Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 128, NWS Philadelphia/Mount Holly

June 16, 2019Chester County, Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 16, 2019, 5:39 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 36 min. 2 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 16, 2019, 5:39 PM EDT (21:39 UTC)
Expired: Jun 16, 2019, 6:15 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties New Castle County, DE, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 127 km from the middle of the area, began a volume at 21:40 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 16, 5:40 PM EDT	TSTM WND DMG	Sadsburyville, PA	DOWNED TREE BLOCKING U.S. 30 BYPASS EASTBOUND. TIME ESTIMATED FROM RADAR.
Jun 16, 5:45 PM EDT	TSTM WND DMG	2 Ese East Brandywine T, PA	TREE BROUGHT DOWN WIRES WHICH BLOCKED INTERSECTION OF BUCK RD/ SUMMERHILL DR. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.7 hours before the alert went out and 167 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: 1524 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

671 
WUUS51 KPHI 162139
SVRPHI
DEC003-PAC029-045-162215-
/O.NEW.KPHI.SV.W.0128.190616T2139Z-190616T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
539 PM EDT Sun Jun 16 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern New Castle County in northern Delaware...
  Southern Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 539 PM EDT, a severe thunderstorm was located over Cochranville,
  or 16 miles west of West Chester, moving east 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...
  Wilmington, Newark, West Chester, Coatesville, Westtown,
  Downingtown, Elsmere, Kennett Square, Parkesburg, West Grove,
  Newport, Homeville, Cochranville, Stanton, Cheyney, North Star,
  Talleyville, Elam, Marshallton and Pike Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 3986 7601 3987 7599 3992 7600 3994 7598
      3995 7600 4004 7593 4007 7593 4000 7541
      3965 7565 3983 7602
TIME...MOT...LOC 2139Z 286DEG 38KT 3991 7590 

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

MPS

2 follow-up statements

159 
WWUS51 KPHI 162156
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
556 PM EDT Sun Jun 16 2019

DEC003-PAC029-045-162215-
/O.CON.KPHI.SV.W.0128.000000T0000Z-190616T2215Z/
New Castle DE-Chester PA-Delaware PA-
556 PM EDT Sun Jun 16 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHWESTERN NEW CASTLE...SOUTH CENTRAL CHESTER AND SOUTHWESTERN
DELAWARE COUNTIES...

At 556 PM EDT, a severe thunderstorm was located over Kennett Square,
or 10 miles southwest of West Chester, moving southeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Wilmington, Elsmere, Kennett Square, West Grove, Newport, Greenville,
Stanton, North Star, Talleyville, Elam, Ladenberg, Pike Creek,
Concordville, Hockessin, Ashland, Avondale and Toughkenamon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 3979 7586 3995 7577 3988 7549 3968 7563
TIME...MOT...LOC 2156Z 293DEG 32KT 3984 7573 

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

MPS

757 
WWUS51 KPHI 162210
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
610 PM EDT Sun Jun 16 2019

DEC003-PAC029-045-162219-
/O.EXP.KPHI.SV.W.0128.000000T0000Z-190616T2215Z/
New Castle DE-Chester PA-Delaware PA-
610 PM EDT Sun Jun 16 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE...
SOUTH CENTRAL CHESTER AND SOUTHWESTERN DELAWARE COUNTIES WILL EXPIRE
AT 615 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

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 3979 7586 3995 7577 3988 7549 3968 7563
TIME...MOT...LOC 2209Z 286DEG 29KT 3981 7563 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 5:55 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	2 hr

Nearby

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