Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 99, NWS Philadelphia/Mount Holly

May 29, 20194 counties in Pennsylvania; New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2019, 6:22 PM EDT for 4 counties in Pennsylvania; New Castle County, Delaware; Cecil County, Maryland. It was in force for 53 min. 8 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 29, 2019, 6:22 PM EDT (22:22 UTC)
Expired: May 29, 2019, 7:15 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 104 km from the middle of the area, began a volume at 22:09 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 29, 6:24 PM EDT	TSTM WND DMG	1 Ese Malvern, PA	DOWNED UTILITY ON PAOLI PIKE NEAR GRUBB ROAD. TIME ESTIMATED FROM RADAR.
May 29, 6:35 PM EDT	TSTM WND DMG	1 Ene Berwyn, PA	TREE DOWN.
May 29, 6:37 PM EDT	TSTM WND DMG	1 Nnw Woodlawn, MD	DOWNED TREES AND WIRES AND WIND-BLOWN DEBRIS CLOSED COLORA ROAD NEAR FIRETOWER ROAD. TIME ESTIMATED FROM RADAR.
May 29, 6:45 PM EDT	TSTM WND DMG	1 Wsw Hyde Park, DE	SEVERAL LARGE TREES DOWN IN THE SHERWOOD II DEVELOPMENT. TIME ESTIMATED FROM RADAR.
May 29, 6:49 PM EDT	TSTM WND DMG	1 Ene Havre De Grace, MD	ROOF BLOWN OFF OF HOUSE ON THE 200 BLOCK OF N WASHINGTON STREET.
May 29, 6:55 PM EDT	TSTM WND DMG	Hyde Park, DE	TREES REPORTED DOWN IN BRANDYWINE SPRINGS. TIME ESTIMATED FROM RADAR.
May 29, 6:57 PM EDT	TSTM WND GST 58	New Castle County Airpo, DE
May 29, 7:06 PM EDT	MARINE TSTM WIND 41	1 Nne Delaware City, DE

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 29, 1:10 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.4 hours before the alert went out and 170 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: 292 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

765 
WUUS51 KPHI 292222
SVRPHI
DEC003-MDC015-PAC029-045-091-101-292315-
/O.NEW.KPHI.SV.W.0099.190529T2222Z-190529T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
622 PM EDT Wed May 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Cecil County in northeastern Maryland...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 715 PM EDT.

* At 621 PM EDT, severe thunderstorms were located along a line
  extending from Strasburg to near Bel Air North, moving east at 60
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Philadelphia, Wilmington, Newark, West Chester, Elkton, Calvert, 
  Chester, Coatesville, Yeadon, Westtown, Downingtown, Conshohocken, 
  Folcroft, Swarthmore, Elsmere, Kennett Square and New Castle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 PM EDT for northern
Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

&&

LAT...LON 3973 7610 3976 7606 3987 7599 4009 7594
      4008 7497 3996 7513 3988 7515 3984 7536
      3971 7548 3972 7552 3964 7559 3961 7556
      3964 7560 3962 7561 3955 7557 3951 7599
      3955 7602 3955 7609 3972 7623
TIME...MOT...LOC 2221Z 270DEG 50KT 3996 7616 3963 7638 

HAIL...1.00IN
WIND...60MPH
 
$$

Iovino

1 follow-up statement

258 
WWUS51 KPHI 292309
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
709 PM EDT Wed May 29 2019

DEC003-MDC015-PAC029-045-091-101-292318-
/O.EXP.KPHI.SV.W.0099.000000T0000Z-190529T2315Z/
New Castle DE-Cecil MD-Montgomery PA-Chester PA-Philadelphia PA-
Delaware PA-
709 PM EDT Wed May 29 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...CECIL...
SOUTHEASTERN MONTGOMERY...CHESTER...PHILADELPHIA AND DELAWARE
COUNTIES WILL EXPIRE AT 715 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A tornado watch remains in effect until 800 PM EDT for northern
Delaware...northeastern Maryland...southern New Jersey...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.

LAT...LON 3973 7610 3976 7606 3987 7599 4009 7594
      4008 7497 3996 7513 3988 7515 3984 7536
      3971 7548 3972 7552 3964 7559 3961 7556
      3964 7560 3962 7561 3955 7557 3951 7599
      3955 7602 3955 7609 3972 7623
TIME...MOT...LOC 2308Z 270DEG 50KT 3996 7616 3963 7638 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:23 PM EDT	Tornado Warning	PHI	Monroe	37 min
May 28, 9:17 PM EDT	River Flood Warning	PHI	Chester	101 min
May 29, 3:18 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	18 hr
May 29, 2:19 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
May 29, 2:26 PM EDT	Special Weather Statement	PHI	Montgomery	34 min
May 29, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	60 min
May 29, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	27 min
May 29, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
May 29, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	65 min
May 29, 3:17 PM EDT	Tornado Warning	PHI	Bucks, Lehigh	28 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	46 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	46 min
May 29, 3:38 PM EDT	Tornado Warning	PHI	Bucks	37 min
May 29, 3:43 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	4 hr
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	62 min
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	47 min
May 29, 4:04 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
May 29, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	51 min
May 29, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	47 min
May 29, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	27 min
May 29, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	42 min
May 29, 4:27 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	51 min
May 29, 4:35 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	25 min
May 29, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	48 min
May 29, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	40 min
May 29, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	67 min
May 29, 4:55 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	4 hr
May 29, 5:08 PM EDT	Tornado Warning	PHI	Bucks, Montgomery	27 min
May 29, 5:14 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	3 hr
May 29, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more	34 min
May 29, 5:27 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	4 hr
May 29, 5:33 PM EDT	Tornado Warning	PHI	Bucks	27 min
May 29, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min
May 29, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	41 min
May 29, 6:06 PM EDT	Flash Flood Warning	PHI	Bucks	4 hr
May 29, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	24 min
May 29, 6:35 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	3 hr
May 29, 7:12 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
May 29, 6:02 PM EDT	Special Weather Statement	PHI	New Castle	28 min
May 29, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	34 min
May 29, 6:30 PM EDT	Special Weather Statement	PHI	Kent	30 min
May 29, 6:58 PM EDT	Special Weather Statement	PHI	Kent	32 min

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.