Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 190, NWS Philadelphia/Mount Holly

August 22, 20176 counties in New Jersey; 4 counties in Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 22, 2017, 11:46 PM EDT for 6 counties in New Jersey; 4 counties in Pennsylvania; New Castle County, Delaware. It was in force for 44 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: Aug 22, 2017, 11:46 PM EDT (03:46 UTC)
Expired: Aug 23, 2017, 12:30 AM EDT
In force: 44 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, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Ocean County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 03:46 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
Aug 22, 11:48 PM EDT	TSTM WND GST 47	Philadelphia Intl Airpo, PA
Aug 22, 11:56 PM EDT	TSTM WND DMG	Overbrook, PA	TREE DOWN ACROSS CITY AVENUE IN LOWER MERION. TIME AND LOCATION ESTIMATED.

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
Aug 22, 4:19 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.8 hours before the alert went out and 212 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: 550 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

509 
WUUS51 KPHI 230346
SVRPHI
DEC003-NJC001-005-007-015-029-033-PAC029-045-091-101-230430-
/O.NEW.KPHI.SV.W.0190.170823T0346Z-170823T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1146 PM EDT TUE AUG 22 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  North central Atlantic County in southern New Jersey...
  Northwestern Salem County in southern New Jersey...
  Western Ocean County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1230 AM EDT

* At 1146 PM EDT, severe thunderstorms were located along a line
  extending from near Medford to near Lindenwold to Chester Township
  to Fair Hill, moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Philadelphia, Camden, Wilmington, Newark, Gloucester City, Cherry
  Hill, Evesham, Mount Laurel, Chester, Willingboro, Deptford,
  Voorhees, Medford, West Deptford, Glassboro, Lindenwold, Hammonton,
  Pennsville, Lumberton and Bellmawr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3990 7568 4000 7536 4007 7498 4005 7497
      4009 7484 4009 7449 3975 7448 3967 7469
      3964 7539 3966 7579 3972 7579 3973 7593
TIME...MOT...LOC 0346Z 269DEG 28KT 3993 7477 3977 7499 3985 7542 3970
7585

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

CMS

1 follow-up statement

657 
WWUS51 KPHI 230411
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1211 AM EDT WED AUG 23 2017

NJC029-PAC091-230420-
/O.CAN.KPHI.SV.W.0190.000000T0000Z-170823T0430Z/
Ocean NJ-Montgomery PA-
1211 AM EDT WED AUG 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN OCEAN AND SOUTHEASTERN
MONTGOMERY COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3967 7469 3964 7539 3966 7579 3972 7579
      3973 7593 3984 7576 3992 7534 3999 7521
      4002 7495 4002 7452 3996 7449 3975 7448
TIME...MOT...LOC 0410Z 264DEG 35KT 3991 7492 3989 7506 3981 7535 3975
7553

$$

DEC003-NJC001-005-007-015-033-PAC029-045-101-230430-
/O.CON.KPHI.SV.W.0190.000000T0000Z-170823T0430Z/
New Castle DE-Atlantic NJ-Salem NJ-Camden NJ-Gloucester NJ-
Burlington NJ-Chester PA-Philadelphia PA-Delaware PA-
1211 AM EDT WED AUG 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR NORTHERN NEW CASTLE...NORTH CENTRAL ATLANTIC...NORTHWESTERN
SALEM...CAMDEN...GLOUCESTER...CENTRAL BURLINGTON...SOUTH CENTRAL
CHESTER...SOUTHWESTERN PHILADELPHIA AND SOUTHERN DELAWARE COUNTIES...

At 1210 AM EDT, severe thunderstorms were located along a line
extending from Marlton to Audubon Park to near Chester to Wilmington,
moving east at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Philadelphia, Camden, Wilmington, Newark, Gloucester City, Cherry
Hill, Evesham, Mount Laurel, Chester, Deptford, Voorhees, Medford,
West Deptford, Glassboro, Lindenwold, Hammonton, Pennsville,
Lumberton, Bellmawr and Yeadon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3967 7469 3964 7539 3966 7579 3972 7579
      3973 7593 3984 7576 3992 7534 3999 7521
      4002 7495 4002 7452 3996 7449 3975 7448
TIME...MOT...LOC 0410Z 264DEG 35KT 3991 7492 3989 7506 3981 7535 3975
7553

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

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 8:12 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	48 min
Aug 22, 8:15 PM EDT	Tornado Warning	PHI	Warren	30 min
Aug 22, 8:20 PM EDT	Special Weather Statement	PHI	Sussex	40 min
Aug 22, 8:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset, Warren	60 min
Aug 22, 8:58 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	24 min
Aug 22, 9:42 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	48 min
Aug 22, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	53 min
Aug 22, 10:13 PM EDT	Special Marine Warning	PHI		92 min
Aug 22, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	48 min
Aug 22, 10:37 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	4 hr
Aug 22, 10:40 PM EDT	Areal Flood Advisory	PHI	Mercer	4 hr
Aug 22, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Mercer, Middlesex and 1 more	62 min
Aug 22, 11:39 PM EDT	Special Marine Warning	PHI		66 min
Aug 22, 11:42 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr
Aug 23, 12:06 AM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 23, 12:29 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Ocean	46 min
Aug 23, 12:37 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	4 hr
Aug 23, 1:56 AM EDT	Areal Flood Advisory	PHI	Salem	4 hr
Aug 23, 2:43 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	4 hr
Aug 23, 3:37 AM EDT	Areal Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr
Aug 23, 4:02 AM EDT	Areal Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 22, 9:18 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	4 hr
Aug 22, 9:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Aug 22, 9:40 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	20 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017 Severe Thunderstorm Warnings in Pennsylvania, 2017 Severe Thunderstorm Warnings in Delaware, 2017 Every severe thunderstorm warning in 2017

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.