Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 160, NWS Philadelphia/Mount Holly

June 29, 2019Chester County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 29, 2019, 3:27 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 53 min. 7 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: Jun 29, 2019, 3:27 PM EDT (19:27 UTC)
Expired: Jun 29, 2019, 4:20 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

Counties Cecil County, MD, Chester County, PA

The radar

The Dover AFB radar (KDOX), 116 km from the middle of the area, began a volume at 19:30 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
Jun 29, 3:31 PM EDT	TSTM WND DMG	1 Sse Atglen, PA	DOWNED TREES AND POWER LINES ON AND NEAR FALLOWFIELD ROAD. TIME ESTIMATED FROM RADAR.
Jun 29, 3:37 PM EDT	TSTM WND DMG	1 Se Atglen, PA	DOWNED TREE ON GAP NEWPORT PIKE NEAR GLEN RUN ROAD. TIME ESTIMATED FROM RADAR.
Jun 29, 3:41 PM EDT	TSTM WND DMG	2 S Parkesburg, PA	DOWNED TREE BLOCKING LIMESTONE ROAD NEAR HIGHLAND ROAD. TIME ESTIMATED FROM RADAR.
Jun 29, 3:51 PM EDT	TSTM WND DMG	2 Wnw Conowingo, MD	THUNDERSTORM OUTFLOW RESULTED IN A DOWNED TREE AND WIRES ON CONOWINGO ROAD. TIME ESTIMATED FROM RADAR.
Jun 29, 4:02 PM EDT	TSTM WND DMG	1 Nw Pleasant Hill, MD	SOCIAL MEDIA PHOTO OF LARGE TREE BLOWN DOWN ACROSS BLUE BALL ROAD NEAR WHEATLEY ROAD. MORE TREES REPORTED DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 29, 4:05 PM EDT	TSTM WND DMG	Landenberg, PA	TREES DOWN. TIME ESTIMATED FROM RADAR.
Jun 29, 4:08 PM EDT	TSTM WND DMG	1 Ssw Kennett Square, PA	DOWNED TREE NEAR THE INTERSECTION OF ORIOLE DRIVE AND CHANDLER MILL ROAD. 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
Jun 29, 12:08 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.5 hours before the alert went out and 152 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: 927 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

915 
WUUS51 KPHI 291927
SVRPHI
MDC015-PAC029-292045-
/O.NEW.KPHI.SV.W.0160.190629T1927Z-190629T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
327 PM EDT Sat Jun 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Cecil County in northeastern Maryland...
  Southwestern Chester County in southeastern Pennsylvania...

* Until 445 PM EDT.

* At 326 PM EDT, severe thunderstorms were located along a line
  extending from near Gap to near Safe Harbor to near Stewartstown,
  moving east at 25 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Havre De Grace, Calvert, Kennett Square, Oxford, Parkesburg, North
  East, West Grove, Rising Sun, Homeville, Glen Roy, Zion, Blake,
  Cochranville, West Nottingham, Octoraro, Mount Vernon, Fair Hill,
  Glen Westover, Bay View and Lombard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare for large hail and damaging winds. People outside should 
move to shelter inside a strong building when threatening weather 
approaches. Stay away from windows.

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3972 7614 3974 7612 3973 7610 3974 7610
      3976 7606 3983 7604 3987 7599 3995 7600
      3997 7598 3987 7565 3981 7568 3972 7579
      3968 7579 3956 7609 3972 7623
TIME...MOT...LOC 1926Z 282DEG 22KT 3993 7603 3993 7635 3976 7651 

HAIL...1.75IN
WIND...70MPH
 
$$

CMS

2 follow-up statements

548 
WWUS51 KPHI 292004
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
404 PM EDT Sat Jun 29 2019

MDC015-PAC029-292045-
/O.CON.KPHI.SV.W.0160.000000T0000Z-190629T2045Z/
Cecil MD-Chester PA-
404 PM EDT Sat Jun 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHERN CECIL AND SOUTHWESTERN CHESTER COUNTIES...

At 403 PM EDT, severe thunderstorms were located along a line
extending from near Kennett Square to near Homeville to near Rock
Springs, moving east at 25 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Public. Numerous reports of large hail and wind damage have 
         been received from Chester County.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Havre De Grace, Calvert, Kennett Square, Oxford, North East, West
Grove, Rising Sun, Homeville, Glen Roy, Zion, Blake, Cochranville,
West Nottingham, Octoraro, Mount Vernon, Fair Hill, Glen Westover,
Bay View, Lombard and Richardsmere.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Chester County. SEEK SHELTER NOW inside a sturdy 
structure and stay away from windows.
 
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3972 7614 3974 7612 3973 7610 3974 7610
      3976 7606 3983 7604 3987 7599 3994 7587
      3987 7565 3981 7568 3972 7579 3968 7579
      3956 7609 3972 7623
TIME...MOT...LOC 2003Z 282DEG 22KT 3988 7575 3988 7607 3971 7623 

HAIL...1.50IN
WIND...70MPH
 
$$

CMS

418 
WWUS51 KPHI 292020 RRA
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
420 PM EDT Sat Jun 29 2019

MDC015-PAC029-292030-
/O.CAN.KPHI.SV.W.0160.000000T0000Z-190629T2045Z/
Cecil MD-Chester PA-
420 PM EDT Sat Jun 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CECIL AND
SOUTHWESTERN CHESTER COUNTIES IS CANCELLED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 700 PM EDT for
northern Delaware...northeastern Maryland...and southeastern
Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

Remember, a Severe Thunderstorm Warning still remains in effect for
eastern Cecil County until 445 PM.

LAT...LON 3972 7614 3974 7612 3973 7610 3974 7610
      3976 7606 3983 7604 3987 7599 3994 7587
      3987 7565 3981 7568 3972 7579 3968 7579
      3956 7609 3972 7623
TIME...MOT...LOC 2017Z 282DEG 22KT 3986 7564 3986 7596 3969 7612 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 2:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
Jun 29, 2:46 PM EDT	Special Weather Statement	PHI	Chester	29 min
Jun 29, 3:06 PM EDT	Special Weather Statement	PHI	Chester	24 min
Jun 29, 3:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jun 29, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	55 min
Jun 29, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	36 min
Jun 29, 3:45 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Jun 29, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	53 min
Jun 29, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	49 min
Jun 29, 3:59 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	46 min
Jun 29, 4:00 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	3 hr
Jun 29, 4:17 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	3 hr
Jun 29, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	47 min
Jun 29, 4:41 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	3 hr
Jun 29, 7:10 PM EDT	Special Weather Statement	PHI	Berks	35 min
Jun 29, 7:16 PM EDT	Special Weather Statement	PHI	Lebanon	29 min
Jun 29, 1:19 PM EDT	Special Weather Statement	PHI	Cecil	26 min
Jun 29, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	49 min
Jun 29, 2:08 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jun 29, 2:12 PM EDT	Special Weather Statement	PHI	Cecil	33 min
Jun 29, 2:44 PM EDT	Special Weather Statement	PHI	Cecil	31 min
Jun 29, 2:47 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	28 min
Jun 29, 3:39 PM EDT	Special Weather Statement	PHI	Cecil	51 min
Jun 29, 4:14 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	46 min
Jun 29, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	52 min
Jun 29, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	50 min
Jun 29, 4:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's, Talbot	47 min
Jun 29, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	79 min
Jun 29, 5:38 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's	109 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in Maryland, 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.