Alert archive / Pennsylvania / Tornado Warnings in 2019

Tornado Warning 13, NWS Philadelphia/Mount Holly

May 28, 2019Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at May 28, 2019, 6:09 PM EDT for Chester County, Pennsylvania. It was in force for 36 min. 10 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: May 28, 2019, 6:09 PM EDT (22:09 UTC)
Expired: May 28, 2019, 6:45 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 22:10 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
May 28, 6:25 PM EDT	TSTM WND DMG	1 Nnw West Chester, PA	TREE DOWN AT OWEN ROAD AND KIRBY DRIVE IN WEST GOSHEN TWP. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.
May 28, 6:28 PM EDT	TSTM WND DMG	1 Wnw Downington, PA	DOWNED TREE BLOCKING THE SOUTHBOUND LANE OF ROCK RAYMOND DRIVE NEAR THE U.S. 30 BYPASS. TIME ESTIMATED FROM RADAR.
May 28, 6:28 PM EDT	HAIL 1	1 N West Chester, PA
May 28, 6:30 PM EDT	HAIL 1	Exton, PA
May 28, 6:33 PM EDT	TSTM WND DMG	1 Nne South Coatesville, PA	LARGE TREE BLOWN DOWN NEAR THE INTERSECTION OF FOUNDRY ROAD AND FOUNDRY STREET IN CALN TWP. TIME ESTIMATED FROM RADAR.
May 28, 6:35 PM EDT	TSTM WND DMG	1 Se Exton, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 SE EXTON. TREE DOWN ON PA-100.
May 28, 6:35 PM EDT	TSTM WND DMG	1 Se Exton, PA	TREE DOWN ON PA-100.
May 28, 6:38 PM EDT	TSTM WND DMG	1 W East Goshen Twp., PA	TREE DOWN BLOCKING MEADOWBROOK LANE NEAR BOOT ROAD. TIME ESTIMATED FROM RADAR.
May 28, 6:44 PM EDT	HAIL 0.7	1 Nne West Goshen, PA
May 28, 6:49 PM EDT	TSTM WND DMG	1 Ssw East Goshen Twp., PA	TREE DOWN BLOCKING BARKER DRIVE AT MARYDELL DRIVE. 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
May 28, 1:48 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 187 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: 35 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

153 
WFUS51 KPHI 282209
TORPHI
PAC029-282245-
/O.NEW.KPHI.TO.W.0013.190528T2209Z-190528T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
609 PM EDT Tue May 28 2019

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Central Chester County in southeastern Pennsylvania...

* Until 645 PM EDT.
    
* At 608 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Coatesville, or 13 miles east of New Holland,
  moving east at 30 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  West Chester, Coatesville, Downingtown, Glenmoore, Chester Springs,
  Lionville, Marshallton, Lionville-Marchwood, Paoli, West Goshen,
  Malvern, South Coatesville, Modena, Exton and Thorndale.

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.

&&

LAT...LON 4015 7586 4015 7585 4009 7548 3986 7561
      4001 7593
TIME...MOT...LOC 2208Z 292DEG 28KT 4004 7585 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gorse

3 follow-up statements

795 
WWUS51 KPHI 282219
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
619 PM EDT Tue May 28 2019

PAC029-282245-
/O.CON.KPHI.TO.W.0013.000000T0000Z-190528T2245Z/
Chester PA-
619 PM EDT Tue May 28 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR CENTRAL
CHESTER COUNTY...
    
At 618 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Downingtown, or 9 miles northwest of West Chester,
moving east at 30 mph.

HAZARD...Tornado and quarter size hail.

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...
West Chester, Coatesville, Downingtown, Glenmoore, Lionville,
Marshallton, Lionville-Marchwood, Paoli, West Goshen, Malvern, South
Coatesville, Exton and Thorndale.

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.

&&

LAT...LON 4009 7548 3986 7561 3999 7583 4009 7579
TIME...MOT...LOC 2218Z 291DEG 28KT 4002 7576 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gorse

039 
WWUS51 KPHI 282232
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
632 PM EDT Tue May 28 2019

PAC029-282245-
/O.CON.KPHI.TO.W.0013.000000T0000Z-190528T2245Z/
Chester PA-
632 PM EDT Tue May 28 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR EAST
CENTRAL CHESTER COUNTY...
    
At 632 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Marshallton, or near West Chester, moving east at 40
mph.

HAZARD...Tornado and quarter size hail.

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...
West Chester, Downingtown, Lionville, Marshallton,
Lionville-Marchwood, Paoli, West Goshen, Malvern, Exton and
Thorndale.

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.

&&

LAT...LON 4006 7550 4001 7552 3990 7559 3995 7576
      4005 7571
TIME...MOT...LOC 2232Z 285DEG 33KT 3997 7567 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gorse

936 
WWUS51 KPHI 282239
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
639 PM EDT Tue May 28 2019

PAC029-282247-
/O.EXP.KPHI.TO.W.0013.000000T0000Z-190528T2245Z/
Chester PA-
639 PM EDT Tue May 28 2019

...THE TORNADO WARNING FOR EAST CENTRAL CHESTER COUNTY WILL EXPIRE AT
645 PM EDT...
                
The rotation has weakened and therefore the warning will be allowed 
to expire.

A tornado watch remains in effect until 1000 PM EDT for southeastern
Pennsylvania.

Remember, a Severe Thunderstorm Warning still remains in effect for
Chester County.

LAT...LON 4006 7550 4001 7552 3990 7559 3995 7576
      4005 7571
TIME...MOT...LOC 2237Z 292DEG 28KT 3996 7563 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
May 28, 4:56 PM EDT	Special Weather Statement	PHI	Chester	49 min
May 28, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	67 min
May 28, 5:22 PM EDT	Tornado Warning	PHI	Berks	23 min
May 28, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
May 28, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	45 min
May 28, 6:03 PM EDT	Areal Flood Advisory	PHI	Berks	2 hr
May 28, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Chester	64 min
May 28, 6:14 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
May 28, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	44 min
May 28, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	48 min
May 28, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
May 28, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	38 min
May 28, 7:00 PM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
May 28, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	63 min
May 28, 7:59 PM EDT	Areal Flood Advisory	PHI	Monroe	2 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.