Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 24, NWS Philadelphia/Mount Holly

April 26, 2019Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 26, 2019, 5:28 PM EDT for Montgomery County, Philadelphia County, Pennsylvania. It was in force for 47 min. 15 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: Apr 26, 2019, 5:28 PM EDT (21:28 UTC)
Expired: Apr 26, 2019, 6:15 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 21:31 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
Apr 26, 5:29 PM EDT	TSTM WND DMG	Penn Wynne, PA	DOWNED TREE AT INTERSECTION OF MANOA ROAD AND TRENT ROAD. TIME ESTIMATED FROM RADAR.
Apr 26, 5:30 PM EDT	TSTM WND DMG	1 S Bryn Mawr, PA	TRAIN STUCK DUE TO TREES AND WIRES DOWN ON THE SEPTA TRACKS NEAR BRYN MAWR. TIME ESTIMATED FROM RADAR.
Apr 26, 5:30 PM EDT	TSTM WND DMG	1 Sse Narberth, PA	DOWNED TREE BLOCKING THE ROADWAY NEAR THE INTERSECTION OF BOWMAN AVENUE AND KENMORE ROAD. TIME ESTIMATED FROM RADAR.
Apr 26, 5:31 PM EDT	TSTM WND DMG	1 Se Ardmore, PA	DOWNED TREE AT MIDFIELD ROAD AND LAKESIDE ROAD INTERSECTION, WITH ROADS BLOCKED. TIME ESTIMATED FROM RADAR.
Apr 26, 5:31 PM EDT	TSTM WND DMG	Belmont Hills, PA	SEVERAL TREES AND POWER LINES DOWN IN BALA CYNWYD. TIME ESTIMATED FROM RADAR.
Apr 26, 5:31 PM EDT	TSTM WND DMG	Narberth, PA	DOWNED TREE NEAR THE INTERSECTION OF FORREST AVENUE AND WINDSOR AVENUE. TIME ESTIMATED FROM RADAR.
Apr 26, 5:31 PM EDT	TSTM WND GST 62	Philadelphia Internatio, PA	PHL ITWS MEASURED A WIND GUST TO 54 KNOTS.
Apr 26, 5:31 PM EDT	TSTM WND GST 62	Philadelphia Internatio, PA	CORRECTS PREVIOUS TSTM WND GST REPORT FROM PHILADELPHIA INTERNATIONAL AIRPORT. PHL ITWS MEASURED A WIND GUST TO 54 KNOTS.
Apr 26, 5:32 PM EDT	TSTM WND GST 47	Philadelphia Internatio, PA
Apr 26, 5:33 PM EDT	TSTM WND DMG	Manayunk, PA	DOWNED TREES AT AND NEAR BOONE PARK. TIME ESTIMATED FROM RADAR.
Apr 26, 5:40 PM EDT	TSTM WND DMG	1 Ssw Elkins Park, PA	DOWNED TREE ON CHELTENHAM AVENUE NEAR THE BROAD STREET INTERSECTION. TIME ESTIMATED FROM RADAR.
Apr 26, 5:40 PM EDT	TSTM WND DMG	1 Sw Elkins Park, PA	DOWNED TREE DAMAGED A HOUSE IN WEST OAK LANE. TIME ESTIMATED FROM RADAR.
Apr 26, 5:42 PM EDT	TSTM WND DMG	1 S Elkins Park, PA	DOWNED TREES AND POWER LINES NEAR MELROSE PARK STATION. TIME ESTIMATED FROM RADAR.
Apr 26, 5:44 PM EDT	TSTM WND DMG	1 Nnw Philadelphia, PA	TREE UPROOTED AND BLOCKING THE ROADWAY NEAR THE INTERSECTION OF TWINING ROAD AND DALE ROAD. TIME ESTIMATED FROM RADAR.
Apr 26, 5:45 PM EDT	TSTM WND DMG	Rockledge, PA	DOWNED TREE NEAR THE INTERSECTION OF MONTGOMERY AVENUE AND CENTRAL AVENUE. 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
Apr 26, 1:33 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 221 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: 49 J/kg
Mixed-layer CIN: -221 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 355 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

818 
WUUS51 KPHI 262128
SVRPHI
PAC091-101-262215-
/O.NEW.KPHI.SV.W.0024.190426T2128Z-190426T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
528 PM EDT FRI APR 26 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 528 PM EDT, a severe thunderstorm was located over Morris Park,
  or near Philadelphia, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Philadelphia, Camden, Norristown, Lansdale, West Norriton, East
  Norriton, Yeadon, Conshohocken, Palmyra, Hatboro, Ambler,
  Jenkintown, Narberth, National Park, Rockledge, Abington, Bryn
  Athyn, Wissinoming, Morris Park and Bryn Mawr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.

LAT...LON 4026 7522 4012 7497 4008 7496 4002 7501
      3996 7513 3990 7513 3987 7521 3988 7526
      3994 7524 3997 7525 3997 7528 4007 7536
      4006 7539 4009 7542 4010 7546 4013 7546
      4014 7549
TIME...MOT...LOC 2128Z 245DEG 40KT 3999 7526 

HAIL...<.75IN
WIND...60MPH
 
$$

jjm

2 follow-up statements

819 
WWUS51 KPHI 262202
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
602 PM EDT FRI APR 26 2019

PAC091-262211-
/O.CAN.KPHI.SV.W.0024.000000T0000Z-190426T2215Z/
Montgomery PA-
602 PM EDT FRI APR 26 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4006 7498 4002 7501 4012 7504 4014 7501
      4012 7498 4012 7497 4008 7496
TIME...MOT...LOC 2201Z 245DEG 40KT 4015 7482 

$$

PAC101-262215-
/O.CON.KPHI.SV.W.0024.000000T0000Z-190426T2215Z/
Philadelphia PA-
602 PM EDT FRI APR 26 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN PHILADELPHIA COUNTY...

At 601 PM EDT, a severe thunderstorm was located over Tullytown, or
near Trenton, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Philadelphia, Northeast Philadelphia and Andalusia. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.

LAT...LON 4006 7498 4002 7501 4012 7504 4014 7501
      4012 7498 4012 7497 4008 7496
TIME...MOT...LOC 2201Z 245DEG 40KT 4015 7482 

HAIL...<.75IN
WIND...60MPH
 
$$

jjm

894 
WWUS51 KPHI 262211
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
611 PM EDT FRI APR 26 2019

PAC101-262220-
/O.EXP.KPHI.SV.W.0024.000000T0000Z-190426T2215Z/
Philadelphia PA-
611 PM EDT FRI APR 26 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PHILADELPHIA
COUNTY WILL EXPIRE AT 615 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.


LAT...LON 4006 7498 4002 7501 4012 7504 4014 7501
      4012 7498 4012 7497 4008 7496
TIME...MOT...LOC 2210Z 245DEG 40KT 4019 7470 

$$

jjm

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 11:45 AM EDT	Special Weather Statement	PHI	Philadelphia	45 min
Apr 26, 3:51 PM EDT	Special Weather Statement	PHI	Berks, Chester	69 min
Apr 26, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	56 min
Apr 26, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Chester	47 min
Apr 26, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	52 min
Apr 26, 4:59 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Delaware, Montgomery	4 hr
Apr 26, 5:07 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Philadelphia	53 min
Apr 26, 5:15 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Apr 26, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	43 min
Apr 26, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min
Apr 26, 5:57 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Apr 26, 6:34 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more	2 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every 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.