Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 12, 2017, 11:10 PM EST for 4 states. It was in force for 50 min. 3 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
- Feb 12, 2017, 11:10 PM EST (04:10 UTC)
- Expired
- Feb 13, 2017, 12:00 AM EST
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Cecil County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 04:11 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 |
|---|---|---|---|
| Feb 12, 11:20 PM EST | TSTM WND DMG | Fairview, PA | 3 LARGE TREES SNAPPED OR UPROOTED |
| Feb 12, 11:30 PM EST | TSTM WND GST 56 | Morris, NJ | |
| Feb 12, 11:40 PM EST | TSTM WND GST 57 | Morris, NJ |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.2 hours before the alert went out and 180 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.
- Mixed-layer CAPE
- 44 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1215 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
363
WUUS51 KPHI 130410
SVRPHI
DEC003-MDC015-NJC001-005-007-011-015-025-029-033-PAC017-029-045-091-
101-130500-
/O.NEW.KPHI.SV.W.0001.170213T0410Z-170213T0500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1110 PM EST SUN FEB 12 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...
Ocean County in southern New Jersey...
Camden County in southern New Jersey...
Atlantic County in southern New Jersey...
Cumberland County in southern New Jersey...
Salem County in southern New Jersey...
Gloucester County in southern New Jersey...
Burlington County in southern New Jersey...
Southwestern Monmouth County in central New Jersey...
Southern Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
Chester County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until midnight EST
* At 1108 PM EST, severe thunderstorms were located along a line
extending from near Plymouth Meeting to near Bel Air North, moving
east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Philadelphia, Toms River, Camden, Wilmington, Vineland, Newark,
Millville, Bridgeton, Middletown, West Chester, Elkton, Gloucester
City, Cumberland, Lakewood, Calvert, Bensalem, Jackson, Evesham,
Mount Laurel and Norristown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3983 7408 3949 7451 3922 7502 3931 7538
3939 7548 3929 7540 3929 7546 3931 7543
3936 7551 3929 7568 3930 7576 3938 7578
3938 7605 3952 7598 3955 7608 3972 7623
3976 7606 3995 7600 4024 7571 4006 7403
TIME...MOT...LOC 0408Z 281DEG 68KT 4010 7524 3960 7633
HAIL...<.75IN
WIND...60MPH
$$
JRK2 follow-up statements
496
WWUS51 KPHI 130438
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1138 PM EST SUN FEB 12 2017
NJC025-PAC017-029-130445-
/O.CAN.KPHI.SV.W.0001.000000T0000Z-170213T0500Z/
Monmouth NJ-Bucks PA-Chester PA-
1138 PM EST SUN FEB 12 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MONMOUTH...
SOUTHEASTERN BUCKS AND CHESTER COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of
the warned area. Therefore the warning has been cancelled.
LAT...LON 3952 7446 3922 7502 3931 7537 3939 7548
3929 7540 3936 7551 3929 7568 3930 7576
3938 7578 3938 7605 3943 7600 3953 7599
4009 7528 4006 7501 3985 7407
TIME...MOT...LOC 0435Z 290DEG 59KT 3995 7500 3956 7534 3941 7579
$$
DEC003-MDC015-NJC001-005-007-011-015-029-033-PAC045-091-101-130500-
/O.CON.KPHI.SV.W.0001.000000T0000Z-170213T0500Z/
New Castle DE-Cecil MD-Atlantic NJ-Cumberland NJ-Salem NJ-Ocean NJ-
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Philadelphia PA-
Delaware PA-
1138 PM EST SUN FEB 12 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EST
FOR NEW CASTLE...SOUTHEASTERN CECIL...ATLANTIC...CUMBERLAND...
SALEM...CENTRAL OCEAN...CAMDEN...GLOUCESTER...BURLINGTON...
SOUTHEASTERN MONTGOMERY...PHILADELPHIA AND DELAWARE COUNTIES...
At 1135 PM EST, severe thunderstorms were located along a line
extending from Cherry Hill Mall to Alloway to Warwick, moving east at
70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated. This line has also had a history of
producing wind damage and gusts near 60 mph across southern
Pennsylvania, central Maryland and northern Virginia.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Philadelphia, Camden, Wilmington, Vineland, Newark, Millville,
Bridgeton, Middletown, Elkton, Gloucester City, Cumberland, Cherry
Hill, Evesham, Mount Laurel, Chester, Willingboro, Deptford,
Voorhees, Medford and West Deptford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3952 7446 3922 7502 3931 7537 3939 7548
3929 7540 3936 7551 3929 7568 3930 7576
3938 7578 3938 7605 3943 7600 3953 7599
4009 7528 4006 7501 3985 7407
TIME...MOT...LOC 0435Z 290DEG 59KT 3995 7500 3956 7534 3941 7579
HAIL...<.75IN
WIND...60MPH
$$
JRK101
WWUS51 KPHI 130459
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1159 PM EST SUN FEB 12 2017
DEC003-MDC015-NJC001-005-007-011-015-029-033-PAC045-091-101-130507-
/O.EXP.KPHI.SV.W.0001.000000T0000Z-170213T0500Z/
New Castle DE-Cecil MD-Atlantic NJ-Cumberland NJ-Salem NJ-Ocean NJ-
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Philadelphia PA-
Delaware PA-
1159 PM EST SUN FEB 12 2017
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...SOUTHEASTERN
CECIL...ATLANTIC...CUMBERLAND...SALEM...CENTRAL OCEAN...CAMDEN...
GLOUCESTER...BURLINGTON...SOUTHEASTERN MONTGOMERY...PHILADELPHIA AND
DELAWARE COUNTIES WILL EXPIRE AT MIDNIGHT EST...
The storms which prompted the warning have moved out of the
Philadelphia area. Therefore the warning will be allowed to expire.
Remember, a Severe Thunderstorm Warning still remains in effect for
portions of southern New Jersey until 1245 AM.
LAT...LON 3952 7446 3922 7502 3931 7537 3939 7548
3929 7540 3936 7551 3929 7568 3930 7576
3938 7578 3938 7605 3943 7600 3953 7599
4009 7528 4006 7501 3985 7407
TIME...MOT...LOC 0457Z 281DEG 68KT 3988 7453 3949 7487 3934 7532
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 12, 10:20 PM EST | Special Weather Statement | PHI | Berks, Lehigh, Montgomery | 70 min |
| Feb 13, 1:25 AM EST | Special Weather Statement | PHI | Monroe | 50 min |
| Feb 12, 11:33 PM EST | Special Marine Warning | PHI | 87 min | |
| Feb 12, 11:53 PM EST | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 52 min |
| Feb 13, 12:02 AM EST | Special Marine Warning | PHI | 88 min | |
| Feb 13, 12:29 PM EST | Gale Warning | PHI | 9 hr | |
| Feb 12, 11:14 PM EST | Severe Thunderstorm Warning | PHI | Kent | 46 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2017Severe Thunderstorm Warnings in Pennsylvania, 2017Severe Thunderstorm Warnings in Delaware, 2017Every 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.