Alert archive / Delaware / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 159, NWS Philadelphia/Mount Holly

August 4, 2012Kent County, New Castle County, Delaware; Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2012, 2:13 PM EDT for Kent County, New Castle County, Delaware; Salem County, New Jersey. It was in force for 62 min. 1 report 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: Aug 4, 2012, 2:13 PM EDT (18:13 UTC)
Expired: Aug 4, 2012, 3:15 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 18:13 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
Aug 4, 2:23 PM EDT	TSTM WND DMG	Townsend, DE	WIRES DOWN ALONG DEER RUN ROAD IN TOWNSEND.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.2 hours before the alert went out and 169 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: 2272 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 38 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.

007 
WUUS51 KPHI 041813
SVRPHI
DEC001-003-NJC033-041915-
/O.NEW.KPHI.SV.W.0159.120804T1813Z-120804T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 PM EDT SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN KENT COUNTY IN CENTRAL DELAWARE...
  SOUTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF MIDDLETOWN...
  SOUTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 315 PM EDT

* AT 211 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
  GREEN SPRING...OR 6 MILES SOUTHEAST OF MIDDLETOWN...AND MOVING
  NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTHEAST OF MIDDLETOWN AROUND 225 PM EDT...
  7 MILES SOUTHEAST OF MOUNT PLEASANT AROUND 250 PM EDT...
  HOPE CREEK AROUND 300 PM EDT...
  PORT PENN AROUND 310 PM EDT...
  DELAWARE CITY...HANCOCKS BRIDGE...6 MILES SOUTHEAST OF SAINT
  GEORGES AND 6 MILES SOUTHWEST OF SALEM AROUND 315 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3962 7560 3960 7560 3961 7557 3957 7534
      3939 7544 3943 7547 3946 7555 3950 7556
      3948 7558 3946 7558 3942 7553 3934 7547
      3926 7551 3926 7576 3965 7578
TIME...MOT...LOC 1813Z 205DEG 9KT 3939 7564

$$

IOVINO

1 follow-up statement

449 
WWUS51 KPHI 041842
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
242 PM EDT SAT AUG 4 2012

NJC033-041852-
/O.CAN.KPHI.SV.W.0159.000000T0000Z-120804T1915Z/
SALEM NJ-
242 PM EDT SAT AUG 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SALEM COUNTY IS
CANCELLED...

THE PART OF THE STORM MOVING ACROSS THE DELAWARE RIVER AND BAY HAS 
WEAKENED.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3962 7560 3960 7560 3961 7557 3950 7556
      3948 7558 3946 7558 3942 7553 3934 7547
      3926 7551 3926 7576
TIME...MOT...LOC 1842Z 205DEG 9KT 3946 7560

$$

DEC001-003-041915-
/O.CON.KPHI.SV.W.0159.000000T0000Z-120804T1915Z/
NEW CASTLE DE-KENT DE-
242 PM EDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHWESTERN KENT AND SOUTHEASTERN NEW CASTLE COUNTIES...

AT 241 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 ODESSA...OR 6 MILES EAST OF MIDDLETOWN...MOVING
NORTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PORT PENN BY 305 PM EDT...
  DELAWARE CITY BY 315 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3962 7560 3960 7560 3961 7557 3950 7556
      3948 7558 3946 7558 3942 7553 3934 7547
      3926 7551 3926 7576
TIME...MOT...LOC 1842Z 205DEG 9KT 3946 7560

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 1:18 PM EDT	Special Weather Statement	PHI	New Castle	57 min
Aug 4, 2:43 PM EDT	Areal Flood Advisory	PHI	New Castle	105 min
Aug 4, 3:31 PM EDT	Flash Flood Warning	PHI	New Castle	57 min
Aug 4, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	28 min
Aug 4, 5:07 PM EDT	Special Weather Statement	PHI	Kent	53 min
Aug 4, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	34 min
Aug 4, 2:28 PM EDT	Special Marine Warning	PHI		62 min
Aug 4, 2:53 PM EDT	Special Weather Statement	PHI	Mercer	67 min
Aug 4, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	54 min
Aug 4, 3:35 PM EDT	Special Marine Warning	PHI		38 min
Aug 4, 3:42 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	63 min
Aug 4, 3:47 PM EDT	Small Craft Advisory	PHI		39 hr
Aug 4, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	59 min
Aug 4, 5:30 PM EDT	Small Craft Advisory	PHI		4 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2012 Severe Thunderstorm Warnings in New Jersey, 2012 Every severe thunderstorm warning in 2012

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.