Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 43, NWS Philadelphia/Mount Holly

July 3, 2018Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 3, 2018, 6:18 PM EDT for Delaware County, Philadelphia County, Pennsylvania. It was in force for 42 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: Jul 3, 2018, 6:18 PM EDT (22:18 UTC)
Expired: Jul 3, 2018, 7:00 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Delaware County, PA, Philadelphia County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 217 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: 574 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

680 
WUUS51 KPHI 032218
SVRPHI
PAC045-101-032300-
/O.NEW.KPHI.SV.W.0043.180703T2218Z-180703T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
618 PM EDT TUE JUL 3 2018

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  East central Delaware County in southeastern Pennsylvania...

* Until 700 PM EDT.

* At 617 PM EDT, a severe thunderstorm was located over Gloucester
  City, and is nearly stationary.

  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, Camden, Folcroft, Paulsboro, Ben Franklin Bridge,
  Darby Township, South Philadelphia, Philadelphia International
  Airport, Norwood, Sharon Hill and Colwyn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3997 7515 3996 7513 3990 7513 3988 7515
      3988 7519 3985 7525 3985 7528 3988 7530
TIME...MOT...LOC 2217Z 318DEG 1KT 3989 7515 

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

SFJ

2 follow-up statements

951 
WWUS51 KPHI 032228
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
628 PM EDT TUE JUL 3 2018

PAC045-101-032300-
/O.CON.KPHI.SV.W.0043.000000T0000Z-180703T2300Z/
Philadelphia PA-Delaware PA-
628 PM EDT TUE JUL 3 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHWESTERN PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES...

At 628 PM EDT, a severe thunderstorm was located over Brooklawn, or
over Gloucester City, and is nearly stationary.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Philadelphia, Camden, Folcroft, Paulsboro, Ben Franklin Bridge, Darby
Township, South Philadelphia, Philadelphia International Airport,
Norwood, Sharon Hill and Colwyn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3997 7515 3996 7513 3990 7513 3988 7515
      3988 7519 3985 7525 3985 7528 3988 7530
TIME...MOT...LOC 2228Z 318DEG 1KT 3989 7515 

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

SFJ

851 
WWUS51 KPHI 032251
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
651 PM EDT TUE JUL 3 2018

PAC045-101-032300-
/O.EXP.KPHI.SV.W.0043.000000T0000Z-180703T2300Z/
Philadelphia PA-Delaware PA-
651 PM EDT TUE JUL 3 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PHILADELPHIA AND
EAST CENTRAL DELAWARE COUNTIES WILL EXPIRE AT 700 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 3997 7515 3996 7513 3990 7513 3988 7515
      3988 7519 3985 7525 3985 7528 3988 7530
TIME...MOT...LOC 2250Z 318DEG 1KT 3989 7515 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 2:15 PM EDT	Special Weather Statement	PHI	Delaware	30 min
Jul 3, 3:00 PM EDT	Special Weather Statement	PHI	Philadelphia	60 min
Jul 3, 3:11 PM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	50 min
Jul 3, 4:06 PM EDT	Special Weather Statement	PHI	Montgomery	54 min
Jul 3, 4:30 PM EDT	Special Weather Statement	PHI	Bucks	60 min
Jul 3, 5:24 PM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	4 hr
Jul 3, 5:29 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	4 hr
Jul 3, 5:30 PM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Jul 3, 5:45 PM EDT	Flash Flood Warning	PHI	Delaware, Montgomery, Philadelphia	4 hr
Jul 3, 6:03 PM EDT	Special Weather Statement	PHI	Monroe	57 min
Jul 3, 6:15 PM EDT	Special Weather Statement	PHI	Chester	60 min
Jul 3, 6:21 PM EDT	Special Weather Statement	PHI	Delaware	24 min
Jul 3, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	50 min
Jul 3, 6:37 PM EDT	Flash Flood Warning	PHI	Bucks, Philadelphia	3 hr
Jul 3, 6:40 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	4 hr
Jul 3, 6:50 PM EDT	Special Weather Statement	PHI	Delaware	55 min
Jul 3, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	51 min
Jul 3, 6:58 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
Jul 3, 7:03 PM EDT	Special Weather Statement	PHI	Northampton	57 min
Jul 3, 7:06 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	2 hr
Jul 3, 7:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	21 min
Jul 3, 7:35 PM EDT	Special Weather Statement	PHI	Chester	25 min
Jul 3, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jul 3, 7:54 PM EDT	Flash Flood Warning	PHI	Chester	4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2018 Every severe thunderstorm warning in 2018

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.