Alert archive / New Jersey / Tornado Warnings in 2017

Tornado Warning 7, NWS Philadelphia/Mount Holly

July 23, 2017Atlantic County, Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 23, 2017, 11:38 PM EDT for Atlantic County, Cape May County, New Jersey. It was in force for 37 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 23, 2017, 11:38 PM EDT (03:38 UTC)
Expired: Jul 24, 2017, 12:15 AM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Atlantic County, NJ, Cape May County, NJ

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 03:38 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.6 hours before the alert went out and 160 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: 771 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 995 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

As transmitted.

171 
WFUS51 KPHI 240338
TORPHI
NJC001-009-240415-
/O.NEW.KPHI.TO.W.0007.170724T0338Z-170724T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1138 PM EDT SUN JUL 23 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1215 AM EDT
    
* At 1137 PM EDT, a severe thunderstorm capable of producing a
  tornado was located over Strathmere, or near Ocean City, moving
  northeast at 15 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes could be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Marmora around 1155 PM EDT. 
  Beesleys Point around 1200 AM EDT. 
  Ocean City around 1210 AM EDT. 
  Somers Point and Longport around 1215 AM EDT. 

Other locations impacted by this tornadic thunderstorm include
Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3919 7462 3917 7464 3920 7472 3935 7459
      3929 7449
TIME...MOT...LOC 0337Z 221DEG 13KT 3920 7467 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JRK

2 follow-up statements

389 
WWUS51 KPHI 240356
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1156 PM EDT SUN JUL 23 2017

NJC001-240404-
/O.CAN.KPHI.TO.W.0007.000000T0000Z-170724T0415Z/
Atlantic NJ-
1156 PM EDT SUN JUL 23 2017

...THE TORNADO WARNING FOR SOUTHEASTERN ATLANTIC COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning is expected to 
pass to the south and east of the warned area in coastal Atlantic 
County. Therefore, the warning has been cancelled.

LAT...LON 3917 7464 3918 7468 3922 7471 3923 7470
      3933 7457 3933 7455 3932 7458 3930 7457
      3931 7456 3931 7453 3929 7449
TIME...MOT...LOC 0354Z 220DEG 7KT 3921 7465 

$$

NJC009-240415-
/O.CON.KPHI.TO.W.0007.000000T0000Z-170724T0415Z/
Cape May NJ-
1156 PM EDT SUN JUL 23 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
NORTHEASTERN CAPE MAY COUNTY...
    
At 1154 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Strathmere, or near Ocean City, moving northeast at
10 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Ocean City, Somers Point, Longport, Marmora and Beesleys Point 
  around 1215 AM EDT. 

Other locations impacted by this tornadic thunderstorm include
Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

If on or near Strathmere and Ocean City, get away from the water and 
move to safe shelter immediately. If you can hear thunder, you are 
close enough to be struck by lightning. Severe thunderstorms can 
produce large capsizing waves, even on small bodies of water. Move 
into dock and seek safe shelter now! Do not be caught on the water 
in a thunderstorm.

&&

LAT...LON 3917 7464 3918 7468 3922 7471 3923 7470
      3933 7457 3933 7455 3932 7458 3930 7457
      3931 7456 3931 7453 3929 7449
TIME...MOT...LOC 0354Z 220DEG 7KT 3921 7465 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

JRK

219 
WWUS51 KPHI 240408
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1208 AM EDT MON JUL 24 2017

NJC009-240417-
/O.EXP.KPHI.TO.W.0007.000000T0000Z-170724T0415Z/
Cape May NJ-
1208 AM EDT MON JUL 24 2017

...THE TORNADO WARNING FOR NORTHEASTERN CAPE MAY COUNTY WILL EXPIRE
AT 1215 AM EDT...
        
The storm which prompted the warning has moved off the coast just 
south of Ocean City. Therefore the warning will be allowed to 
expire. However heavy rain is still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.

LAT...LON 3917 7464 3918 7468 3922 7471 3923 7470
      3933 7457 3933 7455 3932 7458 3930 7457
      3931 7456 3931 7453 3929 7449
TIME...MOT...LOC 0407Z 221DEG 13KT 3924 7461 

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 9:39 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	4 hr
Jul 23, 10:18 PM EDT	Flash Flood Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	8 hr
Jul 23, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	52 min
Jul 23, 10:54 PM EDT	Special Weather Statement	PHI	Gloucester	51 min
Jul 23, 11:41 PM EDT	Special Marine Warning	PHI		64 min
Jul 23, 11:43 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean, Salem	6 hr
Jul 23, 11:50 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Monmouth, Ocean	6 hr
Jul 24, 12:04 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	41 min
Jul 24, 12:35 AM EDT	Special Marine Warning	PHI		55 min
Jul 24, 12:56 AM EDT	Special Weather Statement	PHI	Atlantic	34 min
Jul 24, 1:23 AM EDT	Special Marine Warning	PHI		97 min
Jul 24, 1:33 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	5 hr
Jul 24, 2:02 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	43 min
Jul 24, 2:08 AM EDT	Special Marine Warning	PHI		97 min
Jul 24, 2:10 AM EDT	Special Marine Warning	PHI		95 min
Jul 24, 2:34 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	41 min
Jul 24, 2:44 AM EDT	Special Marine Warning	PHI		91 min
Jul 24, 3:00 AM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester, Salem	4 hr
Jul 24, 3:03 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	57 min
Jul 24, 3:17 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Warren	118 min
Jul 24, 3:21 AM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	3 hr
Jul 24, 3:34 AM EDT	Special Marine Warning	PHI		116 min
Jul 24, 3:36 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 2 more	6 hr
Jul 24, 3:55 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	50 min
Jul 24, 9:30 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset	60 min
Jul 24, 10:04 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		8 hr
Jul 24, 10:40 AM EDT	Areal Flood Warning	PHI	Cumberland	10 hr
Jul 24, 2:55 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean	11 hr
Jul 24, 7:07 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	113 min
Jul 24, 7:48 PM EDT	Areal Flood Advisory	PHI	Hunterdon	117 min

Nearby

Tornado Warnings in New Jersey, 2017 Every tornado warning in 2017 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.