Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 263, NWS Philadelphia/Mount Holly

July 22, 2019New Castle County, Delaware; Chester County, Delaware County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2019, 3:47 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Pennsylvania; Cecil County, Maryland. It was in force for 58 min. 3 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: Jul 22, 2019, 3:47 PM EDT (19:47 UTC)
Expired: Jul 22, 2019, 4:45 PM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 122 km from the middle of the area, began a volume at 19:50 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
Jul 22, 4:40 PM EDT	TSTM WND DMG	1 S West Chester, PA	TREE OR LIMB DOWN BLOCKING THE ROADWAY ON SPRUCE AVE AT JONES LN. TIME ESTIMATED FROM RADAR.
Jul 22, 4:43 PM EDT	TSTM WND DMG	1 Wsw Westtown, PA	TREE DOWN ON BAYWOOD RD AT TOWER COURSE DR. TIME ESTIMATED FROM RADAR.
Jul 22, 4:45 PM EDT	TSTM WND DMG	Calvert, MD	WIRES DOWN NEAR THE INTERSECTION OF MD-272 AND MD-273. 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
Jul 22, 2:17 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 156 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: 36 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1350 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

941 
WUUS51 KPHI 221947
SVRPHI
DEC003-MDC015-PAC029-045-222045-
/O.NEW.KPHI.SV.W.0263.190722T1947Z-190722T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
347 PM EDT Mon Jul 22 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 445 PM EDT.

* At 347 PM EDT, a severe thunderstorm was located near Wakefield, or
  14 miles southeast of Willow Street, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  West Chester, Calvert, Coatesville, Westtown, Downingtown, Kennett
  Square, Oxford, Parkesburg, West Grove, Rising Sun, Arden, Glen
  Roy, Blake, Cheyney, Talleyville, West Nottingham, Pughtown, Elam,
  Mount Vernon and Marshallton.

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.

&&

LAT...LON 3973 7610 3974 7610 3976 7606 3981 7603
      3983 7604 3983 7602 3985 7602 3987 7599
      3994 7598 3995 7600 4005 7593 4019 7566
      3982 7544 3963 7616 3972 7623
TIME...MOT...LOC 1947Z 248DEG 24KT 3981 7611 

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

Meola

2 follow-up statements

023 
WWUS51 KPHI 222019
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
419 PM EDT Mon Jul 22 2019

DEC003-MDC015-222029-
/O.CAN.KPHI.SV.W.0263.000000T0000Z-190722T2045Z/
New Castle DE-Cecil MD-
419 PM EDT Mon Jul 22 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE AND
NORTHWESTERN CECIL COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4003 7591 4011 7561 3987 7547 3977 7589
      3988 7593
TIME...MOT...LOC 2019Z 248DEG 24KT 3989 7585 

$$

PAC029-045-222045-
/O.CON.KPHI.SV.W.0263.000000T0000Z-190722T2045Z/
Chester PA-Delaware PA-
419 PM EDT Mon Jul 22 2019

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

At 419 PM EDT, a severe thunderstorm was located near Cochranville,
or 13 miles west of West Chester, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
West Chester, Coatesville, Westtown, Downingtown, Kennett Square,
Parkesburg, West Grove, Cochranville, Cheyney, Chester Springs,
Lionville, Elam, Marshallton, Concordville, Lionville-Marchwood, West
Goshen, South Coatesville, Avondale, Modena and Exton.

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.

&&

LAT...LON 4003 7591 4011 7561 3987 7547 3977 7589
      3988 7593
TIME...MOT...LOC 2019Z 248DEG 24KT 3989 7585 

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

Meola

510 
WWUS51 KPHI 222044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
444 PM EDT Mon Jul 22 2019

PAC029-045-222052-
/O.EXP.KPHI.SV.W.0263.000000T0000Z-190722T2045Z/
Chester PA-Delaware PA-
444 PM EDT Mon Jul 22 2019

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHESTER AND
SOUTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT 445 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Chester and Delaware Counties.

LAT...LON 4003 7591 4011 7561 3987 7547 3977 7589
      3988 7593
TIME...MOT...LOC 2042Z 250DEG 29KT 3984 7566 

$$

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 9:30 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	45 min
Jul 21, 9:44 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min
Jul 21, 10:13 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	47 min
Jul 21, 10:54 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	25 min
Jul 22, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Jul 22, 4:40 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	114 min
Jul 22, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	61 min
Jul 21, 8:25 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Northampton	50 min
Jul 21, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	46 min
Jul 21, 9:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Northampton	51 min
Jul 21, 9:58 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 21, 10:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	46 min
Jul 21, 10:30 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:31 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	40 min
Jul 21, 10:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	48 min
Jul 21, 10:58 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	59 min
Jul 21, 11:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	40 min
Jul 21, 11:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	44 min
Jul 21, 11:38 PM EDT	Flash Flood Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	2 hr
Jul 21, 11:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Montgomery, Northampton	50 min
Jul 22, 12:05 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	40 min
Jul 22, 12:45 AM EDT	Special Weather Statement	PHI	Monroe	30 min
Jul 22, 1:11 AM EDT	Special Weather Statement	PHI	Monroe	34 min
Jul 22, 5:32 AM EDT	Areal Flood Warning	PHI	Lehigh	49 min
Jul 22, 1:28 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 22, 1:50 PM EDT	Special Weather Statement	PHI	Northampton	25 min
Jul 22, 3:18 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jul 22, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	48 min
Jul 22, 3:33 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	7 hr
Jul 22, 3:39 PM EDT	Special Weather Statement	PHI	Berks	51 min
Jul 22, 4:11 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	50 min
Jul 22, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 22, 5:05 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jul 22, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	73 min
Jul 22, 5:34 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	80 min
Jul 22, 5:43 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 22, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	40 min
Jul 21, 9:55 PM EDT	Areal Flood Advisory	PHI	Cecil	87 min
Jul 22, 4:21 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent	2 hr

Nearby

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