Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 99, NWS Philadelphia/Mount Holly

July 14, 2017Atlantic County, Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2017, 4:12 PM EDT for Atlantic County, Cape May County, New Jersey. It was in force for 63 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, 4:12 PM EDT (20:12 UTC)
Expired: Jul 14, 2017, 5:15 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Cape May County, NJ

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 20:15 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
Jul 14, 4:15 PM EDT	TSTM WND GST 50	Mays Landing, NJ
Jul 14, 4:15 PM EDT	HAIL 0.88	Mays Landing, NJ
Jul 14, 4:19 PM EDT	TSTM WND GST 50	Egg Harbor Twp, NJ
Jul 14, 4:19 PM EDT	HAIL 0.75	Egg Harbor Twp, NJ

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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.2 hours before the alert went out and 183 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: 908 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

577 
WUUS51 KPHI 142012
SVRPHI
NJC001-009-142115-
/O.NEW.KPHI.SV.W.0099.170714T2012Z-170714T2115Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Atlantic County in southern New Jersey...
  Northeastern Cape May County in southern New Jersey...

* Until 515 PM EDT

* At 412 PM EDT, a severe thunderstorm was located over Mays Landing,
  or 14 miles northwest of Ocean City, moving southeast at 20 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. 

* This severe thunderstorm will be near,
  Pomona around 425 PM EDT. 
  English Creek around 430 PM EDT. 
  Northfield, Absecon and Corbin City around 440 PM EDT. 
  Ocean City, Pleasantville, Somers Point and Beesleys Point around 
  445 PM EDT. 
  Ventnor City and Margate City around 450 PM EDT. 
  Atlantic City, Brigantine and Longport around 455 PM EDT. 

Other locations impacted by this severe thunderstorm include Linwood.

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 3942 7430 3921 7460 3940 7477 3954 7463
      3948 7426
TIME...MOT...LOC 2012Z 307DEG 18KT 3946 7471 

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

Robertson

2 follow-up statements

646 
WWUS51 KPHI 142046
SVSPHI

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

NJC009-142055-
/O.CAN.KPHI.SV.W.0099.000000T0000Z-170714T2115Z/
Cape May NJ-
446 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CAPE MAY COUNTY
IS CANCELLED...
    
The storms which prompted this warning have exited the warned area. 
Therefore the warning will be allowed to expire. However a Severe 
Thunderstorm Warning still remains in effect for portions of 
Cape May county.

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

LAT...LON 3944 7429 3927 7451 3939 7465 3951 7451
TIME...MOT...LOC 2045Z 294DEG 18KT 3939 7450 

$$

NJC001-142115-
/O.CON.KPHI.SV.W.0099.000000T0000Z-170714T2115Z/
Atlantic NJ-
446 PM EDT FRI JUL 14 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHEASTERN ATLANTIC COUNTY...

At 445 PM EDT, a severe thunderstorm was located over Pleasantville,
or near Atlantic City, moving southeast 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. 

This severe storm will be near...
  Ventnor City around 450 PM EDT. 
  Atlantic City and Brigantine around 500 PM EDT. 

Other locations impacted by this severe thunderstorm include Linwood.

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 3944 7429 3927 7451 3939 7465 3951 7451
TIME...MOT...LOC 2045Z 294DEG 18KT 3939 7450 

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

Robertson

419 
WWUS51 KPHI 142113
SVSPHI

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

NJC001-142122-
/O.EXP.KPHI.SV.W.0099.000000T0000Z-170714T2115Z/
Atlantic NJ-
513 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ATLANTIC COUNTY
WILL EXPIRE AT 515 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

However a Severe Thunderstorm Warning still remains in effect for 
Atlantic county.

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


LAT...LON 3944 7429 3927 7451 3939 7465 3951 7451
TIME...MOT...LOC 2112Z 307DEG 18KT 3932 7437 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:17 PM EDT	Special Weather Statement	PHI	Camden	43 min
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, 7:21 AM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	3 hr
Jul 14, 11:40 AM EDT	Flash Flood Watch	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	11 hr
Jul 14, 2:57 PM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	3 hr
Jul 14, 3:07 PM EDT	Special Marine Warning	PHI		53 min
Jul 14, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	12 min
Jul 14, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	67 min
Jul 14, 3:25 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Ocean, Salem	4 hr
Jul 14, 3:34 PM EDT	Flash Flood Warning	PHI	Gloucester, Salem	3 hr
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, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	66 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 New Jersey, 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.