTIMATED FROM RADAR.
Oct 31, 11:47 PM EDT	TSTM WND DMG	Hatboro, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM HATBORO. SEVERAL REPORTS OF TREES AND POWER LINES DOWN AS WELL AS DAMAGE TO RESIDENTIAL FENCES, SHINGLES, AND SIDING IN HATBORO, HORSHAM, AND WILLOW GROVE. 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

Brookhaven, NY (KOKX), launched 00:00Z, 3.5 hours before the alert went out and 214 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 491 m²/s²
0-3 km storm-relative helicity: 510 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

769 
WFUS51 KPHI 010332
TORPHI
PAC029-045-091-101-010400-
/O.NEW.KPHI.TO.W.0031.191101T0332Z-191101T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1132 PM EDT Thu Oct 31 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until midnight EDT.
    
* At 1132 PM EDT, a severe thunderstorm capable of producing a
  tornado was located over Gradyville, or 9 miles east of West
  Chester, moving northeast at 50 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...
  Philadelphia, Conshohocken, Palmyra, Hatboro, Ambler, Jenkintown,
  Narberth, Rockledge, Abington, Bryn Athyn, Wissinoming, Willow
  Grove, Morris Park, Germantown, Northeast Philadelphia, Center
  City, Bryn Mawr, Trout Lake, Tacony and Radnor Township.

This includes Interstate 95 in Pennsylvania between mile markers 26
and 33.
 
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 7516 4017 7507 4005 7497 4002 7501
      4002 7504 3999 7506 3992 7545 3998 7551
TIME...MOT...LOC 0332Z 240DEG 44KT 3996 7543 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Robertson

1 follow-up statement

714 
WWUS51 KPHI 010346
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1146 PM EDT Thu Oct 31 2019

PAC029-045-091-101-010354-
/O.CAN.KPHI.TO.W.0031.000000T0000Z-191101T0400Z/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
1146 PM EDT Thu Oct 31 2019

...THE TORNADO WARNING FOR SOUTHEASTERN MONTGOMERY...EAST CENTRAL
CHESTER...PHILADELPHIA AND NORTHEASTERN DELAWARE 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.

A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
southern New Jersey...and southeastern Pennsylvania.

LAT...LON 4022 7516 4017 7507 4005 7497 4002 7501
      4002 7504 3999 7506 3992 7545 3998 7551
TIME...MOT...LOC 0342Z 240DEG 44KT 4004 7525 

$$

Robertson

The 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, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	67 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, 11:54 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

Nearby

Tornado Warnings in Pennsylvania, 2019 Every tornado warning in 2019 Tornadoes 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.