Alert archive / New Jersey / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 63, NWS Philadelphia/Mount Holly

June 22, 20104 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2010, 6:29 PM EDT for 4 states. It was in force for 46 min. 6 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: Jun 22, 2010, 6:29 PM EDT (22:29 UTC)
Expired: Jun 22, 2010, 7:15 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 22:29 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
Jun 22, 6:33 PM EDT	HAIL 1	Newark, DE	QUARTER SIZE HAIL REPORTED IN NEWARK.
Jun 22, 6:40 PM EDT	TSTM WND GST 62	Bear, DE	MEASURED WIND GUST OF 62MPH AND QUARTER SIZE HAIL REPORTED IN BEAR.
Jun 22, 6:42 PM EDT	HAIL 1	Newark, DE	QUARTER SIZE HAIL REPORTED IN NEWARK.
Jun 22, 6:44 PM EDT	HAIL 1.25	Bear, DE	HALF DOLLAR SIZE HAIL REPORTED IN BEAR.
Jun 22, 6:45 PM EDT	HAIL 0.88	Bear, DE	NICKEL SIZE HAIL REPORTED IN BEAR.
Jun 22, 7:21 PM EDT	HAIL 1	Greenwich, NJ	QUARTER SIZE HAIL REPORTED IN GREENWICH.

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
Jun 22, 5:06 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.5 hours before the alert went out and 47 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: 20 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

751 
WUUS51 KPHI 222229
SVRPHI
DEC003-MDC015-NJC011-033-PAC029-222315-
/O.NEW.KPHI.SV.W.0063.100622T2229Z-100622T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
629 PM EDT TUE JUN 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF NEWARK...
  EXTREME SOUTH CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 715 PM EDT

* AT 626 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BARKSDALE...OR NEAR NEWARK...AND MOVING SOUTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEAR AROUND 635 PM EDT...
  SAINT GEORGES AROUND 640 PM EDT...
  DELAWARE CITY AROUND 645 PM EDT...
  PORT PENN AND SALEM AROUND 650 PM EDT...
  GREENWICH AND SHILOH AROUND 710 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
SOUTHERN NEW JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3975 7580 3965 7558 3959 7559 3962 7558
      3964 7556 3951 7528 3932 7533 3933 7537
      3943 7548 3946 7555 3950 7557 3952 7554
      3958 7554 3958 7556 3946 7558 3942 7553
      3938 7551 3967 7587
TIME...MOT...LOC 2229Z 306DEG 35KT 3964 7576

$$

DRAG

1 follow-up statement

136 
WWUS51 KPHI 222244
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
644 PM EDT TUE JUN 22 2010

MDC015-PAC029-222252-
/O.CAN.KPHI.SV.W.0063.000000T0000Z-100622T2315Z/
CECIL MD-CHESTER PA-
644 PM EDT TUE JUN 22 2010

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTH CENTRAL CHESTER
AND NORTHEASTERN CECIL COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
SOUTHERN NEW JERSEY AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3966 7575 3965 7558 3959 7559 3962 7558
      3964 7556 3951 7528 3932 7533 3933 7537
      3943 7548 3946 7555 3950 7557 3952 7554
      3958 7554 3958 7556 3946 7558 3942 7553
      3938 7551 3957 7574
TIME...MOT...LOC 2242Z 306DEG 35KT 3957 7563

$$

DEC003-NJC011-033-222315-
/O.CON.KPHI.SV.W.0063.000000T0000Z-100622T2315Z/
SALEM NJ-CUMBERLAND NJ-NEW CASTLE DE-
644 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR CENTRAL NEW CASTLE...NORTHWESTERN CUMBERLAND AND SOUTHWESTERN
SALEM COUNTIES...

AT 639 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SAINT GEORGES...OR 8 MILES SOUTHEAST OF NEWARK...MOVING
SOUTHEAST AT 40 MPH.

THERE HAVE BEEN MANY REPORTS OF DAMAGING WIND AND QUARTER SIZED HAIL
FROM NEAR NEWARK DELAWARE INTO FAR NORTHEAST MARYLAND. 


THE SEVERE THUNDERSTORM WILL BE NEAR...
  PORT PENN AND SALEM BY 650 PM EDT...
  GREENWICH AND SHILOH BY 710 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
SOUTHERN NEW JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3966 7575 3965 7558 3959 7559 3962 7558
      3964 7556 3951 7528 3932 7533 3933 7537
      3943 7548 3946 7555 3950 7557 3952 7554
      3958 7554 3958 7556 3946 7558 3942 7553
      3938 7551 3957 7574
TIME...MOT...LOC 2242Z 306DEG 35KT 3957 7563

$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 4:38 AM EDT	Excessive Heat Warning	PHI	New Castle	60 hr
Jun 22, 5:15 PM EDT	Special Weather Statement	PHI	New Castle	60 min
Jun 22, 5:29 PM EDT	Special Weather Statement	PHI	New Castle	46 min
Jun 22, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	49 min
Jun 22, 7:48 PM EDT	Special Weather Statement	PHI	New Castle	42 min
Jun 22, 6:31 PM EDT	Special Marine Warning	PHI		44 min
Jun 22, 6:50 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Somerset	55 min
Jun 22, 7:12 PM EDT	Special Marine Warning	PHI		48 min
Jun 22, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	45 min
Jun 22, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	48 min
Jun 22, 3:37 PM EDT	Special Weather Statement	PHI	Carbon	38 min
Jun 22, 4:15 PM EDT	Special Weather Statement	PHI	Berks	60 min
Jun 22, 4:23 PM EDT	Special Weather Statement	PHI	Berks	67 min
Jun 22, 4:38 PM EDT	Special Weather Statement	PHI	Chester	52 min
Jun 22, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	34 min
Jun 22, 5:00 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more	60 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2010 Severe Thunderstorm Warnings in Delaware, 2010 Severe Thunderstorm Warnings in Maryland, 2010 Every severe thunderstorm warning in 2010

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.