Alert archive / Pennsylvania / Tornado Warnings in 2019

Tornado Warning 11, NWS Philadelphia/Mount Holly

May 23, 2019Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at May 23, 2019, 11:01 PM EDT for Chester County, Pennsylvania. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 23, 2019, 11:01 PM EDT (03:01 UTC)
Expired: May 23, 2019, 11:30 PM EDT
In force: 29 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), 124 km from the middle of the area, began a volume at 03:04 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.0 hours before the alert went out and 179 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: 225 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 1497 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

061 
WFUS51 KPHI 240301
TORPHI
PAC029-240330-
/O.NEW.KPHI.TO.W.0011.190524T0301Z-190524T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1101 PM EDT Thu May 23 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1130 PM EDT.
    
* At 1100 PM EDT, a severe thunderstorm capable of producing a
  tornado was located over Churchtown, or near New Holland, moving
  southeast 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...
  Coatesville, Downingtown, Honey Brook, Lionville, Marshallton,
  Glenmoore, Lionville-Marchwood, 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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4004 7593 4008 7593 4011 7594 4013 7589
      4004 7559 3986 7577 4001 7595
TIME...MOT...LOC 0300Z 302DEG 36KT 4013 7601 

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

$$

Robertson

2 follow-up statements

458 
WWUS51 KPHI 240318
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1118 PM EDT Thu May 23 2019

PAC029-240330-
/O.CON.KPHI.TO.W.0011.000000T0000Z-190524T0330Z/
Chester PA-
1118 PM EDT Thu May 23 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR CENTRAL
CHESTER COUNTY...
    
At 1118 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Glenmoore, or 11 miles northwest of West Chester,
moving east at 35 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...
Coatesville, Downingtown, Lionville, Marshallton, Glenmoore,
Lionville-Marchwood, 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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3998 7591 4012 7584 4004 7559 3989 7574
      3995 7588
TIME...MOT...LOC 0318Z 292DEG 31KT 4004 7579 

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

$$

MPS

281 
WWUS51 KPHI 240328
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1128 PM EDT Thu May 23 2019

PAC029-240337-
/O.EXP.KPHI.TO.W.0011.000000T0000Z-190524T0330Z/
Chester PA-
1128 PM EDT Thu May 23 2019

...THE TORNADO WARNING FOR CENTRAL CHESTER COUNTY WILL EXPIRE AT 1130
PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

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

LAT...LON 3998 7591 4012 7584 4004 7559 3989 7574
      3995 7588
TIME...MOT...LOC 0327Z 302DEG 36KT 3999 7569 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 9:28 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	32 min
May 23, 9:37 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	23 min
May 23, 9:50 PM EDT	Tornado Warning	PHI	Carbon, Monroe	25 min
May 23, 9:59 PM EDT	Tornado Warning	PHI	Monroe, Northampton	31 min
May 23, 10:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	43 min
May 23, 11:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	38 min
May 23, 11:37 PM EDT	Special Weather Statement	PHI	Berks	38 min
May 24, 12:15 AM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	30 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.