Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 95, NWS Philadelphia/Mount Holly

July 14, 20174 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2017, 3:23 PM EDT for 4 states. It was in force for 67 min. 4 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 14, 2017, 3:23 PM EDT (19:23 UTC)
Expired: Jul 14, 2017, 4:30 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Cecil County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 95 km from the middle of the area, began a volume at 19:23 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 14, 3:45 PM EDT	TSTM WND GST 55	Mannington Twp, NJ
Jul 14, 3:47 PM EDT	TSTM WND DMG	Alloway, NJ	DAMAGE REPORTED... TYPE UNKNOWN.
Jul 14, 3:50 PM EDT	MARINE TSTM WIND 43	Delaware City, DE
Jul 14, 4:00 PM EDT	TSTM WND DMG	1 N Woods Mills, NJ	DOWNED TREE AND WIRES BLOCKING US 40. 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 14, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 161 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: 403 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

125 
WUUS51 KPHI 141923
SVRPHI
DEC003-MDC015-NJC015-033-PAC029-045-142030-
/O.NEW.KPHI.SV.W.0095.170714T1923Z-170714T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
323 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Cecil County in northeastern Maryland...
  Salem County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  South central Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 430 PM EDT

* At 322 PM EDT, severe thunderstorms were located along a line
  extending from Arden to Bear to near Bay View, moving southeast at
  30 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Wilmington, Newark, Elkton, Calvert, Chester, Glassboro,
  Pennsville, Pitman, Carneys Point, Elsmere, Paulsboro, New Castle,
  Penns Grove, Salem, North East, Woodstown, Alloway, Rising Sun,
  Quinton and Swedesboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3972 7582 3992 7553 3977 7504 3975 7503
      3947 7539 3948 7600 3952 7598 3955 7603
      3955 7608 3965 7616 3968 7621
TIME...MOT...LOC 1922Z 296DEG 25KT 3982 7547 3963 7569 3963 7602 

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

Robertson

3 follow-up statements

664 
WWUS51 KPHI 141946
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
346 PM EDT FRI JUL 14 2017

PAC029-045-141956-
/O.CAN.KPHI.SV.W.0095.000000T0000Z-170714T2030Z/
Chester PA-Delaware PA-
346 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CHESTER AND
SOUTHWESTERN DELAWARE COUNTIES IS CANCELLED...

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

A severe thunderstorm watch remains in effect until 900 PM EDT for
northern Delaware...northeastern Maryland...southern New Jersey...and
southeastern Pennsylvania.

LAT...LON 3967 7607 3969 7565 3985 7530 3978 7506
      3975 7503 3947 7539 3948 7600 3952 7598
      3955 7603 3955 7608 3963 7614
TIME...MOT...LOC 1946Z 296DEG 25KT 3975 7529 3956 7551 3956 7584 

$$

DEC003-MDC015-NJC015-033-142030-
/O.CON.KPHI.SV.W.0095.000000T0000Z-170714T2030Z/
New Castle DE-Cecil MD-Salem NJ-Gloucester NJ-
346 PM EDT FRI JUL 14 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHERN NEW CASTLE...NORTHERN CECIL...SALEM AND NORTHWESTERN
GLOUCESTER COUNTIES...

At 346 PM EDT, severe thunderstorms were located along a line
extending from Swedesboro to near Salem to Brantwood, moving
southeast at 30 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         damage to trees and power lines. 

Locations impacted include...
Wilmington, Newark, Elkton, Glassboro, Pennsville, Pitman, Carneys
Point, Paulsboro, New Castle, Penns Grove, Salem, North East,
Woodstown, Alloway, Quinton, Swedesboro, Delaware City, Charlestown,
Newport and Barksdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3967 7607 3969 7565 3985 7530 3978 7506
      3975 7503 3947 7539 3948 7600 3952 7598
      3955 7603 3955 7608 3963 7614
TIME...MOT...LOC 1946Z 296DEG 25KT 3975 7529 3956 7551 3956 7584 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Robertson

194 
WWUS51 KPHI 142005
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
405 PM EDT FRI JUL 14 2017

DEC003-MDC015-142014-
/O.CAN.KPHI.SV.W.0095.000000T0000Z-170714T2030Z/
New Castle DE-Cecil MD-
405 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE AND
NORTHERN CECIL COUNTIES IS CANCELLED...

The storms which prompted the warning have weakend and moved out of 
the warned area. Therefore, the warning has been cancelled. However 
heavy rain and gusty winds remain possible with other storms.

A severe thunderstorm watch remains in effect until 900 PM EDT for
northern Delaware...and southern New Jersey.

LAT...LON 3951 7558 3953 7545 3978 7516 3975 7503
      3947 7539 3947 7558 3948 7559
TIME...MOT...LOC 2004Z 287DEG 18KT 3970 7515 3951 7537 3948 7560 

$$

NJC015-033-142030-
/O.CON.KPHI.SV.W.0095.000000T0000Z-170714T2030Z/
Salem NJ-Gloucester NJ-
405 PM EDT FRI JUL 14 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR CENTRAL SALEM AND CENTRAL GLOUCESTER COUNTIES...

At 404 PM EDT, severe thunderstorms were located along a line
extending from near Glassboro to near Quinton to near Port Penn,
moving east at 20 mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect damage to 
         trees and power lines. 

These severe storms will be near...
  Glassboro, Pitman and Mullica Hill around 410 PM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3951 7558 3953 7545 3978 7516 3975 7503
      3947 7539 3947 7558 3948 7559
TIME...MOT...LOC 2004Z 287DEG 18KT 3970 7515 3951 7537 3948 7560 

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

Robertson

707 
WWUS51 KPHI 142022
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
422 PM EDT FRI JUL 14 2017

NJC015-033-142031-
/O.EXP.KPHI.SV.W.0095.000000T0000Z-170714T2030Z/
Salem NJ-Gloucester NJ-
422 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SALEM AND CENTRAL
GLOUCESTER COUNTIES WILL EXPIRE AT 430 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM EDT for
northern Delaware...and southern New Jersey.

LAT...LON 3951 7558 3953 7545 3978 7516 3975 7503
      3947 7539 3947 7558 3948 7559
TIME...MOT...LOC 2021Z 270DEG 25KT 3965 7503 3946 7525 3943 7548 

$$

Drag

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:09 PM EDT	Special Weather Statement	PHI	Kent	36 min
Jul 13, 8:29 PM EDT	Special Weather Statement	PHI	Kent	31 min
Jul 13, 10:03 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 13, 10:15 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jul 13, 10:39 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	51 min
Jul 14, 9:02 AM EDT	Special Weather Statement	PHI	New Castle	28 min
Jul 14, 11:40 AM EDT	Flash Flood Watch	PHI	Kent, New Castle	11 hr
Jul 14, 12:06 PM EDT	Heat Advisory	PHI	Kent, Sussex	7 hr
Jul 14, 2:14 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jul 14, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Jul 14, 2:53 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	12 min
Jul 14, 3:25 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 14, 3:34 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	66 min
Jul 14, 5:14 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jul 14, 5:24 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 14, 5:30 PM EDT	River Flood Warning	PHI	New Castle	7 hr
Jul 14, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Kent	65 min
Jul 14, 5:51 PM EDT	Special Weather Statement	PHI	Sussex	39 min
Jul 14, 6:10 PM EDT	Flash Flood Warning	PHI	Kent	3 hr
Jul 14, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min
Jul 14, 6:32 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 14, 6:48 PM EDT	Special Weather Statement	PHI	Sussex	42 min
Jul 14, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Jul 13, 8:17 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	43 min
Jul 14, 7:21 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	3 hr
Jul 14, 12:30 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Montgomery, Northampton	4 hr
Jul 14, 1:58 PM EDT	Special Weather Statement	PHI	Chester	62 min
Jul 14, 2:57 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	3 hr
Jul 14, 9:23 AM EDT	Special Weather Statement	PHI	Cecil	37 min
Jul 14, 2:46 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jul 14, 3:10 PM EDT	Flash Flood Warning	PHI	Cecil	2 hr
Jul 14, 3:52 PM EDT	Flash Flood Warning	PHI	Talbot	53 min
Jul 14, 3:57 PM EDT	Flash Flood Warning	PHI	Cecil, Kent	2 hr
Jul 14, 4:00 PM EDT	Special Weather Statement	PHI	Caroline	45 min
Jul 14, 4:05 PM EDT	Special Weather Statement	PHI	Kent	40 min
Jul 14, 4:48 PM EDT	Special Weather Statement	PHI	Queen Anne's	27 min
Jul 14, 4:59 PM EDT	Flash Flood Warning	PHI	Queen Anne's	4 hr
Jul 14, 5:27 PM EDT	Special Weather Statement	PHI	Queen Anne's	63 min
Jul 14, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	51 min
Jul 14, 5:58 PM EDT	Flash Flood Warning	PHI	Talbot	3 hr
Jul 13, 8:26 PM EDT	Special Weather Statement	PHI	Cape May	34 min
Jul 13, 8:27 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	4 hr
Jul 13, 8:49 PM EDT	Special Weather Statement	PHI	Cumberland	26 min
Jul 13, 8:51 PM EDT	Special Weather Statement	PHI	Atlantic	54 min
Jul 13, 9:07 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	53 min
Jul 13, 9:46 PM EDT	Special Weather Statement	PHI	Atlantic	14 min
Jul 13, 9:50 PM EDT	Special Marine Warning	PHI		115 min
Jul 13, 9:57 PM EDT	Special Weather Statement	PHI	Cape May	33 min
Jul 13, 10:42 PM EDT	Special Marine Warning	PHI		93 min
Jul 14, 3:07 PM EDT	Special Marine Warning	PHI		53 min
Jul 14, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester	55 min
Jul 14, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	47 min
Jul 14, 3:47 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	3 hr
Jul 14, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	63 min
Jul 14, 4:13 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	3 hr
Jul 14, 4:18 PM EDT	Special Marine Warning	PHI		57 min
Jul 14, 4:25 PM EDT	Special Marine Warning	PHI		95 min
Jul 14, 4:44 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	61 min
Jul 14, 4:54 PM EDT	Special Marine Warning	PHI		66 min
Jul 14, 5:47 PM EDT	Special Weather Statement	PHI	Cape May	13 min
Jul 14, 5:53 PM EDT	Special Marine Warning	PHI		52 min
Jul 14, 6:32 PM EDT	Special Marine Warning	PHI		88 min
Jul 14, 7:08 PM EDT	Special Marine Warning	PHI		97 min
Jul 14, 7:28 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Severe Thunderstorm Warnings in New Jersey, 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.